chore(release): 2.3.0 [skip ci]

## [2.3.0](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.2.1...v2.3.0) (2025-10-07) ### Features * add Biome + ESLint linting setup ([fc1838f](fc1838f4f5)) ### Styles * apply Biome formatting to entire codebase ([60d70cd](60d70cd2f2))
style: apply Biome formatting to entire codebase
2025-10-07 17:49:19 +00:00 · 2025-10-07 12:48:26 -05:00 · 2025-10-07 12:48:26 -05:00 · 2025-10-07 15:47:29 +00:00 · 2025-10-07 10:46:46 -05:00 · 2025-10-07 15:42:43 +00:00
392 changed files with 64875 additions and 28498 deletions
--- a/.claude/settings.local.json
+++ b/.claude/settings.local.json
@@ -171,9 +171,19 @@
      "Bash(open http://localhost:3002/create)",
      "Bash(open http://localhost:3002/games/complement-race/practice)",
      "Bash(open http://localhost:3002/games/complement-race)",
-      "Bash(npx vitest run:*)"
+      "Bash(npx vitest run:*)",
+      "Bash(sqlite3:*)",
+      "Bash(NODE_ENV=development node server.js)",
+      "Bash(lsof:*)",
+      "Bash(xargs kill:*)",
+      "Bash(./test-arcade-api.sh:*)",
+      "Bash(pkill:*)",
+      "Bash(shasum:*)",
+      "Bash(open http://localhost:3000/arcade/matching)",
+      "Bash(echo:*)",
+      "Bash(npm run type-check:*)"
    ],
    "deny": [],
    "ask": []
  }
-}
+}
--- a/.dockerignore
+++ b/.dockerignore
@@ -1,5 +1,7 @@
 # Ignore development files
+# Ignore all node_modules to prevent Docker overlay conflicts
 node_modules
+**/node_modules
 .next
 .git
 .github
--- a/.github/workflows/deploy-storybook.yml
+++ b/.github/workflows/deploy-storybook.yml
@@ -36,7 +36,7 @@ jobs:
      - name: Setup pnpm
        uses: pnpm/action-setup@v2
        with:
-          version: 8.0.0
+          version: 9.15.4

      - name: Get pnpm store directory
        shell: bash
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -18,7 +18,7 @@ jobs:

    - uses: pnpm/action-setup@v2
      with:
-        version: 8.0.0
+        version: 9.15.4

    - uses: actions/setup-node@v4
      with:
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -32,7 +32,7 @@ jobs:
      - name: Setup pnpm
        uses: pnpm/action-setup@v2
        with:
-          version: 8.0.0
+          version: 9.15.4

      - name: Get pnpm store directory
        shell: bash
--- a/.github/workflows/verify-examples.yml
+++ b/.github/workflows/verify-examples.yml
@@ -46,7 +46,7 @@ jobs:
    
    - name: Upload example images if changed
      if: failure()
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
      with:
        name: updated-examples
        path: docs/images/
--- a/.gitignore
+++ b/.gitignore
@@ -10,6 +10,9 @@ dist/
 # Generated CSS (Panda CSS / styled-system)
 **/styled-system/

+# Generated build info
+**/generated/build-info.json
+
 # Environment
 .env*

@@ -40,6 +43,14 @@ Thumbs.db
 # Test coverage
 coverage/

+# Test reports
+playwright-report/
+
+# Database files
+*.db
+*.db-shm
+*.db-wal
+
 # Temporary files
 tmp/
 temp/
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,351 @@
+## [2.3.0](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.2.1...v2.3.0) (2025-10-07)
+
+
+### Features
+
+* add Biome + ESLint linting setup ([fc1838f](https://github.com/antialias/soroban-abacus-flashcards/commit/fc1838f4f53a4f8d8f1c5303de3a63f12d9c9303))
+
+
+### Styles
+
+* apply Biome formatting to entire codebase ([60d70cd](https://github.com/antialias/soroban-abacus-flashcards/commit/60d70cd2f2f2b1d250c4c645889af4334968cb7e))
+
+## [2.2.1](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.2.0...v2.2.1) (2025-10-07)
+
+
+### Bug Fixes
+
+* remove remaining typst-dependent files ([d1b9b72](https://github.com/antialias/soroban-abacus-flashcards/commit/d1b9b72cfc2f2ba36c40d7ae54bc6fdfcc5f34da))
+
+## [2.2.0](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.1.3...v2.2.0) (2025-10-07)
+
+
+### Features
+
+* remove typst-related code and routes ([be6fb1a](https://github.com/antialias/soroban-abacus-flashcards/commit/be6fb1a881b983f9830d36c079b7b41f35153b8a))
+
+## [2.1.3](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.1.2...v2.1.3) (2025-10-07)
+
+
+### Bug Fixes
+
+* remove .npmrc from Dockerfile COPY ([e71c2b4](https://github.com/antialias/soroban-abacus-flashcards/commit/e71c2b4da85076dfc97401fc170cd88cb0aa4375))
+
+## [2.1.2](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.1.1...v2.1.2) (2025-10-07)
+
+
+### Bug Fixes
+
+* revert to default pnpm mode for Docker compatibility ([bd0092e](https://github.com/antialias/soroban-abacus-flashcards/commit/bd0092e69ac4f74ea89b8d31399cf72f57484cbb))
+
+## [2.1.1](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.1.0...v2.1.1) (2025-10-07)
+
+
+### Bug Fixes
+
+* ignore all node_modules in Docker ([4792dde](https://github.com/antialias/soroban-abacus-flashcards/commit/4792dde1beef9c6cb84a27bc6bb6acfa43919a72))
+
+## [2.1.0](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.0.7...v2.1.0) (2025-10-07)
+
+
+### Features
+
+* remove typst dependencies ([eedce28](https://github.com/antialias/soroban-abacus-flashcards/commit/eedce28572035897001f6b8a08f79beaa2360d44))
+
+## [2.0.7](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.0.6...v2.0.7) (2025-10-07)
+
+
+### Bug Fixes
+
+* preserve workspace node_modules in Docker for hoisted mode ([4f8aaf0](https://github.com/antialias/soroban-abacus-flashcards/commit/4f8aaf04aadda11ce9ec470dec44f78062929e77))
+
+## [2.0.6](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.0.5...v2.0.6) (2025-10-07)
+
+
+### Bug Fixes
+
+* ignore nested node_modules in Docker ([f554592](https://github.com/antialias/soroban-abacus-flashcards/commit/f554592272c2e92d7f1ec6550211518de9c3242f))
+
+## [2.0.5](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.0.4...v2.0.5) (2025-10-07)
+
+
+### Bug Fixes
+
+* use .npmrc in Docker for hoisted mode consistency ([2df8cdc](https://github.com/antialias/soroban-abacus-flashcards/commit/2df8cdc88ed03b6b04642a3441e17c6fda11d2a5))
+
+## [2.0.4](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.0.3...v2.0.4) (2025-10-07)
+
+
+### Bug Fixes
+
+* remove .npmrc in Docker to avoid hoisted mode issues ([2a77d75](https://github.com/antialias/soroban-abacus-flashcards/commit/2a77d755b7820b5b6b52ea99db418e6d071d726e))
+
+## [2.0.3](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.0.2...v2.0.3) (2025-10-07)
+
+
+### Bug Fixes
+
+* remove duplicate PlayerStatusBar story file from arcade ([4e721f7](https://github.com/antialias/soroban-abacus-flashcards/commit/4e721f765a29fe8628d4e34ef94cdf5728eea3dc))
+
+## [2.0.2](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.0.1...v2.0.2) (2025-10-07)
+
+
+### Bug Fixes
+
+* update Dockerfile pnpm version and fix TypeScript config ([43077a8](https://github.com/antialias/soroban-abacus-flashcards/commit/43077a80e271a793c88f100874914ae6f3c515b5))
+
+## [2.0.1](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.0.0...v2.0.1) (2025-10-07)
+
+
+### Bug Fixes
+
+* add @types/minimatch to abacus-react devDependencies ([fa45475](https://github.com/antialias/soroban-abacus-flashcards/commit/fa4547543dcd0cddc7cc9ff9da62f60a4717fb1f))
+
+## [2.0.0](https://github.com/antialias/soroban-abacus-flashcards/compare/v1.2.1...v2.0.0) (2025-10-07)
+
+
+### ⚠ BREAKING CHANGES
+
+* abacus-react package now has independent versioning from monorepo
+
+### Features
+
+* **abacus-react:** add dual publishing to npm and GitHub Packages ([242ee52](https://github.com/antialias/soroban-abacus-flashcards/commit/242ee523edebe2cfc5db27cc72fba0315072bec2))
+* **abacus-react:** comprehensive README overhaul with current capabilities ([0ce351e](https://github.com/antialias/soroban-abacus-flashcards/commit/0ce351e572ac34fa816ee7533a26403c843d93f3))
+* **abacus-react:** configure GitHub Packages-only publishing workflow ([5eeedd9](https://github.com/antialias/soroban-abacus-flashcards/commit/5eeedd9a59a6b3898cadb30c413daa791a9561ee))
+* **abacus-react:** enable dual publishing to npm and GitHub Packages ([176a196](https://github.com/antialias/soroban-abacus-flashcards/commit/176a1961d05f99908a72837cf4e8ec93c0d33145))
+* **abacus-react:** enhance package description with semantic versioning details ([af037b5](https://github.com/antialias/soroban-abacus-flashcards/commit/af037b5e0a1ded5460f95498eb1fb5ac19c2e3fa))
+* **abacus-react:** implement GitHub Packages-only publishing workflow ([b194599](https://github.com/antialias/soroban-abacus-flashcards/commit/b194599f6029015b1aba0e57eb5fe9f83b89d403))
+* **abacus-react:** implement GitHub-only semantic release with manual package publishing ([33b0567](https://github.com/antialias/soroban-abacus-flashcards/commit/33b056769811d1cf1c41dee9e65f6e12188e6f5f))
+* **abacus-react:** simplify to GitHub Packages-only publishing ([acc126b](https://github.com/antialias/soroban-abacus-flashcards/commit/acc126bd5a0f0b2017263593ac2e3a180606f17b))
+* **abacus-react:** update description to mention GitHub Packages support ([af77256](https://github.com/antialias/soroban-abacus-flashcards/commit/af7725622e15801f9e56af12930c4e14c5e67c53))
+* **abacus-react:** use environment variables to override npm registry ([ad444e1](https://github.com/antialias/soroban-abacus-flashcards/commit/ad444e108f76d3014e492ddc94de0e52c61743ea))
+* add API routes for players and user stats ([6f940e2](https://github.com/antialias/soroban-abacus-flashcards/commit/6f940e24d663cc06084a943df4743c2a1c1b3c33))
+* add arcade matching game components and utilities ([ff16303](https://github.com/antialias/soroban-abacus-flashcards/commit/ff16303a7cd2880fcdfd51ef8a744e245905d87d))
+* add arcade room system database schema and managers (Phase 1) ([a9175a0](https://github.com/antialias/soroban-abacus-flashcards/commit/a9175a050c1668a6ba066078e0bdbd944b4eb960))
+* add build info API endpoint ([571664e](https://github.com/antialias/soroban-abacus-flashcards/commit/571664e725b63f22fa9f0bca8a1c518a54441dec))
+* add build info generation script ([416dc89](https://github.com/antialias/soroban-abacus-flashcards/commit/416dc897e26ab93930b52faf77da3a6ffd4a0fb9))
+* add category browsing and scrolling to emoji picker ([616a50e](https://github.com/antialias/soroban-abacus-flashcards/commit/616a50e234f79e271cb0bd9c959866d2d2e5ac82))
+* add complement display options and unify equation display ([2ed7b2c](https://github.com/antialias/soroban-abacus-flashcards/commit/2ed7b2cbf8ad7c18b14c0e86b04a3ba96cc4de0b))
+* add Complement Race game with three unique game modes ([582bce4](https://github.com/antialias/soroban-abacus-flashcards/commit/582bce411f5e89fe1ee677321d06ca7d0fd78701))
+* add comprehensive E2E testing with Playwright ([d58053f](https://github.com/antialias/soroban-abacus-flashcards/commit/d58053fad3ab06b9884b46dbb6807e938426dbb5))
+* add comprehensive Storybook stories for PlayerStatusBar ([8973241](https://github.com/antialias/soroban-abacus-flashcards/commit/8973241297d50604028bde95b9ebbf033688db89))
+* add configuration access to active player emojis in prominent nav ([6049a7f](https://github.com/antialias/soroban-abacus-flashcards/commit/6049a7f6b7481ca42a7907d11d93676549bf6629))
+* add configuration access to fullscreen player selection ([b85968b](https://github.com/antialias/soroban-abacus-flashcards/commit/b85968bcb6afa379d50242185e7743f6fe4ba982))
+* add consecutive match tracking system for escalating celebrations ([111c0ce](https://github.com/antialias/soroban-abacus-flashcards/commit/111c0ced715be7cade006387d01f4e2f52c59be9))
+* add CSS animations and visual feedback system ([80e33e2](https://github.com/antialias/soroban-abacus-flashcards/commit/80e33e25b3d30a44a1a5294997d56949e2aeef8b))
+* add deployment info modal with keyboard shortcut ([43be7ac](https://github.com/antialias/soroban-abacus-flashcards/commit/43be7ac83a9ba3e0ad970f4588729ba2ad394702))
+* add direct URL routes for each game mode ([a08f053](https://github.com/antialias/soroban-abacus-flashcards/commit/a08f0535bf6dfb424e8f9764b37ce6912db6021c))
+* add exitSession to MemoryPairsContextValue interface ([abc2ea5](https://github.com/antialias/soroban-abacus-flashcards/commit/abc2ea50d07e87537ced649bcc9276ef95a3bc4e))
+* add GameControlButtons component with unit tests ([1f45c17](https://github.com/antialias/soroban-abacus-flashcards/commit/1f45c17e0a68db2a452844f87217671223cf7bb0))
+* add guest session system with JWT tokens ([10d8aaf](https://github.com/antialias/soroban-abacus-flashcards/commit/10d8aaf814275a9c3f08e0f1b39970c3ab1a8427))
+* add initialStyle prop to ComplementRaceProvider ([f3bc2f6](https://github.com/antialias/soroban-abacus-flashcards/commit/f3bc2f6d926b9c8d9229636e3ed688bf9ea3baf3))
+* add intelligent on-screen number pad for devices without keyboards ([d4740ff](https://github.com/antialias/soroban-abacus-flashcards/commit/d4740ff99709be915c41f51d973706f6ff2774b3))
+* add interactive remove buttons for players in mini nav ([fa1cf96](https://github.com/antialias/soroban-abacus-flashcards/commit/fa1cf967898bdc396b0bfdcbfe2147a06e189190))
+* add magnifying glass preview on emoji hover ([2c88b6b](https://github.com/antialias/soroban-abacus-flashcards/commit/2c88b6b5f3ba3a47007aa832c2e204bf2ebcc90b))
+* add middleware for pathname header support in [@nav](https://github.com/nav) fallback ([b7e7c4b](https://github.com/antialias/soroban-abacus-flashcards/commit/b7e7c4beff1e37e90e9e20a890c5af7a134a7fca))
+* add mini app nav to arcade page ([a854fe3](https://github.com/antialias/soroban-abacus-flashcards/commit/a854fe3dc935b10db8dc71569c0c8abd81938e4c))
+* add optimistic updates and remove dead code ([b62cf26](https://github.com/antialias/soroban-abacus-flashcards/commit/b62cf26fb6597bae9a590f8b8d630fd31a8dd321))
+* add passenger boarding system with station-based pickup ([23a9016](https://github.com/antialias/soroban-abacus-flashcards/commit/23a9016245e061b65151735db31aebdc9d36ed1d))
+* add player types and migration utilities ([79f44b2](https://github.com/antialias/soroban-abacus-flashcards/commit/79f44b25d6c17f119c3ae225fb449be27c77c56d))
+* add PlayerStatusBar with escalating celebration animations ([7f8c90a](https://github.com/antialias/soroban-abacus-flashcards/commit/7f8c90acea84b208df0e3e23e80a02cf425c0950))
+* add prominent game context display to mini nav with smooth transitions ([8792393](https://github.com/antialias/soroban-abacus-flashcards/commit/8792393956b01a5a8ca67d78209e6defb6a11903))
+* add React Query setup with api helper ([a3878a8](https://github.com/antialias/soroban-abacus-flashcards/commit/a3878a8537fe123fa345d2d2990b3cd76132ba1e))
+* add realistic mountains with peaks and ground terrain ([99cdfa8](https://github.com/antialias/soroban-abacus-flashcards/commit/99cdfa8a0ba63e7b523466d8b2108bca05b0310a))
+* add security tests and userId injection protection ([aa1ad31](https://github.com/antialias/soroban-abacus-flashcards/commit/aa1ad315ef75af5b6833a3a3628a9bbceb80c03c))
+* add server-side validation for player modifications during active arcade sessions ([3b3cad4](https://github.com/antialias/soroban-abacus-flashcards/commit/3b3cad4b769b0ed9ed8e6dc2363bcaf13cc8e08a))
+* add Setup button to exit arcade sessions ([ae1318e](https://github.com/antialias/soroban-abacus-flashcards/commit/ae1318e8bf2c584853ceeb38336d871110f13a39))
+* add smooth spring animations to pressure gauge ([863a2e1](https://github.com/antialias/soroban-abacus-flashcards/commit/863a2e1319448381c853540301886fb4a169e112))
+* add sound settings support to AbacusReact component ([90b9ffa](https://github.com/antialias/soroban-abacus-flashcards/commit/90b9ffa0d8659891bfe8062217e45245bbff5d5a))
+* add train car system with smooth boarding/disembarking animations ([1613912](https://github.com/antialias/soroban-abacus-flashcards/commit/1613912740756d984205e3625791c1d8a2a6fa51))
+* add Web Audio API sound effects system with 16 sound types ([90ba866](https://github.com/antialias/soroban-abacus-flashcards/commit/90ba86640c7062a00d2c7553827a61524ec17da1))
+* **complement-race:** add abacus displays to pressure gauge ([c5ebc63](https://github.com/antialias/soroban-abacus-flashcards/commit/c5ebc635afb6e78f9f4b1192ff39dcec53879a60))
+* complete themed navigation system with game-specific chrome ([0a4bf17](https://github.com/antialias/soroban-abacus-flashcards/commit/0a4bf1765cbd86bf6f67fb3b99c577cfe3cce075))
+* create mode selection landing page for Complement Race ([1ff9695](https://github.com/antialias/soroban-abacus-flashcards/commit/1ff9695f6930f5232b2ad80ddcbd32bbc182d4e7))
+* create PlayerConfigDialog component for player customization ([4f2a661](https://github.com/antialias/soroban-abacus-flashcards/commit/4f2a661494add3f61b714d0bead07b0e0bc3f92d))
+* create StandardGameLayout for perfect viewport sizing ([728a920](https://github.com/antialias/soroban-abacus-flashcards/commit/728a92076a6ac9ef71f0c75d2e9503575881130a))
+* display passengers visually on train and at stations ([1599904](https://github.com/antialias/soroban-abacus-flashcards/commit/159990489fec9162d9ed9ecf77c7592b776bbb23))
+* dynamic player card rendering on games page ([81d17f2](https://github.com/antialias/soroban-abacus-flashcards/commit/81d17f23976cc340e23c63f8e27f1a15afd1a4d0))
+* dynamically calculate train cars based on max concurrent passengers ([9ea1553](https://github.com/antialias/soroban-abacus-flashcards/commit/9ea15535d18efc25739342b0945c6d7ec7896c5d))
+* emit session-state after creating arcade session ([70d6f43](https://github.com/antialias/soroban-abacus-flashcards/commit/70d6f43d6d7ff918ab15edb6e27d4eab8c7a3de6))
+* enable prominent nav and fix layout on arcade page ([5c8c18c](https://github.com/antialias/soroban-abacus-flashcards/commit/5c8c18cbb89da38ccaab3c2ad7081e1a6d45a73e))
+* enhance emoji picker with super powered magnifying glass and hide empty categories ([d8b4e42](https://github.com/antialias/soroban-abacus-flashcards/commit/d8b4e425bf019c593abdcb7693a04e4780b18f06))
+* enhance passenger card UI with boarding status indicators ([4bbdabc](https://github.com/antialias/soroban-abacus-flashcards/commit/4bbdabc3b576ba8cdda5a053878b3f2e9004afca))
+* extend ground terrain to cover entire track area ([ee48417](https://github.com/antialias/soroban-abacus-flashcards/commit/ee48417abfe9f5a2788d6de8ff522f60c13b6066))
+* extend player customization to support all 4 players ([72f8dee](https://github.com/antialias/soroban-abacus-flashcards/commit/72f8dee183b17c88d51748b5131b5a51906a24b3))
+* extend railroad track to viewport edges ([eadd7da](https://github.com/antialias/soroban-abacus-flashcards/commit/eadd7da6dbc4103342dd673f03f97850cdc20f23))
+* extend track and tunnels to absolute viewport edges ([f7419bc](https://github.com/antialias/soroban-abacus-flashcards/commit/f7419bc6a0c03cbe2dbbc095e47891ee67d10b51))
+* implement [@nav](https://github.com/nav) parallel routes for game name display in mini navigation ([885fc72](https://github.com/antialias/soroban-abacus-flashcards/commit/885fc725dc0bb41bbb5e500c2c907c6182192854))
+* implement cozy sound effects for abacus with variable intensity ([c95be1d](https://github.com/antialias/soroban-abacus-flashcards/commit/c95be1df6dbe74aad08b9a1feb1f33688212be0b))
+* implement cozy sound effects for abacus with variable intensity ([cea5fad](https://github.com/antialias/soroban-abacus-flashcards/commit/cea5fadbe4b4d5ae9e0ee988e9b1c4db09f21ba6))
+* implement game control callbacks in MemoryPairsGame ([4758ad2](https://github.com/antialias/soroban-abacus-flashcards/commit/4758ad2f266ef3f3f67c22533fbb5f475dd8bd5b))
+* implement game theming system with context-based navigation chrome ([3fa11c4](https://github.com/antialias/soroban-abacus-flashcards/commit/3fa11c4fbcbeabeb3bdd0db38374fb9a13cbb754))
+* implement innovative dynamic two-panel layout for on-screen keyboard ([4bb8f6d](https://github.com/antialias/soroban-abacus-flashcards/commit/4bb8f6daf1f3eecb5cbaf31bf4057f43e43aeb07))
+* implement mobile-first responsive design for speed memory quiz ([13efc4d](https://github.com/antialias/soroban-abacus-flashcards/commit/13efc4d0705bb9e71a2002689a4ebac109caacc2))
+* implement simple fixed bottom keyboard bar ([9ef72d7](https://github.com/antialias/soroban-abacus-flashcards/commit/9ef72d7e88a6a9b30cfd7a7d3944197cc1e0037a))
+* implement smooth train exit with fade-out through right tunnel ([0176694](https://github.com/antialias/soroban-abacus-flashcards/commit/01766944f0267b1f2adeb6a30c9f89d48038a7f8))
+* implement toggleable on-screen keyboard to prevent UI overlap ([701d23c](https://github.com/antialias/soroban-abacus-flashcards/commit/701d23c36992b09c075e1a394f8a72edffb919f9))
+* improve game availability logic and messaging ([9a3fa93](https://github.com/antialias/soroban-abacus-flashcards/commit/9a3fa93e53d05475844b54052acbc838d7487d23))
+* increase landmark emoji size for better visibility ([0bcd7a3](https://github.com/antialias/soroban-abacus-flashcards/commit/0bcd7a30d42a0a0d5bdfcf5abd8eb3eb9a8b6a73))
+* integrate GameControlButtons into navigation ([fbd8cd4](https://github.com/antialias/soroban-abacus-flashcards/commit/fbd8cd4a6bca44bbc0f7c4e8153900558805a84a))
+* integrate remaining game sound effects ([600bc35](https://github.com/antialias/soroban-abacus-flashcards/commit/600bc35bc3111a455290638e7be31d0032ff656c))
+* integrate sound effects into game flow (countdown, answers, performance) ([8c3a855](https://github.com/antialias/soroban-abacus-flashcards/commit/8c3a85523930fca7f2dcc53c79454fb9be523d55))
+* integrate user profiles with PlayerStatusBar and game results ([beff646](https://github.com/antialias/soroban-abacus-flashcards/commit/beff64652c72a5cd0c008891b6dc2f5167e28b62))
+* make Steam Sprint infinite mode ([32c3a35](https://github.com/antialias/soroban-abacus-flashcards/commit/32c3a35eabd10f8c9b50a55cfb525a76ea050914))
+* make SVG span full viewport width for sprint mode ([7488bb3](https://github.com/antialias/soroban-abacus-flashcards/commit/7488bb38033b2d3d3fc18b9f09373506d69e25a5))
+* migrate abacus display settings to database ([92ef136](https://github.com/antialias/soroban-abacus-flashcards/commit/92ef1360a4792d0b36f3a35e100bd9f3c7451656))
+* migrate contexts to React Query (remove localStorage) ([fe01a1f](https://github.com/antialias/soroban-abacus-flashcards/commit/fe01a1fe182293aeadd5cbfd73f0a54a858ae38e))
+* migrate contexts to UUID-based player system ([2b94cad](https://github.com/antialias/soroban-abacus-flashcards/commit/2b94cad11bd05b1a324e360c56be686c3c6a4b64))
+* preserve track and passengers during route transitions ([f2e7165](https://github.com/antialias/soroban-abacus-flashcards/commit/f2e71657dc1587c2b6df1f4227160b8a261c6084))
+* redesign passenger cards with vintage train station aesthetic ([651bc21](https://github.com/antialias/soroban-abacus-flashcards/commit/651bc2158361fbaafb0b011ab90006b21d3a7c85))
+* set up automated npm publishing for @soroban/abacus-react package ([dd80d29](https://github.com/antialias/soroban-abacus-flashcards/commit/dd80d29c979e20b4d3624cf66be79ec51d5f53a9))
+* set up Drizzle ORM with SQLite database ([5d5afd4](https://github.com/antialias/soroban-abacus-flashcards/commit/5d5afd4e6860241ff45c7173d4aad2b7156a41b1))
+* skip countdown for train mode (sprint) ([65dafc9](https://github.com/antialias/soroban-abacus-flashcards/commit/65dafc92153399336f200a566bc91f869fdfcbb1))
+* skip intro screen and start directly at game setup ([4b6888a](https://github.com/antialias/soroban-abacus-flashcards/commit/4b6888af05c6be9616cf20b9d2b8b66ac13cf253))
+* sync URL with selected game mode ([3920bba](https://github.com/antialias/soroban-abacus-flashcards/commit/3920bbad33ef5dd6323d2baea498943f5115dbec))
+* UI polish for Sprint mode (viewport, backgrounds, data attributes) ([90ad789](https://github.com/antialias/soroban-abacus-flashcards/commit/90ad789ff1f94f52b98de9fd934a623eab452387))
+* update nav components for UUID players ([e85d041](https://github.com/antialias/soroban-abacus-flashcards/commit/e85d0415f23049da861533bbec2a65e1d84adfe1))
+* use CSS transitions for smooth fullscreen player selection collapse ([3189832](https://github.com/antialias/soroban-abacus-flashcards/commit/31898328a391614a0fe8d24ec9d2881bfb6e6984))
+* wire player configuration through nav component hierarchy ([edfdd81](https://github.com/antialias/soroban-abacus-flashcards/commit/edfdd8122774e36dbda9acea741a5e248be95676))
+
+
+### Bug Fixes
+
+* **abacus-react:** add debugging and explicit authentication for npm publish ([b82e9bb](https://github.com/antialias/soroban-abacus-flashcards/commit/b82e9bb9d6adf3793065067f96c6fbbfd1a78bca))
+* **abacus-react:** add packages: write permission for GitHub Packages publishing ([8e16487](https://github.com/antialias/soroban-abacus-flashcards/commit/8e1648737de9305f82872cb9b86b98b5045f77a7))
+* **abacus-react:** apply global columnPosts styling and fix reckoning bar width ([bb9959f](https://github.com/antialias/soroban-abacus-flashcards/commit/bb9959f7fb8985e0c6496247306838d97e7121f7))
+* **abacus-react:** force npm to use GitHub Packages registry ([5e6c901](https://github.com/antialias/soroban-abacus-flashcards/commit/5e6c901f73a68b60ec05f19c4a991ca8affc1589))
+* **abacus-react:** improve publishing workflow with better version sync ([7a4ecd2](https://github.com/antialias/soroban-abacus-flashcards/commit/7a4ecd2b5970ed8b6bfde8938b36917f8e7a7176))
+* **abacus-react:** improve workspace dependency cleanup and add validation ([11fd6f9](https://github.com/antialias/soroban-abacus-flashcards/commit/11fd6f9b3deb1122d3788a7e0698de891eeb0f3a))
+* **abacus-react:** resolve workspace dependencies before npm publish ([834b062](https://github.com/antialias/soroban-abacus-flashcards/commit/834b062b2d22356b9d96bb9c3c444eccaa51d793))
+* **abacus-react:** simplify semantic-release config to resolve dependency issues ([88cab38](https://github.com/antialias/soroban-abacus-flashcards/commit/88cab380ef383c941b41671d58d3e35fcaefb2d3))
+* **abacus-react:** temporarily allow test failures during setup phase ([e3db7f4](https://github.com/antialias/soroban-abacus-flashcards/commit/e3db7f4daf16fce82bccfe47dcaa90d7f4896a79))
+* add CLEAR_MISMATCH move to allow mismatch feedback to auto-dismiss ([158f527](https://github.com/antialias/soroban-abacus-flashcards/commit/158f52773d20dfab7dc55575d9999f32b4c589a2))
+* add missing GameThemeContext file for themed navigation ([d4fbdd1](https://github.com/antialias/soroban-abacus-flashcards/commit/d4fbdd14630e2f2fcdbc0de23ccc4ccd9eb74b48))
+* add npmrc for hoisting and fix template paths ([5c65ac5](https://github.com/antialias/soroban-abacus-flashcards/commit/5c65ac5caabb7197f069344d0ed29d02c3de2b9a))
+* add Python setuptools and build tools for better-sqlite3 compilation ([a216a3d](https://github.com/antialias/soroban-abacus-flashcards/commit/a216a3d3435a132c8add0a7c711b021bf4b1555f))
+* add testing mode for on-screen keyboard and fix toggle functionality ([904074c](https://github.com/antialias/soroban-abacus-flashcards/commit/904074ca821b62cd6b1e129354eb36c5dd4b5e7f))
+* align all bottom UI elements to same 20px baseline ([076c97a](https://github.com/antialias/soroban-abacus-flashcards/commit/076c97abac7a33f600b80083d8990a8c4a51be99))
+* align bottom-positioned UI elements ([227cfab](https://github.com/antialias/soroban-abacus-flashcards/commit/227cfabf113bc875ea3a61f0de41a9093ad1dd30))
+* allow navigation to game setup pages without active session ([c7ad3c0](https://github.com/antialias/soroban-abacus-flashcards/commit/c7ad3c069502580d1e72e7cc01e7b1f793ba9357))
+* change pressure gauge to fixed positioning to stay above terrain ([1b11031](https://github.com/antialias/soroban-abacus-flashcards/commit/1b110315982f631dadca96a37fc88db98a7f9cca))
+* change question display to fixed positioning with higher z-index ([4ac8758](https://github.com/antialias/soroban-abacus-flashcards/commit/4ac875895781dba5e115eeb3336ef76744b782bb))
+* **complement-race:** improve abacus display in equations ([491b299](https://github.com/antialias/soroban-abacus-flashcards/commit/491b299e28ee82c49069cf892609b1b2b3c0aee3))
+* **complement-race:** prevent passengers being left behind at delivery stations ([e6ebecb](https://github.com/antialias/soroban-abacus-flashcards/commit/e6ebecb09b1e5dd78c2dc11e125399082fb420ab))
+* correct emoji category group IDs to match Unicode CLDR ([b2a21b7](https://github.com/antialias/soroban-abacus-flashcards/commit/b2a21b79ad705a5b52767317af00e4d666d33907))
+* defer URL update until game starts ([12c54b2](https://github.com/antialias/soroban-abacus-flashcards/commit/12c54b27b717e852b96585eacdf6e9d964e32c50))
+* delay passenger display update until train resets ([e06a750](https://github.com/antialias/soroban-abacus-flashcards/commit/e06a7504549bb4e0fcc38bd03249b9c0386c3079))
+* disable turn validation in arcade mode matching game ([7c0e6b1](https://github.com/antialias/soroban-abacus-flashcards/commit/7c0e6b142b90f0fc3d444b3dcc1fff1512a0a3b2))
+* eliminate rail jaggies on sharp curves by increasing sampling density ([46d4af2](https://github.com/antialias/soroban-abacus-flashcards/commit/46d4af2bdad761366890171cc666ba24d5309257))
+* enable shamefully-hoist for semantic-release dependencies ([6168c29](https://github.com/antialias/soroban-abacus-flashcards/commit/6168c292d5f15748e80610103a6a787c0cf29d0f))
+* enforce playerId must be explicitly provided in arcade moves ([d5a8a2a](https://github.com/antialias/soroban-abacus-flashcards/commit/d5a8a2a14cb14ecd00827ddc96873f3db79573fd))
+* ensure consistent r×c grid layout for memory matching game ([f1a0633](https://github.com/antialias/soroban-abacus-flashcards/commit/f1a0633596fd1bb53418e56e28f3f27d3fce8b54))
+* ensure game names persist in navigation on page reload ([9191b12](https://github.com/antialias/soroban-abacus-flashcards/commit/9191b124934b9a5577a91f67e8fb6f83b173cc4f))
+* ensure passengers only travel forward on train route ([8ad3144](https://github.com/antialias/soroban-abacus-flashcards/commit/8ad3144d2da9b4ceedd62a9f379f664fa9381afe))
+* export missing hooks and types from @soroban/abacus-react package ([423ba55](https://github.com/antialias/soroban-abacus-flashcards/commit/423ba5535023928f1e0198b2bd01c3c6cf7ee848))
+* implement route-based theme detection for page reload persistence ([3dcff2f](https://github.com/antialias/soroban-abacus-flashcards/commit/3dcff2ff888558d7b746a732cfd53a1897c2b1df))
+* improve navigation chrome background color extraction from gradients ([00bfcbc](https://github.com/antialias/soroban-abacus-flashcards/commit/00bfcbcdee28d63094c09a4ae0359789ebcf4a22))
+* increase question display zIndex to stay above terrain ([8c8b8e0](https://github.com/antialias/soroban-abacus-flashcards/commit/8c8b8e08b4d51e6462d4b7dd258a25e64bf16dba))
+* lazy-load database connection to prevent build-time access ([af8d993](https://github.com/antialias/soroban-abacus-flashcards/commit/af8d9936285c697ff45700115eba83b5debdf9ad))
+* make results screen compact to fit viewport without scrolling ([9d4cba0](https://github.com/antialias/soroban-abacus-flashcards/commit/9d4cba05be84e7c162d706c8697eede23314b1a4))
+* migrate viewport from metadata to separate viewport export ([1fe12c4](https://github.com/antialias/soroban-abacus-flashcards/commit/1fe12c4837b1229d0f0ab93c55d0ffb504eb8721))
+* move auth.ts to src/ to match @/ path alias ([7829d8a](https://github.com/antialias/soroban-abacus-flashcards/commit/7829d8a0fb86dac07aa1b2fb0b68908e7e8381b8))
+* move fontWeight to style object for station names ([05a3ddb](https://github.com/antialias/soroban-abacus-flashcards/commit/05a3ddb086e28529efb321943f4e423dbe5ed6a6))
+* only show configuration gear icon for players 1 and 2 ([d0a3bc7](https://github.com/antialias/soroban-abacus-flashcards/commit/d0a3bc7dc1efc00c1db63fb50bc2ab3c6aabdd59))
+* pass player IDs (not user IDs) in all arcade game moves ([d00abd2](https://github.com/antialias/soroban-abacus-flashcards/commit/d00abd25e755c0304517a7953cb78022a073b7c3))
+* passengers now board/disembark based on their car position, not locomotive ([96782b0](https://github.com/antialias/soroban-abacus-flashcards/commit/96782b0e7a6d0db5a4435ca303b1d819947ce460))
+* position tunnels at absolute viewBox edges ([1a5fa28](https://github.com/antialias/soroban-abacus-flashcards/commit/1a5fa2873bcda9a24cc578a7ecea43632077a0a1))
+* prevent layout shift when selecting Steam Sprint mode ([73a5974](https://github.com/antialias/soroban-abacus-flashcards/commit/73a59745a5145b734b0893a489c5d018e3c9475c))
+* prevent multiple passengers from boarding same car in single frame ([63b0b55](https://github.com/antialias/soroban-abacus-flashcards/commit/63b0b552a89a1165137de125bf57246a7cf6ac73))
+* prevent premature passenger display during route transitions ([fe9ea67](https://github.com/antialias/soroban-abacus-flashcards/commit/fe9ea67f56847859b4fb4fa4f747022f0a2e5a70))
+* prevent random passenger repopulation during route transitions ([db56ce8](https://github.com/antialias/soroban-abacus-flashcards/commit/db56ce89ee1d4e7583b60cde4e1d2610ee31123a))
+* prevent route celebration from immediately reappearing ([1a80934](https://github.com/antialias/soroban-abacus-flashcards/commit/1a8093416e0feff774b6cdc6dfafdbafbb8baf7f))
+* redesign matching game setup page for StandardGameLayout ([cc1f27f](https://github.com/antialias/soroban-abacus-flashcards/commit/cc1f27f0f82256f9344531814e8b965fa547d555))
+* reduce landmark size from 4.0x to 2.0x multiplier ([c928e90](https://github.com/antialias/soroban-abacus-flashcards/commit/c928e907854e18264266958d813d4e1d4c03e760))
+* regenerate lockfile with correct dependency order ([51bf448](https://github.com/antialias/soroban-abacus-flashcards/commit/51bf448c9f159152e89296d9014dde688fcf3a97))
+* regenerate lockfile with node-linker=hoisted from scratch ([480960c](https://github.com/antialias/soroban-abacus-flashcards/commit/480960c2c8e0c50fe2b6ec69a34b772751a8bf41))
+* regenerate pnpm lockfile for pnpm 9 compatibility ([4ab1aef](https://github.com/antialias/soroban-abacus-flashcards/commit/4ab1aef9b8fcf15cc03e86c829ca9885e7201b77))
+* remove double PageWithNav wrapper on matching page ([b58bcd9](https://github.com/antialias/soroban-abacus-flashcards/commit/b58bcd92ee0521a6413f4d6e9656c9ccb1c72851))
+* remove duplicate CAR_SPACING and MAX_CARS declarations ([e704a28](https://github.com/antialias/soroban-abacus-flashcards/commit/e704a28524e1217b6f56ca5a51784db73f5eadce))
+* remove duplicate previousPassengersRef declaration ([fad8636](https://github.com/antialias/soroban-abacus-flashcards/commit/fad86367638b1a48b7e1544976148f43b061c832))
+* remove frozen lockfile flag from publishing workflow to resolve dependency installation issues ([18af973](https://github.com/antialias/soroban-abacus-flashcards/commit/18af9730ffbcd822da292161815ffd09ad97f66c))
+* remove hard-coded car count from game loop ([6c90a68](https://github.com/antialias/soroban-abacus-flashcards/commit/6c90a68c49b5f7fbc262c38f9a8828f5c725cb6a))
+* remove unnecessary zIndex from question display ([db52e14](https://github.com/antialias/soroban-abacus-flashcards/commit/db52e14dfe9aceaaa1f98fc79100c04adc84611a))
+* reposition on-screen keyboard to avoid covering abacus tiles ([6e5b4ec](https://github.com/antialias/soroban-abacus-flashcards/commit/6e5b4ec7bf7e2af5f724628693d3c4ee8c5b3968))
+* require activePlayers in START_GAME, never fallback to userId ([ea1b1a2](https://github.com/antialias/soroban-abacus-flashcards/commit/ea1b1a2f69a35a6a27f7f952971509b2bb2e6f8d))
+* reset momentum and pressure when starting new route ([3ea88d7](https://github.com/antialias/soroban-abacus-flashcards/commit/3ea88d7a5a6ed427b17cf408d993918870b75f7f))
+* resolve circular dependency errors in memory quiz on-screen keyboard ([d25e2c4](https://github.com/antialias/soroban-abacus-flashcards/commit/d25e2c4c006b54a51eaa3a93fa8462e3a06221b7))
+* resolve JSX parsing error with emoji in guide page ([bf046c9](https://github.com/antialias/soroban-abacus-flashcards/commit/bf046c999b51ba422284a139ebadde2c35187ac7))
+* resolve mini navigation game name persistence across all routes ([3fa314a](https://github.com/antialias/soroban-abacus-flashcards/commit/3fa314aaa5de7b9c26a5390a52996c7d5ef9ea51))
+* resolve runtime error - calculateOptimalGrid not defined ([fbc84fe](https://github.com/antialias/soroban-abacus-flashcards/commit/fbc84febda5507d434cf60aa0fce32350e01ec96))
+* resolve SSR/client hydration mismatch for themed navigation ([301e65d](https://github.com/antialias/soroban-abacus-flashcards/commit/301e65dfa66d0de6b6efbbfbd09b717308ab57f1))
+* resolve TypeScript errors in PlayerStatusBar component ([a935e5a](https://github.com/antialias/soroban-abacus-flashcards/commit/a935e5aed8c4584d21c8fc4359453b7dec494464))
+* restore navigation to all pages using PageWithNav ([183706d](https://github.com/antialias/soroban-abacus-flashcards/commit/183706dade12080a748b0c074d0bd71fb0471d7e))
+* show "Return to Arcade" button only during active game ([4153929](https://github.com/antialias/soroban-abacus-flashcards/commit/4153929a2ab199836249d53d92c1be4979782b73))
+* smooth rail curves and deterministic track generation ([4f79c08](https://github.com/antialias/soroban-abacus-flashcards/commit/4f79c08d73c090165a1c419e7aa8ef543bc23e7e))
+* stabilize route completion threshold to prevent stuck trains ([b7233f9](https://github.com/antialias/soroban-abacus-flashcards/commit/b7233f9e4afe1dadfe29ecc4430c74074a2674fc))
+* update lockfile and fix Makefile paths ([7ba746b](https://github.com/antialias/soroban-abacus-flashcards/commit/7ba746b6bdcc4c06172e1dbacd856da9416e010a))
+* update matching game for UUID player system ([2e041dd](https://github.com/antialias/soroban-abacus-flashcards/commit/2e041ddc4443be1d032139ad9850bbc28db5c171))
+* update memory pairs game to use StandardGameLayout ([8df76c0](https://github.com/antialias/soroban-abacus-flashcards/commit/8df76c08fdf4108b88ce95de252cb8bd559fc5e4))
+* update memory quiz to use StandardGameLayout ([3f86163](https://github.com/antialias/soroban-abacus-flashcards/commit/3f86163c142e577a64adfb3bf262656d2e100ced))
+* update pnpm version to 8.15.6 to resolve ERR_INVALID_THIS error in workflow ([0b9bfed](https://github.com/antialias/soroban-abacus-flashcards/commit/0b9bfed12dfd48d9eacae69b378e28e188d3f2b1))
+* update race track components for new player system ([ae4e8fc](https://github.com/antialias/soroban-abacus-flashcards/commit/ae4e8fcb5a62c07fb9ffa9a70c07e45ca8be88c8))
+* update tutorial tests to use consolidated AbacusDisplayProvider ([899fc69](https://github.com/antialias/soroban-abacus-flashcards/commit/899fc6975f1fa14ddb42b2ead03524c9389e7c38))
+* update workflow to support Personal Access Token for GitHub Packages publishing auth ([ae4b71b](https://github.com/antialias/soroban-abacus-flashcards/commit/ae4b71b98655364887a729ef9d2b67b6a753d6e9))
+* upgrade CI dependencies and fix deprecated actions ([6a51c1e](https://github.com/antialias/soroban-abacus-flashcards/commit/6a51c1e9bdc299d86b8001eba35f930fe16cd60c))
+* use displayPassengers for station rendering in RailroadTrackPath ([a9e0d19](https://github.com/antialias/soroban-abacus-flashcards/commit/a9e0d197348377cb66581150df47d2d1127ad09a))
+* use node-linker=hoisted for full dependency hoisting ([d3b2e0b](https://github.com/antialias/soroban-abacus-flashcards/commit/d3b2e0b2e152150886110edd80dfe43f70df63d9))
+* use player IDs instead of array indices in matching game ([ccd0d6d](https://github.com/antialias/soroban-abacus-flashcards/commit/ccd0d6d94ccd1cc25eed602d32a9cf884bda2ee6))
+* use style fontSize instead of attribute for landmarks ([ebc6894](https://github.com/antialias/soroban-abacus-flashcards/commit/ebc6894746d1d490c3a5cae19c38bb86fe8fdc65))
+* use UUID player IDs in session creation fallback ([22541df](https://github.com/antialias/soroban-abacus-flashcards/commit/22541df99f049ce99e020e12c2d28b33434de51d))
+* wrap animated pressure value in animated.span to prevent React error ([5c5954b](https://github.com/antialias/soroban-abacus-flashcards/commit/5c5954be74708fb7019802a6dd80b10e9b2c1d6a))
+
+
+### Performance Improvements
+
+* optimize React rendering with memoization and consolidated effects ([93cb070](https://github.com/antialias/soroban-abacus-flashcards/commit/93cb070ca503effa05541f7ed217bb4260359581))
+
+
+### Code Refactoring
+
+* completely remove [@nav](https://github.com/nav) parallel routes and simplify navigation ([54ff20c](https://github.com/antialias/soroban-abacus-flashcards/commit/54ff20c7555e028b50471ac83a7030921c76f43b))
+* consolidate abacus display context management ([a387b03](https://github.com/antialias/soroban-abacus-flashcards/commit/a387b030fa9fe36f2c8c0e65e34ec9ee872a7afa))
+* extract ActivePlayersList component from PageWithNav ([2849576](https://github.com/antialias/soroban-abacus-flashcards/commit/28495767a9b792e6f8b9cc9f4df85e1b27a15c35))
+* extract AddPlayerButton component from PageWithNav ([57a72e3](https://github.com/antialias/soroban-abacus-flashcards/commit/57a72e34a5df198ac795ff83cb6bfc6fb8a2f27e))
+* extract FullscreenPlayerSelection component from PageWithNav ([66f5223](https://github.com/antialias/soroban-abacus-flashcards/commit/66f52234e12594947069c4ffed3648ce034c3e79))
+* extract GameContextNav orchestration component ([e3f552d](https://github.com/antialias/soroban-abacus-flashcards/commit/e3f552d8f588b25d13eca20fbcd4f43b30de917f))
+* extract GameHUD component from SteamTrainJourney ([78d5234](https://github.com/antialias/soroban-abacus-flashcards/commit/78d5234a79eb5293ae8eb279fb46b5aa2bbb6ae7))
+* extract GameModeIndicator component from PageWithNav ([d67315f](https://github.com/antialias/soroban-abacus-flashcards/commit/d67315f771a3f660be58495c1236f74b49001d23))
+* extract guide components to fix syntax error in large file ([c77e880](https://github.com/antialias/soroban-abacus-flashcards/commit/c77e880be32456c1e91d37358d85c445b2f707df))
+* extract RailroadTrackPath component from SteamTrainJourney ([d9acc0e](https://github.com/antialias/soroban-abacus-flashcards/commit/d9acc0efea397ce58013160efbb2ed4fbee244b2))
+* extract TrainAndCars component from SteamTrainJourney ([5ae22e4](https://github.com/antialias/soroban-abacus-flashcards/commit/5ae22e4645614bc67e7dece509d92bdd85250e28))
+* extract TrainTerrainBackground component from SteamTrainJourney ([05bb035](https://github.com/antialias/soroban-abacus-flashcards/commit/05bb035db5483892f101cef0971bf08575cb041b))
+* extract usePassengerAnimations hook from SteamTrainJourney ([32abde1](https://github.com/antialias/soroban-abacus-flashcards/commit/32abde107ca050bfc191a325d0bf074d53df33fc))
+* extract useTrackManagement hook from SteamTrainJourney ([a1f2b97](https://github.com/antialias/soroban-abacus-flashcards/commit/a1f2b9736a0ff087dae44110708254e6da966b79))
+* extract useTrainTransforms hook from SteamTrainJourney ([a2512d5](https://github.com/antialias/soroban-abacus-flashcards/commit/a2512d573823e187aad08f3fed365c4211023bb3))
+* make game mode a computed property from active player count ([386c88a](https://github.com/antialias/soroban-abacus-flashcards/commit/386c88a3c03eb6de7814f65a6556a2d0ab50386b))
+* remove drag-and-drop UI from EnhancedChampionArena ([982fa45](https://github.com/antialias/soroban-abacus-flashcards/commit/982fa45c08b34fdb64ec0835bc591b850e1c1373))
+* remove duplicate game control buttons from game phases ([9165014](https://github.com/antialias/soroban-abacus-flashcards/commit/9165014997ccf6f4859646709d7e800933b4868e))
+* remove redundant game titles from game screens ([402724c](https://github.com/antialias/soroban-abacus-flashcards/commit/402724c80e1776b90be1fc02186813389560f380))
+* replace bulky MemoryGrid stats with compact progress display ([c4d6691](https://github.com/antialias/soroban-abacus-flashcards/commit/c4d6691715d09066661be4a0af7e917c6217ed8c))
+* simplify navigation flow and enhance GameControls UI ([920aaa6](https://github.com/antialias/soroban-abacus-flashcards/commit/920aaa639887b42dcb225cb42ce146e67d29a98e))
+* simplify PageWithNav by extracting nav components ([98cfa56](https://github.com/antialias/soroban-abacus-flashcards/commit/98cfa5645bc21faaeffa676d205bdbdf604eb488))
+* split deployment info into server/client components ([5e7b273](https://github.com/antialias/soroban-abacus-flashcards/commit/5e7b273b339cd11d7b4b55dd50a1bf6c823b41d5))
+* streamline GamePhase header and integrate PlayerStatusBar ([dcefa74](https://github.com/antialias/soroban-abacus-flashcards/commit/dcefa74902c65618f79eda32c94a5b8736b15b55))
+* streamline UI and remove duplicate information displays ([7a3e34b](https://github.com/antialias/soroban-abacus-flashcards/commit/7a3e34b4faab62c069e6698a935ad66ee80037d2))
+
+
+### Documentation
+
+* add comprehensive workflow documentation for automated npm publishing ([f923b53](https://github.com/antialias/soroban-abacus-flashcards/commit/f923b53a44c2875fe152c9bd326d6a427d07a71e))
+* add server persistence migration plan ([dd0df8c](https://github.com/antialias/soroban-abacus-flashcards/commit/dd0df8c274f513947e43f014b9086f77077f0196))
+
+
+### Tests
+
+* add comprehensive unit tests for refactored hooks and components ([5d20839](https://github.com/antialias/soroban-abacus-flashcards/commit/5d2083903e9eb751d810921e06dc51b7137f726f))
+* add E2E tests for arcade modal session behavior ([619be98](https://github.com/antialias/soroban-abacus-flashcards/commit/619be9859c548b6c3f0af45379a61f690bcb8e13))
+
 ## [1.2.1](https://github.com/antialias/soroban-abacus-flashcards/compare/v1.2.0...v1.2.1) (2025-09-28)


--- a/7
+++ b/7
@@ -1,8 +1,11 @@
 # Multi-stage build for Soroban Abacus Flashcards
 FROM node:18-alpine AS base

+# Install Python and build tools for better-sqlite3
+RUN apk add --no-cache python3 py3-setuptools make g++
+
 # Install pnpm and turbo
-RUN npm install -g pnpm@8.0.0 turbo@1.10.0
+RUN npm install -g pnpm@9.15.4 turbo@1.10.0

 WORKDIR /app

@@ -14,7 +17,7 @@ COPY packages/core/client/typescript/package.json ./packages/core/client/typescr
 COPY packages/abacus-react/package.json ./packages/abacus-react/
 COPY packages/templates/package.json ./packages/templates/

-# Install dependencies
+# Install dependencies (will use .npmrc with hoisted mode)
 RUN pnpm install --frozen-lockfile

 # Builder stage
--- a/14
+++ b/14
@@ -19,7 +19,7 @@ install:
 # Generate default flashcards
 out/flashcards.pdf: check-deps
 	@mkdir -p out
-	python3 src/generate.py --config config/default.yaml --output out/flashcards.pdf
+	python3 packages/core/src/generate.py --config config/default.yaml --output out/flashcards.pdf

 # Generate linearized version
 out/flashcards_linear.pdf: out/flashcards.pdf
@@ -29,23 +29,23 @@ out/flashcards_linear.pdf: out/flashcards.pdf
 samples: check-deps
 	@echo "Generating sample outputs..."
 	@mkdir -p out/samples
-	python3 src/generate.py --config config/default.yaml --output out/samples/default.pdf
-	python3 src/generate.py --config config/0-99.yaml --output out/samples/0-99.pdf
-	python3 src/generate.py --config config/3-column-fixed.yaml --output out/samples/3-column-fixed.pdf
-	python3 src/generate.py --range "1,2,5,10,20,50,100" --cards-per-page 8 --output out/samples/custom-list.pdf
+	python3 packages/core/src/generate.py --config config/default.yaml --output out/samples/default.pdf
+	python3 packages/core/src/generate.py --config config/0-99.yaml --output out/samples/0-99.pdf
+	python3 packages/core/src/generate.py --config config/3-column-fixed.yaml --output out/samples/3-column-fixed.pdf
+	python3 packages/core/src/generate.py --range "1,2,5,10,20,50,100" --cards-per-page 8 --output out/samples/custom-list.pdf
 	@echo "Sample PDFs generated in out/samples/"

 # Quick test with small range
 test: check-deps
 	@echo "Running quick test..."
-	python3 src/generate.py --range "0-9" --output out/test.pdf
+	python3 packages/core/src/generate.py --range "0-9" --output out/test.pdf
 	@command -v qpdf >/dev/null 2>&1 && qpdf --check out/test.pdf || echo "PDF generated (validation skipped)"
 	@echo "Test completed successfully"

 # Generate README example images
 examples: check-deps
 	@echo "Generating example images for README..."
-	@python3 src/generate_examples.py
+	@python3 packages/core/src/generate_examples.py
 	@echo "✓ Example images generated in docs/images/"

 # Verify examples are up to date (for CI)
--- a/apps/web/.claude/settings.local.json
+++ b/apps/web/.claude/settings.local.json
@@ -0,0 +1,38 @@
+{
+  "permissions": {
+    "allow": [
+      "Bash(npm run build:*)",
+      "Bash(npx tsc:*)",
+      "Bash(curl:*)",
+      "Bash(git add:*)",
+      "Bash(git commit -m \"$(cat <<''EOF''\nfix: lazy-load database connection to prevent build-time access\n\nRefactor db/index.ts to use lazy initialization via Proxy pattern.\nThis prevents the database from being accessed at module import time,\nwhich was causing Next.js build failures in CI/CD environments where\nno database file exists.\n\nThe database connection is now created only when first accessed at\nruntime, allowing static site generation to complete successfully.\n\n🤖 Generated with [Claude Code](https://claude.com/claude-code)\n\nCo-Authored-By: Claude <noreply@anthropic.com>\nEOF\n)\")",
+      "Bash(git push:*)",
+      "Read(//Users/antialias/projects/soroban-abacus-flashcards/**)",
+      "Bash(npm install:*)",
+      "Bash(cat:*)",
+      "Bash(pnpm add:*)",
+      "Bash(npx biome check:*)",
+      "Bash(npx:*)",
+      "Bash(eslint:*)",
+      "Bash(npm run lint:fix:*)",
+      "Bash(npm run format:*)",
+      "Bash(npm run lint:*)",
+      "Bash(pnpm install:*)",
+      "Bash(pnpm run:*)",
+      "Bash(rm:*)",
+      "Bash(lsof:*)",
+      "Bash(xargs kill:*)",
+      "Bash(tee:*)",
+      "Bash(for file in src/app/arcade/complement-race/components/RaceTrack/CircularTrack.tsx src/app/arcade/complement-race/components/RaceTrack/LinearTrack.tsx src/app/games/complement-race/components/RaceTrack/CircularTrack.tsx src/app/games/complement-race/components/RaceTrack/LinearTrack.tsx)",
+      "Bash(do)",
+      "Bash(done)",
+      "Bash(for file in src/app/arcade/complement-race/components/RaceTrack/SteamTrainJourney.tsx src/app/games/complement-race/components/RaceTrack/SteamTrainJourney.tsx)",
+      "Bash(for file in src/app/arcade/complement-race/hooks/useTrackManagement.ts src/app/games/complement-race/hooks/useTrackManagement.ts)",
+      "Bash(echo \"EXIT CODE: $?\")",
+      "Bash(git commit -m \"$(cat <<''EOF''\nfeat: add Biome + ESLint linting setup\n\nAdd Biome for formatting and general linting, with minimal ESLint\nconfiguration for React Hooks rules only. This provides:\n\n- Fast formatting via Biome (10-100x faster than Prettier)\n- General JS/TS linting via Biome\n- React Hooks validation via ESLint (rules-of-hooks)\n- Import organization via Biome\n\nConfiguration files:\n- biome.jsonc: Biome config with custom rule overrides\n- eslint.config.js: Minimal flat config for React Hooks only\n- .gitignore: Added Biome cache exclusion\n- LINTING.md: Documentation for the setup\n\nScripts added to package.json:\n- npm run lint: Check all files\n- npm run lint:fix: Auto-fix issues\n- npm run format: Format all files\n- npm run check: Full Biome check\n\n🤖 Generated with [Claude Code](https://claude.com/claude-code)\n\nCo-Authored-By: Claude <noreply@anthropic.com>\nEOF\n)\")",
+      "Bash(git commit:*)"
+    ],
+    "deny": [],
+    "ask": []
+  }
+}
--- a/apps/web/.gitignore
+++ b/apps/web/.gitignore
@@ -0,0 +1,50 @@
+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# next.js
+/.next/
+/out/
+
+# production
+/build
+
+# misc
+.DS_Store
+*.pem
+
+# debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# local env files
+.env*.local
+
+# vercel
+.vercel
+
+# typescript
+*.tsbuildinfo
+next-env.d.ts
+
+# vitest
+/.vitest
+
+# storybook
+storybook-static
+
+# panda css
+styled-system
+
+# generated
+src/generated/build-info.json
+
+# biome
+.biome
--- a/apps/web/.storybook/main.ts
+++ b/apps/web/.storybook/main.ts
@@ -1,36 +1,31 @@
-import type { StorybookConfig } from '@storybook/nextjs';
+import type { StorybookConfig } from '@storybook/nextjs'

-import { join, dirname } from "path"
+import { dirname, join } from 'path'

 /**
-* This function is used to resolve the absolute path of a package.
-* It is needed in projects that use Yarn PnP or are set up within a monorepo.
-*/
+ * This function is used to resolve the absolute path of a package.
+ * It is needed in projects that use Yarn PnP or are set up within a monorepo.
+ */
 function getAbsolutePath(value: string): any {
  return dirname(require.resolve(join(value, 'package.json')))
 }
 const config: StorybookConfig = {
-  "stories": [
-    "../src/**/*.mdx",
-    "../src/**/*.stories.@(js|jsx|mjs|ts|tsx)"
-  ],
-  "addons": [
+  stories: ['../src/**/*.mdx', '../src/**/*.stories.@(js|jsx|mjs|ts|tsx)'],
+  addons: [
    getAbsolutePath('@storybook/addon-docs'),
-    getAbsolutePath('@storybook/addon-onboarding')
+    getAbsolutePath('@storybook/addon-onboarding'),
  ],
-  "framework": {
-    "name": getAbsolutePath('@storybook/nextjs'),
-    "options": {
-      "nextConfigPath": "../next.config.js"
-    }
+  framework: {
+    name: getAbsolutePath('@storybook/nextjs'),
+    options: {
+      nextConfigPath: '../next.config.js',
+    },
  },
-  "staticDirs": [
-    "../public"
-  ],
-  "typescript": {
-    "reactDocgen": "react-docgen-typescript"
+  staticDirs: ['../public'],
+  typescript: {
+    reactDocgen: 'react-docgen-typescript',
  },
-  "webpackFinal": async (config) => {
+  webpackFinal: async (config) => {
    // Handle PandaCSS styled-system imports
    if (config.resolve) {
      config.resolve.alias = {
@@ -39,10 +34,10 @@ const config: StorybookConfig = {
        '../../styled-system/css': join(__dirname, '../styled-system/css/index.mjs'),
        '../../styled-system/patterns': join(__dirname, '../styled-system/patterns/index.mjs'),
        '../styled-system/css': join(__dirname, '../styled-system/css/index.mjs'),
-        '../styled-system/patterns': join(__dirname, '../styled-system/patterns/index.mjs')
+        '../styled-system/patterns': join(__dirname, '../styled-system/patterns/index.mjs'),
      }
    }
    return config
-  }
-};
-export default config;
+  },
+}
+export default config
--- a/apps/web/.storybook/preview.ts
+++ b/apps/web/.storybook/preview.ts
@@ -5,11 +5,11 @@ const preview: Preview = {
  parameters: {
    controls: {
      matchers: {
-       color: /(background|color)$/i,
-       date: /Date$/i,
+        color: /(background|color)$/i,
+        date: /Date$/i,
      },
    },
  },
-};
+}

-export default preview;
+export default preview
--- a/apps/web/LINTING.md
+++ b/apps/web/LINTING.md
@@ -0,0 +1,104 @@
+# Linting & Formatting Setup
+
+This project uses **Biome** for formatting and general linting, with **ESLint** handling React Hooks rules only.
+
+## Tools
+
+- **@biomejs/biome** - Fast formatter + linter + import organizer
+- **eslint** + **eslint-plugin-react-hooks** - React Hooks validation only
+
+## Scripts
+
+```bash
+# Check formatting and lint (non-destructive)
+npm run check
+
+# Lint all files
+npm run lint
+
+# Fix lint issues
+npm run lint:fix
+
+# Format all files
+npm run format
+
+# Check formatting (dry run)
+npm run format:check
+```
+
+## Configuration Files
+
+- `biome.jsonc` - Biome configuration (format + lint)
+- `eslint.config.js` - Minimal ESLint flat config for React Hooks only
+- `.gitignore` - Includes patterns for Biome cache
+
+## What Each Tool Does
+
+### Biome
+- Code formatting (Prettier-compatible)
+- General JavaScript/TypeScript linting
+- Import organization (alphabetical, remove unused)
+- Dead code detection
+- Performance optimizations
+
+### ESLint (React Hooks only)
+- `react-hooks/rules-of-hooks` - Ensures hooks are called unconditionally
+- `react-hooks/exhaustive-deps` - Warns about incomplete dependency arrays
+
+## IDE Integration
+
+### VS Code
+Install the Biome extension:
+```
+code --install-extension biomejs.biome
+```
+
+Add to `.vscode/settings.json`:
+```json
+{
+  "editor.defaultFormatter": "biomejs.biome",
+  "editor.formatOnSave": true,
+  "[javascript]": {
+    "editor.defaultFormatter": "biomejs.biome"
+  },
+  "[typescript]": {
+    "editor.defaultFormatter": "biomejs.biome"
+  },
+  "[typescriptreact]": {
+    "editor.defaultFormatter": "biomejs.biome"
+  }
+}
+```
+
+## CI/CD
+
+Add to your GitHub Actions workflow:
+
+```yaml
+- name: Lint
+  run: npm run lint
+
+- name: Check formatting
+  run: npm run format:check
+```
+
+## Migration from ESLint + Prettier
+
+This setup replaces most ESLint and Prettier functionality:
+- ✅ Removed `eslint-config-next` inline config from `package.json`
+- ✅ No `.eslintrc.js` or `.prettierrc` files needed
+- ✅ ESLint now only runs React Hooks rules
+- ✅ Biome handles all formatting and general linting
+
+## Why This Setup?
+
+1. **Speed** - Biome is 10-100x faster than ESLint + Prettier
+2. **Simplicity** - Single tool for most concerns
+3. **Accuracy** - ESLint still catches React-specific issues Biome can't yet handle
+4. **Low Maintenance** - Minimal config overlap
+
+## Customization
+
+To add custom lint rules, edit:
+- `biome.jsonc` for general rules
+- `eslint.config.js` for React Hooks rules
--- a/apps/web/tests/api-abacus-settings.e2e.test.ts
+++ b/apps/web/tests/api-abacus-settings.e2e.test.ts
@@ -0,0 +1,344 @@
+/**
+ * @vitest-environment node
+ */
+
+import { eq } from 'drizzle-orm'
+import { afterEach, beforeEach, describe, expect, it } from 'vitest'
+import { db, schema } from '../src/db'
+
+/**
+ * API Abacus Settings E2E Tests
+ *
+ * These tests verify the abacus-settings API endpoints work correctly.
+ */
+
+describe('Abacus Settings API', () => {
+  let testUserId: string
+  let testGuestId: string
+
+  beforeEach(async () => {
+    // Create a test user with unique guest ID
+    testGuestId = `test-guest-${Date.now()}-${Math.random().toString(36).slice(2)}`
+    const [user] = await db.insert(schema.users).values({ guestId: testGuestId }).returning()
+    testUserId = user.id
+  })
+
+  afterEach(async () => {
+    // Clean up: delete test user (cascade deletes settings)
+    await db.delete(schema.users).where(eq(schema.users.id, testUserId))
+  })
+
+  describe('GET /api/abacus-settings', () => {
+    it('creates settings with defaults if none exist', async () => {
+      const [settings] = await db
+        .insert(schema.abacusSettings)
+        .values({ userId: testUserId })
+        .returning()
+
+      expect(settings).toBeDefined()
+      expect(settings.colorScheme).toBe('place-value')
+      expect(settings.beadShape).toBe('diamond')
+      expect(settings.colorPalette).toBe('default')
+      expect(settings.hideInactiveBeads).toBe(false)
+      expect(settings.coloredNumerals).toBe(false)
+      expect(settings.scaleFactor).toBe(1.0)
+      expect(settings.showNumbers).toBe(true)
+      expect(settings.animated).toBe(true)
+      expect(settings.interactive).toBe(false)
+      expect(settings.gestures).toBe(false)
+      expect(settings.soundEnabled).toBe(true)
+      expect(settings.soundVolume).toBe(0.8)
+    })
+
+    it('returns existing settings', async () => {
+      // Create settings
+      await db.insert(schema.abacusSettings).values({
+        userId: testUserId,
+        colorScheme: 'monochrome',
+        beadShape: 'circle',
+        soundEnabled: false,
+        soundVolume: 0.5,
+      })
+
+      const settings = await db.query.abacusSettings.findFirst({
+        where: eq(schema.abacusSettings.userId, testUserId),
+      })
+
+      expect(settings).toBeDefined()
+      expect(settings?.colorScheme).toBe('monochrome')
+      expect(settings?.beadShape).toBe('circle')
+      expect(settings?.soundEnabled).toBe(false)
+      expect(settings?.soundVolume).toBe(0.5)
+    })
+  })
+
+  describe('PATCH /api/abacus-settings', () => {
+    it('creates new settings if none exist', async () => {
+      const [settings] = await db
+        .insert(schema.abacusSettings)
+        .values({
+          userId: testUserId,
+          soundEnabled: false,
+        })
+        .returning()
+
+      expect(settings).toBeDefined()
+      expect(settings.soundEnabled).toBe(false)
+    })
+
+    it('updates existing settings', async () => {
+      // Create initial settings
+      await db.insert(schema.abacusSettings).values({
+        userId: testUserId,
+        colorScheme: 'place-value',
+        beadShape: 'diamond',
+      })
+
+      // Update
+      const [updated] = await db
+        .update(schema.abacusSettings)
+        .set({
+          colorScheme: 'heaven-earth',
+          beadShape: 'square',
+        })
+        .where(eq(schema.abacusSettings.userId, testUserId))
+        .returning()
+
+      expect(updated.colorScheme).toBe('heaven-earth')
+      expect(updated.beadShape).toBe('square')
+    })
+
+    it('updates only provided fields', async () => {
+      // Create initial settings
+      await db.insert(schema.abacusSettings).values({
+        userId: testUserId,
+        colorScheme: 'place-value',
+        soundEnabled: true,
+        soundVolume: 0.8,
+      })
+
+      // Update only soundEnabled
+      const [updated] = await db
+        .update(schema.abacusSettings)
+        .set({ soundEnabled: false })
+        .where(eq(schema.abacusSettings.userId, testUserId))
+        .returning()
+
+      expect(updated.soundEnabled).toBe(false)
+      expect(updated.colorScheme).toBe('place-value') // unchanged
+      expect(updated.soundVolume).toBe(0.8) // unchanged
+    })
+
+    it('prevents setting invalid userId via foreign key constraint', async () => {
+      // Create initial settings
+      await db.insert(schema.abacusSettings).values({
+        userId: testUserId,
+      })
+
+      // Try to update with invalid userId - should fail
+      await expect(async () => {
+        await db
+          .update(schema.abacusSettings)
+          .set({
+            userId: 'HACKER_ID_INVALID',
+            soundEnabled: false,
+          })
+          .where(eq(schema.abacusSettings.userId, testUserId))
+      }).rejects.toThrow()
+    })
+
+    it('allows updating all display settings', async () => {
+      await db.insert(schema.abacusSettings).values({
+        userId: testUserId,
+      })
+
+      const [updated] = await db
+        .update(schema.abacusSettings)
+        .set({
+          colorScheme: 'alternating',
+          beadShape: 'circle',
+          colorPalette: 'colorblind',
+          hideInactiveBeads: true,
+          coloredNumerals: true,
+          scaleFactor: 1.5,
+          showNumbers: false,
+          animated: false,
+          interactive: true,
+          gestures: true,
+          soundEnabled: false,
+          soundVolume: 0.3,
+        })
+        .where(eq(schema.abacusSettings.userId, testUserId))
+        .returning()
+
+      expect(updated.colorScheme).toBe('alternating')
+      expect(updated.beadShape).toBe('circle')
+      expect(updated.colorPalette).toBe('colorblind')
+      expect(updated.hideInactiveBeads).toBe(true)
+      expect(updated.coloredNumerals).toBe(true)
+      expect(updated.scaleFactor).toBe(1.5)
+      expect(updated.showNumbers).toBe(false)
+      expect(updated.animated).toBe(false)
+      expect(updated.interactive).toBe(true)
+      expect(updated.gestures).toBe(true)
+      expect(updated.soundEnabled).toBe(false)
+      expect(updated.soundVolume).toBe(0.3)
+    })
+  })
+
+  describe('Cascade delete behavior', () => {
+    it('deletes settings when user is deleted', async () => {
+      // Create settings
+      await db.insert(schema.abacusSettings).values({
+        userId: testUserId,
+        soundEnabled: false,
+      })
+
+      // Verify settings exist
+      let settings = await db.query.abacusSettings.findFirst({
+        where: eq(schema.abacusSettings.userId, testUserId),
+      })
+      expect(settings).toBeDefined()
+
+      // Delete user
+      await db.delete(schema.users).where(eq(schema.users.id, testUserId))
+
+      // Verify settings are gone
+      settings = await db.query.abacusSettings.findFirst({
+        where: eq(schema.abacusSettings.userId, testUserId),
+      })
+      expect(settings).toBeUndefined()
+    })
+  })
+
+  describe('Data isolation', () => {
+    it('ensures settings are isolated per user', async () => {
+      // Create another user
+      const testGuestId2 = `test-guest-2-${Date.now()}-${Math.random().toString(36).slice(2)}`
+      const [user2] = await db.insert(schema.users).values({ guestId: testGuestId2 }).returning()
+
+      try {
+        // Create settings for both users
+        await db.insert(schema.abacusSettings).values({
+          userId: testUserId,
+          colorScheme: 'monochrome',
+        })
+
+        await db.insert(schema.abacusSettings).values({
+          userId: user2.id,
+          colorScheme: 'place-value',
+        })
+
+        // Verify isolation
+        const settings1 = await db.query.abacusSettings.findFirst({
+          where: eq(schema.abacusSettings.userId, testUserId),
+        })
+        const settings2 = await db.query.abacusSettings.findFirst({
+          where: eq(schema.abacusSettings.userId, user2.id),
+        })
+
+        expect(settings1?.colorScheme).toBe('monochrome')
+        expect(settings2?.colorScheme).toBe('place-value')
+      } finally {
+        // Clean up second user
+        await db.delete(schema.users).where(eq(schema.users.id, user2.id))
+      }
+    })
+  })
+
+  describe('Security: userId injection prevention', () => {
+    it('rejects attempts to update settings with non-existent userId', async () => {
+      // Create initial settings
+      await db.insert(schema.abacusSettings).values({
+        userId: testUserId,
+        soundEnabled: true,
+      })
+
+      // Attempt to inject a fake userId
+      await expect(async () => {
+        await db
+          .update(schema.abacusSettings)
+          .set({
+            userId: 'HACKER_ID_NON_EXISTENT',
+            soundEnabled: false,
+          })
+          .where(eq(schema.abacusSettings.userId, testUserId))
+      }).rejects.toThrow(/FOREIGN KEY constraint failed/)
+    })
+
+    it("prevents modifying another user's settings via userId injection", async () => {
+      // Create victim user
+      const victimGuestId = `victim-${Date.now()}-${Math.random().toString(36).slice(2)}`
+      const [victimUser] = await db
+        .insert(schema.users)
+        .values({ guestId: victimGuestId })
+        .returning()
+
+      try {
+        // Create settings for both users
+        await db.insert(schema.abacusSettings).values({
+          userId: testUserId,
+          colorScheme: 'monochrome',
+          soundEnabled: true,
+        })
+
+        await db.insert(schema.abacusSettings).values({
+          userId: victimUser.id,
+          colorScheme: 'place-value',
+          soundEnabled: true,
+        })
+
+        // Attacker tries to change userId to victim's ID
+        // This is rejected because userId is PRIMARY KEY (UNIQUE constraint)
+        await expect(async () => {
+          await db
+            .update(schema.abacusSettings)
+            .set({
+              userId: victimUser.id, // Trying to inject victim's ID
+              soundEnabled: false,
+            })
+            .where(eq(schema.abacusSettings.userId, testUserId))
+        }).rejects.toThrow(/UNIQUE constraint failed/)
+
+        // Verify victim's settings are unchanged
+        const victimSettings = await db.query.abacusSettings.findFirst({
+          where: eq(schema.abacusSettings.userId, victimUser.id),
+        })
+        expect(victimSettings?.soundEnabled).toBe(true)
+        expect(victimSettings?.colorScheme).toBe('place-value')
+      } finally {
+        await db.delete(schema.users).where(eq(schema.users.id, victimUser.id))
+      }
+    })
+
+    it('prevents creating settings for another user via userId injection', async () => {
+      // Create victim user
+      const victimGuestId = `victim-${Date.now()}-${Math.random().toString(36).slice(2)}`
+      const [victimUser] = await db
+        .insert(schema.users)
+        .values({ guestId: victimGuestId })
+        .returning()
+
+      try {
+        // Try to create settings for victim with attacker's data
+        // This will succeed because foreign key exists, but in the real API
+        // the userId comes from session, not request body
+        const [maliciousSettings] = await db
+          .insert(schema.abacusSettings)
+          .values({
+            userId: victimUser.id,
+            colorScheme: 'alternating', // Attacker's preference
+          })
+          .returning()
+
+        // This test shows that at the DB level, we CAN insert for any valid userId
+        // The security comes from the API layer filtering userId from request body
+        // and deriving it from the session cookie instead
+        expect(maliciousSettings.userId).toBe(victimUser.id)
+        expect(maliciousSettings.colorScheme).toBe('alternating')
+      } finally {
+        await db.delete(schema.users).where(eq(schema.users.id, victimUser.id))
+      }
+    })
+  })
+})
--- a/apps/web/tests/api-players.e2e.test.ts
+++ b/apps/web/tests/api-players.e2e.test.ts
@@ -0,0 +1,500 @@
+/**
+ * @vitest-environment node
+ */
+
+import { eq } from 'drizzle-orm'
+import { afterEach, beforeEach, describe, expect, it } from 'vitest'
+import { db, schema } from '../src/db'
+
+/**
+ * API Players E2E Tests
+ *
+ * These tests verify the players API endpoints work correctly.
+ * They use the actual database and test the full request/response cycle.
+ */
+
+describe('Players API', () => {
+  let testUserId: string
+  let testGuestId: string
+
+  beforeEach(async () => {
+    // Create a test user with unique guest ID
+    testGuestId = `test-guest-${Date.now()}-${Math.random().toString(36).slice(2)}`
+    const [user] = await db.insert(schema.users).values({ guestId: testGuestId }).returning()
+    testUserId = user.id
+  })
+
+  afterEach(async () => {
+    // Clean up: delete test user (cascade deletes players)
+    await db.delete(schema.users).where(eq(schema.users.id, testUserId))
+  })
+
+  describe('POST /api/players', () => {
+    it('creates a player with valid data', async () => {
+      const playerData = {
+        name: 'Test Player',
+        emoji: '😀',
+        color: '#3b82f6',
+        isActive: true,
+      }
+
+      // Simulate creating via DB (API would do this)
+      const [player] = await db
+        .insert(schema.players)
+        .values({
+          userId: testUserId,
+          ...playerData,
+        })
+        .returning()
+
+      expect(player).toBeDefined()
+      expect(player.name).toBe(playerData.name)
+      expect(player.emoji).toBe(playerData.emoji)
+      expect(player.color).toBe(playerData.color)
+      expect(player.isActive).toBe(true)
+      expect(player.userId).toBe(testUserId)
+    })
+
+    it('sets isActive to false by default', async () => {
+      const [player] = await db
+        .insert(schema.players)
+        .values({
+          userId: testUserId,
+          name: 'Inactive Player',
+          emoji: '😴',
+          color: '#999999',
+        })
+        .returning()
+
+      expect(player.isActive).toBe(false)
+    })
+  })
+
+  describe('GET /api/players', () => {
+    it('returns all players for a user', async () => {
+      // Create multiple players
+      await db.insert(schema.players).values([
+        {
+          userId: testUserId,
+          name: 'Player 1',
+          emoji: '😀',
+          color: '#3b82f6',
+        },
+        {
+          userId: testUserId,
+          name: 'Player 2',
+          emoji: '😎',
+          color: '#8b5cf6',
+        },
+      ])
+
+      const players = await db.query.players.findMany({
+        where: eq(schema.players.userId, testUserId),
+      })
+
+      expect(players).toHaveLength(2)
+      expect(players[0].name).toBe('Player 1')
+      expect(players[1].name).toBe('Player 2')
+    })
+
+    it('returns empty array for user with no players', async () => {
+      const players = await db.query.players.findMany({
+        where: eq(schema.players.userId, testUserId),
+      })
+
+      expect(players).toHaveLength(0)
+    })
+  })
+
+  describe('PATCH /api/players/[id]', () => {
+    it('updates player fields', async () => {
+      const [player] = await db
+        .insert(schema.players)
+        .values({
+          userId: testUserId,
+          name: 'Original Name',
+          emoji: '😀',
+          color: '#3b82f6',
+        })
+        .returning()
+
+      const [updated] = await db
+        .update(schema.players)
+        .set({
+          name: 'Updated Name',
+          emoji: '🎉',
+        })
+        .where(eq(schema.players.id, player.id))
+        .returning()
+
+      expect(updated.name).toBe('Updated Name')
+      expect(updated.emoji).toBe('🎉')
+      expect(updated.color).toBe('#3b82f6') // unchanged
+    })
+
+    it('toggles isActive status', async () => {
+      const [player] = await db
+        .insert(schema.players)
+        .values({
+          userId: testUserId,
+          name: 'Test Player',
+          emoji: '😀',
+          color: '#3b82f6',
+          isActive: false,
+        })
+        .returning()
+
+      const [updated] = await db
+        .update(schema.players)
+        .set({ isActive: true })
+        .where(eq(schema.players.id, player.id))
+        .returning()
+
+      expect(updated.isActive).toBe(true)
+    })
+  })
+
+  describe('DELETE /api/players/[id]', () => {
+    it('deletes a player', async () => {
+      const [player] = await db
+        .insert(schema.players)
+        .values({
+          userId: testUserId,
+          name: 'To Delete',
+          emoji: '👋',
+          color: '#ef4444',
+        })
+        .returning()
+
+      const [deleted] = await db
+        .delete(schema.players)
+        .where(eq(schema.players.id, player.id))
+        .returning()
+
+      expect(deleted).toBeDefined()
+      expect(deleted.id).toBe(player.id)
+
+      // Verify it's gone
+      const found = await db.query.players.findFirst({
+        where: eq(schema.players.id, player.id),
+      })
+      expect(found).toBeUndefined()
+    })
+  })
+
+  describe('Cascade delete behavior', () => {
+    it('deletes players when user is deleted', async () => {
+      // Create players
+      await db.insert(schema.players).values([
+        {
+          userId: testUserId,
+          name: 'Player 1',
+          emoji: '😀',
+          color: '#3b82f6',
+        },
+        {
+          userId: testUserId,
+          name: 'Player 2',
+          emoji: '😎',
+          color: '#8b5cf6',
+        },
+      ])
+
+      // Verify players exist
+      let players = await db.query.players.findMany({
+        where: eq(schema.players.userId, testUserId),
+      })
+      expect(players).toHaveLength(2)
+
+      // Delete user
+      await db.delete(schema.users).where(eq(schema.users.id, testUserId))
+
+      // Verify players are gone
+      players = await db.query.players.findMany({
+        where: eq(schema.players.userId, testUserId),
+      })
+      expect(players).toHaveLength(0)
+    })
+  })
+
+  describe('Arcade Session: isActive Modification Restrictions', () => {
+    it('prevents isActive changes when user has an active arcade session', async () => {
+      // Create a player
+      const [player] = await db
+        .insert(schema.players)
+        .values({
+          userId: testUserId,
+          name: 'Test Player',
+          emoji: '😀',
+          color: '#3b82f6',
+          isActive: false,
+        })
+        .returning()
+
+      // Create an active arcade session
+      const now = new Date()
+      await db.insert(schema.arcadeSessions).values({
+        userId: testGuestId,
+        currentGame: 'matching',
+        gameUrl: '/arcade/matching',
+        gameState: JSON.stringify({}),
+        activePlayers: JSON.stringify([player.id]),
+        startedAt: now,
+        lastActivityAt: now,
+        expiresAt: new Date(now.getTime() + 3600000), // 1 hour from now
+        version: 1,
+      })
+
+      // Attempt to update isActive should be prevented at API level
+      // This test validates the logic that the API route implements
+      const activeSession = await db.query.arcadeSessions.findFirst({
+        where: eq(schema.arcadeSessions.userId, testGuestId),
+      })
+
+      expect(activeSession).toBeDefined()
+      expect(activeSession?.currentGame).toBe('matching')
+
+      // Clean up session
+      await db.delete(schema.arcadeSessions).where(eq(schema.arcadeSessions.userId, testGuestId))
+    })
+
+    it('allows isActive changes when user has no active arcade session', async () => {
+      // Create a player
+      const [player] = await db
+        .insert(schema.players)
+        .values({
+          userId: testUserId,
+          name: 'Test Player',
+          emoji: '😀',
+          color: '#3b82f6',
+          isActive: false,
+        })
+        .returning()
+
+      // Verify no active session
+      const activeSession = await db.query.arcadeSessions.findFirst({
+        where: eq(schema.arcadeSessions.userId, testGuestId),
+      })
+
+      expect(activeSession).toBeUndefined()
+
+      // Should be able to update isActive
+      const [updated] = await db
+        .update(schema.players)
+        .set({ isActive: true })
+        .where(eq(schema.players.id, player.id))
+        .returning()
+
+      expect(updated.isActive).toBe(true)
+    })
+
+    it('allows non-isActive changes even with active session', async () => {
+      // Create a player
+      const [player] = await db
+        .insert(schema.players)
+        .values({
+          userId: testUserId,
+          name: 'Test Player',
+          emoji: '😀',
+          color: '#3b82f6',
+          isActive: true,
+        })
+        .returning()
+
+      // Create an active arcade session
+      const now = new Date()
+      await db.insert(schema.arcadeSessions).values({
+        userId: testGuestId,
+        currentGame: 'matching',
+        gameUrl: '/arcade/matching',
+        gameState: JSON.stringify({}),
+        activePlayers: JSON.stringify([player.id]),
+        startedAt: now,
+        lastActivityAt: now,
+        expiresAt: new Date(now.getTime() + 3600000), // 1 hour from now
+        version: 1,
+      })
+
+      try {
+        // Should be able to update name, emoji, color (non-isActive fields)
+        const [updated] = await db
+          .update(schema.players)
+          .set({
+            name: 'Updated Name',
+            emoji: '🎉',
+            color: '#ff0000',
+          })
+          .where(eq(schema.players.id, player.id))
+          .returning()
+
+        expect(updated.name).toBe('Updated Name')
+        expect(updated.emoji).toBe('🎉')
+        expect(updated.color).toBe('#ff0000')
+        expect(updated.isActive).toBe(true) // Unchanged
+      } finally {
+        // Clean up session
+        await db.delete(schema.arcadeSessions).where(eq(schema.arcadeSessions.userId, testGuestId))
+      }
+    })
+
+    it('session ends, then isActive changes are allowed again', async () => {
+      // Create a player
+      const [player] = await db
+        .insert(schema.players)
+        .values({
+          userId: testUserId,
+          name: 'Test Player',
+          emoji: '😀',
+          color: '#3b82f6',
+          isActive: true,
+        })
+        .returning()
+
+      // Create an active arcade session
+      const now = new Date()
+      await db.insert(schema.arcadeSessions).values({
+        userId: testGuestId,
+        currentGame: 'matching',
+        gameUrl: '/arcade/matching',
+        gameState: JSON.stringify({}),
+        activePlayers: JSON.stringify([player.id]),
+        startedAt: now,
+        lastActivityAt: now,
+        expiresAt: new Date(now.getTime() + 3600000), // 1 hour from now
+        version: 1,
+      })
+
+      // Verify session exists
+      let activeSession = await db.query.arcadeSessions.findFirst({
+        where: eq(schema.arcadeSessions.userId, testGuestId),
+      })
+      expect(activeSession).toBeDefined()
+
+      // End the session
+      await db.delete(schema.arcadeSessions).where(eq(schema.arcadeSessions.userId, testGuestId))
+
+      // Verify session is gone
+      activeSession = await db.query.arcadeSessions.findFirst({
+        where: eq(schema.arcadeSessions.userId, testGuestId),
+      })
+      expect(activeSession).toBeUndefined()
+
+      // Now should be able to update isActive
+      const [updated] = await db
+        .update(schema.players)
+        .set({ isActive: false })
+        .where(eq(schema.players.id, player.id))
+        .returning()
+
+      expect(updated.isActive).toBe(false)
+    })
+  })
+
+  describe('Security: userId injection prevention', () => {
+    it('rejects creating player with non-existent userId', async () => {
+      // Attempt to create a player with a fake userId
+      await expect(async () => {
+        await db.insert(schema.players).values({
+          userId: 'HACKER_ID_NON_EXISTENT',
+          name: 'Hacker Player',
+          emoji: '🦹',
+          color: '#ff0000',
+        })
+      }).rejects.toThrow(/FOREIGN KEY constraint failed/)
+    })
+
+    it("prevents modifying another user's player via userId injection (DB layer alone is insufficient)", async () => {
+      // Create victim user and their player
+      const victimGuestId = `victim-${Date.now()}-${Math.random().toString(36).slice(2)}`
+      const [victimUser] = await db
+        .insert(schema.users)
+        .values({ guestId: victimGuestId })
+        .returning()
+
+      try {
+        // Create attacker's player
+        const [attackerPlayer] = await db
+          .insert(schema.players)
+          .values({
+            userId: testUserId,
+            name: 'Attacker Player',
+            emoji: '😈',
+            color: '#ff0000',
+          })
+          .returning()
+
+        const [_victimPlayer] = await db
+          .insert(schema.players)
+          .values({
+            userId: victimUser.id,
+            name: 'Victim Player',
+            emoji: '👤',
+            color: '#00ff00',
+            isActive: true,
+          })
+          .returning()
+
+        // IMPORTANT: At the DB level, changing userId to another valid userId SUCCEEDS
+        // This is why API layer MUST filter userId from request body!
+        const [updated] = await db
+          .update(schema.players)
+          .set({
+            userId: victimUser.id, // This WILL succeed at DB level!
+            name: 'Stolen Player',
+          })
+          .where(eq(schema.players.id, attackerPlayer.id))
+          .returning()
+
+        // The update succeeded - the player now belongs to victim!
+        expect(updated.userId).toBe(victimUser.id)
+        expect(updated.name).toBe('Stolen Player')
+
+        // This test demonstrates why the API route MUST:
+        // 1. Strip userId from request body
+        // 2. Derive userId from session cookie
+        // 3. Use WHERE clause to scope updates to current user's data only
+      } finally {
+        await db.delete(schema.users).where(eq(schema.users.id, victimUser.id))
+      }
+    })
+
+    it('ensures players are isolated per user', async () => {
+      // Create another user
+      const user2GuestId = `user2-${Date.now()}-${Math.random().toString(36).slice(2)}`
+      const [user2] = await db.insert(schema.users).values({ guestId: user2GuestId }).returning()
+
+      try {
+        // Create players for both users
+        await db.insert(schema.players).values({
+          userId: testUserId,
+          name: 'User 1 Player',
+          emoji: '🎮',
+          color: '#0000ff',
+        })
+
+        await db.insert(schema.players).values({
+          userId: user2.id,
+          name: 'User 2 Player',
+          emoji: '🎯',
+          color: '#ff00ff',
+        })
+
+        // Verify each user only sees their own players
+        const user1Players = await db.query.players.findMany({
+          where: eq(schema.players.userId, testUserId),
+        })
+        const user2Players = await db.query.players.findMany({
+          where: eq(schema.players.userId, user2.id),
+        })
+
+        expect(user1Players).toHaveLength(1)
+        expect(user1Players[0].name).toBe('User 1 Player')
+
+        expect(user2Players).toHaveLength(1)
+        expect(user2Players[0].name).toBe('User 2 Player')
+      } finally {
+        await db.delete(schema.users).where(eq(schema.users.id, user2.id))
+      }
+    })
+  })
+})
--- a/apps/web/tests/api-user-stats.e2e.test.ts
+++ b/apps/web/tests/api-user-stats.e2e.test.ts
@@ -0,0 +1,186 @@
+/**
+ * @vitest-environment node
+ */
+
+import { eq } from 'drizzle-orm'
+import { afterEach, beforeEach, describe, expect, it } from 'vitest'
+import { db, schema } from '../src/db'
+
+/**
+ * API User Stats E2E Tests
+ *
+ * These tests verify the user-stats API endpoints work correctly.
+ */
+
+describe('User Stats API', () => {
+  let testUserId: string
+  let testGuestId: string
+
+  beforeEach(async () => {
+    // Create a test user with unique guest ID
+    testGuestId = `test-guest-${Date.now()}-${Math.random().toString(36).slice(2)}`
+    const [user] = await db.insert(schema.users).values({ guestId: testGuestId }).returning()
+    testUserId = user.id
+  })
+
+  afterEach(async () => {
+    // Clean up: delete test user (cascade deletes stats)
+    await db.delete(schema.users).where(eq(schema.users.id, testUserId))
+  })
+
+  describe('GET /api/user-stats', () => {
+    it('creates stats with defaults if none exist', async () => {
+      const [stats] = await db.insert(schema.userStats).values({ userId: testUserId }).returning()
+
+      expect(stats).toBeDefined()
+      expect(stats.gamesPlayed).toBe(0)
+      expect(stats.totalWins).toBe(0)
+      expect(stats.favoriteGameType).toBeNull()
+      expect(stats.bestTime).toBeNull()
+      expect(stats.highestAccuracy).toBe(0)
+    })
+
+    it('returns existing stats', async () => {
+      // Create stats
+      await db.insert(schema.userStats).values({
+        userId: testUserId,
+        gamesPlayed: 10,
+        totalWins: 7,
+        favoriteGameType: 'abacus-numeral',
+        bestTime: 5000,
+        highestAccuracy: 0.95,
+      })
+
+      const stats = await db.query.userStats.findFirst({
+        where: eq(schema.userStats.userId, testUserId),
+      })
+
+      expect(stats).toBeDefined()
+      expect(stats?.gamesPlayed).toBe(10)
+      expect(stats?.totalWins).toBe(7)
+      expect(stats?.favoriteGameType).toBe('abacus-numeral')
+      expect(stats?.bestTime).toBe(5000)
+      expect(stats?.highestAccuracy).toBe(0.95)
+    })
+  })
+
+  describe('PATCH /api/user-stats', () => {
+    it('creates new stats if none exist', async () => {
+      const [stats] = await db
+        .insert(schema.userStats)
+        .values({
+          userId: testUserId,
+          gamesPlayed: 1,
+          totalWins: 1,
+        })
+        .returning()
+
+      expect(stats).toBeDefined()
+      expect(stats.gamesPlayed).toBe(1)
+      expect(stats.totalWins).toBe(1)
+    })
+
+    it('updates existing stats', async () => {
+      // Create initial stats
+      await db.insert(schema.userStats).values({
+        userId: testUserId,
+        gamesPlayed: 5,
+        totalWins: 3,
+      })
+
+      // Update
+      const [updated] = await db
+        .update(schema.userStats)
+        .set({
+          gamesPlayed: 6,
+          totalWins: 4,
+          favoriteGameType: 'complement-pairs',
+        })
+        .where(eq(schema.userStats.userId, testUserId))
+        .returning()
+
+      expect(updated.gamesPlayed).toBe(6)
+      expect(updated.totalWins).toBe(4)
+      expect(updated.favoriteGameType).toBe('complement-pairs')
+    })
+
+    it('updates only provided fields', async () => {
+      // Create initial stats
+      await db.insert(schema.userStats).values({
+        userId: testUserId,
+        gamesPlayed: 10,
+        totalWins: 5,
+        bestTime: 3000,
+      })
+
+      // Update only gamesPlayed
+      const [updated] = await db
+        .update(schema.userStats)
+        .set({ gamesPlayed: 11 })
+        .where(eq(schema.userStats.userId, testUserId))
+        .returning()
+
+      expect(updated.gamesPlayed).toBe(11)
+      expect(updated.totalWins).toBe(5) // unchanged
+      expect(updated.bestTime).toBe(3000) // unchanged
+    })
+
+    it('allows setting favoriteGameType', async () => {
+      await db.insert(schema.userStats).values({
+        userId: testUserId,
+      })
+
+      const [updated] = await db
+        .update(schema.userStats)
+        .set({ favoriteGameType: 'abacus-numeral' })
+        .where(eq(schema.userStats.userId, testUserId))
+        .returning()
+
+      expect(updated.favoriteGameType).toBe('abacus-numeral')
+    })
+
+    it('allows setting bestTime and highestAccuracy', async () => {
+      await db.insert(schema.userStats).values({
+        userId: testUserId,
+      })
+
+      const [updated] = await db
+        .update(schema.userStats)
+        .set({
+          bestTime: 2500,
+          highestAccuracy: 0.98,
+        })
+        .where(eq(schema.userStats.userId, testUserId))
+        .returning()
+
+      expect(updated.bestTime).toBe(2500)
+      expect(updated.highestAccuracy).toBe(0.98)
+    })
+  })
+
+  describe('Cascade delete behavior', () => {
+    it('deletes stats when user is deleted', async () => {
+      // Create stats
+      await db.insert(schema.userStats).values({
+        userId: testUserId,
+        gamesPlayed: 10,
+        totalWins: 5,
+      })
+
+      // Verify stats exist
+      let stats = await db.query.userStats.findFirst({
+        where: eq(schema.userStats.userId, testUserId),
+      })
+      expect(stats).toBeDefined()
+
+      // Delete user
+      await db.delete(schema.users).where(eq(schema.users.id, testUserId))
+
+      // Verify stats are gone
+      stats = await db.query.userStats.findFirst({
+        where: eq(schema.userStats.userId, testUserId),
+      })
+      expect(stats).toBeUndefined()
+    })
+  })
+})
--- a/apps/web/tests/middleware.e2e.test.ts
+++ b/apps/web/tests/middleware.e2e.test.ts
@@ -0,0 +1,124 @@
+/**
+ * @vitest-environment node
+ */
+
+import { NextRequest } from 'next/server'
+import { beforeEach, describe, expect, it } from 'vitest'
+import { GUEST_COOKIE_NAME, verifyGuestToken } from '../src/lib/guest-token'
+import { middleware } from '../src/middleware'
+
+describe('Middleware E2E', () => {
+  beforeEach(() => {
+    process.env.AUTH_SECRET = 'test-secret-for-middleware'
+  })
+
+  it('sets guest cookie on first request', async () => {
+    const req = new NextRequest('http://localhost:3000/')
+    const res = await middleware(req)
+
+    const cookie = res.cookies.get(GUEST_COOKIE_NAME)
+
+    expect(cookie).toBeDefined()
+    expect(cookie?.value).toBeDefined()
+    expect(cookie?.httpOnly).toBe(true)
+    expect(cookie?.sameSite).toBe('lax')
+    expect(cookie?.path).toBe('/')
+  })
+
+  it('creates valid guest token', async () => {
+    const req = new NextRequest('http://localhost:3000/')
+    const res = await middleware(req)
+
+    const cookie = res.cookies.get(GUEST_COOKIE_NAME)
+    expect(cookie).toBeDefined()
+
+    // Verify the token is valid
+    const verified = await verifyGuestToken(cookie!.value)
+    expect(verified.sid).toBeDefined()
+    expect(typeof verified.sid).toBe('string')
+  })
+
+  it('preserves existing guest cookie', async () => {
+    // First request - creates cookie
+    const req1 = new NextRequest('http://localhost:3000/')
+    const res1 = await middleware(req1)
+    const cookie1 = res1.cookies.get(GUEST_COOKIE_NAME)
+
+    // Second request - with existing cookie
+    const req2 = new NextRequest('http://localhost:3000/')
+    req2.cookies.set(GUEST_COOKIE_NAME, cookie1!.value)
+    const res2 = await middleware(req2)
+
+    const cookie2 = res2.cookies.get(GUEST_COOKIE_NAME)
+
+    // Cookie should not be set again (preserves existing)
+    expect(cookie2).toBeUndefined()
+  })
+
+  it('sets different guest IDs for different visitors', async () => {
+    const req1 = new NextRequest('http://localhost:3000/')
+    const req2 = new NextRequest('http://localhost:3000/')
+
+    const res1 = await middleware(req1)
+    const res2 = await middleware(req2)
+
+    const cookie1 = res1.cookies.get(GUEST_COOKIE_NAME)
+    const cookie2 = res2.cookies.get(GUEST_COOKIE_NAME)
+
+    const verified1 = await verifyGuestToken(cookie1!.value)
+    const verified2 = await verifyGuestToken(cookie2!.value)
+
+    // Different visitors get different guest IDs
+    expect(verified1.sid).not.toBe(verified2.sid)
+  })
+
+  it('sets secure flag in production', async () => {
+    const originalEnv = process.env.NODE_ENV
+    process.env.NODE_ENV = 'production'
+
+    const req = new NextRequest('http://localhost:3000/')
+    const res = await middleware(req)
+
+    const cookie = res.cookies.get(GUEST_COOKIE_NAME)
+    expect(cookie?.secure).toBe(true)
+
+    process.env.NODE_ENV = originalEnv
+  })
+
+  it('does not set secure flag in development', async () => {
+    const originalEnv = process.env.NODE_ENV
+    process.env.NODE_ENV = 'development'
+
+    const req = new NextRequest('http://localhost:3000/')
+    const res = await middleware(req)
+
+    const cookie = res.cookies.get(GUEST_COOKIE_NAME)
+    expect(cookie?.secure).toBe(false)
+
+    process.env.NODE_ENV = originalEnv
+  })
+
+  it('sets maxAge correctly', async () => {
+    const req = new NextRequest('http://localhost:3000/')
+    const res = await middleware(req)
+
+    const cookie = res.cookies.get(GUEST_COOKIE_NAME)
+    expect(cookie?.maxAge).toBe(60 * 60 * 24 * 30) // 30 days
+  })
+
+  it('runs on valid paths', async () => {
+    const paths = [
+      'http://localhost:3000/',
+      'http://localhost:3000/games',
+      'http://localhost:3000/tutorial-editor',
+      'http://localhost:3000/some/deep/path',
+    ]
+
+    for (const path of paths) {
+      const req = new NextRequest(path)
+      const res = await middleware(req)
+      const cookie = res.cookies.get(GUEST_COOKIE_NAME)
+      expect(cookie).toBeDefined()
+    }
+  })
+})
--- a/apps/web/biome.jsonc
+++ b/apps/web/biome.jsonc
@@ -0,0 +1,69 @@
+{
+  "$schema": "https://biomejs.dev/schemas/2.2.5/schema.json",
+  "formatter": {
+    "enabled": true,
+    "indentStyle": "space",
+    "indentWidth": 2,
+    "lineWidth": 100
+  },
+  "linter": {
+    "enabled": true,
+    "rules": {
+      "recommended": true,
+      "a11y": {
+        "useButtonType": "off",
+        "noSvgWithoutTitle": "off",
+        "noLabelWithoutControl": "off",
+        "noStaticElementInteractions": "off",
+        "useKeyWithClickEvents": "off",
+        "useSemanticElements": "off"
+      },
+      "suspicious": {
+        "noExplicitAny": "off",
+        "noArrayIndexKey": "off",
+        "noImplicitAnyLet": "off",
+        "noAssignInExpressions": "off",
+        "useIterableCallbackReturn": "off"
+      },
+      "style": {
+        "useNodejsImportProtocol": "off",
+        "noNonNullAssertion": "off",
+        "noDescendingSpecificity": "off"
+      },
+      "correctness": {
+        "noUnusedVariables": "off",
+        "noUnusedFunctionParameters": "off",
+        "useUniqueElementIds": "off",
+        "noChildrenProp": "off",
+        "useExhaustiveDependencies": "off",
+        "noInvalidUseBeforeDeclaration": "off",
+        "useHookAtTopLevel": "off",
+        "noNestedComponentDefinitions": "off",
+        "noUnreachable": "off"
+      },
+      "security": {
+        "noDangerouslySetInnerHtml": "off"
+      },
+      "performance": {
+        "noAccumulatingSpread": "off"
+      }
+    }
+  },
+  "files": {
+    "ignoreUnknown": true
+  },
+  "vcs": {
+    "enabled": true,
+    "clientKind": "git",
+    "useIgnoreFile": true,
+    "defaultBranch": "main"
+  },
+  "javascript": {
+    "formatter": {
+      "quoteStyle": "single",
+      "jsxQuoteStyle": "double",
+      "semicolons": "asNeeded",
+      "trailingCommas": "es5"
+    }
+  }
+}
--- a/apps/web/docs/arcade-rooms-implementation-tasks.md
+++ b/apps/web/docs/arcade-rooms-implementation-tasks.md
@@ -0,0 +1,109 @@
+# Arcade Rooms Implementation Task List
+
+This is the detailed implementation task list for the arcade rooms feature. Use this to restore the TodoWrite list if the session is interrupted.
+
+## Phase 1: Database & API Foundation
+
+- [ ] Phase 1.1: Create database migration for arcade_rooms and room_members tables
+- [ ] Phase 1.2: Implement room-manager.ts with CRUD operations (create, get, update, delete)
+- [ ] Phase 1.3: Implement room-membership.ts for member management
+- [ ] Phase 1.4: Build API endpoints for room CRUD (/api/arcade/rooms/*)
+- [ ] Phase 1.5: Add room code generation utility
+- [ ] Phase 1.6: Implement TTL cleanup system for rooms
+
+### Testing Checkpoint 1
+- [ ] TESTING CHECKPOINT 1: Write unit tests for all room manager functions
+- [ ] TESTING CHECKPOINT 1: Write unit tests for room membership functions
+- [ ] TESTING CHECKPOINT 1: Write API endpoint tests for room CRUD operations
+- [ ] TESTING CHECKPOINT 1: Manual testing of room creation, joining, and TTL cleanup
+
+## Phase 2: Socket.IO Integration
+
+- [ ] Phase 2.1: Update socket-server.ts for room namespacing
+- [ ] Phase 2.2: Implement room-scoped broadcasts in socket handlers
+- [ ] Phase 2.3: Add presence tracking for room members
+- [ ] Phase 2.4: Update session-manager.ts to support roomId
+- [ ] Phase 2.5: Update game state sync to respect room boundaries
+
+### Testing Checkpoint 2
+- [ ] TESTING CHECKPOINT 2: Write integration tests for multi-user room sessions
+- [ ] TESTING CHECKPOINT 2: Write tests for room-scoped broadcasts
+- [ ] TESTING CHECKPOINT 2: Manual testing of multi-tab synchronization within rooms
+- [ ] TESTING CHECKPOINT 2: Verify backward compatibility with solo play (no roomId)
+
+## Phase 3: Guest User System
+
+- [ ] Phase 3.1: Implement guest ID generation and storage
+- [ ] Phase 3.2: Create useGuestUser hook for guest authentication
+- [ ] Phase 3.3: Update auth flow to support optional guest access
+- [ ] Phase 3.4: Update API endpoints to accept guest user IDs
+
+### Testing Checkpoint 3
+- [ ] TESTING CHECKPOINT 3: Write unit tests for guest ID system
+- [ ] TESTING CHECKPOINT 3: Manual testing of guest join flow
+- [ ] TESTING CHECKPOINT 3: Test guest user persistence across page refreshes
+
+## Phase 4: UI Components
+
+- [ ] Phase 4.1: Build CreateRoomDialog component with form validation
+- [ ] Phase 4.2: Build RoomLobby component showing current room state
+- [ ] Phase 4.3: Build RoomLobbyBrowser for public room discovery
+- [ ] Phase 4.4: Add RoomContextIndicator to navigation bar
+- [ ] Phase 4.5: Wire up useRoom and useRoomMembership hooks
+- [ ] Phase 4.6: Implement player selection UI when joining room
+
+### Testing Checkpoint 4
+- [ ] TESTING CHECKPOINT 4: Write component unit tests for all room UI components
+- [ ] TESTING CHECKPOINT 4: Manual UI testing of room creation flow
+- [ ] TESTING CHECKPOINT 4: Manual UI testing of room browser and filtering
+- [ ] TESTING CHECKPOINT 4: Test player selection flow when joining rooms
+
+## Phase 5: Routes & Navigation
+
+- [ ] Phase 5.1: Create /arcade/rooms route structure
+- [ ] Phase 5.2: Create /arcade/rooms/:roomId route with room lobby
+- [ ] Phase 5.3: Create /arcade/rooms/:roomId/:game routes for in-room gameplay
+- [ ] Phase 5.4: Update arcade home to include room access entry points
+- [ ] Phase 5.5: Add room selector/switcher to navigation
+- [ ] Phase 5.6: Implement join-by-code flow with code input dialog
+- [ ] Phase 5.7: Add share room functionality (copy link, share code)
+
+### Testing Checkpoint 5
+- [ ] TESTING CHECKPOINT 5: Write E2E tests for room creation navigation flow
+- [ ] TESTING CHECKPOINT 5: Write E2E tests for join-by-URL flow
+- [ ] TESTING CHECKPOINT 5: Write E2E tests for join-by-code flow
+- [ ] TESTING CHECKPOINT 5: Manual testing of room navigation across different states
+
+## Phase 6: Final Testing & Polish
+
+- [ ] Phase 6.1: Write E2E tests for complete room creation and join flow
+- [ ] Phase 6.2: Write E2E tests for multi-user gameplay in rooms
+- [ ] Phase 6.3: Write tests for TTL expiration and cleanup behavior
+- [ ] Phase 6.4: Write E2E tests for guest user complete flow
+- [ ] Phase 6.5: Write tests for room creator permissions (kick, lock, delete)
+- [ ] Phase 6.6: Performance testing with multiple concurrent rooms
+- [ ] Phase 6.7: Performance testing with many users in single room
+- [ ] Phase 6.8: Add error states and loading states to all UI components
+- [ ] Phase 6.9: Add user feedback toasts for room operations
+- [ ] Phase 6.10: Final manual user testing of complete room system
+- [ ] Phase 6.11: Cross-browser testing (Chrome, Firefox, Safari)
+- [ ] Phase 6.12: Mobile responsiveness testing for room UI
+
+---
+
+## Notes
+
+- Total: 62 tasks across 6 phases
+- 20 dedicated testing tasks (32% of total)
+- Reference: `/Users/antialias/projects/soroban-abacus-flashcards/apps/web/docs/arcade-rooms-technical-plan.md`
+
+## Restoring TodoWrite
+
+To restore this list to TodoWrite format, convert each task to:
+```json
+{
+  "content": "Task description",
+  "status": "pending|in_progress|completed",
+  "activeForm": "Present continuous form (e.g., 'Creating...')"
+}
+```
--- a/apps/web/docs/arcade-rooms-technical-plan.md
+++ b/apps/web/docs/arcade-rooms-technical-plan.md
@@ -0,0 +1,895 @@
+# 🎮 Arcade Room System - Complete Technical Plan
+
+**Date:** 2025-01-06
+**Status:** Ready for Implementation
+
+## Executive Summary
+
+Transform the current singleton arcade session into a multi-room system where users can create, manage, and share public game rooms. Rooms are URL-addressable, support guest users, have configurable TTL, and give creators full moderation control.
+
+---
+
+## 1. Core Requirements
+
+### Room Features
+- ✅ **Public by default** - All rooms visible in public lobby
+- ✅ **No capacity limits** - Unlimited players per room
+- ✅ **Configurable TTL** - Rooms expire based on inactivity (similar to existing session TTL)
+- ✅ **URL-addressable** - Direct links to join rooms (`/arcade/rooms/{roomId}`)
+- ✅ **Guest access** - Unauthenticated users can join with temp guest IDs
+- ✅ **Anyone can create** - No authentication required to create rooms
+- ✅ **Creator moderation** - Only room creator can kick, lock, or delete room
+
+---
+
+## 2. Database Schema
+
+### New Tables
+
+```typescript
+// arcade_rooms table
+interface ArcadeRoom {
+  id: string                    // UUID - primary key
+  code: string                  // 6-char join code (e.g., "ABC123") - unique
+  name: string                  // User-defined room name (max 50 chars)
+
+  // Creator info
+  createdBy: string             // User/guest ID of creator
+  creatorName: string           // Display name at creation time
+  createdAt: Date
+
+  // Lifecycle
+  lastActivity: Date            // Updated on any room activity
+  ttlMinutes: number            // Time to live in minutes (default: 60)
+  isLocked: boolean             // Creator can lock room (no new joins)
+
+  // Game configuration
+  gameName: string              // 'matching', 'complement-race', etc.
+  gameConfig: JSON              // Game-specific settings (difficulty, etc.)
+
+  // Current state
+  status: 'lobby' | 'playing' | 'finished'
+  currentSessionId: string | null // FK to arcade_sessions (when game active)
+
+  // Metadata
+  totalGamesPlayed: number      // Track room usage
+}
+
+// room_members table
+interface RoomMember {
+  id: string                    // UUID - primary key
+  roomId: string                // FK to arcade_rooms - indexed
+  userId: string                // User/guest ID - indexed
+  displayName: string           // Name shown in room
+  isCreator: boolean            // True for room creator
+  joinedAt: Date
+  lastSeen: Date                // Updated on any activity
+  isOnline: boolean             // Currently connected via socket
+}
+
+// Modify existing: arcade_sessions
+interface ArcadeSession {
+  id: string
+  userId: string
+  // ... existing fields
+  roomId: string | null         // FK to arcade_rooms (null for solo play)
+  // When roomId is set, session is shared across room members
+}
+```
+
+### Indexes
+```sql
+CREATE INDEX idx_rooms_code ON arcade_rooms(code);
+CREATE INDEX idx_rooms_status ON arcade_rooms(status);
+CREATE INDEX idx_rooms_last_activity ON arcade_rooms(lastActivity);
+CREATE INDEX idx_room_members_room_id ON room_members(roomId);
+CREATE INDEX idx_room_members_user_id ON room_members(userId);
+CREATE INDEX idx_room_members_online ON room_members(isOnline) WHERE isOnline = true;
+```
+
+---
+
+## 3. API Endpoints
+
+### Room CRUD (`/api/arcade/rooms`)
+
+```typescript
+// Create room
+POST /api/arcade/rooms
+Body: {
+  name: string              // Room name
+  gameName: string          // Which game
+  gameConfig?: object       // Game settings
+  ttlMinutes?: number       // Default: 60
+  creatorName: string       // Display name
+}
+Response: {
+  room: ArcadeRoom
+  joinUrl: string           // Full URL to share
+}
+
+// Get room details
+GET /api/arcade/rooms/:roomId
+Response: {
+  room: ArcadeRoom
+  members: RoomMember[]
+  canModerate: boolean      // True if requester is creator
+}
+
+// Update room (creator only)
+PATCH /api/arcade/rooms/:roomId
+Body: {
+  name?: string
+  isLocked?: boolean
+  ttlMinutes?: number
+}
+Response: { room: ArcadeRoom }
+
+// Delete room (creator only)
+DELETE /api/arcade/rooms/:roomId
+Response: { success: boolean }
+
+// Join room by code
+GET /api/arcade/rooms/join/:code
+Response: {
+  roomId: string
+  redirectUrl: string
+}
+```
+
+### Room Discovery
+
+```typescript
+// Public room lobby (list all active rooms)
+GET /api/arcade/rooms/lobby
+Query: {
+  gameName?: string         // Filter by game
+  status?: string           // Filter by status
+  limit?: number            // Default: 50
+  offset?: number
+}
+Response: {
+  rooms: Array<{
+    id: string
+    name: string
+    code: string
+    gameName: string
+    status: string
+    memberCount: number
+    createdAt: Date
+    creatorName: string
+  }>
+  total: number
+}
+
+// Get user's rooms (all rooms user has joined)
+GET /api/arcade/rooms/my-rooms
+Query: { userId: string }
+Response: {
+  rooms: Array<RoomWithMemberInfo>
+}
+```
+
+### Room Membership
+
+```typescript
+// Join room
+POST /api/arcade/rooms/:roomId/join
+Body: {
+  userId: string            // User or guest ID
+  displayName: string
+}
+Response: {
+  member: RoomMember
+  room: ArcadeRoom
+}
+
+// Leave room
+POST /api/arcade/rooms/:roomId/leave
+Body: { userId: string }
+Response: { success: boolean }
+
+// Get members
+GET /api/arcade/rooms/:roomId/members
+Response: {
+  members: RoomMember[]
+  onlineCount: number
+}
+
+// Kick member (creator only)
+DELETE /api/arcade/rooms/:roomId/members/:userId
+Response: { success: boolean }
+```
+
+### Room Game Session
+
+```typescript
+// Start game in room
+POST /api/arcade/rooms/:roomId/start-game
+Body: {
+  initiatedBy: string       // Must be room member
+  activePlayers: string[]   // Subset of room members
+}
+Response: {
+  sessionId: string
+  gameState: any
+}
+
+// End game (return to lobby)
+POST /api/arcade/rooms/:roomId/end-game
+Body: { initiatedBy: string }
+Response: { success: boolean }
+```
+
+---
+
+## 4. WebSocket Protocol
+
+### Socket.IO Room Namespacing
+
+```typescript
+// Join room's socket.io room
+socket.emit('join-room', {
+  roomId: string
+  userId: string
+})
+
+// Leave room
+socket.emit('leave-room', {
+  roomId: string
+  userId: string
+})
+
+// Update member presence
+socket.emit('update-presence', {
+  roomId: string
+  userId: string
+  isOnline: boolean
+})
+```
+
+### Server → Client Events (room-scoped broadcasts)
+
+```typescript
+// Room state changes
+socket.on('room-updated', {
+  room: ArcadeRoom
+})
+
+// Member events
+socket.on('member-joined', {
+  member: RoomMember
+  memberCount: number
+})
+
+socket.on('member-left', {
+  userId: string
+  memberCount: number
+})
+
+socket.on('member-kicked', {
+  kickedUserId: string
+  reason: string
+})
+
+socket.on('members-updated', {
+  members: RoomMember[]
+})
+
+// Game session events
+socket.on('game-starting', {
+  sessionId: string
+  activePlayers: string[]
+})
+
+socket.on('game-ended', {
+  results: any
+})
+
+// Room lifecycle
+socket.on('room-locked', {
+  isLocked: boolean
+})
+
+socket.on('room-deleted', {
+  reason: string
+})
+
+// Existing game moves (now room-scoped)
+socket.on('game-move', { roomId, userId, move })
+socket.on('move-accepted', { roomId, gameState, version })
+socket.on('move-rejected', { roomId, error })
+```
+
+---
+
+## 5. URL Structure & Routing
+
+### New Routes
+
+```typescript
+/arcade/rooms                           // Public room lobby (list all rooms)
+/arcade/rooms/create                    // Create room modal/page
+/arcade/rooms/:roomId                   // Room lobby (pre-game)
+/arcade/rooms/:roomId/matching          // Game with room context
+/arcade/rooms/:roomId/complement-race   // Another game
+/arcade/join/:code                      // Short link: redirects to room
+
+// Existing routes (backward compatible)
+/arcade                                 // My rooms + quick play
+/arcade/matching                        // Solo play (no room)
+```
+
+### Navigation Flow
+
+```
+User Journey A: Create Room
+1. /arcade → Click "Create Room"
+2. /arcade/rooms/create → Fill form, submit
+3. /arcade/rooms/{roomId} → Room lobby, share link
+4. Click "Start Game" → /arcade/rooms/{roomId}/matching
+
+User Journey B: Join via Link
+1. Receive link: example.com/arcade/rooms/{roomId}
+2. Opens lobby, automatically joins
+3. Wait for game start or click ready
+
+User Journey C: Join via Code
+1. /arcade → Click "Join Room", enter ABC123
+2. Resolves code → /arcade/rooms/{roomId}
+3. Join and wait
+
+User Journey D: Browse Lobby
+1. /arcade/rooms → See public room list
+2. Click room → /arcade/rooms/{roomId}
+3. Join and play
+```
+
+---
+
+## 6. UI Components Architecture
+
+### Component Hierarchy
+
+```
+/src/components/arcade/rooms/
+├── RoomLobbyBrowser.tsx           // Public room list (/arcade/rooms)
+│   ├── RoomCard.tsx               // Individual room preview
+│   └── RoomFilters.tsx            // Filter by game, status
+│
+├── RoomLobby.tsx                  // Pre-game lobby (/arcade/rooms/:roomId)
+│   ├── RoomHeader.tsx             // Room name, code, share button
+│   ├── RoomMemberList.tsx         // Online members
+│   ├── RoomSettings.tsx           // Creator-only settings
+│   └── RoomActions.tsx            // Start game, leave, etc.
+│
+├── CreateRoomDialog.tsx           // Room creation modal
+│   ├── GameSelector.tsx           // Choose game type
+│   ├── RoomNameInput.tsx          // Name the room
+│   └── AdvancedSettings.tsx       // TTL, etc.
+│
+├── JoinRoomDialog.tsx             // Join by code modal
+├── RoomContextIndicator.tsx       // Shows room info during game
+│   └── RoomMemberAvatars.tsx      // Small member list
+│
+└── RoomModeration.tsx             // Creator controls (kick, lock, delete)
+```
+
+### Navigation Updates
+
+```typescript
+// Update GameContextNav.tsx
+interface GameContextNavProps {
+  // ... existing props
+  roomContext?: {
+    roomId: string
+    roomName: string
+    roomCode: string
+    memberCount: number
+    isCreator: boolean
+  }
+}
+
+// Shows in nav during room gameplay:
+// [🏠 Friday Night (ABC123) • 5 players ▼]
+```
+
+---
+
+## 7. State Management
+
+### New Hooks
+
+```typescript
+// useArcadeRoom.ts - Room state and membership
+export function useArcadeRoom(roomId: string) {
+  return {
+    room: ArcadeRoom | null
+    members: RoomMember[]
+    isCreator: boolean
+    isOnline: boolean
+    joinRoom: (displayName: string) => Promise<void>
+    leaveRoom: () => Promise<void>
+    updateRoom: (updates: Partial<ArcadeRoom>) => Promise<void>
+    deleteRoom: () => Promise<void>
+    kickMember: (userId: string) => Promise<void>
+    startGame: (activePlayers: string[]) => Promise<void>
+    endGame: () => Promise<void>
+  }
+}
+
+// useRoomMembers.ts - Real-time member presence
+export function useRoomMembers(roomId: string) {
+  return {
+    members: RoomMember[]
+    onlineMembers: RoomMember[]
+    onlineCount: number
+    updatePresence: (isOnline: boolean) => void
+  }
+}
+
+// useRoomLobby.ts - Public room discovery
+export function useRoomLobby(filters?: RoomFilters) {
+  return {
+    rooms: RoomPreview[]
+    loading: boolean
+    refresh: () => void
+    loadMore: () => void
+  }
+}
+
+// Update useArcadeSession.ts
+export function useArcadeSession<TState>(options: {
+  userId: string
+  roomId?: string  // NEW: optional room context
+  // ... existing options
+}) {
+  // If roomId provided, session is room-scoped
+  // All moves broadcast to room members
+}
+```
+
+---
+
+## 8. Server Implementation
+
+### New Files
+
+```
+/src/lib/arcade/
+├── room-manager.ts              # Core room operations
+│   ├── createRoom()
+│   ├── getRoomById()
+│   ├── updateRoom()
+│   ├── deleteRoom()
+│   ├── getRoomByCode()
+│   └── getPublicRooms()
+│
+├── room-membership.ts           # Member management
+│   ├── joinRoom()
+│   ├── leaveRoom()
+│   ├── kickMember()
+│   ├── getRoomMembers()
+│   └── updateMemberPresence()
+│
+├── room-validation.ts           # Access control
+│   ├── canModerateRoom()
+│   ├── canJoinRoom()
+│   ├── canStartGame()
+│   └── validateRoomName()
+│
+├── room-ttl.ts                  # TTL management (reuse existing pattern)
+│   ├── scheduleRoomCleanup()
+│   ├── updateRoomActivity()
+│   └── cleanupExpiredRooms()
+│
+└── session-manager.ts           # Update for room support
+    └── createArcadeSession() - accept roomId param
+```
+
+### Socket Server Updates
+
+```typescript
+// socket-server.ts modifications
+
+io.on('connection', (socket) => {
+
+  // Join room (socket.io namespace)
+  socket.on('join-room', async ({ roomId, userId }) => {
+    // Validate membership
+    const member = await getRoomMember(roomId, userId)
+    if (!member) {
+      socket.emit('room-error', { error: 'Not a room member' })
+      return
+    }
+
+    // Join socket.io room
+    socket.join(`room:${roomId}`)
+
+    // Update presence
+    await updateMemberPresence(roomId, userId, true)
+
+    // Broadcast to room
+    io.to(`room:${roomId}`).emit('member-joined', { member })
+
+    // Send current state
+    const room = await getRoomById(roomId)
+    const members = await getRoomMembers(roomId)
+    socket.emit('room-state', { room, members })
+  })
+
+  // Leave room
+  socket.on('leave-room', async ({ roomId, userId }) => {
+    socket.leave(`room:${roomId}`)
+    await updateMemberPresence(roomId, userId, false)
+    io.to(`room:${roomId}`).emit('member-left', { userId })
+  })
+
+  // Game moves (room-scoped)
+  socket.on('game-move', async ({ roomId, userId, move }) => {
+    // Validate room membership
+    const member = await getRoomMember(roomId, userId)
+    if (!member) return
+
+    // Apply move to room's session
+    const result = await applyGameMove(userId, move, roomId)
+
+    if (result.success) {
+      // Broadcast to all room members
+      io.to(`room:${roomId}`).emit('move-accepted', {
+        gameState: result.session.gameState,
+        version: result.session.version,
+        move
+      })
+    }
+  })
+
+  // Disconnect handling
+  socket.on('disconnect', () => {
+    // Update presence for all rooms user was in
+    updateAllUserPresence(userId, false)
+  })
+})
+```
+
+---
+
+## 9. Guest User System
+
+### Guest ID Generation
+
+```typescript
+// /src/lib/guest-id.ts
+
+export function generateGuestId(): string {
+  // Format: guest_{timestamp}_{random}
+  // Example: guest_1704556800000_a3f2e1
+  const timestamp = Date.now()
+  const random = Math.random().toString(36).substring(2, 8)
+  return `guest_${timestamp}_${random}`
+}
+
+export function isGuestId(userId: string): boolean {
+  return userId.startsWith('guest_')
+}
+
+export function getGuestDisplayName(guestId: string): string {
+  // Generate friendly name like "Guest 1234"
+  const hash = guestId.split('_')[2]
+  const num = parseInt(hash, 36) % 10000
+  return `Guest ${num}`
+}
+```
+
+### Guest Session Storage
+
+```typescript
+// Store guest ID in localStorage
+const GUEST_ID_KEY = 'soroban_guest_id'
+
+export function getOrCreateGuestId(): string {
+  let guestId = localStorage.getItem(GUEST_ID_KEY)
+  if (!guestId) {
+    guestId = generateGuestId()
+    localStorage.setItem(GUEST_ID_KEY, guestId)
+  }
+  return guestId
+}
+```
+
+---
+
+## 10. TTL Implementation
+
+### Reuse Existing Session TTL Pattern
+
+```typescript
+// room-ttl.ts
+
+const DEFAULT_ROOM_TTL_MINUTES = 60
+
+// Cleanup job (run every 5 minutes)
+setInterval(async () => {
+  await cleanupExpiredRooms()
+}, 5 * 60 * 1000)
+
+async function cleanupExpiredRooms() {
+  const now = new Date()
+
+  // Find expired rooms
+  const expiredRooms = await db.query(`
+    SELECT id FROM arcade_rooms
+    WHERE status != 'playing'
+    AND lastActivity < NOW() - INTERVAL '1 minute' * ttlMinutes
+  `)
+
+  for (const room of expiredRooms) {
+    // Notify members
+    io.to(`room:${room.id}`).emit('room-deleted', {
+      reason: 'Room expired due to inactivity'
+    })
+
+    // Delete room and members
+    await deleteRoom(room.id)
+  }
+}
+
+// Update activity on any room action
+export async function touchRoom(roomId: string) {
+  await db.query(`
+    UPDATE arcade_rooms
+    SET lastActivity = NOW()
+    WHERE id = $1
+  `, [roomId])
+}
+```
+
+---
+
+## 11. Room Code Generation
+
+```typescript
+// /src/lib/arcade/room-code.ts
+
+const CODE_CHARS = 'ABCDEFGHJKLMNPQRSTUVWXYZ23456789' // No ambiguous chars
+const CODE_LENGTH = 6
+
+export async function generateUniqueRoomCode(): Promise<string> {
+  let attempts = 0
+  const maxAttempts = 10
+
+  while (attempts < maxAttempts) {
+    const code = generateCode()
+    const existing = await getRoomByCode(code)
+    if (!existing) return code
+    attempts++
+  }
+
+  throw new Error('Failed to generate unique room code')
+}
+
+function generateCode(): string {
+  let code = ''
+  for (let i = 0; i < CODE_LENGTH; i++) {
+    const idx = Math.floor(Math.random() * CODE_CHARS.length)
+    code += CODE_CHARS[idx]
+  }
+  return code
+}
+```
+
+---
+
+## 12. Migration Plan
+
+### Phase 1: Database & API Foundation (Day 1-2)
+1. Create database tables and indexes
+2. Implement room-manager.ts and room-membership.ts
+3. Build API endpoints
+4. Add room-code generation
+5. Implement TTL cleanup
+6. Write unit tests
+
+### Phase 2: Socket.IO Integration (Day 2-3)
+1. Update socket-server.ts for room namespacing
+2. Implement room-scoped broadcasts
+3. Add presence tracking
+4. Update session-manager.ts for roomId support
+5. Test multi-user room sessions
+
+### Phase 3: Guest User System (Day 3)
+1. Implement guest ID generation
+2. Add guest user hooks
+3. Update auth flow for optional guest access
+4. Test guest join/leave flow
+
+### Phase 4: UI Components (Day 4-5)
+1. Build CreateRoomDialog
+2. Build RoomLobby component
+3. Build RoomLobbyBrowser (public lobby)
+4. Add RoomContextIndicator to nav
+5. Wire up all hooks
+
+### Phase 5: Routes & Navigation (Day 5-6)
+1. Create /arcade/rooms routes
+2. Update arcade home for room access
+3. Add room selector to nav
+4. Implement join-by-code flow
+5. Add share room functionality
+
+### Phase 6: Testing & Polish (Day 6-7)
+1. E2E tests for room creation/join
+2. Multi-user gameplay tests
+3. TTL and cleanup tests
+4. Guest user flow tests
+5. Performance testing
+6. UI polish and error states
+
+---
+
+## 13. Backward Compatibility
+
+### Solo Play Preserved
+- Existing `/arcade/matching` routes work unchanged
+- `roomId = null` for solo sessions
+- No breaking changes to `useArcadeSession`
+- All current functionality remains intact
+
+### Migration Strategy
+- Add `roomId` column to `arcade_sessions` (nullable)
+- Existing sessions have `roomId = null`
+- New room-based sessions have `roomId` populated
+- Session logic checks: `if (roomId) { /* room mode */ }`
+
+---
+
+## 14. Security Considerations
+
+### Room Access
+- ✅ Validate room membership before allowing game moves
+- ✅ Check `isCreator` flag for moderation actions
+- ✅ Prevent joining locked rooms
+- ✅ Rate limit room creation per IP/user
+- ✅ Sanitize room names (max length, no XSS)
+
+### Guest Users
+- ✅ Guest IDs stored client-side only (localStorage)
+- ✅ No sensitive data in guest profiles
+- ✅ Guest names sanitized
+- ✅ Rate limit guest actions
+- ✅ Allow authenticated users to "claim" guest activity
+
+### Room Moderation
+- ✅ Only creator can kick/lock/delete
+- ✅ Kicked users cannot rejoin unless creator unlocks
+- ✅ Room deletion clears all associated data
+- ✅ Audit log for moderation actions
+
+---
+
+## 15. Testing Strategy
+
+### Unit Tests
+- Room CRUD operations
+- Member join/leave logic
+- Code generation uniqueness
+- TTL cleanup
+- Guest ID generation
+- Access control validation
+
+### Integration Tests
+- Full room creation → join → play → leave flow
+- Multi-user concurrent gameplay
+- Socket.IO room broadcasts
+- Session synchronization across tabs
+- TTL expiration and cleanup
+
+### E2E Tests (Playwright)
+- Create room → share link → join as guest
+- Browse lobby → join room → play game
+- Creator kicks member
+- Room locks and unlock
+- Room TTL expiration
+
+### Load Tests
+- 100+ concurrent rooms
+- 10+ players per room
+- Rapid join/leave cycles
+- Socket.IO message throughput
+
+---
+
+## 16. Performance Optimizations
+
+### Database
+- Index on `room_members.roomId` for fast member queries
+- Index on `arcade_rooms.code` for quick code lookups
+- Index on `room_members.isOnline` for presence queries
+- Partition `arcade_rooms` by `createdAt` for TTL cleanup
+
+### Caching
+- Cache active room list (1-minute TTL)
+- Cache room member counts
+- Redis pub/sub for cross-server socket broadcasts (future)
+
+### Socket.IO
+- Use socket.io rooms for efficient broadcasting
+- Batch presence updates (debounce member online status)
+- Compress socket messages for large game states
+
+---
+
+## 17. Future Enhancements (Post-MVP)
+
+1. **Room Templates** - Save room configurations
+2. **Private Rooms** - Invite-only with passwords
+3. **Room Chat** - Text chat in lobby
+4. **Spectator Mode** - Watch games without playing
+5. **Room History** - Past games and stats
+6. **Tournament Brackets** - Multi-round competitions
+7. **Room Search** - Search by name/tag
+8. **Room Tags** - Categorize rooms
+9. **Friend Integration** - Invite friends directly
+10. **Room Analytics** - Popular times, average players, etc.
+
+---
+
+## 18. Open Questions / Decisions Needed
+
+1. **Room Name Validation** - Max length? Profanity filter?
+2. **Default TTL** - 60 minutes good default?
+3. **Code Reuse** - Can codes be reused after room expires?
+4. **Member Limit** - Even though unlimited, warn at certain threshold?
+5. **Lobby Pagination** - How many rooms to show initially?
+
+---
+
+## 19. Success Metrics
+
+- ✅ Users can create and join rooms
+- ✅ Guest users can participate without auth
+- ✅ Multi-user gameplay synchronized across all room members
+- ✅ Room creators can moderate effectively
+- ✅ Rooms expire correctly based on TTL
+- ✅ Public lobby shows active rooms
+- ✅ No regressions in solo play mode
+- ✅ All tests passing (unit, integration, e2e)
+
+---
+
+## 20. Dependencies
+
+### Existing Systems to Leverage
+- ✅ Current arcade session management
+- ✅ Existing WebSocket infrastructure (socket-server.ts)
+- ✅ Database setup (PostgreSQL)
+- ✅ Guest player system (from GameModeContext)
+
+### New Dependencies (if needed)
+- None! All can be built with existing stack
+
+---
+
+## Implementation Checklist
+
+- [ ] Create database migration
+- [ ] Implement room-manager.ts
+- [ ] Implement room-membership.ts
+- [ ] Build API endpoints
+- [ ] Add room code generation
+- [ ] Update socket-server.ts
+- [ ] Implement guest ID system
+- [ ] Build CreateRoomDialog
+- [ ] Build RoomLobby component
+- [ ] Build RoomLobbyBrowser
+- [ ] Add room routes
+- [ ] Update navigation
+- [ ] Write unit tests
+- [ ] Write integration tests
+- [ ] Write e2e tests
+- [ ] Documentation
+- [ ] Deploy
+
+---
+
+**Ready to implement! 🚀**
--- a/apps/web/drizzle.config.ts
+++ b/apps/web/drizzle.config.ts
@@ -0,0 +1,12 @@
+import type { Config } from 'drizzle-kit'
+
+export default {
+  schema: './src/db/schema/index.ts',
+  out: './drizzle',
+  dialect: 'sqlite',
+  dbCredentials: {
+    url: process.env.DATABASE_URL || './data/sqlite.db',
+  },
+  verbose: true,
+  strict: true,
+} satisfies Config
--- a/apps/web/drizzle/0000_third_carnage.sql
+++ b/apps/web/drizzle/0000_third_carnage.sql
@@ -0,0 +1,32 @@
+CREATE TABLE `users` (
+	`id` text PRIMARY KEY NOT NULL,
+	`guest_id` text NOT NULL,
+	`created_at` integer NOT NULL,
+	`upgraded_at` integer,
+	`email` text,
+	`name` text
+);
+--> statement-breakpoint
+CREATE UNIQUE INDEX `users_guest_id_unique` ON `users` (`guest_id`);--> statement-breakpoint
+CREATE UNIQUE INDEX `users_email_unique` ON `users` (`email`);--> statement-breakpoint
+CREATE TABLE `players` (
+	`id` text PRIMARY KEY NOT NULL,
+	`user_id` text NOT NULL,
+	`name` text NOT NULL,
+	`emoji` text NOT NULL,
+	`color` text NOT NULL,
+	`is_active` integer DEFAULT false NOT NULL,
+	`created_at` integer NOT NULL,
+	FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+CREATE INDEX `players_user_id_idx` ON `players` (`user_id`);--> statement-breakpoint
+CREATE TABLE `user_stats` (
+	`user_id` text PRIMARY KEY NOT NULL,
+	`games_played` integer DEFAULT 0 NOT NULL,
+	`total_wins` integer DEFAULT 0 NOT NULL,
+	`favorite_game_type` text,
+	`best_time` integer,
+	`highest_accuracy` real DEFAULT 0 NOT NULL,
+	FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON UPDATE no action ON DELETE cascade
+);
--- a/apps/web/drizzle/0001_friendly_stingray.sql
+++ b/apps/web/drizzle/0001_friendly_stingray.sql
@@ -0,0 +1,16 @@
+CREATE TABLE `abacus_settings` (
+	`user_id` text PRIMARY KEY NOT NULL,
+	`color_scheme` text DEFAULT 'place-value' NOT NULL,
+	`bead_shape` text DEFAULT 'diamond' NOT NULL,
+	`color_palette` text DEFAULT 'default' NOT NULL,
+	`hide_inactive_beads` integer DEFAULT false NOT NULL,
+	`colored_numerals` integer DEFAULT false NOT NULL,
+	`scale_factor` real DEFAULT 1 NOT NULL,
+	`show_numbers` integer DEFAULT true NOT NULL,
+	`animated` integer DEFAULT true NOT NULL,
+	`interactive` integer DEFAULT false NOT NULL,
+	`gestures` integer DEFAULT false NOT NULL,
+	`sound_enabled` integer DEFAULT true NOT NULL,
+	`sound_volume` real DEFAULT 0.8 NOT NULL,
+	FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON UPDATE no action ON DELETE cascade
+);
--- a/apps/web/drizzle/0002_loose_ultimatum.sql
+++ b/apps/web/drizzle/0002_loose_ultimatum.sql
@@ -0,0 +1,13 @@
+CREATE TABLE `arcade_sessions` (
+	`user_id` text PRIMARY KEY NOT NULL,
+	`current_game` text NOT NULL,
+	`game_url` text NOT NULL,
+	`game_state` text NOT NULL,
+	`active_players` text NOT NULL,
+	`started_at` integer NOT NULL,
+	`last_activity_at` integer NOT NULL,
+	`expires_at` integer NOT NULL,
+	`is_active` integer DEFAULT true NOT NULL,
+	`version` integer DEFAULT 1 NOT NULL,
+	FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON UPDATE no action ON DELETE cascade
+);
--- a/apps/web/drizzle/0003_naive_reptil.sql
+++ b/apps/web/drizzle/0003_naive_reptil.sql
@@ -0,0 +1,31 @@
+CREATE TABLE `arcade_rooms` (
+	`id` text PRIMARY KEY NOT NULL,
+	`code` text(6) NOT NULL,
+	`name` text(50) NOT NULL,
+	`created_by` text NOT NULL,
+	`creator_name` text(50) NOT NULL,
+	`created_at` integer NOT NULL,
+	`last_activity` integer NOT NULL,
+	`ttl_minutes` integer DEFAULT 60 NOT NULL,
+	`is_locked` integer DEFAULT false NOT NULL,
+	`game_name` text NOT NULL,
+	`game_config` text NOT NULL,
+	`status` text DEFAULT 'lobby' NOT NULL,
+	`current_session_id` text,
+	`total_games_played` integer DEFAULT 0 NOT NULL
+);
+--> statement-breakpoint
+CREATE UNIQUE INDEX `arcade_rooms_code_unique` ON `arcade_rooms` (`code`);--> statement-breakpoint
+CREATE TABLE `room_members` (
+	`id` text PRIMARY KEY NOT NULL,
+	`room_id` text NOT NULL,
+	`user_id` text NOT NULL,
+	`display_name` text(50) NOT NULL,
+	`is_creator` integer DEFAULT false NOT NULL,
+	`joined_at` integer NOT NULL,
+	`last_seen` integer NOT NULL,
+	`is_online` integer DEFAULT true NOT NULL,
+	FOREIGN KEY (`room_id`) REFERENCES `arcade_rooms`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+ALTER TABLE `arcade_sessions` ADD `room_id` text REFERENCES arcade_rooms(id);
--- a/apps/web/drizzle/meta/0000_snapshot.json
+++ b/apps/web/drizzle/meta/0000_snapshot.json
@@ -0,0 +1,222 @@
+{
+  "version": "6",
+  "dialect": "sqlite",
+  "id": "949424bf-1933-497c-af2d-cab6ee81083d",
+  "prevId": "00000000-0000-0000-0000-000000000000",
+  "tables": {
+    "users": {
+      "name": "users",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "guest_id": {
+          "name": "guest_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "upgraded_at": {
+          "name": "upgraded_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "email": {
+          "name": "email",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "name": {
+          "name": "name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        }
+      },
+      "indexes": {
+        "users_guest_id_unique": {
+          "name": "users_guest_id_unique",
+          "columns": ["guest_id"],
+          "isUnique": true
+        },
+        "users_email_unique": {
+          "name": "users_email_unique",
+          "columns": ["email"],
+          "isUnique": true
+        }
+      },
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "players": {
+      "name": "players",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "name": {
+          "name": "name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "emoji": {
+          "name": "emoji",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "color": {
+          "name": "color",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "is_active": {
+          "name": "is_active",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        }
+      },
+      "indexes": {
+        "players_user_id_idx": {
+          "name": "players_user_id_idx",
+          "columns": ["user_id"],
+          "isUnique": false
+        }
+      },
+      "foreignKeys": {
+        "players_user_id_users_id_fk": {
+          "name": "players_user_id_users_id_fk",
+          "tableFrom": "players",
+          "tableTo": "users",
+          "columnsFrom": ["user_id"],
+          "columnsTo": ["id"],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "user_stats": {
+      "name": "user_stats",
+      "columns": {
+        "user_id": {
+          "name": "user_id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "games_played": {
+          "name": "games_played",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0
+        },
+        "total_wins": {
+          "name": "total_wins",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0
+        },
+        "favorite_game_type": {
+          "name": "favorite_game_type",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "best_time": {
+          "name": "best_time",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "highest_accuracy": {
+          "name": "highest_accuracy",
+          "type": "real",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "user_stats_user_id_users_id_fk": {
+          "name": "user_stats_user_id_users_id_fk",
+          "tableFrom": "user_stats",
+          "tableTo": "users",
+          "columnsFrom": ["user_id"],
+          "columnsTo": ["id"],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    }
+  },
+  "views": {},
+  "enums": {},
+  "_meta": {
+    "schemas": {},
+    "tables": {},
+    "columns": {}
+  },
+  "internal": {
+    "indexes": {}
+  }
+}
--- a/apps/web/drizzle/meta/0001_snapshot.json
+++ b/apps/web/drizzle/meta/0001_snapshot.json
@@ -0,0 +1,345 @@
+{
+  "version": "6",
+  "dialect": "sqlite",
+  "id": "25d98633-0bae-4f6e-845b-ed87f53fc233",
+  "prevId": "949424bf-1933-497c-af2d-cab6ee81083d",
+  "tables": {
+    "users": {
+      "name": "users",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "guest_id": {
+          "name": "guest_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "upgraded_at": {
+          "name": "upgraded_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "email": {
+          "name": "email",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "name": {
+          "name": "name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        }
+      },
+      "indexes": {
+        "users_guest_id_unique": {
+          "name": "users_guest_id_unique",
+          "columns": ["guest_id"],
+          "isUnique": true
+        },
+        "users_email_unique": {
+          "name": "users_email_unique",
+          "columns": ["email"],
+          "isUnique": true
+        }
+      },
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "players": {
+      "name": "players",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "name": {
+          "name": "name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "emoji": {
+          "name": "emoji",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "color": {
+          "name": "color",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "is_active": {
+          "name": "is_active",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        }
+      },
+      "indexes": {
+        "players_user_id_idx": {
+          "name": "players_user_id_idx",
+          "columns": ["user_id"],
+          "isUnique": false
+        }
+      },
+      "foreignKeys": {
+        "players_user_id_users_id_fk": {
+          "name": "players_user_id_users_id_fk",
+          "tableFrom": "players",
+          "tableTo": "users",
+          "columnsFrom": ["user_id"],
+          "columnsTo": ["id"],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "user_stats": {
+      "name": "user_stats",
+      "columns": {
+        "user_id": {
+          "name": "user_id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "games_played": {
+          "name": "games_played",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0
+        },
+        "total_wins": {
+          "name": "total_wins",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0
+        },
+        "favorite_game_type": {
+          "name": "favorite_game_type",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "best_time": {
+          "name": "best_time",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "highest_accuracy": {
+          "name": "highest_accuracy",
+          "type": "real",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "user_stats_user_id_users_id_fk": {
+          "name": "user_stats_user_id_users_id_fk",
+          "tableFrom": "user_stats",
+          "tableTo": "users",
+          "columnsFrom": ["user_id"],
+          "columnsTo": ["id"],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "abacus_settings": {
+      "name": "abacus_settings",
+      "columns": {
+        "user_id": {
+          "name": "user_id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "color_scheme": {
+          "name": "color_scheme",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "'place-value'"
+        },
+        "bead_shape": {
+          "name": "bead_shape",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "'diamond'"
+        },
+        "color_palette": {
+          "name": "color_palette",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "'default'"
+        },
+        "hide_inactive_beads": {
+          "name": "hide_inactive_beads",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "colored_numerals": {
+          "name": "colored_numerals",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "scale_factor": {
+          "name": "scale_factor",
+          "type": "real",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 1
+        },
+        "show_numbers": {
+          "name": "show_numbers",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": true
+        },
+        "animated": {
+          "name": "animated",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": true
+        },
+        "interactive": {
+          "name": "interactive",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "gestures": {
+          "name": "gestures",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "sound_enabled": {
+          "name": "sound_enabled",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": true
+        },
+        "sound_volume": {
+          "name": "sound_volume",
+          "type": "real",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0.8
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "abacus_settings_user_id_users_id_fk": {
+          "name": "abacus_settings_user_id_users_id_fk",
+          "tableFrom": "abacus_settings",
+          "tableTo": "users",
+          "columnsFrom": ["user_id"],
+          "columnsTo": ["id"],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    }
+  },
+  "views": {},
+  "enums": {},
+  "_meta": {
+    "schemas": {},
+    "tables": {},
+    "columns": {}
+  },
+  "internal": {
+    "indexes": {}
+  }
+}
--- a/apps/web/drizzle/meta/0002_snapshot.json
+++ b/apps/web/drizzle/meta/0002_snapshot.json
@@ -0,0 +1,437 @@
+{
+  "version": "6",
+  "dialect": "sqlite",
+  "id": "194ccc68-7173-44c9-879a-55d20cf3ae1f",
+  "prevId": "25d98633-0bae-4f6e-845b-ed87f53fc233",
+  "tables": {
+    "users": {
+      "name": "users",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "guest_id": {
+          "name": "guest_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "upgraded_at": {
+          "name": "upgraded_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "email": {
+          "name": "email",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "name": {
+          "name": "name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        }
+      },
+      "indexes": {
+        "users_guest_id_unique": {
+          "name": "users_guest_id_unique",
+          "columns": ["guest_id"],
+          "isUnique": true
+        },
+        "users_email_unique": {
+          "name": "users_email_unique",
+          "columns": ["email"],
+          "isUnique": true
+        }
+      },
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "players": {
+      "name": "players",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "name": {
+          "name": "name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "emoji": {
+          "name": "emoji",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "color": {
+          "name": "color",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "is_active": {
+          "name": "is_active",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        }
+      },
+      "indexes": {
+        "players_user_id_idx": {
+          "name": "players_user_id_idx",
+          "columns": ["user_id"],
+          "isUnique": false
+        }
+      },
+      "foreignKeys": {
+        "players_user_id_users_id_fk": {
+          "name": "players_user_id_users_id_fk",
+          "tableFrom": "players",
+          "tableTo": "users",
+          "columnsFrom": ["user_id"],
+          "columnsTo": ["id"],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "user_stats": {
+      "name": "user_stats",
+      "columns": {
+        "user_id": {
+          "name": "user_id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "games_played": {
+          "name": "games_played",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0
+        },
+        "total_wins": {
+          "name": "total_wins",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0
+        },
+        "favorite_game_type": {
+          "name": "favorite_game_type",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "best_time": {
+          "name": "best_time",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "highest_accuracy": {
+          "name": "highest_accuracy",
+          "type": "real",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "user_stats_user_id_users_id_fk": {
+          "name": "user_stats_user_id_users_id_fk",
+          "tableFrom": "user_stats",
+          "tableTo": "users",
+          "columnsFrom": ["user_id"],
+          "columnsTo": ["id"],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "abacus_settings": {
+      "name": "abacus_settings",
+      "columns": {
+        "user_id": {
+          "name": "user_id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "color_scheme": {
+          "name": "color_scheme",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "'place-value'"
+        },
+        "bead_shape": {
+          "name": "bead_shape",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "'diamond'"
+        },
+        "color_palette": {
+          "name": "color_palette",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "'default'"
+        },
+        "hide_inactive_beads": {
+          "name": "hide_inactive_beads",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "colored_numerals": {
+          "name": "colored_numerals",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "scale_factor": {
+          "name": "scale_factor",
+          "type": "real",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 1
+        },
+        "show_numbers": {
+          "name": "show_numbers",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": true
+        },
+        "animated": {
+          "name": "animated",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": true
+        },
+        "interactive": {
+          "name": "interactive",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "gestures": {
+          "name": "gestures",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "sound_enabled": {
+          "name": "sound_enabled",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": true
+        },
+        "sound_volume": {
+          "name": "sound_volume",
+          "type": "real",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0.8
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "abacus_settings_user_id_users_id_fk": {
+          "name": "abacus_settings_user_id_users_id_fk",
+          "tableFrom": "abacus_settings",
+          "tableTo": "users",
+          "columnsFrom": ["user_id"],
+          "columnsTo": ["id"],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "arcade_sessions": {
+      "name": "arcade_sessions",
+      "columns": {
+        "user_id": {
+          "name": "user_id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "current_game": {
+          "name": "current_game",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "game_url": {
+          "name": "game_url",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "game_state": {
+          "name": "game_state",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "active_players": {
+          "name": "active_players",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "started_at": {
+          "name": "started_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "last_activity_at": {
+          "name": "last_activity_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "expires_at": {
+          "name": "expires_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "is_active": {
+          "name": "is_active",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": true
+        },
+        "version": {
+          "name": "version",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 1
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "arcade_sessions_user_id_users_id_fk": {
+          "name": "arcade_sessions_user_id_users_id_fk",
+          "tableFrom": "arcade_sessions",
+          "tableTo": "users",
+          "columnsFrom": ["user_id"],
+          "columnsTo": ["id"],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    }
+  },
+  "views": {},
+  "enums": {},
+  "_meta": {
+    "schemas": {},
+    "tables": {},
+    "columns": {}
+  },
+  "internal": {
+    "indexes": {}
+  }
+}
--- a/apps/web/drizzle/meta/0003_snapshot.json
+++ b/apps/web/drizzle/meta/0003_snapshot.json
@@ -0,0 +1,649 @@
+{
+  "version": "6",
+  "dialect": "sqlite",
+  "id": "68cc273f-0d84-4a46-ae41-124a3e06096b",
+  "prevId": "194ccc68-7173-44c9-879a-55d20cf3ae1f",
+  "tables": {
+    "users": {
+      "name": "users",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "guest_id": {
+          "name": "guest_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "upgraded_at": {
+          "name": "upgraded_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "email": {
+          "name": "email",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "name": {
+          "name": "name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        }
+      },
+      "indexes": {
+        "users_guest_id_unique": {
+          "name": "users_guest_id_unique",
+          "columns": ["guest_id"],
+          "isUnique": true
+        },
+        "users_email_unique": {
+          "name": "users_email_unique",
+          "columns": ["email"],
+          "isUnique": true
+        }
+      },
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "players": {
+      "name": "players",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "name": {
+          "name": "name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "emoji": {
+          "name": "emoji",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "color": {
+          "name": "color",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "is_active": {
+          "name": "is_active",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        }
+      },
+      "indexes": {
+        "players_user_id_idx": {
+          "name": "players_user_id_idx",
+          "columns": ["user_id"],
+          "isUnique": false
+        }
+      },
+      "foreignKeys": {
+        "players_user_id_users_id_fk": {
+          "name": "players_user_id_users_id_fk",
+          "tableFrom": "players",
+          "tableTo": "users",
+          "columnsFrom": ["user_id"],
+          "columnsTo": ["id"],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "user_stats": {
+      "name": "user_stats",
+      "columns": {
+        "user_id": {
+          "name": "user_id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "games_played": {
+          "name": "games_played",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0
+        },
+        "total_wins": {
+          "name": "total_wins",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0
+        },
+        "favorite_game_type": {
+          "name": "favorite_game_type",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "best_time": {
+          "name": "best_time",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "highest_accuracy": {
+          "name": "highest_accuracy",
+          "type": "real",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "user_stats_user_id_users_id_fk": {
+          "name": "user_stats_user_id_users_id_fk",
+          "tableFrom": "user_stats",
+          "tableTo": "users",
+          "columnsFrom": ["user_id"],
+          "columnsTo": ["id"],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "abacus_settings": {
+      "name": "abacus_settings",
+      "columns": {
+        "user_id": {
+          "name": "user_id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "color_scheme": {
+          "name": "color_scheme",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "'place-value'"
+        },
+        "bead_shape": {
+          "name": "bead_shape",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "'diamond'"
+        },
+        "color_palette": {
+          "name": "color_palette",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "'default'"
+        },
+        "hide_inactive_beads": {
+          "name": "hide_inactive_beads",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "colored_numerals": {
+          "name": "colored_numerals",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "scale_factor": {
+          "name": "scale_factor",
+          "type": "real",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 1
+        },
+        "show_numbers": {
+          "name": "show_numbers",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": true
+        },
+        "animated": {
+          "name": "animated",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": true
+        },
+        "interactive": {
+          "name": "interactive",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "gestures": {
+          "name": "gestures",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "sound_enabled": {
+          "name": "sound_enabled",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": true
+        },
+        "sound_volume": {
+          "name": "sound_volume",
+          "type": "real",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0.8
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "abacus_settings_user_id_users_id_fk": {
+          "name": "abacus_settings_user_id_users_id_fk",
+          "tableFrom": "abacus_settings",
+          "tableTo": "users",
+          "columnsFrom": ["user_id"],
+          "columnsTo": ["id"],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "arcade_rooms": {
+      "name": "arcade_rooms",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "code": {
+          "name": "code",
+          "type": "text(6)",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "name": {
+          "name": "name",
+          "type": "text(50)",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "created_by": {
+          "name": "created_by",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "creator_name": {
+          "name": "creator_name",
+          "type": "text(50)",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "last_activity": {
+          "name": "last_activity",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "ttl_minutes": {
+          "name": "ttl_minutes",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 60
+        },
+        "is_locked": {
+          "name": "is_locked",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "game_name": {
+          "name": "game_name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "game_config": {
+          "name": "game_config",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "status": {
+          "name": "status",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "'lobby'"
+        },
+        "current_session_id": {
+          "name": "current_session_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "total_games_played": {
+          "name": "total_games_played",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0
+        }
+      },
+      "indexes": {
+        "arcade_rooms_code_unique": {
+          "name": "arcade_rooms_code_unique",
+          "columns": ["code"],
+          "isUnique": true
+        }
+      },
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "room_members": {
+      "name": "room_members",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "room_id": {
+          "name": "room_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "display_name": {
+          "name": "display_name",
+          "type": "text(50)",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "is_creator": {
+          "name": "is_creator",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "joined_at": {
+          "name": "joined_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "last_seen": {
+          "name": "last_seen",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "is_online": {
+          "name": "is_online",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": true
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "room_members_room_id_arcade_rooms_id_fk": {
+          "name": "room_members_room_id_arcade_rooms_id_fk",
+          "tableFrom": "room_members",
+          "tableTo": "arcade_rooms",
+          "columnsFrom": ["room_id"],
+          "columnsTo": ["id"],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "arcade_sessions": {
+      "name": "arcade_sessions",
+      "columns": {
+        "user_id": {
+          "name": "user_id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "current_game": {
+          "name": "current_game",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "game_url": {
+          "name": "game_url",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "game_state": {
+          "name": "game_state",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "active_players": {
+          "name": "active_players",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "room_id": {
+          "name": "room_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "started_at": {
+          "name": "started_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "last_activity_at": {
+          "name": "last_activity_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "expires_at": {
+          "name": "expires_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "is_active": {
+          "name": "is_active",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": true
+        },
+        "version": {
+          "name": "version",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 1
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "arcade_sessions_user_id_users_id_fk": {
+          "name": "arcade_sessions_user_id_users_id_fk",
+          "tableFrom": "arcade_sessions",
+          "tableTo": "users",
+          "columnsFrom": ["user_id"],
+          "columnsTo": ["id"],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        },
+        "arcade_sessions_room_id_arcade_rooms_id_fk": {
+          "name": "arcade_sessions_room_id_arcade_rooms_id_fk",
+          "tableFrom": "arcade_sessions",
+          "tableTo": "arcade_rooms",
+          "columnsFrom": ["room_id"],
+          "columnsTo": ["id"],
+          "onDelete": "set null",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    }
+  },
+  "views": {},
+  "enums": {},
+  "_meta": {
+    "schemas": {},
+    "tables": {},
+    "columns": {}
+  },
+  "internal": {
+    "indexes": {}
+  }
+}
--- a/apps/web/drizzle/meta/_journal.json
+++ b/apps/web/drizzle/meta/_journal.json
@@ -0,0 +1,34 @@
+{
+  "version": "7",
+  "dialect": "sqlite",
+  "entries": [
+    {
+      "idx": 0,
+      "version": "6",
+      "when": 1759701472375,
+      "tag": "0000_third_carnage",
+      "breakpoints": true
+    },
+    {
+      "idx": 1,
+      "version": "6",
+      "when": 1759706755851,
+      "tag": "0001_friendly_stingray",
+      "breakpoints": true
+    },
+    {
+      "idx": 2,
+      "version": "6",
+      "when": 1759752980924,
+      "tag": "0002_loose_ultimatum",
+      "breakpoints": true
+    },
+    {
+      "idx": 3,
+      "version": "6",
+      "when": 1759781243105,
+      "tag": "0003_naive_reptil",
+      "breakpoints": true
+    }
+  ]
+}
--- a/apps/web/e2e/arcade-modal-session.spec.ts
+++ b/apps/web/e2e/arcade-modal-session.spec.ts
@@ -0,0 +1,338 @@
+import { expect, test } from '@playwright/test'
+
+/**
+ * Arcade Modal Session E2E Tests
+ *
+ * These tests verify that the arcade modal session system works correctly:
+ * - Users are locked into games once they start
+ * - Automatic redirects to active games
+ * - Player modification is blocked during games
+ * - "Return to Arcade" button properly ends sessions
+ */
+
+test.describe('Arcade Modal Session - Redirects', () => {
+  test.beforeEach(async ({ page }) => {
+    // Clear arcade session before each test
+    await page.goto('/arcade')
+    await page.waitForLoadState('networkidle')
+
+    // Click "Return to Arcade" button if it exists (to clear any existing session)
+    const returnButton = page.locator('button:has-text("Return to Arcade")')
+    if (await returnButton.isVisible({ timeout: 1000 }).catch(() => false)) {
+      await returnButton.click()
+      await page.waitForLoadState('networkidle')
+    }
+  })
+
+  test('should stay on arcade lobby when no active session', async ({ page }) => {
+    await page.goto('/arcade')
+    await page.waitForLoadState('networkidle')
+
+    // Should see "Champion Arena" title
+    const title = page.locator('h1:has-text("Champion Arena")')
+    await expect(title).toBeVisible()
+
+    // Should be able to select players
+    const playerSection = page.locator('text=/Player|Select|Add/i')
+    await expect(playerSection.first()).toBeVisible()
+  })
+
+  test('should redirect from arcade to active game when session exists', async ({ page }) => {
+    // Start a game to create a session
+    await page.goto('/arcade')
+    await page.waitForLoadState('networkidle')
+
+    // Find and click a player card to activate
+    const playerCard = page.locator('[data-testid="player-card"]').first()
+    if (await playerCard.isVisible({ timeout: 2000 }).catch(() => false)) {
+      await playerCard.click()
+      await page.waitForTimeout(500)
+    }
+
+    // Navigate to matching game to create session
+    await page.goto('/arcade/matching')
+    await page.waitForLoadState('networkidle')
+
+    // Start the game (click Start button if visible)
+    const startButton = page.locator('button:has-text("Start")')
+    if (await startButton.isVisible({ timeout: 2000 }).catch(() => false)) {
+      await startButton.click()
+      await page.waitForTimeout(1000)
+    }
+
+    // Try to navigate back to arcade lobby
+    await page.goto('/arcade')
+    await page.waitForTimeout(2000) // Give time for redirect
+
+    // Should be redirected back to the game
+    await expect(page).toHaveURL(/\/arcade\/matching/)
+    const gameTitle = page.locator('h1:has-text("Memory Pairs")')
+    await expect(gameTitle).toBeVisible()
+  })
+
+  test('should redirect to correct game when navigating to wrong game', async ({ page }) => {
+    // Create a session with matching game
+    await page.goto('/arcade')
+    await page.waitForLoadState('networkidle')
+
+    // Activate a player
+    const addPlayerButton = page.locator('button:has-text("Add Player"), button:has-text("+")')
+    if (
+      await addPlayerButton
+        .first()
+        .isVisible({ timeout: 2000 })
+        .catch(() => false)
+    ) {
+      await addPlayerButton.first().click()
+      await page.waitForTimeout(500)
+    }
+
+    // Go to matching game
+    await page.goto('/arcade/matching')
+    await page.waitForLoadState('networkidle')
+
+    // Start game if needed
+    const startButton = page.locator('button:has-text("Start")')
+    if (await startButton.isVisible({ timeout: 2000 }).catch(() => false)) {
+      await startButton.click()
+      await page.waitForTimeout(1000)
+    }
+
+    // Try to navigate to a different game
+    await page.goto('/arcade/memory-quiz')
+    await page.waitForTimeout(2000) // Give time for redirect
+
+    // Should be redirected back to matching
+    await expect(page).toHaveURL(/\/arcade\/matching/)
+  })
+
+  test('should NOT redirect when on correct game page', async ({ page }) => {
+    // Navigate to matching game
+    await page.goto('/arcade/matching')
+    await page.waitForLoadState('networkidle')
+
+    // Should stay on matching page
+    await expect(page).toHaveURL(/\/arcade\/matching/)
+    const gameTitle = page.locator('h1:has-text("Memory Pairs")')
+    await expect(gameTitle).toBeVisible()
+  })
+})
+
+test.describe('Arcade Modal Session - Player Modification Blocking', () => {
+  test.beforeEach(async ({ page }) => {
+    // Clear session
+    await page.goto('/arcade')
+    await page.waitForLoadState('networkidle')
+
+    const returnButton = page.locator('button:has-text("Return to Arcade")')
+    if (await returnButton.isVisible({ timeout: 1000 }).catch(() => false)) {
+      await returnButton.click()
+      await page.waitForLoadState('networkidle')
+    }
+  })
+
+  test('should allow player modification in arcade lobby with no session', async ({ page }) => {
+    await page.goto('/arcade')
+    await page.waitForLoadState('networkidle')
+
+    // Look for add player button (should be enabled)
+    const addPlayerButton = page.locator('button:has-text("Add Player"), button:has-text("+")')
+    const firstButton = addPlayerButton.first()
+
+    if (await firstButton.isVisible({ timeout: 2000 }).catch(() => false)) {
+      // Should be clickable
+      await expect(firstButton).toBeEnabled()
+
+      // Try to click it
+      await firstButton.click()
+      await page.waitForTimeout(500)
+
+      // Should see player added
+      const activePlayer = page.locator('[data-testid="active-player"]')
+      await expect(activePlayer.first()).toBeVisible({ timeout: 3000 })
+    }
+  })
+
+  test('should block player modification during active game', async ({ page }) => {
+    // Start a game
+    await page.goto('/arcade/matching')
+    await page.waitForLoadState('networkidle')
+
+    // Start game
+    const startButton = page.locator('button:has-text("Start")')
+    if (await startButton.isVisible({ timeout: 2000 }).catch(() => false)) {
+      await startButton.click()
+      await page.waitForTimeout(1000)
+    }
+
+    // Look for player modification controls
+    // They should be disabled or have reduced opacity
+    const playerControls = page.locator('[data-testid="player-controls"], .player-list')
+    if (await playerControls.isVisible({ timeout: 1000 }).catch(() => false)) {
+      // Check if controls have pointer-events: none or low opacity
+      const opacity = await playerControls.evaluate((el) => {
+        return window.getComputedStyle(el).opacity
+      })
+
+      // If controls are visible, they should be dimmed (opacity < 1)
+      if (parseFloat(opacity) < 1) {
+        expect(parseFloat(opacity)).toBeLessThan(1)
+      }
+    }
+
+    // "Add Player" button should not be visible during game
+    const addPlayerButton = page.locator('button:has-text("Add Player")')
+    if (await addPlayerButton.isVisible({ timeout: 500 }).catch(() => false)) {
+      // If visible, should be disabled
+      const isDisabled = await addPlayerButton.isDisabled()
+      expect(isDisabled).toBe(true)
+    }
+  })
+
+  test('should show "Return to Arcade" button during game', async ({ page }) => {
+    // Start a game
+    await page.goto('/arcade/matching')
+    await page.waitForLoadState('networkidle')
+
+    // Look for "Return to Arcade" button
+    const returnButton = page.locator('button:has-text("Return to Arcade")')
+
+    // During game setup, might see "Setup" button instead
+    const setupButton = page.locator('button:has-text("Setup")')
+
+    // One of these should be visible
+    const hasReturnButton = await returnButton.isVisible({ timeout: 2000 }).catch(() => false)
+    const hasSetupButton = await setupButton.isVisible({ timeout: 2000 }).catch(() => false)
+
+    expect(hasReturnButton || hasSetupButton).toBe(true)
+  })
+
+  test('should NOT show "Setup" button in arcade lobby with no session', async ({ page }) => {
+    await page.goto('/arcade')
+    await page.waitForLoadState('networkidle')
+
+    // Should NOT see "Return to Arcade" or "Setup" button in lobby
+    const returnButton = page.locator('button:has-text("Return to Arcade")')
+    const setupButton = page.locator('button:has-text("Setup")')
+
+    const hasReturnButton = await returnButton.isVisible({ timeout: 1000 }).catch(() => false)
+    const hasSetupButton = await setupButton.isVisible({ timeout: 1000 }).catch(() => false)
+
+    // Neither should be visible in empty lobby
+    expect(hasReturnButton).toBe(false)
+    expect(hasSetupButton).toBe(false)
+  })
+})
+
+test.describe('Arcade Modal Session - Return to Arcade Button', () => {
+  test.beforeEach(async ({ page }) => {
+    // Clear session
+    await page.goto('/arcade')
+    await page.waitForLoadState('networkidle')
+  })
+
+  test('should end session and return to arcade when clicking "Return to Arcade"', async ({
+    page,
+  }) => {
+    // Start a game
+    await page.goto('/arcade/matching')
+    await page.waitForLoadState('networkidle')
+
+    // Start game if needed
+    const startButton = page.locator('button:has-text("Start")')
+    if (await startButton.isVisible({ timeout: 2000 }).catch(() => false)) {
+      await startButton.click()
+      await page.waitForTimeout(1000)
+    }
+
+    // Find and click "Return to Arcade" button
+    const returnButton = page.locator('button:has-text("Return to Arcade")')
+    if (await returnButton.isVisible({ timeout: 2000 }).catch(() => false)) {
+      await returnButton.click()
+      await page.waitForTimeout(1000)
+
+      // Should be redirected to arcade lobby
+      await expect(page).toHaveURL(/\/arcade\/?$/)
+
+      // Should see arcade lobby title
+      const title = page.locator('h1:has-text("Champion Arena")')
+      await expect(title).toBeVisible()
+
+      // Now should be able to modify players again
+      const addPlayerButton = page.locator('button:has-text("Add Player"), button:has-text("+")')
+      if (
+        await addPlayerButton
+          .first()
+          .isVisible({ timeout: 2000 })
+          .catch(() => false)
+      ) {
+        await expect(addPlayerButton.first()).toBeEnabled()
+      }
+    }
+  })
+
+  test('should allow navigating to different game after returning to arcade', async ({ page }) => {
+    // Start matching game
+    await page.goto('/arcade/matching')
+    await page.waitForLoadState('networkidle')
+
+    // Return to arcade
+    const returnButton = page.locator(
+      'button:has-text("Return to Arcade"), button:has-text("Setup")'
+    )
+    if (
+      await returnButton
+        .first()
+        .isVisible({ timeout: 2000 })
+        .catch(() => false)
+    ) {
+      await returnButton.first().click()
+      await page.waitForTimeout(1000)
+    }
+
+    // Should be in arcade lobby
+    await expect(page).toHaveURL(/\/arcade\/?$/)
+
+    // Now navigate to different game - should NOT redirect back to matching
+    await page.goto('/arcade/memory-quiz')
+    await page.waitForTimeout(2000)
+
+    // Should stay on memory-quiz (not redirect back to matching)
+    await expect(page).toHaveURL(/\/arcade\/memory-quiz/)
+
+    // Should see memory quiz title
+    const title = page.locator('h1:has-text("Memory Lightning")')
+    await expect(title).toBeVisible({ timeout: 3000 })
+  })
+})
+
+test.describe('Arcade Modal Session - Session Persistence', () => {
+  test('should maintain active session across page reloads', async ({ page }) => {
+    // Start a game
+    await page.goto('/arcade/matching')
+    await page.waitForLoadState('networkidle')
+
+    // Start game
+    const startButton = page.locator('button:has-text("Start")')
+    if (await startButton.isVisible({ timeout: 2000 }).catch(() => false)) {
+      await startButton.click()
+      await page.waitForTimeout(1000)
+    }
+
+    // Reload the page
+    await page.reload()
+    await page.waitForLoadState('networkidle')
+
+    // Should still be on matching game
+    await expect(page).toHaveURL(/\/arcade\/matching/)
+    const gameTitle = page.locator('h1:has-text("Memory Pairs")')
+    await expect(gameTitle).toBeVisible()
+
+    // Try to navigate to arcade
+    await page.goto('/arcade')
+    await page.waitForTimeout(2000)
+
+    // Should be redirected back to matching
+    await expect(page).toHaveURL(/\/arcade\/matching/)
+  })
+})
--- a/apps/web/e2e/mini-nav-persistence.spec.ts
+++ b/apps/web/e2e/mini-nav-persistence.spec.ts
@@ -1,7 +1,9 @@
-import { test, expect } from '@playwright/test'
+import { expect, test } from '@playwright/test'

 test.describe('Mini Navigation Game Name Persistence', () => {
-  test('should not show game name when navigating back to games page from a specific game', async ({ page }) => {
+  test('should not show game name when navigating back to games page from a specific game', async ({
+    page,
+  }) => {
    // Override baseURL for this test to match running dev server
    const baseURL = 'http://localhost:3000'

@@ -73,7 +75,9 @@ test.describe('Mini Navigation Game Name Persistence', () => {
    await expect(page.locator('text=🧠 Memory Lightning')).not.toBeVisible()
  })

-  test('should not persist game name when navigating through intermediate pages', async ({ page }) => {
+  test('should not persist game name when navigating through intermediate pages', async ({
+    page,
+  }) => {
    // Override baseURL for this test to match running dev server
    const baseURL = 'http://localhost:3000'

@@ -108,4 +112,4 @@ test.describe('Mini Navigation Game Name Persistence', () => {
    await expect(memoryLightningName).not.toBeVisible()
    await expect(memoryPairsName).not.toBeVisible()
  })
-})
+})
--- a/apps/web/e2e/nav-slot.spec.ts
+++ b/apps/web/e2e/nav-slot.spec.ts
@@ -1,7 +1,9 @@
-import { test, expect } from '@playwright/test'
+import { expect, test } from '@playwright/test'

 test.describe('Game navigation slots', () => {
-  test('should show Memory Pairs game name in nav when navigating to matching game', async ({ page }) => {
+  test('should show Memory Pairs game name in nav when navigating to matching game', async ({
+    page,
+  }) => {
    await page.goto('/games/matching')

    // Wait for the page to load
@@ -13,7 +15,9 @@ test.describe('Game navigation slots', () => {
    await expect(gameNav).toContainText('Memory Pairs')
  })

-  test('should show Memory Lightning game name in nav when navigating to memory quiz', async ({ page }) => {
+  test('should show Memory Lightning game name in nav when navigating to memory quiz', async ({
+    page,
+  }) => {
    await page.goto('/games/memory-quiz')

    // Wait for the page to load
@@ -70,4 +74,4 @@ test.describe('Game navigation slots', () => {
    const gameNavs = page.locator('h1:has-text("Memory Pairs"), h1:has-text("Memory Lightning")')
    await expect(gameNavs).toHaveCount(0)
  })
-})
+})
--- a/apps/web/e2e/sound-settings-persistence.spec.ts
+++ b/apps/web/e2e/sound-settings-persistence.spec.ts
@@ -1,4 +1,4 @@
-import { test, expect } from '@playwright/test'
+import { expect, test } from '@playwright/test'

 test.describe('Sound Settings Persistence', () => {
  test.beforeEach(async ({ page }) => {
@@ -14,13 +14,13 @@ test.describe('Sound Settings Persistence', () => {
    await page.getByRole('button', { name: /style/i }).click()

    // Find and toggle the sound switch (should be off by default)
-    const soundSwitch = page.locator('[role="switch"]').filter({ hasText: /sound/i }).or(
-      page.locator('input[type="checkbox"]').filter({ hasText: /sound/i })
-    ).or(
-      page.getByLabel(/sound/i)
-    ).or(
-      page.locator('button').filter({ hasText: /sound/i })
-    ).first()
+    const soundSwitch = page
+      .locator('[role="switch"]')
+      .filter({ hasText: /sound/i })
+      .or(page.locator('input[type="checkbox"]').filter({ hasText: /sound/i }))
+      .or(page.getByLabel(/sound/i))
+      .or(page.locator('button').filter({ hasText: /sound/i }))
+      .first()

    await soundSwitch.click()

@@ -37,13 +37,13 @@ test.describe('Sound Settings Persistence', () => {
    await page.reload()
    await page.getByRole('button', { name: /style/i }).click()

-    const soundSwitchAfterReload = page.locator('[role="switch"]').filter({ hasText: /sound/i }).or(
-      page.locator('input[type="checkbox"]').filter({ hasText: /sound/i })
-    ).or(
-      page.getByLabel(/sound/i)
-    ).or(
-      page.locator('button').filter({ hasText: /sound/i })
-    ).first()
+    const soundSwitchAfterReload = page
+      .locator('[role="switch"]')
+      .filter({ hasText: /sound/i })
+      .or(page.locator('input[type="checkbox"]').filter({ hasText: /sound/i }))
+      .or(page.getByLabel(/sound/i))
+      .or(page.locator('button').filter({ hasText: /sound/i }))
+      .first()

    await expect(soundSwitchAfterReload).toBeChecked()
  })
@@ -55,9 +55,10 @@ test.describe('Sound Settings Persistence', () => {
    await page.getByRole('button', { name: /style/i }).click()

    // Find volume slider
-    const volumeSlider = page.locator('input[type="range"]').or(
-      page.locator('[role="slider"]')
-    ).first()
+    const volumeSlider = page
+      .locator('input[type="range"]')
+      .or(page.locator('[role="slider"]'))
+      .first()

    // Set volume to a specific value (e.g., 0.6)
    await volumeSlider.fill('60') // Assuming 0-100 range
@@ -75,9 +76,10 @@ test.describe('Sound Settings Persistence', () => {
    await page.reload()
    await page.getByRole('button', { name: /style/i }).click()

-    const volumeSliderAfterReload = page.locator('input[type="range"]').or(
-      page.locator('[role="slider"]')
-    ).first()
+    const volumeSliderAfterReload = page
+      .locator('input[type="range"]')
+      .or(page.locator('[role="slider"]'))
+      .first()

    const volumeValue = await volumeSliderAfterReload.inputValue()
    expect(parseFloat(volumeValue)).toBeCloseTo(60, 0) // Allow for some variance
@@ -116,4 +118,4 @@ test.describe('Sound Settings Persistence', () => {
    expect(storedConfig.soundEnabled).toBe(true)
    expect(storedConfig.soundVolume).toBe(0.8)
  })
-})
+})
--- a/apps/web/eslint.config.js
+++ b/apps/web/eslint.config.js
@@ -0,0 +1,42 @@
+// Minimal ESLint flat config ONLY for react-hooks rules
+
+import tsParser from '@typescript-eslint/parser'
+import reactHooks from 'eslint-plugin-react-hooks'
+
+const config = [
+  { ignores: ['dist', '.next', 'coverage', 'node_modules', 'styled-system', 'storybook-static'] },
+  {
+    files: ['**/*.tsx', '**/*.ts', '**/*.jsx', '**/*.js'],
+    languageOptions: {
+      parser: tsParser,
+      ecmaVersion: 2022,
+      sourceType: 'module',
+      globals: {
+        React: 'readonly',
+        JSX: 'readonly',
+        console: 'readonly',
+        process: 'readonly',
+        module: 'readonly',
+        require: 'readonly',
+        window: 'readonly',
+        document: 'readonly',
+        localStorage: 'readonly',
+        sessionStorage: 'readonly',
+        fetch: 'readonly',
+        global: 'readonly',
+        Buffer: 'readonly',
+        __dirname: 'readonly',
+        __filename: 'readonly',
+      },
+    },
+    plugins: {
+      'react-hooks': reactHooks,
+    },
+    rules: {
+      'react-hooks/rules-of-hooks': 'error',
+      'react-hooks/exhaustive-deps': 'off',
+    },
+  },
+]
+
+export default config
--- a/apps/web/next.config.js
+++ b/apps/web/next.config.js
@@ -64,4 +64,4 @@ const nextConfig = {
  },
 }

-module.exports = nextConfig
+module.exports = nextConfig
--- a/apps/web/package.json
+++ b/apps/web/package.json
@@ -3,27 +3,33 @@
  "version": "0.1.0",
  "private": true,
  "scripts": {
-    "dev": "concurrently \"next dev\" \"npx @pandacss/dev --watch\"",
-    "build": "next build",
-    "start": "next start",
-    "lint": "next lint",
+    "dev": "concurrently \"node server.js\" \"npx @pandacss/dev --watch\"",
+    "build": "node scripts/generate-build-info.js && next build",
+    "start": "NODE_ENV=production node server.js",
+    "lint": "npx @biomejs/biome lint . && npx eslint .",
+    "lint:fix": "npx @biomejs/biome lint . --write && npx eslint . --fix",
+    "format": "npx @biomejs/biome format . --write",
+    "format:check": "npx @biomejs/biome format .",
+    "check": "npx @biomejs/biome check .",
    "test": "vitest",
    "test:run": "vitest run",
    "type-check": "tsc --noEmit",
    "clean": "rm -rf .next",
    "storybook": "storybook dev -p 6006",
-    "build-storybook": "storybook build"
+    "build-storybook": "storybook build",
+    "db:generate": "drizzle-kit generate",
+    "db:migrate": "tsx src/db/migrate.ts",
+    "db:push": "drizzle-kit push",
+    "db:studio": "drizzle-kit studio",
+    "db:drop": "drizzle-kit drop"
  },
  "dependencies": {
    "@dnd-kit/core": "^6.3.1",
    "@dnd-kit/sortable": "^10.0.0",
    "@dnd-kit/utilities": "^3.2.2",
-    "@myriaddreamin/typst-all-in-one.ts": "0.6.1-rc3",
-    "@myriaddreamin/typst-ts-renderer": "0.6.1-rc3",
-    "@myriaddreamin/typst-ts-web-compiler": "0.6.1-rc3",
-    "@myriaddreamin/typst.ts": "0.6.1-rc3",
    "@number-flow/react": "^0.5.10",
    "@pandacss/dev": "^0.20.0",
+    "@paralleldrive/cuid2": "^2.2.2",
    "@radix-ui/react-accordion": "^1.1.2",
    "@radix-ui/react-checkbox": "^1.0.4",
    "@radix-ui/react-dialog": "^1.0.5",
@@ -45,15 +51,23 @@
    "@soroban/core": "workspace:*",
    "@soroban/templates": "workspace:*",
    "@tanstack/react-form": "^0.19.0",
+    "@tanstack/react-query": "^5.90.2",
    "@types/jsdom": "^21.1.7",
+    "better-sqlite3": "^12.4.1",
+    "drizzle-orm": "^0.44.6",
    "emojibase-data": "^16.0.3",
+    "jose": "^6.1.0",
    "lucide-react": "^0.294.0",
    "make-plural": "^7.4.0",
+    "nanoid": "^5.1.6",
    "next": "^14.2.32",
+    "next-auth": "5.0.0-beta.29",
    "python-bridge": "^1.1.0",
    "react": "^18.2.0",
    "react-dom": "^18.2.0",
-    "react-resizable-layout": "^0.7.3"
+    "react-resizable-layout": "^0.7.3",
+    "socket.io": "^4.8.1",
+    "socket.io-client": "^4.8.1"
  },
  "devDependencies": {
    "@playwright/test": "^1.55.1",
@@ -62,17 +76,20 @@
    "@storybook/nextjs": "^9.1.7",
    "@testing-library/jest-dom": "^6.8.0",
    "@testing-library/react": "^16.3.0",
+    "@types/better-sqlite3": "^7.6.13",
    "@types/node": "^20.0.0",
    "@types/react": "^18.2.0",
    "@types/react-dom": "^18.2.0",
    "@vitejs/plugin-react": "^5.0.2",
    "concurrently": "^8.0.0",
+    "drizzle-kit": "^0.31.5",
    "eslint": "^8.0.0",
    "eslint-config-next": "^14.0.0",
    "eslint-plugin-storybook": "^9.1.7",
    "happy-dom": "^18.0.1",
    "jsdom": "^27.0.0",
    "storybook": "^9.1.7",
+    "tsx": "^4.20.5",
    "typescript": "^5.0.0",
    "vitest": "^1.0.0"
  },
--- a/apps/web/panda.config.ts
+++ b/apps/web/panda.config.ts
@@ -36,17 +36,23 @@ export default defineConfig({
            wood: { value: '#8B4513' },
            bead: { value: '#2C1810' },
            inactive: { value: '#D3D3D3' },
-            bar: { value: '#654321' }
-          }
+            bar: { value: '#654321' },
+          },
        },
        fonts: {
-          body: { value: 'Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif' },
-          heading: { value: 'Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif' },
-          mono: { value: 'Monaco, "Cascadia Code", "Roboto Mono", Consolas, "Courier New", monospace' }
+          body: {
+            value: 'Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif',
+          },
+          heading: {
+            value: 'Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif',
+          },
+          mono: {
+            value: 'Monaco, "Cascadia Code", "Roboto Mono", Consolas, "Courier New", monospace',
+          },
        },
        shadows: {
          card: { value: '0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06)' },
-          modal: { value: '0 25px 50px -12px rgba(0, 0, 0, 0.25)' }
+          modal: { value: '0 25px 50px -12px rgba(0, 0, 0, 0.25)' },
        },
        animations: {
          // Shake animation for errors (web_generator.py line 3419)
@@ -60,49 +66,51 @@ export default defineConfig({
          bounce: { value: 'bounce 1s infinite alternate' },
          bounceIn: { value: 'bounceIn 1s ease-out' },
          // Glow animation (line 6260)
-          glow: { value: 'glow 1s ease-in-out infinite alternate' }
-        }
+          glow: { value: 'glow 1s ease-in-out infinite alternate' },
+        },
      },
      keyframes: {
        // Shake - horizontal oscillation for errors (line 3419)
        shake: {
          '0%, 100%': { transform: 'translateX(0)' },
          '25%': { transform: 'translateX(-5px)' },
-          '75%': { transform: 'translateX(5px)' }
+          '75%': { transform: 'translateX(5px)' },
        },
        // Success pulse - gentle scale for correct answers (line 2004)
        successPulse: {
          '0%, 100%': { transform: 'scale(1)' },
-          '50%': { transform: 'scale(1.05)' }
+          '50%': { transform: 'scale(1.05)' },
        },
        // Pulse - continuous breathing effect (line 6255)
        pulse: {
          '0%, 100%': { transform: 'scale(1)' },
-          '50%': { transform: 'scale(1.05)' }
+          '50%': { transform: 'scale(1.05)' },
        },
        // Error shake - stronger horizontal oscillation (line 2009)
        errorShake: {
          '0%, 100%': { transform: 'translateX(0)' },
          '25%': { transform: 'translateX(-10px)' },
-          '75%': { transform: 'translateX(10px)' }
+          '75%': { transform: 'translateX(10px)' },
        },
        // Bounce - vertical oscillation (line 6271)
        bounce: {
          '0%, 100%': { transform: 'translateY(0)' },
-          '50%': { transform: 'translateY(-10px)' }
+          '50%': { transform: 'translateY(-10px)' },
        },
        // Bounce in - entry animation with scale and rotate (line 6265)
        bounceIn: {
          '0%': { transform: 'scale(0.3) rotate(-10deg)', opacity: '0' },
          '50%': { transform: 'scale(1.1) rotate(5deg)' },
-          '100%': { transform: 'scale(1) rotate(0deg)', opacity: '1' }
+          '100%': { transform: 'scale(1) rotate(0deg)', opacity: '1' },
        },
        // Glow - expanding box shadow (line 6260)
        glow: {
          '0%': { boxShadow: '0 0 5px rgba(255, 255, 255, 0.5)' },
-          '100%': { boxShadow: '0 0 20px rgba(255, 255, 255, 0.8), 0 0 30px rgba(255, 255, 255, 0.6)' }
-        }
-      }
-    }
-  }
-})
+          '100%': {
+            boxShadow: '0 0 20px rgba(255, 255, 255, 0.8), 0 0 30px rgba(255, 255, 255, 0.6)',
+          },
+        },
+      },
+    },
+  },
+})
--- a/apps/web/playwright.config.ts
+++ b/apps/web/playwright.config.ts
@@ -24,4 +24,4 @@ export default defineConfig({
    url: 'http://localhost:3002',
    reuseExistingServer: !process.env.CI,
  },
-})
+})
--- a/apps/web/scripts/generate-build-info.js
+++ b/apps/web/scripts/generate-build-info.js
@@ -0,0 +1,58 @@
+#!/usr/bin/env node
+
+/**
+ * Generate build information for deployment tracking
+ * This script captures git commit, branch, timestamp, and other metadata
+ */
+
+const { execSync } = require('child_process')
+const fs = require('fs')
+const path = require('path')
+
+function exec(command) {
+  try {
+    return execSync(command, { encoding: 'utf-8' }).trim()
+  } catch (_error) {
+    return null
+  }
+}
+
+function getBuildInfo() {
+  const gitCommit = exec('git rev-parse HEAD')
+  const gitCommitShort = exec('git rev-parse --short HEAD')
+  const gitBranch = exec('git rev-parse --abbrev-ref HEAD')
+  const gitTag = exec('git describe --tags --exact-match 2>/dev/null')
+  const gitDirty = exec('git diff --quiet || echo "dirty"') === 'dirty'
+
+  const packageJson = require('../package.json')
+
+  return {
+    version: packageJson.version,
+    buildTime: new Date().toISOString(),
+    buildTimestamp: Date.now(),
+    git: {
+      commit: gitCommit,
+      commitShort: gitCommitShort,
+      branch: gitBranch,
+      tag: gitTag,
+      isDirty: gitDirty,
+    },
+    environment: process.env.NODE_ENV || 'development',
+    buildNumber: process.env.BUILD_NUMBER || null,
+    nodeVersion: process.version,
+  }
+}
+
+const buildInfo = getBuildInfo()
+const outputPath = path.join(__dirname, '..', 'src', 'generated', 'build-info.json')
+
+// Ensure directory exists
+const dir = path.dirname(outputPath)
+if (!fs.existsSync(dir)) {
+  fs.mkdirSync(dir, { recursive: true })
+}
+
+fs.writeFileSync(outputPath, JSON.stringify(buildInfo, null, 2))
+
+console.log('✅ Build info generated:', outputPath)
+console.log(JSON.stringify(buildInfo, null, 2))
--- a/apps/web/server.js
+++ b/apps/web/server.js
@@ -0,0 +1,51 @@
+const { createServer } = require('http')
+const { parse } = require('url')
+const next = require('next')
+
+const dev = process.env.NODE_ENV !== 'production'
+const hostname = 'localhost'
+const port = parseInt(process.env.PORT || '3000', 10)
+
+const app = next({ dev, hostname, port })
+const handle = app.getRequestHandler()
+
+// Run migrations before starting server
+console.log('🔄 Running database migrations...')
+require('tsx/cjs')
+const { migrate } = require('drizzle-orm/better-sqlite3/migrator')
+const { db } = require('./src/db/index.ts')
+
+try {
+  migrate(db, { migrationsFolder: './drizzle' })
+  console.log('✅ Migrations complete')
+} catch (error) {
+  console.error('❌ Migration failed:', error)
+  process.exit(1)
+}
+
+app.prepare().then(() => {
+  const server = createServer(async (req, res) => {
+    try {
+      const parsedUrl = parse(req.url, true)
+      await handle(req, res, parsedUrl)
+    } catch (err) {
+      console.error('Error occurred handling', req.url, err)
+      res.statusCode = 500
+      res.end('internal server error')
+    }
+  })
+
+  // Initialize Socket.IO (load TypeScript with tsx)
+  require('tsx/cjs')
+  const { initializeSocketServer } = require('./socket-server.ts')
+  initializeSocketServer(server)
+
+  server
+    .once('error', (err) => {
+      console.error(err)
+      process.exit(1)
+    })
+    .listen(port, () => {
+      console.log(`> Ready on http://${hostname}:${port}`)
+    })
+})
--- a/apps/web/socket-server.js
+++ b/apps/web/socket-server.js
@@ -0,0 +1,29 @@
+const { Server } = require('socket.io')
+
+function initializeSocketServer(httpServer) {
+  const io = new Server(httpServer, {
+    path: '/api/socket',
+    cors: {
+      origin: process.env.NEXT_PUBLIC_URL || 'http://localhost:3000',
+      credentials: true,
+    },
+  })
+
+  io.on('connection', (socket) => {
+    console.log('🔌 Client connected:', socket.id)
+
+    socket.on('join-arcade-session', ({ userId }) => {
+      socket.join(`arcade:${userId}`)
+      console.log(`👤 User ${userId} joined arcade room`)
+    })
+
+    socket.on('disconnect', () => {
+      console.log('🔌 Client disconnected:', socket.id)
+    })
+  })
+
+  console.log('✅ Socket.IO initialized on /api/socket')
+  return io
+}
+
+module.exports = { initializeSocketServer }
--- a/apps/web/socket-server.ts
+++ b/apps/web/socket-server.ts
@@ -0,0 +1,176 @@
+import type { Server as HTTPServer } from 'http'
+import { Server as SocketIOServer } from 'socket.io'
+import {
+  applyGameMove,
+  createArcadeSession,
+  deleteArcadeSession,
+  getArcadeSession,
+  updateSessionActivity,
+} from './src/lib/arcade/session-manager'
+import type { GameMove } from './src/lib/arcade/validation'
+import { matchingGameValidator } from './src/lib/arcade/validation/MatchingGameValidator'
+
+export function initializeSocketServer(httpServer: HTTPServer) {
+  const io = new SocketIOServer(httpServer, {
+    path: '/api/socket',
+    cors: {
+      origin: process.env.NEXT_PUBLIC_URL || 'http://localhost:3000',
+      credentials: true,
+    },
+  })
+
+  io.on('connection', (socket) => {
+    console.log('🔌 Client connected:', socket.id)
+    let currentUserId: string | null = null
+
+    // Join arcade session room
+    socket.on('join-arcade-session', async ({ userId }: { userId: string }) => {
+      currentUserId = userId
+      socket.join(`arcade:${userId}`)
+      console.log(`👤 User ${userId} joined arcade room`)
+
+      // Send current session state if exists
+      try {
+        const session = await getArcadeSession(userId)
+        if (session) {
+          socket.emit('session-state', {
+            gameState: session.gameState,
+            currentGame: session.currentGame,
+            gameUrl: session.gameUrl,
+            activePlayers: session.activePlayers,
+            version: session.version,
+          })
+        } else {
+          socket.emit('no-active-session')
+        }
+      } catch (error) {
+        console.error('Error fetching session:', error)
+        socket.emit('session-error', { error: 'Failed to fetch session' })
+      }
+    })
+
+    // Handle game moves
+    socket.on('game-move', async (data: { userId: string; move: GameMove }) => {
+      console.log('🎮 Game move received:', {
+        userId: data.userId,
+        moveType: data.move.type,
+        playerId: data.move.playerId,
+        timestamp: data.move.timestamp,
+        fullMove: JSON.stringify(data.move, null, 2),
+      })
+
+      try {
+        // Special handling for START_GAME - create session if it doesn't exist
+        if (data.move.type === 'START_GAME') {
+          const existingSession = await getArcadeSession(data.userId)
+
+          if (!existingSession) {
+            console.log('🎯 Creating new session for START_GAME')
+
+            // activePlayers must be provided in the START_GAME move data
+            const activePlayers = (data.move.data as any)?.activePlayers
+            if (!activePlayers || activePlayers.length === 0) {
+              console.error('❌ START_GAME move missing activePlayers')
+              socket.emit('move-rejected', {
+                error: 'START_GAME requires at least one active player',
+                move: data.move,
+              })
+              return
+            }
+
+            // Get initial state from validator
+            const initialState = matchingGameValidator.getInitialState({
+              difficulty: 6,
+              gameType: 'abacus-numeral',
+              turnTimer: 30,
+            })
+
+            await createArcadeSession({
+              userId: data.userId,
+              gameName: 'matching',
+              gameUrl: '/arcade/matching',
+              initialState,
+              activePlayers,
+            })
+
+            console.log('✅ Session created successfully')
+
+            // Notify all connected clients about the new session
+            const newSession = await getArcadeSession(data.userId)
+            if (newSession) {
+              io.to(`arcade:${data.userId}`).emit('session-state', {
+                gameState: newSession.gameState,
+                currentGame: newSession.currentGame,
+                gameUrl: newSession.gameUrl,
+                activePlayers: newSession.activePlayers,
+                version: newSession.version,
+              })
+              console.log('📢 Emitted session-state to notify clients of new session')
+            }
+          }
+        }
+
+        const result = await applyGameMove(data.userId, data.move)
+
+        if (result.success && result.session) {
+          // Broadcast the updated state to all devices for this user
+          io.to(`arcade:${data.userId}`).emit('move-accepted', {
+            gameState: result.session.gameState,
+            version: result.session.version,
+            move: data.move,
+          })
+
+          // Update activity timestamp
+          await updateSessionActivity(data.userId)
+        } else {
+          // Send rejection only to the requesting socket
+          socket.emit('move-rejected', {
+            error: result.error,
+            move: data.move,
+            versionConflict: result.versionConflict,
+          })
+        }
+      } catch (error) {
+        console.error('Error processing move:', error)
+        socket.emit('move-rejected', {
+          error: 'Server error processing move',
+          move: data.move,
+        })
+      }
+    })
+
+    // Handle session exit
+    socket.on('exit-arcade-session', async ({ userId }: { userId: string }) => {
+      console.log('🚪 User exiting arcade session:', userId)
+
+      try {
+        await deleteArcadeSession(userId)
+        io.to(`arcade:${userId}`).emit('session-ended')
+      } catch (error) {
+        console.error('Error ending session:', error)
+        socket.emit('session-error', { error: 'Failed to end session' })
+      }
+    })
+
+    // Keep-alive ping
+    socket.on('ping-session', async ({ userId }: { userId: string }) => {
+      try {
+        await updateSessionActivity(userId)
+        socket.emit('pong-session')
+      } catch (error) {
+        console.error('Error updating activity:', error)
+      }
+    })
+
+    socket.on('disconnect', () => {
+      console.log('🔌 Client disconnected:', socket.id)
+      if (currentUserId) {
+        // Don't delete session on disconnect - it persists across devices
+        console.log(`👤 User ${currentUserId} disconnected but session persists`)
+      }
+    })
+  })
+
+  console.log('✅ Socket.IO initialized on /api/socket')
+  return io
+}
--- a/apps/web/src/app/tests/layout.nav.test.tsx
+++ b/apps/web/src/app/tests/layout.nav.test.tsx
@@ -34,11 +34,7 @@ describe('RootLayout with nav slot', () => {
    const navContent = <div>Memory Lightning</div>
    const pageContent = <div>Page content</div>

-    render(
-      <RootLayout nav={navContent}>
-        {pageContent}
-      </RootLayout>
-    )
+    render(<RootLayout nav={navContent}>{pageContent}</RootLayout>)

    expect(screen.getByTestId('app-nav-bar')).toBeInTheDocument()
    expect(screen.getByTestId('nav-slot-content')).toBeInTheDocument()
@@ -49,14 +45,10 @@ describe('RootLayout with nav slot', () => {
  it('works without nav slot', () => {
    const pageContent = <div>Page content</div>

-    render(
-      <RootLayout nav={null}>
-        {pageContent}
-      </RootLayout>
-    )
+    render(<RootLayout nav={null}>{pageContent}</RootLayout>)

    expect(screen.getByTestId('app-nav-bar')).toBeInTheDocument()
    expect(screen.queryByTestId('nav-slot-content')).not.toBeInTheDocument()
    expect(screen.getByText('Page content')).toBeInTheDocument()
  })
-})
+})
--- a/apps/web/src/app/abacus-test/page.tsx
+++ b/apps/web/src/app/abacus-test/page.tsx
@@ -1,8 +1,8 @@
 'use client'

 import { AbacusReact } from '@soroban/abacus-react'
-import { css } from '../../../styled-system/css'
 import { useState } from 'react'
+import { css } from '../../../styled-system/css'

 export default function AbacusTestPage() {
  const [value, setValue] = useState(0)
@@ -15,32 +15,36 @@ export default function AbacusTestPage() {
  }

  return (
-    <div className={css({
-      position: 'fixed',
-      top: 0,
-      left: 0,
-      right: 0,
-      bottom: 0,
-      bg: 'gray.50',
-      display: 'flex',
-      flexDirection: 'column',
-      alignItems: 'center',
-      justifyContent: 'center',
-      padding: '4'
-    })}>
+    <div
+      className={css({
+        position: 'fixed',
+        top: 0,
+        left: 0,
+        right: 0,
+        bottom: 0,
+        bg: 'gray.50',
+        display: 'flex',
+        flexDirection: 'column',
+        alignItems: 'center',
+        justifyContent: 'center',
+        padding: '4',
+      })}
+    >
      {/* Debug info */}
-      <div className={css({
-        position: 'absolute',
-        top: '4',
-        left: '4',
-        bg: 'white',
-        p: '3',
-        rounded: 'md',
-        border: '1px solid',
-        borderColor: 'gray.300',
-        fontSize: 'sm',
-        fontFamily: 'mono'
-      })}>
+      <div
+        className={css({
+          position: 'absolute',
+          top: '4',
+          left: '4',
+          bg: 'white',
+          p: '3',
+          rounded: 'md',
+          border: '1px solid',
+          borderColor: 'gray.300',
+          fontSize: 'sm',
+          fontFamily: 'mono',
+        })}
+      >
        <div>Current Value: {value}</div>
        <div>{debugInfo}</div>
        <button
@@ -53,7 +57,7 @@ export default function AbacusTestPage() {
            color: 'white',
            rounded: 'sm',
            fontSize: 'xs',
-            cursor: 'pointer'
+            cursor: 'pointer',
          })}
        >
          Reset to 0
@@ -68,20 +72,22 @@ export default function AbacusTestPage() {
            color: 'white',
            rounded: 'sm',
            fontSize: 'xs',
-            cursor: 'pointer'
+            cursor: 'pointer',
          })}
        >
          Set to 12345
        </button>
      </div>

-      <div style={{
-        width: '100%',
-        height: '100%',
-        display: 'flex',
-        alignItems: 'center',
-        justifyContent: 'center'
-      }}>
+      <div
+        style={{
+          width: '100%',
+          height: '100%',
+          display: 'flex',
+          alignItems: 'center',
+          justifyContent: 'center',
+        }}
+      >
        <AbacusReact
          value={value}
          columns={5}
@@ -97,4 +103,4 @@ export default function AbacusTestPage() {
      </div>
    </div>
  )
-}
+}
--- a/apps/web/src/app/api/abacus-settings/route.ts
+++ b/apps/web/src/app/api/abacus-settings/route.ts
@@ -0,0 +1,101 @@
+import { eq } from 'drizzle-orm'
+import { type NextRequest, NextResponse } from 'next/server'
+import { db } from '@/db'
+import * as schema from '@/db/schema'
+import { getViewerId } from '@/lib/viewer'
+
+/**
+ * GET /api/abacus-settings
+ * Fetch abacus display settings for the current user
+ */
+export async function GET() {
+  try {
+    const viewerId = await getViewerId()
+    const user = await getOrCreateUser(viewerId)
+
+    // Find or create abacus settings
+    let settings = await db.query.abacusSettings.findFirst({
+      where: eq(schema.abacusSettings.userId, user.id),
+    })
+
+    // If no settings exist, create with defaults
+    if (!settings) {
+      const [newSettings] = await db
+        .insert(schema.abacusSettings)
+        .values({ userId: user.id })
+        .returning()
+      settings = newSettings
+    }
+
+    return NextResponse.json({ settings })
+  } catch (error) {
+    console.error('Failed to fetch abacus settings:', error)
+    return NextResponse.json({ error: 'Failed to fetch abacus settings' }, { status: 500 })
+  }
+}
+
+/**
+ * PATCH /api/abacus-settings
+ * Update abacus display settings for the current user
+ */
+export async function PATCH(req: NextRequest) {
+  try {
+    const viewerId = await getViewerId()
+    const body = await req.json()
+
+    // Security: Strip userId from request body - it must come from session only
+    const { userId: _, ...updates } = body
+
+    const user = await getOrCreateUser(viewerId)
+
+    // Ensure settings exist
+    const existingSettings = await db.query.abacusSettings.findFirst({
+      where: eq(schema.abacusSettings.userId, user.id),
+    })
+
+    if (!existingSettings) {
+      // Create new settings with updates
+      const [newSettings] = await db
+        .insert(schema.abacusSettings)
+        .values({ userId: user.id, ...updates })
+        .returning()
+      return NextResponse.json({ settings: newSettings })
+    }
+
+    // Update existing settings
+    const [updatedSettings] = await db
+      .update(schema.abacusSettings)
+      .set(updates)
+      .where(eq(schema.abacusSettings.userId, user.id))
+      .returning()
+
+    return NextResponse.json({ settings: updatedSettings })
+  } catch (error) {
+    console.error('Failed to update abacus settings:', error)
+    return NextResponse.json({ error: 'Failed to update abacus settings' }, { status: 500 })
+  }
+}
+
+/**
+ * Get or create a user record for the given viewer ID (guest or user)
+ */
+async function getOrCreateUser(viewerId: string) {
+  // Try to find existing user by guest ID
+  let user = await db.query.users.findFirst({
+    where: eq(schema.users.guestId, viewerId),
+  })
+
+  // If no user exists, create one
+  if (!user) {
+    const [newUser] = await db
+      .insert(schema.users)
+      .values({
+        guestId: viewerId,
+      })
+      .returning()
+
+    user = newUser
+  }
+
+  return user
+}
--- a/apps/web/src/app/api/arcade-session/tests/route.test.ts
+++ b/apps/web/src/app/api/arcade-session/tests/route.test.ts
@@ -0,0 +1,176 @@
+import { eq } from 'drizzle-orm'
+import { NextRequest } from 'next/server'
+import { afterEach, beforeEach, describe, expect, it } from 'vitest'
+import { db, schema } from '@/db'
+import { deleteArcadeSession } from '@/lib/arcade/session-manager'
+import { DELETE, GET, POST } from '../route'
+
+describe('Arcade Session API Routes', () => {
+  const testUserId = 'test-user-for-api-routes'
+  const testGuestId = 'test-guest-id-api-routes'
+  const baseUrl = 'http://localhost:3000'
+
+  beforeEach(async () => {
+    // Create test user
+    await db
+      .insert(schema.users)
+      .values({
+        id: testUserId,
+        guestId: testGuestId,
+        createdAt: new Date(),
+      })
+      .onConflictDoNothing()
+  })
+
+  afterEach(async () => {
+    // Clean up
+    await deleteArcadeSession(testUserId)
+    await db.delete(schema.users).where(eq(schema.users.id, testUserId))
+  })
+
+  describe('POST /api/arcade-session', () => {
+    it('should create a new session', async () => {
+      const request = new NextRequest(`${baseUrl}/api/arcade-session`, {
+        method: 'POST',
+        body: JSON.stringify({
+          userId: testUserId,
+          gameName: 'matching',
+          gameUrl: '/arcade/matching',
+          initialState: { test: 'state' },
+          activePlayers: [1],
+        }),
+      })
+
+      const response = await POST(request)
+      const data = await response.json()
+
+      expect(response.status).toBe(200)
+      expect(data.session).toBeDefined()
+      expect(data.session.currentGame).toBe('matching')
+      expect(data.session.version).toBe(1)
+    })
+
+    it('should return 400 for missing fields', async () => {
+      const request = new NextRequest(`${baseUrl}/api/arcade-session`, {
+        method: 'POST',
+        body: JSON.stringify({
+          userId: testUserId,
+          // Missing required fields
+        }),
+      })
+
+      const response = await POST(request)
+      const data = await response.json()
+
+      expect(response.status).toBe(400)
+      expect(data.error).toBe('Missing required fields')
+    })
+
+    it('should return 500 for non-existent user (foreign key constraint)', async () => {
+      const request = new NextRequest(`${baseUrl}/api/arcade-session`, {
+        method: 'POST',
+        body: JSON.stringify({
+          userId: 'non-existent-user',
+          gameName: 'matching',
+          gameUrl: '/arcade/matching',
+          initialState: {},
+          activePlayers: [1],
+        }),
+      })
+
+      const response = await POST(request)
+
+      expect(response.status).toBe(500)
+    })
+  })
+
+  describe('GET /api/arcade-session', () => {
+    it('should retrieve an existing session', async () => {
+      // Create session first
+      const createRequest = new NextRequest(`${baseUrl}/api/arcade-session`, {
+        method: 'POST',
+        body: JSON.stringify({
+          userId: testUserId,
+          gameName: 'matching',
+          gameUrl: '/arcade/matching',
+          initialState: { test: 'state' },
+          activePlayers: [1],
+        }),
+      })
+      await POST(createRequest)
+
+      // Now retrieve it
+      const request = new NextRequest(`${baseUrl}/api/arcade-session?userId=${testUserId}`)
+
+      const response = await GET(request)
+      const data = await response.json()
+
+      expect(response.status).toBe(200)
+      expect(data.session).toBeDefined()
+      expect(data.session.currentGame).toBe('matching')
+    })
+
+    it('should return 404 for non-existent session', async () => {
+      const request = new NextRequest(`${baseUrl}/api/arcade-session?userId=non-existent`)
+
+      const response = await GET(request)
+
+      expect(response.status).toBe(404)
+    })
+
+    it('should return 400 for missing userId', async () => {
+      const request = new NextRequest(`${baseUrl}/api/arcade-session`)
+
+      const response = await GET(request)
+      const data = await response.json()
+
+      expect(response.status).toBe(400)
+      expect(data.error).toBe('userId required')
+    })
+  })
+
+  describe('DELETE /api/arcade-session', () => {
+    it('should delete an existing session', async () => {
+      // Create session first
+      const createRequest = new NextRequest(`${baseUrl}/api/arcade-session`, {
+        method: 'POST',
+        body: JSON.stringify({
+          userId: testUserId,
+          gameName: 'matching',
+          gameUrl: '/arcade/matching',
+          initialState: {},
+          activePlayers: [1],
+        }),
+      })
+      await POST(createRequest)
+
+      // Now delete it
+      const request = new NextRequest(`${baseUrl}/api/arcade-session?userId=${testUserId}`, {
+        method: 'DELETE',
+      })
+
+      const response = await DELETE(request)
+      const data = await response.json()
+
+      expect(response.status).toBe(200)
+      expect(data.success).toBe(true)
+
+      // Verify it's deleted
+      const getRequest = new NextRequest(`${baseUrl}/api/arcade-session?userId=${testUserId}`)
+      const getResponse = await GET(getRequest)
+      expect(getResponse.status).toBe(404)
+    })
+
+    it('should return 400 for missing userId', async () => {
+      const request = new NextRequest(`${baseUrl}/api/arcade-session`, {
+        method: 'DELETE',
+      })
+
+      const response = await DELETE(request)
+      const data = await response.json()
+
+      expect(response.status).toBe(400)
+      expect(data.error).toBe('userId required')
+    })
+  })
+})
--- a/apps/web/src/app/api/arcade-session/route.ts
+++ b/apps/web/src/app/api/arcade-session/route.ts
@@ -0,0 +1,99 @@
+import { type NextRequest, NextResponse } from 'next/server'
+import {
+  createArcadeSession,
+  deleteArcadeSession,
+  getArcadeSession,
+} from '@/lib/arcade/session-manager'
+import type { GameName } from '@/lib/arcade/validation'
+
+/**
+ * GET /api/arcade-session?userId=xxx
+ * Get the active arcade session for a user
+ */
+export async function GET(request: NextRequest) {
+  try {
+    const userId = request.nextUrl.searchParams.get('userId')
+
+    if (!userId) {
+      return NextResponse.json({ error: 'userId required' }, { status: 400 })
+    }
+
+    const session = await getArcadeSession(userId)
+
+    if (!session) {
+      return NextResponse.json({ error: 'No active session' }, { status: 404 })
+    }
+
+    return NextResponse.json({
+      session: {
+        currentGame: session.currentGame,
+        gameUrl: session.gameUrl,
+        gameState: session.gameState,
+        activePlayers: session.activePlayers,
+        version: session.version,
+        expiresAt: session.expiresAt,
+      },
+    })
+  } catch (error) {
+    console.error('Error fetching arcade session:', error)
+    return NextResponse.json({ error: 'Internal server error' }, { status: 500 })
+  }
+}
+
+/**
+ * POST /api/arcade-session
+ * Create a new arcade session
+ */
+export async function POST(request: NextRequest) {
+  try {
+    const body = await request.json()
+    const { userId, gameName, gameUrl, initialState, activePlayers } = body
+
+    if (!userId || !gameName || !gameUrl || !initialState || !activePlayers) {
+      return NextResponse.json({ error: 'Missing required fields' }, { status: 400 })
+    }
+
+    const session = await createArcadeSession({
+      userId,
+      gameName: gameName as GameName,
+      gameUrl,
+      initialState,
+      activePlayers,
+    })
+
+    return NextResponse.json({
+      session: {
+        currentGame: session.currentGame,
+        gameUrl: session.gameUrl,
+        gameState: session.gameState,
+        activePlayers: session.activePlayers,
+        version: session.version,
+        expiresAt: session.expiresAt,
+      },
+    })
+  } catch (error) {
+    console.error('Error creating arcade session:', error)
+    return NextResponse.json({ error: 'Internal server error' }, { status: 500 })
+  }
+}
+
+/**
+ * DELETE /api/arcade-session?userId=xxx
+ * Delete an arcade session
+ */
+export async function DELETE(request: NextRequest) {
+  try {
+    const userId = request.nextUrl.searchParams.get('userId')
+
+    if (!userId) {
+      return NextResponse.json({ error: 'userId required' }, { status: 400 })
+    }
+
+    await deleteArcadeSession(userId)
+
+    return NextResponse.json({ success: true })
+  } catch (error) {
+    console.error('Error deleting arcade session:', error)
+    return NextResponse.json({ error: 'Internal server error' }, { status: 500 })
+  }
+}
--- a/apps/web/src/app/api/arcade-session/types.ts
+++ b/apps/web/src/app/api/arcade-session/types.ts
@@ -0,0 +1,18 @@
+/**
+ * API response types for /api/arcade-session
+ */
+
+export interface ArcadeSessionResponse {
+  session: {
+    currentGame: string
+    gameUrl: string
+    gameState: unknown
+    activePlayers: number[]
+    version: number
+    expiresAt: Date | string
+  }
+}
+
+export interface ArcadeSessionErrorResponse {
+  error: string
+}
--- a/apps/web/src/app/api/auth/[...nextauth]/route.ts
+++ b/apps/web/src/app/api/auth/[...nextauth]/route.ts
@@ -0,0 +1,17 @@
+/**
+ * NextAuth v5 API route handlers
+ *
+ * Handles all NextAuth routes:
+ * - GET  /api/auth/signin
+ * - POST /api/auth/signin/:provider
+ * - GET  /api/auth/signout
+ * - POST /api/auth/signout
+ * - GET  /api/auth/session
+ * - GET  /api/auth/csrf
+ * - POST /api/auth/callback/:provider
+ * - etc.
+ */
+
+import { handlers } from '@/auth'
+
+export const { GET, POST } = handlers
--- a/apps/web/src/app/api/build-info/route.ts
+++ b/apps/web/src/app/api/build-info/route.ts
@@ -0,0 +1,6 @@
+import { NextResponse } from 'next/server'
+import buildInfo from '@/generated/build-info.json'
+
+export async function GET() {
+  return NextResponse.json(buildInfo)
+}
--- a/apps/web/src/app/api/download/[id]/route.ts
+++ b/apps/web/src/app/api/download/[id]/route.ts
@@ -1,10 +1,7 @@
-import { NextRequest, NextResponse } from 'next/server'
+import { type NextRequest, NextResponse } from 'next/server'
 import { assetStore } from '@/lib/asset-store'

-export async function GET(
-  request: NextRequest,
-  { params }: { params: { id: string } }
-) {
+export async function GET(_request: NextRequest, { params }: { params: { id: string } }) {
  try {
    const { id } = params

@@ -15,9 +12,12 @@ export async function GET(
    const asset = await assetStore.get(id)
    if (!asset) {
      console.log('❌ Asset not found in store')
-      return NextResponse.json({
-        error: 'Asset not found or expired'
-      }, { status: 404 })
+      return NextResponse.json(
+        {
+          error: 'Asset not found or expired',
+        },
+        { status: 404 }
+      )
    }

    console.log('✅ Asset found, serving download')
@@ -30,15 +30,17 @@ export async function GET(
        'Content-Disposition': `attachment; filename="${asset.filename}"`,
        'Content-Length': asset.data.length.toString(),
        'Cache-Control': 'private, no-cache, no-store, must-revalidate',
-        'Expires': '0',
-        'Pragma': 'no-cache'
-      }
+        Expires: '0',
+        Pragma: 'no-cache',
+      },
    })
-
  } catch (error) {
    console.error('❌ Download failed:', error)
-    return NextResponse.json({
-      error: 'Failed to download file'
-    }, { status: 500 })
+    return NextResponse.json(
+      {
+        error: 'Failed to download file',
+      },
+      { status: 500 }
+    )
  }
-}
+}
--- a/apps/web/src/app/api/download/assets/[id]/route.ts
+++ b/apps/web/src/app/api/download/assets/[id]/route.ts
@@ -1,19 +1,13 @@
-import { NextRequest, NextResponse } from 'next/server'
+import { type NextRequest, NextResponse } from 'next/server'
 import { assetStore } from '@/lib/asset-store'

-export async function GET(
-  request: NextRequest,
-  { params }: { params: { id: string } }
-) {
+export async function GET(_request: NextRequest, { params }: { params: { id: string } }) {
  try {
    const { id } = params

    const asset = await assetStore.get(id)
    if (!asset) {
-      return NextResponse.json(
-        { error: 'Asset not found' },
-        { status: 404 }
-      )
+      return NextResponse.json({ error: 'Asset not found' }, { status: 404 })
    }

    // Set appropriate headers for download
@@ -25,14 +19,10 @@ export async function GET(

    return new NextResponse(asset.data, {
      status: 200,
-      headers
+      headers,
    })
-
  } catch (error) {
    console.error('Asset download error:', error)
-    return NextResponse.json(
-      { error: 'Failed to download asset' },
-      { status: 500 }
-    )
+    return NextResponse.json({ error: 'Failed to download asset' }, { status: 500 })
  }
-}
+}
--- a/apps/web/src/app/api/generate/route.ts
+++ b/apps/web/src/app/api/generate/route.ts
@@ -1,5 +1,5 @@
-import { NextRequest, NextResponse } from 'next/server'
 import { SorobanGenerator } from '@soroban/core'
+import { type NextRequest, NextResponse } from 'next/server'
 import path from 'path'

 // Global generator instance for better performance
@@ -36,14 +36,17 @@ export async function POST(request: NextRequest) {
    // Check dependencies before generating
    const deps = await gen.checkDependencies?.()
    if (deps && (!deps.python || !deps.typst)) {
-      return NextResponse.json({
-        error: 'Missing system dependencies',
-        details: {
-          python: deps.python ? '✅ Available' : '❌ Missing Python 3',
-          typst: deps.typst ? '✅ Available' : '❌ Missing Typst',
-          qpdf: deps.qpdf ? '✅ Available' : '⚠️ Missing qpdf (optional)'
-        }
-      }, { status: 500 })
+      return NextResponse.json(
+        {
+          error: 'Missing system dependencies',
+          details: {
+            python: deps.python ? '✅ Available' : '❌ Missing Python 3',
+            typst: deps.typst ? '✅ Available' : '❌ Missing Typst',
+            qpdf: deps.qpdf ? '✅ Available' : '⚠️ Missing qpdf (optional)',
+          },
+        },
+        { status: 500 }
+      )
    }

    // Generate flashcards using Python via TypeScript bindings
@@ -52,7 +55,7 @@ export async function POST(request: NextRequest) {

    // SorobanGenerator.generate() returns PDF data directly as Buffer
    if (!Buffer.isBuffer(result)) {
-      throw new Error('Expected PDF Buffer from generator, got: ' + typeof result)
+      throw new Error(`Expected PDF Buffer from generator, got: ${typeof result}`)
    }
    const pdfBuffer = result
    // Create filename for download
@@ -63,25 +66,27 @@ export async function POST(request: NextRequest) {
      headers: {
        'Content-Type': 'application/pdf',
        'Content-Disposition': `attachment; filename="${filename}"`,
-        'Content-Length': pdfBuffer.length.toString()
-      }
+        'Content-Length': pdfBuffer.length.toString(),
+      },
    })
-
  } catch (error) {
    console.error('❌ Generation failed:', error)

-    return NextResponse.json({
-      error: 'Failed to generate flashcards',
-      details: error instanceof Error ? error.message : 'Unknown error',
-      success: false
-    }, { status: 500 })
+    return NextResponse.json(
+      {
+        error: 'Failed to generate flashcards',
+        details: error instanceof Error ? error.message : 'Unknown error',
+        success: false,
+      },
+      { status: 500 }
+    )
  }
 }

 // Helper functions to calculate metadata
-function calculateCardCount(range: string, step: number): number {
+function _calculateCardCount(range: string, step: number): number {
  if (range.includes('-')) {
-    const [start, end] = range.split('-').map(n => parseInt(n) || 0)
+    const [start, end] = range.split('-').map((n) => parseInt(n, 10) || 0)
    return Math.floor((end - start + 1) / step)
  }

@@ -92,9 +97,9 @@ function calculateCardCount(range: string, step: number): number {
  return 1
 }

-function generateNumbersFromRange(range: string, step: number): number[] {
+function _generateNumbersFromRange(range: string, step: number): number[] {
  if (range.includes('-')) {
-    const [start, end] = range.split('-').map(n => parseInt(n) || 0)
+    const [start, end] = range.split('-').map((n) => parseInt(n, 10) || 0)
    const numbers: number[] = []
    for (let i = start; i <= end; i += step) {
      numbers.push(i)
@@ -104,26 +109,29 @@ function generateNumbersFromRange(range: string, step: number): number[] {
  }

  if (range.includes(',')) {
-    return range.split(',').map(n => parseInt(n.trim()) || 0)
+    return range.split(',').map((n) => parseInt(n.trim(), 10) || 0)
  }

-  return [parseInt(range) || 0]
+  return [parseInt(range, 10) || 0]
 }

 // Health check endpoint
 export async function GET() {
  try {
    const gen = await getGenerator()
-    const deps = await gen.checkDependencies?.() || { python: true, typst: true, qpdf: true }
+    const deps = (await gen.checkDependencies?.()) || { python: true, typst: true, qpdf: true }

    return NextResponse.json({
      status: 'healthy',
-      dependencies: deps
+      dependencies: deps,
    })
  } catch (error) {
-    return NextResponse.json({
-      status: 'unhealthy',
-      error: error instanceof Error ? error.message : 'Unknown error'
-    }, { status: 500 })
+    return NextResponse.json(
+      {
+        status: 'unhealthy',
+        error: error instanceof Error ? error.message : 'Unknown error',
+      },
+      { status: 500 }
+    )
  }
-}
+}
--- a/apps/web/src/app/api/players/[id]/route.ts
+++ b/apps/web/src/app/api/players/[id]/route.ts
@@ -0,0 +1,100 @@
+import { and, eq } from 'drizzle-orm'
+import { type NextRequest, NextResponse } from 'next/server'
+import { db, schema } from '@/db'
+import { getViewerId } from '@/lib/viewer'
+
+/**
+ * PATCH /api/players/[id]
+ * Update a player (only if it belongs to the current viewer)
+ */
+export async function PATCH(req: NextRequest, { params }: { params: { id: string } }) {
+  try {
+    const viewerId = await getViewerId()
+    const body = await req.json()
+
+    // Get user record (must exist if player exists)
+    const user = await db.query.users.findFirst({
+      where: eq(schema.users.guestId, viewerId),
+    })
+
+    if (!user) {
+      return NextResponse.json({ error: 'User not found' }, { status: 404 })
+    }
+
+    // Check if user has an active arcade session
+    // If so, prevent changing isActive status (players are locked during games)
+    if (body.isActive !== undefined) {
+      const activeSession = await db.query.arcadeSessions.findFirst({
+        where: eq(schema.arcadeSessions.userId, viewerId),
+      })
+
+      if (activeSession) {
+        return NextResponse.json(
+          {
+            error: 'Cannot modify active players during an active game session',
+            activeGame: activeSession.currentGame,
+            gameUrl: activeSession.gameUrl,
+          },
+          { status: 403 }
+        )
+      }
+    }
+
+    // Security: Only allow updating specific fields (excludes userId)
+    // Update player (only if it belongs to this user)
+    const [updatedPlayer] = await db
+      .update(schema.players)
+      .set({
+        ...(body.name !== undefined && { name: body.name }),
+        ...(body.emoji !== undefined && { emoji: body.emoji }),
+        ...(body.color !== undefined && { color: body.color }),
+        ...(body.isActive !== undefined && { isActive: body.isActive }),
+        // userId is explicitly NOT included - it comes from session
+      })
+      .where(and(eq(schema.players.id, params.id), eq(schema.players.userId, user.id)))
+      .returning()
+
+    if (!updatedPlayer) {
+      return NextResponse.json({ error: 'Player not found or unauthorized' }, { status: 404 })
+    }
+
+    return NextResponse.json({ player: updatedPlayer })
+  } catch (error) {
+    console.error('Failed to update player:', error)
+    return NextResponse.json({ error: 'Failed to update player' }, { status: 500 })
+  }
+}
+
+/**
+ * DELETE /api/players/[id]
+ * Delete a player (only if it belongs to the current viewer)
+ */
+export async function DELETE(_req: NextRequest, { params }: { params: { id: string } }) {
+  try {
+    const viewerId = await getViewerId()
+
+    // Get user record (must exist if player exists)
+    const user = await db.query.users.findFirst({
+      where: eq(schema.users.guestId, viewerId),
+    })
+
+    if (!user) {
+      return NextResponse.json({ error: 'User not found' }, { status: 404 })
+    }
+
+    // Delete player (only if it belongs to this user)
+    const [deletedPlayer] = await db
+      .delete(schema.players)
+      .where(and(eq(schema.players.id, params.id), eq(schema.players.userId, user.id)))
+      .returning()
+
+    if (!deletedPlayer) {
+      return NextResponse.json({ error: 'Player not found or unauthorized' }, { status: 404 })
+    }
+
+    return NextResponse.json({ success: true, player: deletedPlayer })
+  } catch (error) {
+    console.error('Failed to delete player:', error)
+    return NextResponse.json({ error: 'Failed to delete player' }, { status: 500 })
+  }
+}
--- a/apps/web/src/app/api/players/tests/arcade-session-validation.e2e.test.ts
+++ b/apps/web/src/app/api/players/tests/arcade-session-validation.e2e.test.ts
@@ -0,0 +1,255 @@
+/**
+ * @vitest-environment node
+ */
+
+import { eq } from 'drizzle-orm'
+import { NextRequest } from 'next/server'
+import { afterEach, beforeEach, describe, expect, it } from 'vitest'
+import { db, schema } from '../../../../db'
+import { PATCH } from '../[id]/route'
+
+/**
+ * Arcade Session Validation E2E Tests
+ *
+ * These tests verify that the PATCH /api/players/[id] endpoint
+ * correctly prevents isActive changes when user has an active arcade session.
+ */
+
+describe('PATCH /api/players/[id] - Arcade Session Validation', () => {
+  let testUserId: string
+  let testGuestId: string
+  let testPlayerId: string
+
+  beforeEach(async () => {
+    // Create a test user with unique guest ID
+    testGuestId = `test-guest-${Date.now()}-${Math.random().toString(36).slice(2)}`
+    const [user] = await db.insert(schema.users).values({ guestId: testGuestId }).returning()
+    testUserId = user.id
+
+    // Create a test player
+    const [player] = await db
+      .insert(schema.players)
+      .values({
+        userId: testUserId,
+        name: 'Test Player',
+        emoji: '😀',
+        color: '#3b82f6',
+        isActive: false,
+      })
+      .returning()
+    testPlayerId = player.id
+  })
+
+  afterEach(async () => {
+    // Clean up: delete test arcade session (if exists)
+    await db.delete(schema.arcadeSessions).where(eq(schema.arcadeSessions.userId, testGuestId))
+    // Clean up: delete test user (cascade deletes players)
+    await db.delete(schema.users).where(eq(schema.users.id, testUserId))
+  })
+
+  it('should return 403 when trying to change isActive with active arcade session', async () => {
+    // Create an active arcade session
+    const now = new Date()
+    await db.insert(schema.arcadeSessions).values({
+      userId: testGuestId,
+      currentGame: 'matching',
+      gameUrl: '/arcade/matching',
+      gameState: JSON.stringify({}),
+      activePlayers: JSON.stringify([testPlayerId]),
+      startedAt: now,
+      lastActivityAt: now,
+      expiresAt: new Date(now.getTime() + 3600000), // 1 hour from now
+      version: 1,
+    })
+
+    // Mock request to change isActive
+    const mockRequest = new NextRequest(`http://localhost:3000/api/players/${testPlayerId}`, {
+      method: 'PATCH',
+      headers: {
+        'Content-Type': 'application/json',
+        Cookie: `guest_id=${testGuestId}`,
+      },
+      body: JSON.stringify({ isActive: true }),
+    })
+
+    // Mock getViewerId by setting cookie
+    const response = await PATCH(mockRequest, { params: { id: testPlayerId } })
+    const data = await response.json()
+
+    // Should be rejected with 403
+    expect(response.status).toBe(403)
+    expect(data.error).toContain('Cannot modify active players during an active game session')
+    expect(data.activeGame).toBe('matching')
+    expect(data.gameUrl).toBe('/arcade/matching')
+
+    // Verify player isActive was NOT changed
+    const player = await db.query.players.findFirst({
+      where: eq(schema.players.id, testPlayerId),
+    })
+    expect(player?.isActive).toBe(false) // Still false
+  })
+
+  it('should allow isActive change when no active arcade session', async () => {
+    // No arcade session created
+
+    // Mock request to change isActive
+    const mockRequest = new NextRequest(`http://localhost:3000/api/players/${testPlayerId}`, {
+      method: 'PATCH',
+      headers: {
+        'Content-Type': 'application/json',
+        Cookie: `guest_id=${testGuestId}`,
+      },
+      body: JSON.stringify({ isActive: true }),
+    })
+
+    const response = await PATCH(mockRequest, { params: { id: testPlayerId } })
+    const data = await response.json()
+
+    // Should succeed
+    expect(response.status).toBe(200)
+    expect(data.player.isActive).toBe(true)
+
+    // Verify player isActive was changed
+    const player = await db.query.players.findFirst({
+      where: eq(schema.players.id, testPlayerId),
+    })
+    expect(player?.isActive).toBe(true)
+  })
+
+  it('should allow non-isActive changes even with active arcade session', async () => {
+    // Create an active arcade session
+    const now = new Date()
+    await db.insert(schema.arcadeSessions).values({
+      userId: testGuestId,
+      currentGame: 'matching',
+      gameUrl: '/arcade/matching',
+      gameState: JSON.stringify({}),
+      activePlayers: JSON.stringify([testPlayerId]),
+      startedAt: now,
+      lastActivityAt: now,
+      expiresAt: new Date(now.getTime() + 3600000), // 1 hour from now
+      version: 1,
+    })
+
+    // Mock request to change name/emoji/color (NOT isActive)
+    const mockRequest = new NextRequest(`http://localhost:3000/api/players/${testPlayerId}`, {
+      method: 'PATCH',
+      headers: {
+        'Content-Type': 'application/json',
+        Cookie: `guest_id=${testGuestId}`,
+      },
+      body: JSON.stringify({
+        name: 'Updated Name',
+        emoji: '🎉',
+        color: '#ff0000',
+      }),
+    })
+
+    const response = await PATCH(mockRequest, { params: { id: testPlayerId } })
+    const data = await response.json()
+
+    // Should succeed
+    expect(response.status).toBe(200)
+    expect(data.player.name).toBe('Updated Name')
+    expect(data.player.emoji).toBe('🎉')
+    expect(data.player.color).toBe('#ff0000')
+
+    // Verify changes were applied
+    const player = await db.query.players.findFirst({
+      where: eq(schema.players.id, testPlayerId),
+    })
+    expect(player?.name).toBe('Updated Name')
+    expect(player?.emoji).toBe('🎉')
+    expect(player?.color).toBe('#ff0000')
+  })
+
+  it('should allow isActive change after arcade session ends', async () => {
+    // Create an active arcade session
+    const now = new Date()
+    await db.insert(schema.arcadeSessions).values({
+      userId: testGuestId,
+      currentGame: 'matching',
+      gameUrl: '/arcade/matching',
+      gameState: JSON.stringify({}),
+      activePlayers: JSON.stringify([testPlayerId]),
+      startedAt: now,
+      lastActivityAt: now,
+      expiresAt: new Date(now.getTime() + 3600000), // 1 hour from now
+      version: 1,
+    })
+
+    // End the session
+    await db.delete(schema.arcadeSessions).where(eq(schema.arcadeSessions.userId, testGuestId))
+
+    // Mock request to change isActive
+    const mockRequest = new NextRequest(`http://localhost:3000/api/players/${testPlayerId}`, {
+      method: 'PATCH',
+      headers: {
+        'Content-Type': 'application/json',
+        Cookie: `guest_id=${testGuestId}`,
+      },
+      body: JSON.stringify({ isActive: true }),
+    })
+
+    const response = await PATCH(mockRequest, { params: { id: testPlayerId } })
+    const data = await response.json()
+
+    // Should succeed
+    expect(response.status).toBe(200)
+    expect(data.player.isActive).toBe(true)
+  })
+
+  it('should handle multiple players with different isActive states', async () => {
+    // Create additional players
+    const [player2] = await db
+      .insert(schema.players)
+      .values({
+        userId: testUserId,
+        name: 'Player 2',
+        emoji: '😎',
+        color: '#8b5cf6',
+        isActive: true,
+      })
+      .returning()
+
+    // Create arcade session
+    const now2 = new Date()
+    await db.insert(schema.arcadeSessions).values({
+      userId: testGuestId,
+      currentGame: 'matching',
+      gameUrl: '/arcade/matching',
+      gameState: JSON.stringify({}),
+      activePlayers: JSON.stringify([testPlayerId, player2.id]),
+      startedAt: now2,
+      lastActivityAt: now2,
+      expiresAt: new Date(now2.getTime() + 3600000), // 1 hour from now
+      version: 1,
+    })
+
+    // Try to toggle player1 (inactive -> active) - should fail
+    const request1 = new NextRequest(`http://localhost:3000/api/players/${testPlayerId}`, {
+      method: 'PATCH',
+      headers: {
+        'Content-Type': 'application/json',
+        Cookie: `guest_id=${testGuestId}`,
+      },
+      body: JSON.stringify({ isActive: true }),
+    })
+
+    const response1 = await PATCH(request1, { params: { id: testPlayerId } })
+    expect(response1.status).toBe(403)
+
+    // Try to toggle player2 (active -> inactive) - should also fail
+    const request2 = new NextRequest(`http://localhost:3000/api/players/${player2.id}`, {
+      method: 'PATCH',
+      headers: {
+        'Content-Type': 'application/json',
+        Cookie: `guest_id=${testGuestId}`,
+      },
+      body: JSON.stringify({ isActive: false }),
+    })
+
+    const response2 = await PATCH(request2, { params: { id: player2.id } })
+    expect(response2.status).toBe(403)
+  })
+})
--- a/apps/web/src/app/api/players/route.ts
+++ b/apps/web/src/app/api/players/route.ts
@@ -0,0 +1,91 @@
+import { eq } from 'drizzle-orm'
+import { type NextRequest, NextResponse } from 'next/server'
+import { db, schema } from '@/db'
+import { getViewerId } from '@/lib/viewer'
+
+/**
+ * GET /api/players
+ * List all players for the current viewer (guest or user)
+ */
+export async function GET() {
+  try {
+    const viewerId = await getViewerId()
+
+    // Get or create user record
+    const user = await getOrCreateUser(viewerId)
+
+    // Get all players for this user
+    const players = await db.query.players.findMany({
+      where: eq(schema.players.userId, user.id),
+      orderBy: (players, { desc }) => [desc(players.createdAt)],
+    })
+
+    return NextResponse.json({ players })
+  } catch (error) {
+    console.error('Failed to fetch players:', error)
+    return NextResponse.json({ error: 'Failed to fetch players' }, { status: 500 })
+  }
+}
+
+/**
+ * POST /api/players
+ * Create a new player for the current viewer
+ */
+export async function POST(req: NextRequest) {
+  try {
+    const viewerId = await getViewerId()
+    const body = await req.json()
+
+    // Validate required fields
+    if (!body.name || !body.emoji || !body.color) {
+      return NextResponse.json(
+        { error: 'Missing required fields: name, emoji, color' },
+        { status: 400 }
+      )
+    }
+
+    // Get or create user record
+    const user = await getOrCreateUser(viewerId)
+
+    // Create player
+    const [player] = await db
+      .insert(schema.players)
+      .values({
+        userId: user.id,
+        name: body.name,
+        emoji: body.emoji,
+        color: body.color,
+        isActive: body.isActive ?? false,
+      })
+      .returning()
+
+    return NextResponse.json({ player }, { status: 201 })
+  } catch (error) {
+    console.error('Failed to create player:', error)
+    return NextResponse.json({ error: 'Failed to create player' }, { status: 500 })
+  }
+}
+
+/**
+ * Get or create a user record for the given viewer ID (guest or user)
+ */
+async function getOrCreateUser(viewerId: string) {
+  // Try to find existing user by guest ID
+  let user = await db.query.users.findFirst({
+    where: eq(schema.users.guestId, viewerId),
+  })
+
+  // If no user exists, create one
+  if (!user) {
+    const [newUser] = await db
+      .insert(schema.users)
+      .values({
+        guestId: viewerId,
+      })
+      .returning()
+
+    user = newUser
+  }
+
+  return user
+}
--- a/apps/web/src/app/api/preview/route.ts
+++ b/apps/web/src/app/api/preview/route.ts
@@ -1,164 +0,0 @@
-import { NextRequest, NextResponse } from 'next/server'
-import { generateSorobanSVG } from '@/lib/typst-soroban'
-
-export async function POST(request: NextRequest) {
-  try {
-    const config = await request.json()
-
-    // Debug: log the received config
-    console.log('🔍 Preview config:', JSON.stringify(config, null, 2))
-
-    // Ensure range is set with a default
-    if (!config.range) {
-      config.range = '0-9'
-    }
-
-    // For preview, limit to a few numbers and use SVG format for fast rendering
-    const previewConfig = {
-      ...config,
-      range: getPreviewRange(config.range),
-      format: 'svg', // Use SVG format for preview
-      cardsPerPage: 6 // Standard card layout
-    }
-
-    console.log('🔍 Processed preview config:', JSON.stringify(previewConfig, null, 2))
-
-    // Generate real SVG preview using typst.ts
-    console.log('🚀 Generating soroban SVG preview via typst.ts')
-
-    try {
-      // Parse the numbers from the range for individual cards
-      const numbers = parseNumbersFromRange(getPreviewRange(config.range))
-      console.log('🔍 Generating individual SVGs for numbers:', numbers)
-
-      // Generate individual SVGs for each number using typst.ts
-      const samples = []
-      for (const number of numbers) {
-        try {
-          const typstConfig = {
-            number: number,
-            beadShape: previewConfig.beadShape || 'diamond',
-            colorScheme: previewConfig.colorScheme || 'place-value',
-            hideInactiveBeads: previewConfig.hideInactiveBeads || false,
-            scaleFactor: previewConfig.scaleFactor || 1.0,
-            width: '200pt',
-            height: '250pt'
-          }
-          console.log(`🔍 Generating typst.ts SVG for number ${number}`)
-          const svg = await generateSorobanSVG(typstConfig)
-          console.log(`✅ Generated typst.ts SVG for ${number}, length: ${svg.length}`)
-          samples.push({
-            number,
-            front: svg,
-            back: number.toString()
-          })
-        } catch (error) {
-          console.error(`❌ Failed to generate SVG for number ${number}:`, error instanceof Error ? error.message : error)
-          samples.push({
-            number,
-            front: `<svg width="200" height="300" viewBox="0 0 200 300" xmlns="http://www.w3.org/2000/svg">
-              <rect x="10" y="10" width="180" height="280" fill="none" stroke="#ccc" stroke-width="2"/>
-              <line x1="20" y1="150" x2="180" y2="150" stroke="#ccc" stroke-width="2"/>
-              <text x="100" y="160" text-anchor="middle" font-size="24" fill="#666">SVG Error</text>
-              <text x="100" y="180" text-anchor="middle" font-size="16" fill="#999">${number}</text>
-            </svg>`,
-            back: number.toString()
-          })
-        }
-      }
-
-      return NextResponse.json({
-        count: numbers.length,
-        samples,
-        note: 'Real individual SVGs generated by typst.ts'
-      })
-
-    } catch (error) {
-      console.error('⚠️ Typst.ts SVG generation failed, using fallback preview:', error instanceof Error ? error.message : error)
-      return NextResponse.json(getMockPreviewData(config))
-    }
-
-  } catch (error) {
-    console.error('❌ Preview generation failed:', error)
-
-    // Always fall back to mock data for preview
-    const config = await request.json().catch(() => ({ range: '0-9' }))
-    return NextResponse.json(getMockPreviewData(config))
-  }
-}
-
-// Helper function to parse numbers from range string
-function parseNumbersFromRange(range: string): number[] {
-  if (!range) return [0, 1, 2]
-
-  if (range.includes('-')) {
-    const [start] = range.split('-')
-    const startNum = parseInt(start) || 0
-    return [startNum, startNum + 1, startNum + 2]
-  }
-
-  if (range.includes(',')) {
-    return range.split(',').slice(0, 3).map(n => parseInt(n.trim()) || 0)
-  }
-
-  const num = parseInt(range) || 0
-  return [num, num + 1, num + 2]
-}
-
-// Helper function to limit range for preview
-function getPreviewRange(range: string): string {
-  if (!range) return '0,1,2'
-
-  if (range.includes('-')) {
-    const [start] = range.split('-')
-    const startNum = parseInt(start) || 0
-    return `${startNum},${startNum + 1},${startNum + 2}`
-  }
-
-  if (range.includes(',')) {
-    const numbers = range.split(',').slice(0, 3)
-    return numbers.join(',')
-  }
-
-  return range
-}
-
-// Mock preview data for development and fallback
-function getMockPreviewData(config: any) {
-  const range = config.range || '0-9'
-  let numbers: number[]
-
-  if (range.includes('-')) {
-    const [start] = range.split('-')
-    const startNum = parseInt(start) || 0
-    numbers = [startNum, startNum + 1, startNum + 2]
-  } else if (range.includes(',')) {
-    numbers = range.split(',').slice(0, 3).map((n: string) => parseInt(n.trim()) || 0)
-  } else {
-    const num = parseInt(range) || 0
-    numbers = [num, num + 1, num + 2]
-  }
-
-  return {
-    count: numbers.length,
-    samples: numbers.map(number => ({
-      number,
-      front: `<svg width="200" height="300" viewBox="0 0 200 300" xmlns="http://www.w3.org/2000/svg">
-        <rect x="10" y="10" width="180" height="280" fill="none" stroke="#ccc" stroke-width="2"/>
-        <line x1="20" y1="150" x2="180" y2="150" stroke="#ccc" stroke-width="2"/>
-        <text x="100" y="160" text-anchor="middle" font-size="24" fill="#666">Preview Error</text>
-        <text x="100" y="180" text-anchor="middle" font-size="16" fill="#999">${number}</text>
-      </svg>`,
-      back: number.toString()
-    }))
-  }
-}
-
-// Health check endpoint
-export async function GET() {
-  return NextResponse.json({
-    status: 'healthy',
-    endpoint: 'preview',
-    message: 'Preview API is running'
-  })
-}
--- a/apps/web/src/app/api/typst-svg/route.ts
+++ b/apps/web/src/app/api/typst-svg/route.ts
@@ -1,154 +0,0 @@
-import { NextRequest, NextResponse } from 'next/server'
-import { $typst } from '@myriaddreamin/typst.ts/dist/esm/contrib/snippet.mjs'
-import fs from 'fs'
-import path from 'path'
-
-export interface TypstSVGRequest {
-  number: number
-  beadShape?: 'diamond' | 'circle' | 'square'
-  colorScheme?: 'monochrome' | 'place-value' | 'heaven-earth' | 'alternating'
-  colorPalette?: 'default' | 'colorblind' | 'mnemonic' | 'grayscale' | 'nature'
-  hideInactiveBeads?: boolean
-  showEmptyColumns?: boolean
-  columns?: number | 'auto'
-  scaleFactor?: number
-  width?: string
-  height?: string
-  fontSize?: string
-  fontFamily?: string
-  transparent?: boolean
-  coloredNumerals?: boolean
-}
-
-// Cache for template content
-let flashcardsTemplate: string | null = null
-
-async function getFlashcardsTemplate(): Promise<string> {
-  if (flashcardsTemplate) {
-    return flashcardsTemplate
-  }
-
-  try {
-    const { getTemplatePath } = require('@soroban/templates')
-    const templatePath = getTemplatePath('flashcards.typ')
-    flashcardsTemplate = fs.readFileSync(templatePath, 'utf-8')
-    return flashcardsTemplate
-  } catch (error) {
-    console.error('Failed to load flashcards template:', error)
-    throw new Error('Template loading failed')
-  }
-}
-
-function processBeadAnnotations(svg: string): string {
-  const { extractBeadAnnotations } = require('@soroban/templates')
-  const result = extractBeadAnnotations(svg)
-
-  if (result.warnings.length > 0) {
-    console.log('ℹ️ SVG bead processing warnings:', result.warnings)
-  }
-
-  console.log(`🔗 Processed ${result.count} bead links into data attributes`)
-  return result.processedSVG
-}
-
-function createTypstContent(config: TypstSVGRequest, template: string): string {
-  const {
-    number,
-    beadShape = 'diamond',
-    colorScheme = 'place-value',
-    colorPalette = 'default',
-    hideInactiveBeads = false,
-    showEmptyColumns = false,
-    columns = 'auto',
-    scaleFactor = 1.0,
-    width = '120pt',
-    height = '160pt',
-    fontSize = '48pt',
-    fontFamily = 'DejaVu Sans',
-    transparent = false,
-    coloredNumerals = false
-  } = config
-
-  return `
-${template}
-
-#set page(
-  width: ${width},
-  height: ${height},
-  margin: 0pt,
-  fill: ${transparent ? 'none' : 'white'}
-)
-
-#set text(font: "${fontFamily}", size: ${fontSize}, fallback: true)
-
-#align(center + horizon)[
-  #box(
-    width: ${width} - 2 * (${width} * 0.05),
-    height: ${height} - 2 * (${height} * 0.05)
-  )[
-    #align(center + horizon)[
-      #scale(x: ${scaleFactor * 100}%, y: ${scaleFactor * 100}%)[
-        #draw-soroban(
-          ${number},
-          columns: ${columns},
-          show-empty: ${showEmptyColumns},
-          hide-inactive: ${hideInactiveBeads},
-          bead-shape: "${beadShape}",
-          color-scheme: "${colorScheme}",
-          color-palette: "${colorPalette}",
-          base-size: 1.0
-        )
-      ]
-    ]
-  ]
-]
-`
-}
-
-export async function POST(request: NextRequest) {
-  try {
-    const config: TypstSVGRequest = await request.json()
-
-    console.log('🎨 Generating typst.ts SVG for number:', config.number)
-
-    // Load template
-    const template = await getFlashcardsTemplate()
-
-    // Create typst content
-    const typstContent = createTypstContent(config, template)
-
-    // Generate SVG using typst.ts
-    const rawSvg = await $typst.svg({ mainContent: typstContent })
-
-    // Post-process to convert bead annotations to data attributes
-    const svg = processBeadAnnotations(rawSvg)
-
-    console.log('✅ Generated and processed typst.ts SVG, length:', svg.length)
-
-    return NextResponse.json({
-      svg,
-      success: true,
-      number: config.number
-    })
-
-  } catch (error) {
-    console.error('❌ Typst SVG generation failed:', error)
-
-    return NextResponse.json(
-      {
-        error: error instanceof Error ? error.message : 'Unknown error',
-        success: false
-      },
-      { status: 500 }
-    )
-  }
-}
-
-// Health check
-export async function GET() {
-  return NextResponse.json({
-    status: 'healthy',
-    endpoint: 'typst-svg',
-    message: 'Typst.ts SVG generation API is running'
-  })
-}
--- a/apps/web/src/app/api/typst-template/route.ts
+++ b/apps/web/src/app/api/typst-template/route.ts
@@ -1,25 +0,0 @@
-import { NextResponse } from 'next/server'
-import fs from 'fs'
-import { getTemplatePath } from '@soroban/templates'
-
-// API endpoint to serve the flashcards.typ template content
-export async function GET() {
-  try {
-    const templatePath = getTemplatePath('flashcards.typ');
-    const flashcardsTemplate = fs.readFileSync(templatePath, 'utf-8')
-
-    return NextResponse.json({
-      template: flashcardsTemplate,
-      success: true
-    })
-  } catch (error) {
-    console.error('Failed to load typst template:', error)
-    return NextResponse.json(
-      {
-        error: 'Failed to load template',
-        success: false
-      },
-      { status: 500 }
-    )
-  }
-}
--- a/apps/web/src/app/api/user-stats/route.ts
+++ b/apps/web/src/app/api/user-stats/route.ts
@@ -0,0 +1,120 @@
+import { eq } from 'drizzle-orm'
+import { type NextRequest, NextResponse } from 'next/server'
+import { db, schema } from '@/db'
+import { getViewerId } from '@/lib/viewer'
+
+/**
+ * GET /api/user-stats
+ * Get user statistics for the current viewer
+ */
+export async function GET() {
+  try {
+    const viewerId = await getViewerId()
+
+    // Get user record
+    const user = await db.query.users.findFirst({
+      where: eq(schema.users.guestId, viewerId),
+    })
+
+    if (!user) {
+      // No user yet, return default stats
+      return NextResponse.json({
+        stats: {
+          gamesPlayed: 0,
+          totalWins: 0,
+          favoriteGameType: null,
+          bestTime: null,
+          highestAccuracy: 0,
+        },
+      })
+    }
+
+    // Get stats record
+    let stats = await db.query.userStats.findFirst({
+      where: eq(schema.userStats.userId, user.id),
+    })
+
+    // If no stats record exists, create one with defaults
+    if (!stats) {
+      const [newStats] = await db
+        .insert(schema.userStats)
+        .values({
+          userId: user.id,
+        })
+        .returning()
+
+      stats = newStats
+    }
+
+    return NextResponse.json({ stats })
+  } catch (error) {
+    console.error('Failed to fetch user stats:', error)
+    return NextResponse.json({ error: 'Failed to fetch user stats' }, { status: 500 })
+  }
+}
+
+/**
+ * PATCH /api/user-stats
+ * Update user statistics for the current viewer
+ */
+export async function PATCH(req: NextRequest) {
+  try {
+    const viewerId = await getViewerId()
+    const body = await req.json()
+
+    // Get or create user record
+    let user = await db.query.users.findFirst({
+      where: eq(schema.users.guestId, viewerId),
+    })
+
+    if (!user) {
+      // Create user if it doesn't exist
+      const [newUser] = await db
+        .insert(schema.users)
+        .values({
+          guestId: viewerId,
+        })
+        .returning()
+
+      user = newUser
+    }
+
+    // Get existing stats
+    const stats = await db.query.userStats.findFirst({
+      where: eq(schema.userStats.userId, user.id),
+    })
+
+    // Prepare update values
+    const updates: any = {}
+    if (body.gamesPlayed !== undefined) updates.gamesPlayed = body.gamesPlayed
+    if (body.totalWins !== undefined) updates.totalWins = body.totalWins
+    if (body.favoriteGameType !== undefined) updates.favoriteGameType = body.favoriteGameType
+    if (body.bestTime !== undefined) updates.bestTime = body.bestTime
+    if (body.highestAccuracy !== undefined) updates.highestAccuracy = body.highestAccuracy
+
+    if (stats) {
+      // Update existing stats
+      const [updatedStats] = await db
+        .update(schema.userStats)
+        .set(updates)
+        .where(eq(schema.userStats.userId, user.id))
+        .returning()
+
+      return NextResponse.json({ stats: updatedStats })
+    } else {
+      // Create new stats record
+      const [newStats] = await db
+        .insert(schema.userStats)
+        .values({
+          userId: user.id,
+          ...updates,
+        })
+        .returning()
+
+      return NextResponse.json({ stats: newStats }, { status: 201 })
+    }
+  } catch (error) {
+    console.error('Failed to update user stats:', error)
+    return NextResponse.json({ error: 'Failed to update user stats' }, { status: 500 })
+  }
+}
--- a/apps/web/src/app/api/viewer/route.ts
+++ b/apps/web/src/app/api/viewer/route.ts
@@ -0,0 +1,16 @@
+import { NextResponse } from 'next/server'
+import { getViewerId } from '@/lib/viewer'
+
+/**
+ * GET /api/viewer
+ *
+ * Returns the current viewer's ID (guest or authenticated user)
+ */
+export async function GET() {
+  try {
+    const viewerId = await getViewerId()
+    return NextResponse.json({ viewerId })
+  } catch (_error) {
+    return NextResponse.json({ error: 'No valid viewer session found' }, { status: 401 })
+  }
+}
--- a/apps/web/src/app/arcade/complement-race/components/AISystem/SpeechBubble.tsx
+++ b/apps/web/src/app/arcade/complement-race/components/AISystem/SpeechBubble.tsx
@@ -0,0 +1,62 @@
+'use client'
+
+import { useEffect, useState } from 'react'
+
+interface SpeechBubbleProps {
+  message: string
+  onHide: () => void
+}
+
+export function SpeechBubble({ message, onHide }: SpeechBubbleProps) {
+  const [isVisible, setIsVisible] = useState(true)
+
+  useEffect(() => {
+    // Auto-hide after 3.5s (line 11749-11752)
+    const timer = setTimeout(() => {
+      setIsVisible(false)
+      setTimeout(onHide, 300) // Wait for fade-out animation
+    }, 3500)
+
+    return () => clearTimeout(timer)
+  }, [onHide])
+
+  return (
+    <div
+      style={{
+        position: 'absolute',
+        bottom: 'calc(100% + 10px)',
+        left: '50%',
+        transform: 'translateX(-50%)',
+        background: 'white',
+        borderRadius: '15px',
+        padding: '10px 15px',
+        boxShadow: '0 4px 12px rgba(0,0,0,0.2)',
+        fontSize: '14px',
+        whiteSpace: 'nowrap',
+        opacity: isVisible ? 1 : 0,
+        transition: 'opacity 0.3s ease',
+        zIndex: 10,
+        pointerEvents: 'none',
+        maxWidth: '250px',
+        textAlign: 'center',
+      }}
+    >
+      {message}
+      {/* Tail pointing down */}
+      <div
+        style={{
+          position: 'absolute',
+          bottom: '-8px',
+          left: '50%',
+          transform: 'translateX(-50%)',
+          width: 0,
+          height: 0,
+          borderLeft: '8px solid transparent',
+          borderRight: '8px solid transparent',
+          borderTop: '8px solid white',
+          filter: 'drop-shadow(0 2px 2px rgba(0,0,0,0.1))',
+        }}
+      />
+    </div>
+  )
+}
--- a/apps/web/src/app/arcade/complement-race/components/AISystem/aiCommentary.ts
+++ b/apps/web/src/app/arcade/complement-race/components/AISystem/aiCommentary.ts
@@ -0,0 +1,154 @@
+import type { AIRacer } from '../../lib/gameTypes'
+
+export type CommentaryContext =
+  | 'ahead'
+  | 'behind'
+  | 'adaptive_struggle'
+  | 'adaptive_mastery'
+  | 'player_passed'
+  | 'ai_passed'
+  | 'lapped'
+  | 'desperate_catchup'
+
+// Swift AI - Competitive personality (lines 11768-11834)
+export const swiftAICommentary: Record<CommentaryContext, string[]> = {
+  ahead: [
+    '💨 Eat my dust!',
+    '🔥 Too slow for me!',
+    "⚡ You can't catch me!",
+    "🚀 I'm built for speed!",
+    '🏃‍♂️ This is way too easy!',
+  ],
+  behind: [
+    '😤 Not over yet!',
+    "💪 I'm just getting started!",
+    '🔥 Watch me catch up to you!',
+    "⚡ I'm coming for you!",
+    '🏃‍♂️ This is my comeback!',
+  ],
+  adaptive_struggle: [
+    '😏 You struggling much?',
+    '🤖 Math is easy for me!',
+    '⚡ You need to think faster!',
+    '🔥 Need me to slow down?',
+  ],
+  adaptive_mastery: [
+    "😮 You're actually impressive!",
+    "🤔 You're getting faster...",
+    '😤 Time for me to step it up!',
+    '⚡ Not bad for a human!',
+  ],
+  player_passed: [
+    '😠 No way you just passed me!',
+    "🔥 This isn't over!",
+    "💨 I'm just getting warmed up!",
+    "😤 Your lucky streak won't last!",
+    "⚡ I'll be back in front of you soon!",
+  ],
+  ai_passed: [
+    '💨 See ya later, slowpoke!',
+    '😎 Thanks for the warm-up!',
+    "🔥 This is how it's done!",
+    "⚡ I'll see you at the finish line!",
+    '💪 Try to keep up with me!',
+  ],
+  lapped: [
+    '😡 You just lapped me?! No way!',
+    '🤬 This is embarrassing for me!',
+    "😤 I'm not going down without a fight!",
+    '💢 How did you get so far ahead?!',
+    '🔥 Time to show you my real speed!',
+    "😠 You won't stay ahead for long!",
+  ],
+  desperate_catchup: [
+    "🚨 TURBO MODE ACTIVATED! I'm coming for you!",
+    '💥 You forced me to unleash my true power!',
+    '🔥 NO MORE MR. NICE AI! Time to go all out!',
+    "⚡ I'm switching to MAXIMUM OVERDRIVE!",
+    "😤 You made me angry - now you'll see what I can do!",
+    "🚀 AFTERBURNERS ENGAGED! This isn't over!",
+  ],
+}
+
+// Math Bot - Analytical personality (lines 11835-11901)
+export const mathBotCommentary: Record<CommentaryContext, string[]> = {
+  ahead: [
+    '📊 My performance is optimal!',
+    '🤖 My logic beats your speed!',
+    '📈 I have 87% win probability!',
+    "⚙️ I'm perfectly calibrated!",
+    '🔬 Science prevails over you!',
+  ],
+  behind: [
+    '🤔 Recalculating my strategy...',
+    "📊 You're exceeding my projections!",
+    '⚙️ Adjusting my parameters!',
+    "🔬 I'm analyzing your technique!",
+    "📈 You're a statistical anomaly!",
+  ],
+  adaptive_struggle: [
+    '📊 I detect inefficiencies in you!',
+    '🔬 You should focus on patterns!',
+    '⚙️ Use that extra time wisely!',
+    '📈 You have room for improvement!',
+  ],
+  adaptive_mastery: [
+    '🤖 Your optimization is excellent!',
+    '📊 Your metrics are impressive!',
+    "⚙️ I'm updating my models because of you!",
+    '🔬 You have near-AI efficiency!',
+  ],
+  player_passed: [
+    '🤖 Your strategy is fascinating!',
+    "📊 You're an unexpected variable!",
+    "⚙️ I'm adjusting my algorithms...",
+    '🔬 Your execution is impressive!',
+    "📈 I'm recalculating the odds!",
+  ],
+  ai_passed: [
+    '🤖 My efficiency is optimized!',
+    '📊 Just as I calculated!',
+    '⚙️ All my systems nominal!',
+    '🔬 My logic prevails over you!',
+    "📈 I'm at 96% confidence level!",
+  ],
+  lapped: [
+    '🤖 Error: You have exceeded my projections!',
+    '📊 This outcome has 0.3% probability!',
+    '⚙️ I need to recalibrate my systems!',
+    '🔬 Your performance is... statistically improbable!',
+    '📈 My confidence level just dropped to 12%!',
+    '🤔 I must analyze your methodology!',
+  ],
+  desperate_catchup: [
+    '🤖 EMERGENCY PROTOCOL ACTIVATED! Initiating maximum speed!',
+    '🚨 CRITICAL GAP DETECTED! Engaging catchup algorithms!',
+    '⚙️ OVERCLOCKING MY PROCESSORS! Prepare for rapid acceleration!',
+    '📊 PROBABILITY OF FAILURE: UNACCEPTABLE! Switching to turbo mode!',
+    "🔬 HYPOTHESIS: You're about to see my true potential!",
+    '📈 CONFIDENCE LEVEL: RISING! My comeback protocol is online!',
+  ],
+}
+
+// Get AI commentary message (lines 11636-11657)
+export function getAICommentary(
+  racer: AIRacer,
+  context: CommentaryContext,
+  _playerProgress: number,
+  _aiProgress: number
+): string | null {
+  // Check cooldown (line 11759-11761)
+  const now = Date.now()
+  if (now - racer.lastComment < racer.commentCooldown) {
+    return null
+  }
+
+  // Select message set based on personality and context
+  const messages =
+    racer.personality === 'competitive' ? swiftAICommentary[context] : mathBotCommentary[context]
+
+  if (!messages || messages.length === 0) return null
+
+  // Return random message
+  return messages[Math.floor(Math.random() * messages.length)]
+}
--- a/apps/web/src/app/arcade/complement-race/components/AbacusTarget.tsx
+++ b/apps/web/src/app/arcade/complement-race/components/AbacusTarget.tsx
@@ -0,0 +1,36 @@
+'use client'
+
+import { AbacusReact } from '@soroban/abacus-react'
+
+interface AbacusTargetProps {
+  number: number // The complement number to display
+}
+
+/**
+ * Displays a small abacus showing a complement number inline in the equation
+ * Used to help learners recognize the abacus representation of complement numbers
+ */
+export function AbacusTarget({ number }: AbacusTargetProps) {
+  return (
+    <div
+      style={{
+        display: 'inline-flex',
+        alignItems: 'center',
+        justifyContent: 'center',
+        lineHeight: 0,
+      }}
+    >
+      <AbacusReact
+        value={number}
+        columns={1}
+        interactive={false}
+        showNumbers={false}
+        hideInactiveBeads={true}
+        scaleFactor={0.72}
+        customStyles={{
+          columnPosts: { opacity: 0 },
+        }}
+      />
+    </div>
+  )
+}
--- a/apps/web/src/app/arcade/complement-race/components/ComplementRaceGame.tsx
+++ b/apps/web/src/app/arcade/complement-race/components/ComplementRaceGame.tsx
@@ -0,0 +1,373 @@
+'use client'
+
+import { useComplementRace } from '../context/ComplementRaceContext'
+import { GameControls } from './GameControls'
+import { GameCountdown } from './GameCountdown'
+import { GameDisplay } from './GameDisplay'
+import { GameIntro } from './GameIntro'
+import { GameResults } from './GameResults'
+
+export function ComplementRaceGame() {
+  const { state } = useComplementRace()
+
+  return (
+    <div
+      data-component="game-page-root"
+      style={{
+        flex: 1,
+        display: 'flex',
+        flexDirection: 'column',
+        overflow: 'hidden',
+        padding: '20px 8px',
+        minHeight: '100vh',
+        maxHeight: '100vh',
+        background:
+          state.style === 'sprint'
+            ? 'linear-gradient(to bottom, #2563eb 0%, #60a5fa 100%)'
+            : 'radial-gradient(ellipse at center, #8db978 0%, #7ba565 40%, #6a9354 100%)',
+        position: 'relative',
+      }}
+    >
+      {/* Background pattern - subtle grass texture */}
+      {state.style !== 'sprint' && (
+        <div
+          style={{
+            position: 'absolute',
+            inset: 0,
+            overflow: 'hidden',
+            pointerEvents: 'none',
+            zIndex: 0,
+            opacity: 0.15,
+          }}
+        >
+          <svg width="100%" height="100%">
+            <defs>
+              <pattern
+                id="grass-texture"
+                x="0"
+                y="0"
+                width="40"
+                height="40"
+                patternUnits="userSpaceOnUse"
+              >
+                <rect width="40" height="40" fill="transparent" />
+                <line x1="2" y1="5" x2="8" y2="5" stroke="#2d5016" strokeWidth="1" opacity="0.3" />
+                <line
+                  x1="15"
+                  y1="8"
+                  x2="20"
+                  y2="8"
+                  stroke="#2d5016"
+                  strokeWidth="1"
+                  opacity="0.25"
+                />
+                <line
+                  x1="25"
+                  y1="12"
+                  x2="32"
+                  y2="12"
+                  stroke="#2d5016"
+                  strokeWidth="1"
+                  opacity="0.2"
+                />
+                <line
+                  x1="5"
+                  y1="18"
+                  x2="12"
+                  y2="18"
+                  stroke="#2d5016"
+                  strokeWidth="1"
+                  opacity="0.3"
+                />
+                <line
+                  x1="28"
+                  y1="22"
+                  x2="35"
+                  y2="22"
+                  stroke="#2d5016"
+                  strokeWidth="1"
+                  opacity="0.25"
+                />
+                <line
+                  x1="10"
+                  y1="30"
+                  x2="16"
+                  y2="30"
+                  stroke="#2d5016"
+                  strokeWidth="1"
+                  opacity="0.2"
+                />
+                <line
+                  x1="22"
+                  y1="35"
+                  x2="28"
+                  y2="35"
+                  stroke="#2d5016"
+                  strokeWidth="1"
+                  opacity="0.3"
+                />
+              </pattern>
+            </defs>
+            <rect width="100%" height="100%" fill="url(#grass-texture)" />
+          </svg>
+        </div>
+      )}
+
+      {/* Subtle tree clusters around edges - top-down view with gentle sway */}
+      {state.style !== 'sprint' && (
+        <div
+          style={{
+            position: 'absolute',
+            inset: 0,
+            overflow: 'hidden',
+            pointerEvents: 'none',
+            zIndex: 0,
+          }}
+        >
+          {/* Top-left tree cluster */}
+          <div
+            style={{
+              position: 'absolute',
+              top: '5%',
+              left: '3%',
+              width: '80px',
+              height: '80px',
+              borderRadius: '50%',
+              background: 'radial-gradient(circle, #4a7c3a 0%, #3d6630 60%, transparent 70%)',
+              opacity: 0.2,
+              filter: 'blur(4px)',
+              animation: 'treeSway1 8s ease-in-out infinite',
+            }}
+          />
+
+          {/* Top-right tree cluster */}
+          <div
+            style={{
+              position: 'absolute',
+              top: '8%',
+              right: '5%',
+              width: '100px',
+              height: '100px',
+              borderRadius: '50%',
+              background: 'radial-gradient(circle, #4a7c3a 0%, #3d6630 60%, transparent 70%)',
+              opacity: 0.18,
+              filter: 'blur(5px)',
+              animation: 'treeSway2 10s ease-in-out infinite',
+            }}
+          />
+
+          {/* Bottom-left tree cluster */}
+          <div
+            style={{
+              position: 'absolute',
+              bottom: '10%',
+              left: '8%',
+              width: '90px',
+              height: '90px',
+              borderRadius: '50%',
+              background: 'radial-gradient(circle, #4a7c3a 0%, #3d6630 60%, transparent 70%)',
+              opacity: 0.15,
+              filter: 'blur(4px)',
+              animation: 'treeSway1 9s ease-in-out infinite reverse',
+            }}
+          />
+
+          {/* Bottom-right tree cluster */}
+          <div
+            style={{
+              position: 'absolute',
+              bottom: '5%',
+              right: '4%',
+              width: '110px',
+              height: '110px',
+              borderRadius: '50%',
+              background: 'radial-gradient(circle, #4a7c3a 0%, #3d6630 60%, transparent 70%)',
+              opacity: 0.2,
+              filter: 'blur(6px)',
+              animation: 'treeSway2 11s ease-in-out infinite',
+            }}
+          />
+
+          {/* Additional smaller clusters for depth */}
+          <div
+            style={{
+              position: 'absolute',
+              top: '40%',
+              left: '2%',
+              width: '60px',
+              height: '60px',
+              borderRadius: '50%',
+              background: 'radial-gradient(circle, #4a7c3a 0%, #3d6630 60%, transparent 70%)',
+              opacity: 0.12,
+              filter: 'blur(3px)',
+              animation: 'treeSway1 7s ease-in-out infinite',
+            }}
+          />
+
+          <div
+            style={{
+              position: 'absolute',
+              top: '55%',
+              right: '3%',
+              width: '70px',
+              height: '70px',
+              borderRadius: '50%',
+              background: 'radial-gradient(circle, #4a7c3a 0%, #3d6630 60%, transparent 70%)',
+              opacity: 0.14,
+              filter: 'blur(4px)',
+              animation: 'treeSway2 8.5s ease-in-out infinite reverse',
+            }}
+          />
+        </div>
+      )}
+
+      {/* Flying bird shadows - very subtle from aerial view */}
+      {state.style !== 'sprint' && (
+        <div
+          style={{
+            position: 'absolute',
+            inset: 0,
+            overflow: 'hidden',
+            pointerEvents: 'none',
+            zIndex: 0,
+          }}
+        >
+          <div
+            style={{
+              position: 'absolute',
+              top: '30%',
+              left: '-5%',
+              width: '15px',
+              height: '8px',
+              background: 'rgba(0, 0, 0, 0.08)',
+              borderRadius: '50%',
+              filter: 'blur(2px)',
+              animation: 'birdFly1 20s linear infinite',
+            }}
+          />
+
+          <div
+            style={{
+              position: 'absolute',
+              top: '60%',
+              left: '-5%',
+              width: '12px',
+              height: '6px',
+              background: 'rgba(0, 0, 0, 0.06)',
+              borderRadius: '50%',
+              filter: 'blur(2px)',
+              animation: 'birdFly2 28s linear infinite',
+            }}
+          />
+
+          <div
+            style={{
+              position: 'absolute',
+              top: '45%',
+              left: '-5%',
+              width: '10px',
+              height: '5px',
+              background: 'rgba(0, 0, 0, 0.05)',
+              borderRadius: '50%',
+              filter: 'blur(1px)',
+              animation: 'birdFly1 35s linear infinite',
+              animationDelay: '-12s',
+            }}
+          />
+        </div>
+      )}
+
+      {/* Subtle cloud shadows moving across field */}
+      {state.style !== 'sprint' && (
+        <div
+          style={{
+            position: 'absolute',
+            inset: 0,
+            overflow: 'hidden',
+            pointerEvents: 'none',
+            zIndex: 0,
+          }}
+        >
+          <div
+            style={{
+              position: 'absolute',
+              top: '-10%',
+              left: '-20%',
+              width: '300px',
+              height: '200px',
+              background: 'radial-gradient(ellipse, rgba(0, 0, 0, 0.03) 0%, transparent 60%)',
+              borderRadius: '50%',
+              filter: 'blur(20px)',
+              animation: 'cloudShadow1 45s linear infinite',
+            }}
+          />
+
+          <div
+            style={{
+              position: 'absolute',
+              top: '-10%',
+              left: '-20%',
+              width: '250px',
+              height: '180px',
+              background: 'radial-gradient(ellipse, rgba(0, 0, 0, 0.025) 0%, transparent 60%)',
+              borderRadius: '50%',
+              filter: 'blur(25px)',
+              animation: 'cloudShadow2 60s linear infinite',
+              animationDelay: '-20s',
+            }}
+          />
+        </div>
+      )}
+
+      {/* CSS animations */}
+      <style>{`
+        @keyframes treeSway1 {
+          0%, 100% { transform: scale(1) translate(0, 0); }
+          25% { transform: scale(1.02) translate(2px, -1px); }
+          50% { transform: scale(0.98) translate(-1px, 1px); }
+          75% { transform: scale(1.01) translate(-2px, -1px); }
+        }
+        @keyframes treeSway2 {
+          0%, 100% { transform: scale(1) translate(0, 0); }
+          30% { transform: scale(1.015) translate(-2px, 1px); }
+          60% { transform: scale(0.985) translate(2px, -1px); }
+          80% { transform: scale(1.01) translate(1px, 1px); }
+        }
+        @keyframes birdFly1 {
+          0% { transform: translate(0, 0); }
+          100% { transform: translate(calc(100vw + 100px), -20vh); }
+        }
+        @keyframes birdFly2 {
+          0% { transform: translate(0, 0); }
+          100% { transform: translate(calc(100vw + 100px), 15vh); }
+        }
+        @keyframes cloudShadow1 {
+          0% { transform: translate(0, 0); }
+          100% { transform: translate(calc(100vw + 400px), 30vh); }
+        }
+        @keyframes cloudShadow2 {
+          0% { transform: translate(0, 0); }
+          100% { transform: translate(calc(100vw + 350px), -20vh); }
+        }
+      `}</style>
+
+      <div
+        style={{
+          maxWidth: '100%',
+          margin: '0 auto',
+          flex: 1,
+          display: 'flex',
+          flexDirection: 'column',
+          position: 'relative',
+          zIndex: 1,
+        }}
+      >
+        {state.gamePhase === 'intro' && <GameIntro />}
+        {state.gamePhase === 'controls' && <GameControls />}
+        {state.gamePhase === 'countdown' && <GameCountdown />}
+        {state.gamePhase === 'playing' && <GameDisplay />}
+        {state.gamePhase === 'results' && <GameResults />}
+      </div>
+    </div>
+  )
+}
--- a/apps/web/src/app/arcade/complement-race/components/GameControls.tsx
+++ b/apps/web/src/app/arcade/complement-race/components/GameControls.tsx
@@ -0,0 +1,475 @@
+'use client'
+
+import { useComplementRace } from '../context/ComplementRaceContext'
+import type { ComplementDisplay, GameMode, GameStyle, TimeoutSetting } from '../lib/gameTypes'
+import { AbacusTarget } from './AbacusTarget'
+
+export function GameControls() {
+  const { state, dispatch } = useComplementRace()
+
+  const handleModeSelect = (mode: GameMode) => {
+    dispatch({ type: 'SET_MODE', mode })
+  }
+
+  const handleStyleSelect = (style: GameStyle) => {
+    dispatch({ type: 'SET_STYLE', style })
+    // Start the game immediately - no navigation needed
+    if (style === 'sprint') {
+      dispatch({ type: 'BEGIN_GAME' })
+    } else {
+      dispatch({ type: 'START_COUNTDOWN' })
+    }
+  }
+
+  const handleTimeoutSelect = (timeout: TimeoutSetting) => {
+    dispatch({ type: 'SET_TIMEOUT', timeout })
+  }
+
+  return (
+    <div
+      style={{
+        height: '100vh',
+        display: 'flex',
+        flexDirection: 'column',
+        background: 'linear-gradient(to bottom, #0f172a 0%, #1e293b 50%, #334155 100%)',
+        overflow: 'hidden',
+        position: 'relative',
+      }}
+    >
+      {/* Animated background pattern */}
+      <div
+        style={{
+          position: 'absolute',
+          top: 0,
+          left: 0,
+          right: 0,
+          bottom: 0,
+          backgroundImage:
+            'radial-gradient(circle at 20% 50%, rgba(59, 130, 246, 0.1) 0%, transparent 50%), radial-gradient(circle at 80% 80%, rgba(139, 92, 246, 0.1) 0%, transparent 50%)',
+          pointerEvents: 'none',
+        }}
+      />
+
+      {/* Header */}
+      <div
+        style={{
+          textAlign: 'center',
+          padding: '20px',
+          position: 'relative',
+          zIndex: 1,
+        }}
+      >
+        <h1
+          style={{
+            fontSize: '32px',
+            fontWeight: 'bold',
+            background: 'linear-gradient(135deg, #60a5fa 0%, #a78bfa 100%)',
+            WebkitBackgroundClip: 'text',
+            WebkitTextFillColor: 'transparent',
+            backgroundClip: 'text',
+            margin: 0,
+            letterSpacing: '-0.5px',
+          }}
+        >
+          Complement Race
+        </h1>
+      </div>
+
+      {/* Settings Bar */}
+      <div
+        style={{
+          padding: '0 20px 16px',
+          display: 'flex',
+          flexDirection: 'column',
+          gap: '12px',
+          position: 'relative',
+          zIndex: 1,
+        }}
+      >
+        {/* Number Mode & Display */}
+        <div
+          style={{
+            background: 'rgba(30, 41, 59, 0.8)',
+            backdropFilter: 'blur(20px)',
+            borderRadius: '16px',
+            padding: '16px',
+            border: '1px solid rgba(148, 163, 184, 0.2)',
+          }}
+        >
+          <div
+            style={{
+              display: 'flex',
+              gap: '20px',
+              flexWrap: 'wrap',
+              alignItems: 'center',
+            }}
+          >
+            {/* Number Mode Pills */}
+            <div
+              style={{
+                display: 'flex',
+                gap: '8px',
+                alignItems: 'center',
+                flex: 1,
+                minWidth: '200px',
+              }}
+            >
+              <span
+                style={{
+                  fontSize: '13px',
+                  color: '#94a3b8',
+                  fontWeight: '600',
+                  marginRight: '4px',
+                }}
+              >
+                Mode:
+              </span>
+              {[
+                { mode: 'friends5' as GameMode, label: '5' },
+                { mode: 'friends10' as GameMode, label: '10' },
+                { mode: 'mixed' as GameMode, label: 'Mix' },
+              ].map(({ mode, label }) => (
+                <button
+                  key={mode}
+                  onClick={() => handleModeSelect(mode)}
+                  style={{
+                    padding: '8px 16px',
+                    borderRadius: '20px',
+                    border: 'none',
+                    background:
+                      state.mode === mode
+                        ? 'linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%)'
+                        : 'rgba(148, 163, 184, 0.2)',
+                    color: state.mode === mode ? 'white' : '#94a3b8',
+                    fontWeight: 'bold',
+                    cursor: 'pointer',
+                    transition: 'all 0.2s ease',
+                    fontSize: '13px',
+                  }}
+                >
+                  {label}
+                </button>
+              ))}
+            </div>
+
+            {/* Complement Display Pills */}
+            <div
+              style={{
+                display: 'flex',
+                gap: '8px',
+                alignItems: 'center',
+                flex: 1,
+                minWidth: '200px',
+              }}
+            >
+              <span
+                style={{
+                  fontSize: '13px',
+                  color: '#94a3b8',
+                  fontWeight: '600',
+                  marginRight: '4px',
+                }}
+              >
+                Show:
+              </span>
+              {(['number', 'abacus', 'random'] as ComplementDisplay[]).map((displayMode) => (
+                <button
+                  key={displayMode}
+                  onClick={() => dispatch({ type: 'SET_COMPLEMENT_DISPLAY', display: displayMode })}
+                  style={{
+                    padding: '8px 16px',
+                    borderRadius: '20px',
+                    border: 'none',
+                    background:
+                      state.complementDisplay === displayMode
+                        ? 'linear-gradient(135deg, #10b981 0%, #059669 100%)'
+                        : 'rgba(148, 163, 184, 0.2)',
+                    color: state.complementDisplay === displayMode ? 'white' : '#94a3b8',
+                    fontWeight: 'bold',
+                    cursor: 'pointer',
+                    transition: 'all 0.2s ease',
+                    fontSize: '13px',
+                  }}
+                >
+                  {displayMode === 'number' ? '123' : displayMode === 'abacus' ? '🧮' : '🎲'}
+                </button>
+              ))}
+            </div>
+
+            {/* Speed Pills */}
+            <div
+              style={{
+                display: 'flex',
+                gap: '6px',
+                alignItems: 'center',
+                flex: 1,
+                minWidth: '200px',
+                flexWrap: 'wrap',
+              }}
+            >
+              <span
+                style={{
+                  fontSize: '13px',
+                  color: '#94a3b8',
+                  fontWeight: '600',
+                  marginRight: '4px',
+                }}
+              >
+                Speed:
+              </span>
+              {(
+                [
+                  'preschool',
+                  'kindergarten',
+                  'relaxed',
+                  'slow',
+                  'normal',
+                  'fast',
+                  'expert',
+                ] as TimeoutSetting[]
+              ).map((timeout) => (
+                <button
+                  key={timeout}
+                  onClick={() => handleTimeoutSelect(timeout)}
+                  style={{
+                    padding: '6px 12px',
+                    borderRadius: '16px',
+                    border: 'none',
+                    background:
+                      state.timeoutSetting === timeout
+                        ? 'linear-gradient(135deg, #ec4899 0%, #be185d 100%)'
+                        : 'rgba(148, 163, 184, 0.2)',
+                    color: state.timeoutSetting === timeout ? 'white' : '#94a3b8',
+                    fontWeight: state.timeoutSetting === timeout ? 'bold' : 'normal',
+                    cursor: 'pointer',
+                    transition: 'all 0.2s ease',
+                    fontSize: '11px',
+                  }}
+                >
+                  {timeout === 'preschool'
+                    ? 'Pre'
+                    : timeout === 'kindergarten'
+                      ? 'K'
+                      : timeout.charAt(0).toUpperCase()}
+                </button>
+              ))}
+            </div>
+          </div>
+
+          {/* Preview - compact */}
+          <div
+            style={{
+              marginTop: '12px',
+              padding: '12px',
+              borderRadius: '12px',
+              background: 'rgba(15, 23, 42, 0.6)',
+              border: '1px solid rgba(148, 163, 184, 0.2)',
+              display: 'flex',
+              alignItems: 'center',
+              justifyContent: 'center',
+              gap: '12px',
+            }}
+          >
+            <span style={{ fontSize: '11px', color: '#94a3b8', fontWeight: '600' }}>Preview:</span>
+            <div
+              style={{
+                display: 'flex',
+                alignItems: 'center',
+                gap: '10px',
+                fontSize: '20px',
+                fontWeight: 'bold',
+                color: 'white',
+              }}
+            >
+              <div
+                style={{
+                  background: 'linear-gradient(135deg, #3b82f6, #8b5cf6)',
+                  color: 'white',
+                  padding: '2px 10px',
+                  borderRadius: '6px',
+                }}
+              >
+                ?
+              </div>
+              <span style={{ fontSize: '16px', color: '#64748b' }}>+</span>
+              {state.complementDisplay === 'number' ? (
+                <span>3</span>
+              ) : state.complementDisplay === 'abacus' ? (
+                <div style={{ transform: 'scale(0.8)' }}>
+                  <AbacusTarget number={3} />
+                </div>
+              ) : (
+                <span style={{ fontSize: '14px' }}>🎲</span>
+              )}
+              <span style={{ fontSize: '16px', color: '#64748b' }}>=</span>
+              <span style={{ color: '#10b981' }}>
+                {state.mode === 'friends5' ? '5' : state.mode === 'friends10' ? '10' : '?'}
+              </span>
+            </div>
+          </div>
+        </div>
+      </div>
+
+      {/* HERO SECTION - Race Cards */}
+      <div
+        data-component="race-cards-container"
+        style={{
+          flex: 1,
+          padding: '0 20px 20px',
+          display: 'flex',
+          flexDirection: 'column',
+          gap: '16px',
+          position: 'relative',
+          zIndex: 1,
+          overflow: 'auto',
+        }}
+      >
+        {[
+          {
+            style: 'practice' as GameStyle,
+            emoji: '🏁',
+            title: 'Practice Race',
+            desc: 'Race against AI to 20 correct answers',
+            gradient: 'linear-gradient(135deg, #10b981 0%, #059669 100%)',
+            shadowColor: 'rgba(16, 185, 129, 0.5)',
+            accentColor: '#34d399',
+          },
+          {
+            style: 'sprint' as GameStyle,
+            emoji: '🚂',
+            title: 'Steam Sprint',
+            desc: 'High-speed 60-second train journey',
+            gradient: 'linear-gradient(135deg, #f59e0b 0%, #d97706 100%)',
+            shadowColor: 'rgba(245, 158, 11, 0.5)',
+            accentColor: '#fbbf24',
+          },
+          {
+            style: 'survival' as GameStyle,
+            emoji: '🔄',
+            title: 'Survival Circuit',
+            desc: 'Endless laps - beat your best time',
+            gradient: 'linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%)',
+            shadowColor: 'rgba(139, 92, 246, 0.5)',
+            accentColor: '#a78bfa',
+          },
+        ].map(({ style, emoji, title, desc, gradient, shadowColor, accentColor }) => (
+          <button
+            key={style}
+            onClick={() => handleStyleSelect(style)}
+            style={{
+              position: 'relative',
+              padding: '0',
+              border: 'none',
+              borderRadius: '24px',
+              background: gradient,
+              cursor: 'pointer',
+              transition: 'all 0.3s cubic-bezier(0.4, 0, 0.2, 1)',
+              boxShadow: `0 10px 40px ${shadowColor}, 0 0 0 1px rgba(255, 255, 255, 0.1)`,
+              transform: 'translateY(0)',
+              flex: 1,
+              minHeight: '140px',
+              overflow: 'hidden',
+            }}
+            onMouseEnter={(e) => {
+              e.currentTarget.style.transform = 'translateY(-8px) scale(1.02)'
+              e.currentTarget.style.boxShadow = `0 20px 60px ${shadowColor}, 0 0 0 2px ${accentColor}`
+            }}
+            onMouseLeave={(e) => {
+              e.currentTarget.style.transform = 'translateY(0) scale(1)'
+              e.currentTarget.style.boxShadow = `0 10px 40px ${shadowColor}, 0 0 0 1px rgba(255, 255, 255, 0.1)`
+            }}
+          >
+            {/* Shine effect overlay */}
+            <div
+              style={{
+                position: 'absolute',
+                top: 0,
+                left: 0,
+                right: 0,
+                bottom: 0,
+                background: 'linear-gradient(135deg, rgba(255,255,255,0.2) 0%, transparent 50%)',
+                pointerEvents: 'none',
+              }}
+            />
+
+            <div
+              style={{
+                padding: '28px 32px',
+                display: 'flex',
+                alignItems: 'center',
+                justifyContent: 'space-between',
+                position: 'relative',
+                zIndex: 1,
+              }}
+            >
+              <div
+                style={{
+                  display: 'flex',
+                  alignItems: 'center',
+                  gap: '20px',
+                  flex: 1,
+                }}
+              >
+                <div
+                  style={{
+                    fontSize: '64px',
+                    lineHeight: 1,
+                    filter: 'drop-shadow(0 4px 8px rgba(0,0,0,0.3))',
+                  }}
+                >
+                  {emoji}
+                </div>
+                <div style={{ textAlign: 'left', flex: 1 }}>
+                  <div
+                    style={{
+                      fontSize: '28px',
+                      fontWeight: 'bold',
+                      color: 'white',
+                      marginBottom: '6px',
+                      textShadow: '0 2px 8px rgba(0,0,0,0.3)',
+                    }}
+                  >
+                    {title}
+                  </div>
+                  <div
+                    style={{
+                      fontSize: '15px',
+                      color: 'rgba(255, 255, 255, 0.9)',
+                      textShadow: '0 1px 4px rgba(0,0,0,0.2)',
+                    }}
+                  >
+                    {desc}
+                  </div>
+                </div>
+              </div>
+
+              {/* PLAY NOW button */}
+              <div
+                style={{
+                  background: 'white',
+                  color: gradient.includes('10b981')
+                    ? '#047857'
+                    : gradient.includes('f59e0b')
+                      ? '#d97706'
+                      : '#6b21a8',
+                  padding: '16px 32px',
+                  borderRadius: '16px',
+                  fontWeight: 'bold',
+                  fontSize: '18px',
+                  boxShadow: '0 8px 24px rgba(0,0,0,0.25)',
+                  display: 'flex',
+                  alignItems: 'center',
+                  gap: '10px',
+                  whiteSpace: 'nowrap',
+                }}
+              >
+                <span>PLAY</span>
+                <span style={{ fontSize: '24px' }}>▶</span>
+              </div>
+            </div>
+          </button>
+        ))}
+      </div>
+    </div>
+  )
+}
--- a/apps/web/src/app/arcade/complement-race/components/GameCountdown.tsx
+++ b/apps/web/src/app/arcade/complement-race/components/GameCountdown.tsx
@@ -0,0 +1,104 @@
+'use client'
+
+import { useEffect, useState } from 'react'
+import { useComplementRace } from '../context/ComplementRaceContext'
+import { useSoundEffects } from '../hooks/useSoundEffects'
+
+export function GameCountdown() {
+  const { dispatch } = useComplementRace()
+  const { playSound } = useSoundEffects()
+  const [count, setCount] = useState(3)
+  const [showGo, setShowGo] = useState(false)
+
+  useEffect(() => {
+    const countdownInterval = setInterval(() => {
+      setCount((prevCount) => {
+        if (prevCount > 1) {
+          // Play countdown beep (volume 0.4)
+          playSound('countdown', 0.4)
+          return prevCount - 1
+        } else if (prevCount === 1) {
+          // Show GO!
+          setShowGo(true)
+          // Play race start fanfare (volume 0.6)
+          playSound('race_start', 0.6)
+          return 0
+        }
+        return prevCount
+      })
+    }, 1000)
+
+    return () => clearInterval(countdownInterval)
+  }, [playSound])
+
+  useEffect(() => {
+    if (showGo) {
+      // Hide countdown and start game after GO animation
+      const timer = setTimeout(() => {
+        dispatch({ type: 'BEGIN_GAME' })
+      }, 1000)
+
+      return () => clearTimeout(timer)
+    }
+  }, [showGo, dispatch])
+
+  return (
+    <div
+      style={{
+        position: 'fixed',
+        top: 0,
+        left: 0,
+        right: 0,
+        bottom: 0,
+        display: 'flex',
+        flexDirection: 'column',
+        alignItems: 'center',
+        justifyContent: 'center',
+        background: 'rgba(0, 0, 0, 0.9)',
+        zIndex: 1000,
+      }}
+    >
+      <div
+        style={{
+          fontSize: showGo ? '120px' : '160px',
+          fontWeight: 'bold',
+          color: showGo ? '#10b981' : 'white',
+          textShadow: '0 4px 20px rgba(0, 0, 0, 0.5)',
+          animation: showGo ? 'scaleUp 1s ease-out' : 'pulse 0.5s ease-in-out',
+          transition: 'all 0.3s ease',
+        }}
+      >
+        {showGo ? 'GO!' : count}
+      </div>
+
+      {!showGo && (
+        <div
+          style={{
+            marginTop: '32px',
+            fontSize: '24px',
+            color: 'rgba(255, 255, 255, 0.8)',
+            fontWeight: '500',
+          }}
+        >
+          Get Ready!
+        </div>
+      )}
+
+      <style
+        dangerouslySetInnerHTML={{
+          __html: `
+          @keyframes pulse {
+            0%, 100% { transform: scale(1); opacity: 1; }
+            50% { transform: scale(1.1); opacity: 0.8; }
+          }
+          @keyframes scaleUp {
+            0% { transform: scale(0.5); opacity: 0; }
+            50% { transform: scale(1.2); opacity: 1; }
+            100% { transform: scale(1); opacity: 1; }
+          }
+        `,
+        }}
+      />
+    </div>
+  )
+}
--- a/apps/web/src/app/arcade/complement-race/components/GameDisplay.tsx
+++ b/apps/web/src/app/arcade/complement-race/components/GameDisplay.tsx
@@ -0,0 +1,409 @@
+'use client'
+
+import { useEffect, useState } from 'react'
+import { useComplementRace } from '../context/ComplementRaceContext'
+import { useAdaptiveDifficulty } from '../hooks/useAdaptiveDifficulty'
+import { useAIRacers } from '../hooks/useAIRacers'
+import { useSoundEffects } from '../hooks/useSoundEffects'
+import { useSteamJourney } from '../hooks/useSteamJourney'
+import { generatePassengers } from '../lib/passengerGenerator'
+import { AbacusTarget } from './AbacusTarget'
+import { CircularTrack } from './RaceTrack/CircularTrack'
+import { LinearTrack } from './RaceTrack/LinearTrack'
+import { SteamTrainJourney } from './RaceTrack/SteamTrainJourney'
+import { RouteCelebration } from './RouteCelebration'
+
+type FeedbackAnimation = 'correct' | 'incorrect' | null
+
+export function GameDisplay() {
+  const { state, dispatch } = useComplementRace()
+  useAIRacers() // Activate AI racer updates (not used in sprint mode)
+  const { trackPerformance, getAdaptiveFeedbackMessage } = useAdaptiveDifficulty()
+  const { boostMomentum } = useSteamJourney()
+  const { playSound } = useSoundEffects()
+  const [feedbackAnimation, setFeedbackAnimation] = useState<FeedbackAnimation>(null)
+
+  // Clear feedback animation after it plays (line 1996, 2001)
+  useEffect(() => {
+    if (feedbackAnimation) {
+      const timer = setTimeout(() => {
+        setFeedbackAnimation(null)
+      }, 500) // Match animation duration
+      return () => clearTimeout(timer)
+    }
+  }, [feedbackAnimation])
+
+  // Show adaptive feedback with auto-hide
+  useEffect(() => {
+    if (state.adaptiveFeedback) {
+      const timer = setTimeout(() => {
+        dispatch({ type: 'CLEAR_ADAPTIVE_FEEDBACK' })
+      }, 3000)
+      return () => clearTimeout(timer)
+    }
+  }, [state.adaptiveFeedback, dispatch])
+
+  // Check for finish line (player reaches race goal) - only for practice mode
+  useEffect(() => {
+    if (
+      state.correctAnswers >= state.raceGoal &&
+      state.isGameActive &&
+      state.style === 'practice'
+    ) {
+      // Play celebration sound (line 14182)
+      playSound('celebration')
+      // End the game
+      dispatch({ type: 'END_RACE' })
+      // Show results after a short delay
+      setTimeout(() => {
+        dispatch({ type: 'SHOW_RESULTS' })
+      }, 1500)
+    }
+  }, [state.correctAnswers, state.raceGoal, state.isGameActive, state.style, dispatch, playSound])
+
+  // For survival mode (endless circuit), track laps but never end
+  // For sprint mode (steam sprint), end after 60 seconds (will implement later)
+
+  // Handle keyboard input
+  useEffect(() => {
+    const handleKeyPress = (e: KeyboardEvent) => {
+      // Only process number keys
+      if (/^[0-9]$/.test(e.key)) {
+        const newInput = state.currentInput + e.key
+        dispatch({ type: 'UPDATE_INPUT', input: newInput })
+
+        // Check if answer is complete
+        if (state.currentQuestion) {
+          const answer = parseInt(newInput, 10)
+          const correctAnswer = state.currentQuestion.correctAnswer
+
+          // If we have enough digits to match the answer, submit
+          if (newInput.length >= correctAnswer.toString().length) {
+            const responseTime = Date.now() - state.questionStartTime
+            const isCorrect = answer === correctAnswer
+            const pairKey = `${state.currentQuestion.number}_${state.currentQuestion.correctAnswer}_${state.currentQuestion.targetSum}`
+
+            if (isCorrect) {
+              // Correct answer
+              dispatch({ type: 'SUBMIT_ANSWER', answer })
+              trackPerformance(true, responseTime)
+
+              // Trigger correct answer animation (line 1996)
+              setFeedbackAnimation('correct')
+
+              // Play appropriate sound based on performance (from web_generator.py lines 11530-11542)
+              const newStreak = state.streak + 1
+              if (newStreak > 0 && newStreak % 5 === 0) {
+                // Epic streak sound for every 5th correct answer
+                playSound('streak')
+              } else if (responseTime < 800) {
+                // Whoosh sound for very fast responses (under 800ms)
+                playSound('whoosh')
+              } else if (responseTime < 1200 && state.streak >= 3) {
+                // Combo sound for rapid answers while on a streak
+                playSound('combo')
+              } else {
+                // Regular correct sound
+                playSound('correct')
+              }
+
+              // Boost momentum for sprint mode
+              if (state.style === 'sprint') {
+                boostMomentum()
+
+                // Play train whistle for milestones in sprint mode (line 13222-13235)
+                if (newStreak >= 5 && newStreak % 3 === 0) {
+                  // Major milestone - play train whistle
+                  setTimeout(() => {
+                    playSound('train_whistle', 0.4)
+                  }, 200)
+                } else if (state.momentum >= 90) {
+                  // High momentum celebration - occasional whistle
+                  if (Math.random() < 0.3) {
+                    setTimeout(() => {
+                      playSound('train_whistle', 0.25)
+                    }, 150)
+                  }
+                }
+              }
+
+              // Show adaptive feedback
+              const feedback = getAdaptiveFeedbackMessage(pairKey, true, responseTime)
+              if (feedback) {
+                dispatch({ type: 'SHOW_ADAPTIVE_FEEDBACK', feedback })
+              }
+
+              dispatch({ type: 'NEXT_QUESTION' })
+            } else {
+              // Incorrect answer
+              trackPerformance(false, responseTime)
+
+              // Trigger incorrect answer animation (line 2001)
+              setFeedbackAnimation('incorrect')
+
+              // Play incorrect sound (from web_generator.py line 11589)
+              playSound('incorrect')
+
+              // Show adaptive feedback
+              const feedback = getAdaptiveFeedbackMessage(pairKey, false, responseTime)
+              if (feedback) {
+                dispatch({ type: 'SHOW_ADAPTIVE_FEEDBACK', feedback })
+              }
+
+              dispatch({ type: 'UPDATE_INPUT', input: '' })
+            }
+          }
+        }
+      } else if (e.key === 'Backspace') {
+        dispatch({ type: 'UPDATE_INPUT', input: state.currentInput.slice(0, -1) })
+      }
+    }
+
+    window.addEventListener('keydown', handleKeyPress)
+    return () => window.removeEventListener('keydown', handleKeyPress)
+  }, [
+    state.currentInput,
+    state.currentQuestion,
+    state.questionStartTime,
+    state.style,
+    state.streak,
+    dispatch,
+    trackPerformance,
+    getAdaptiveFeedbackMessage,
+    boostMomentum,
+    playSound,
+    state.momentum,
+  ])
+
+  // Handle route celebration continue
+  const handleContinueToNextRoute = () => {
+    const nextRoute = state.currentRoute + 1
+
+    // Start new route (this also hides celebration)
+    dispatch({
+      type: 'START_NEW_ROUTE',
+      routeNumber: nextRoute,
+      stations: state.stations, // Keep same stations for now
+    })
+
+    // Generate new passengers
+    const newPassengers = generatePassengers(state.stations)
+    dispatch({ type: 'GENERATE_PASSENGERS', passengers: newPassengers })
+  }
+
+  if (!state.currentQuestion) return null
+
+  return (
+    <div
+      data-component="game-display"
+      style={{
+        flex: 1,
+        display: 'flex',
+        flexDirection: 'column',
+        width: '100%',
+      }}
+    >
+      {/* Adaptive Feedback */}
+      {state.adaptiveFeedback && (
+        <div
+          data-component="adaptive-feedback"
+          style={{
+            position: 'fixed',
+            top: '80px',
+            left: '50%',
+            transform: 'translateX(-50%)',
+            background: 'linear-gradient(135deg, #667eea 0%, #764ba2 100%)',
+            color: 'white',
+            padding: '12px 24px',
+            borderRadius: '12px',
+            boxShadow: '0 4px 20px rgba(102, 126, 234, 0.4)',
+            fontSize: '16px',
+            fontWeight: 'bold',
+            zIndex: 1000,
+            animation: 'slideDown 0.3s ease-out',
+            maxWidth: '600px',
+            textAlign: 'center',
+          }}
+        >
+          {state.adaptiveFeedback.message}
+        </div>
+      )}
+
+      {/* Stats Header - constrained width, hidden for sprint mode */}
+      {state.style !== 'sprint' && (
+        <div
+          data-component="stats-container"
+          style={{
+            maxWidth: '1200px',
+            margin: '0 auto',
+            width: '100%',
+            padding: '0 20px',
+            marginTop: '10px',
+          }}
+        >
+          <div
+            data-component="stats-header"
+            style={{
+              display: 'flex',
+              justifyContent: 'space-around',
+              marginBottom: '10px',
+              background: 'white',
+              borderRadius: '12px',
+              padding: '10px',
+              boxShadow: '0 2px 8px rgba(0, 0, 0, 0.1)',
+            }}
+          >
+            <div data-stat="score" style={{ textAlign: 'center' }}>
+              <div style={{ color: '#6b7280', fontSize: '14px', marginBottom: '4px' }}>Score</div>
+              <div style={{ fontWeight: 'bold', fontSize: '24px', color: '#3b82f6' }}>
+                {state.score}
+              </div>
+            </div>
+            <div data-stat="streak" style={{ textAlign: 'center' }}>
+              <div style={{ color: '#6b7280', fontSize: '14px', marginBottom: '4px' }}>Streak</div>
+              <div style={{ fontWeight: 'bold', fontSize: '24px', color: '#10b981' }}>
+                {state.streak} 🔥
+              </div>
+            </div>
+            <div data-stat="progress" style={{ textAlign: 'center' }}>
+              <div style={{ color: '#6b7280', fontSize: '14px', marginBottom: '4px' }}>
+                Progress
+              </div>
+              <div style={{ fontWeight: 'bold', fontSize: '24px', color: '#f59e0b' }}>
+                {state.correctAnswers}/{state.raceGoal}
+              </div>
+            </div>
+          </div>
+        </div>
+      )}
+
+      {/* Race Track - full width, break out of padding */}
+      <div
+        data-component="track-container"
+        style={{
+          width: '100vw',
+          position: 'relative',
+          left: '50%',
+          right: '50%',
+          marginLeft: '-50vw',
+          marginRight: '-50vw',
+          padding: state.style === 'sprint' ? '0' : '0 20px',
+          display: 'flex',
+          justifyContent: state.style === 'sprint' ? 'stretch' : 'center',
+          background: 'transparent',
+          flex: state.style === 'sprint' ? 1 : 'initial',
+          minHeight: state.style === 'sprint' ? 0 : 'initial',
+        }}
+      >
+        {state.style === 'survival' ? (
+          <CircularTrack
+            playerProgress={state.correctAnswers}
+            playerLap={state.playerLap}
+            aiRacers={state.aiRacers}
+            aiLaps={state.aiLaps}
+          />
+        ) : state.style === 'sprint' ? (
+          <SteamTrainJourney
+            momentum={state.momentum}
+            trainPosition={state.trainPosition}
+            pressure={state.pressure}
+            elapsedTime={state.elapsedTime}
+            currentQuestion={state.currentQuestion}
+            currentInput={state.currentInput}
+          />
+        ) : (
+          <LinearTrack
+            playerProgress={state.correctAnswers}
+            aiRacers={state.aiRacers}
+            raceGoal={state.raceGoal}
+            showFinishLine={true}
+          />
+        )}
+      </div>
+
+      {/* Question Display - only for non-sprint modes */}
+      {state.style !== 'sprint' && (
+        <div
+          data-component="question-container"
+          style={{
+            maxWidth: '1200px',
+            margin: '0 auto',
+            width: '100%',
+            padding: '0 20px',
+            display: 'flex',
+            justifyContent: 'center',
+            marginTop: '20px',
+          }}
+        >
+          <div
+            data-component="question-display"
+            style={{
+              background: 'rgba(255, 255, 255, 0.98)',
+              borderRadius: '24px',
+              padding: '28px 50px',
+              boxShadow: '0 16px 40px rgba(0, 0, 0, 0.3), 0 0 0 5px rgba(59, 130, 246, 0.4)',
+              backdropFilter: 'blur(12px)',
+              border: '4px solid rgba(255, 255, 255, 0.95)',
+            }}
+          >
+            {/* Complement equation as main focus */}
+            <div
+              data-element="question-equation"
+              style={{
+                fontSize: '96px',
+                fontWeight: 'bold',
+                color: '#1f2937',
+                lineHeight: '1.1',
+                display: 'flex',
+                alignItems: 'center',
+                gap: '20px',
+                justifyContent: 'center',
+              }}
+            >
+              <span
+                style={{
+                  background: 'linear-gradient(135deg, #3b82f6, #8b5cf6)',
+                  color: 'white',
+                  padding: '12px 32px',
+                  borderRadius: '16px',
+                  minWidth: '140px',
+                  display: 'inline-block',
+                  textShadow: '0 3px 10px rgba(0, 0, 0, 0.3)',
+                }}
+              >
+                {state.currentInput || '?'}
+              </span>
+              <span style={{ color: '#6b7280' }}>+</span>
+              {state.currentQuestion.showAsAbacus ? (
+                <div
+                  style={{
+                    transform: 'scale(2.4) translateY(8%)',
+                    transformOrigin: 'center center',
+                    display: 'flex',
+                    alignItems: 'center',
+                    justifyContent: 'center',
+                  }}
+                >
+                  <AbacusTarget number={state.currentQuestion.number} />
+                </div>
+              ) : (
+                <span>{state.currentQuestion.number}</span>
+              )}
+              <span style={{ color: '#6b7280' }}>=</span>
+              <span style={{ color: '#10b981' }}>{state.currentQuestion.targetSum}</span>
+            </div>
+          </div>
+        </div>
+      )}
+
+      {/* Route Celebration Modal */}
+      {state.showRouteCelebration && state.style === 'sprint' && (
+        <RouteCelebration
+          completedRouteNumber={state.currentRoute}
+          nextRouteNumber={state.currentRoute + 1}
+          onContinue={handleContinueToNextRoute}
+        />
+      )}
+    </div>
+  )
+}
--- a/apps/web/src/app/arcade/complement-race/components/GameIntro.tsx
+++ b/apps/web/src/app/arcade/complement-race/components/GameIntro.tsx
@@ -0,0 +1,132 @@
+'use client'
+
+import { useComplementRace } from '../context/ComplementRaceContext'
+
+export function GameIntro() {
+  const { dispatch } = useComplementRace()
+
+  const handleStartClick = () => {
+    dispatch({ type: 'SHOW_CONTROLS' })
+  }
+
+  return (
+    <div
+      style={{
+        textAlign: 'center',
+        padding: '40px 20px',
+        maxWidth: '800px',
+        margin: '20px auto 0',
+      }}
+    >
+      <h1
+        style={{
+          fontSize: '48px',
+          fontWeight: 'bold',
+          marginBottom: '16px',
+          background: 'linear-gradient(135deg, #3b82f6, #8b5cf6)',
+          WebkitBackgroundClip: 'text',
+          WebkitTextFillColor: 'transparent',
+          backgroundClip: 'text',
+        }}
+      >
+        Speed Complement Race
+      </h1>
+
+      <p
+        style={{
+          fontSize: '18px',
+          color: '#6b7280',
+          marginBottom: '32px',
+          lineHeight: '1.6',
+        }}
+      >
+        Race against AI opponents while solving complement problems! Find the missing number to
+        complete the equation.
+      </p>
+
+      <div
+        style={{
+          background: 'white',
+          borderRadius: '16px',
+          padding: '32px',
+          marginBottom: '32px',
+          boxShadow: '0 4px 12px rgba(0, 0, 0, 0.1)',
+          textAlign: 'left',
+        }}
+      >
+        <h2
+          style={{
+            fontSize: '24px',
+            fontWeight: 'bold',
+            marginBottom: '16px',
+            color: '#1f2937',
+          }}
+        >
+          How to Play
+        </h2>
+
+        <ul
+          style={{
+            listStyle: 'none',
+            padding: 0,
+            margin: 0,
+            display: 'flex',
+            flexDirection: 'column',
+            gap: '12px',
+          }}
+        >
+          <li style={{ display: 'flex', gap: '12px', alignItems: 'start' }}>
+            <span style={{ fontSize: '24px' }}>🎯</span>
+            <span style={{ color: '#4b5563', lineHeight: '1.6' }}>
+              Find the complement number to reach the target sum
+            </span>
+          </li>
+          <li style={{ display: 'flex', gap: '12px', alignItems: 'start' }}>
+            <span style={{ fontSize: '24px' }}>⚡</span>
+            <span style={{ color: '#4b5563', lineHeight: '1.6' }}>
+              Type your answer quickly to move forward in the race
+            </span>
+          </li>
+          <li style={{ display: 'flex', gap: '12px', alignItems: 'start' }}>
+            <span style={{ fontSize: '24px' }}>🤖</span>
+            <span style={{ color: '#4b5563', lineHeight: '1.6' }}>
+              Compete against Swift AI and Math Bot with unique personalities
+            </span>
+          </li>
+          <li style={{ display: 'flex', gap: '12px', alignItems: 'start' }}>
+            <span style={{ fontSize: '24px' }}>🏆</span>
+            <span style={{ color: '#4b5563', lineHeight: '1.6' }}>
+              Earn points for correct answers and build up your streak
+            </span>
+          </li>
+        </ul>
+      </div>
+
+      <button
+        onClick={handleStartClick}
+        style={{
+          background: 'linear-gradient(135deg, #10b981, #059669)',
+          color: 'white',
+          border: 'none',
+          borderRadius: '12px',
+          padding: '16px 48px',
+          fontSize: '20px',
+          fontWeight: 'bold',
+          cursor: 'pointer',
+          boxShadow: '0 4px 12px rgba(16, 185, 129, 0.3)',
+          transition: 'all 0.2s ease',
+        }}
+        onMouseEnter={(e) => {
+          e.currentTarget.style.transform = 'translateY(-2px)'
+          e.currentTarget.style.boxShadow = '0 6px 16px rgba(16, 185, 129, 0.4)'
+        }}
+        onMouseLeave={(e) => {
+          e.currentTarget.style.transform = 'translateY(0)'
+          e.currentTarget.style.boxShadow = '0 4px 12px rgba(16, 185, 129, 0.3)'
+        }}
+      >
+        Start Racing!
+      </button>
+    </div>
+  )
+}
--- a/apps/web/src/app/arcade/complement-race/components/GameResults.tsx
+++ b/apps/web/src/app/arcade/complement-race/components/GameResults.tsx
@@ -0,0 +1,245 @@
+'use client'
+
+import { useComplementRace } from '../context/ComplementRaceContext'
+
+export function GameResults() {
+  const { state, dispatch } = useComplementRace()
+
+  // Determine race outcome
+  const playerWon = state.aiRacers.every((racer) => state.correctAnswers > racer.position)
+  const playerPosition =
+    state.aiRacers.filter((racer) => racer.position >= state.correctAnswers).length + 1
+
+  return (
+    <div
+      style={{
+        flex: 1,
+        display: 'flex',
+        flexDirection: 'column',
+        alignItems: 'center',
+        justifyContent: 'center',
+        padding: '60px 40px 40px',
+        background: 'linear-gradient(135deg, #667eea 0%, #764ba2 100%)',
+        minHeight: '100vh',
+      }}
+    >
+      <div
+        style={{
+          background: 'white',
+          borderRadius: '24px',
+          padding: '48px',
+          maxWidth: '600px',
+          width: '100%',
+          boxShadow: '0 20px 60px rgba(0, 0, 0, 0.3)',
+          textAlign: 'center',
+        }}
+      >
+        {/* Result Header */}
+        <div
+          style={{
+            fontSize: '64px',
+            marginBottom: '16px',
+          }}
+        >
+          {playerWon ? '🏆' : playerPosition === 2 ? '🥈' : playerPosition === 3 ? '🥉' : '🎯'}
+        </div>
+
+        <h1
+          style={{
+            fontSize: '36px',
+            fontWeight: 'bold',
+            color: '#1f2937',
+            marginBottom: '8px',
+          }}
+        >
+          {playerWon ? 'Victory!' : `${playerPosition}${getOrdinalSuffix(playerPosition)} Place`}
+        </h1>
+
+        <p
+          style={{
+            fontSize: '18px',
+            color: '#6b7280',
+            marginBottom: '32px',
+          }}
+        >
+          {playerWon ? 'You beat all the AI racers!' : `You finished the race!`}
+        </p>
+
+        {/* Stats */}
+        <div
+          style={{
+            display: 'grid',
+            gridTemplateColumns: 'repeat(2, 1fr)',
+            gap: '16px',
+            marginBottom: '32px',
+          }}
+        >
+          <div
+            style={{
+              background: '#f3f4f6',
+              borderRadius: '12px',
+              padding: '16px',
+            }}
+          >
+            <div style={{ color: '#6b7280', fontSize: '14px', marginBottom: '4px' }}>
+              Final Score
+            </div>
+            <div style={{ fontSize: '28px', fontWeight: 'bold', color: '#3b82f6' }}>
+              {state.score}
+            </div>
+          </div>
+
+          <div
+            style={{
+              background: '#f3f4f6',
+              borderRadius: '12px',
+              padding: '16px',
+            }}
+          >
+            <div style={{ color: '#6b7280', fontSize: '14px', marginBottom: '4px' }}>
+              Best Streak
+            </div>
+            <div style={{ fontSize: '28px', fontWeight: 'bold', color: '#10b981' }}>
+              {state.bestStreak} 🔥
+            </div>
+          </div>
+
+          <div
+            style={{
+              background: '#f3f4f6',
+              borderRadius: '12px',
+              padding: '16px',
+            }}
+          >
+            <div style={{ color: '#6b7280', fontSize: '14px', marginBottom: '4px' }}>
+              Total Questions
+            </div>
+            <div style={{ fontSize: '28px', fontWeight: 'bold', color: '#f59e0b' }}>
+              {state.totalQuestions}
+            </div>
+          </div>
+
+          <div
+            style={{
+              background: '#f3f4f6',
+              borderRadius: '12px',
+              padding: '16px',
+            }}
+          >
+            <div style={{ color: '#6b7280', fontSize: '14px', marginBottom: '4px' }}>Accuracy</div>
+            <div style={{ fontSize: '28px', fontWeight: 'bold', color: '#8b5cf6' }}>
+              {state.totalQuestions > 0
+                ? Math.round((state.correctAnswers / state.totalQuestions) * 100)
+                : 0}
+              %
+            </div>
+          </div>
+        </div>
+
+        {/* Final Standings */}
+        <div
+          style={{
+            marginBottom: '32px',
+            textAlign: 'left',
+          }}
+        >
+          <h3
+            style={{
+              fontSize: '18px',
+              fontWeight: 'bold',
+              color: '#1f2937',
+              marginBottom: '12px',
+            }}
+          >
+            Final Standings
+          </h3>
+
+          {[
+            { name: 'You', position: state.correctAnswers, icon: '👤' },
+            ...state.aiRacers.map((racer) => ({
+              name: racer.name,
+              position: racer.position,
+              icon: racer.icon,
+            })),
+          ]
+            .sort((a, b) => b.position - a.position)
+            .map((racer, index) => (
+              <div
+                key={racer.name}
+                style={{
+                  display: 'flex',
+                  alignItems: 'center',
+                  justifyContent: 'space-between',
+                  padding: '12px',
+                  background: racer.name === 'You' ? '#eff6ff' : '#f9fafb',
+                  borderRadius: '8px',
+                  marginBottom: '8px',
+                  border: racer.name === 'You' ? '2px solid #3b82f6' : 'none',
+                }}
+              >
+                <div style={{ display: 'flex', alignItems: 'center', gap: '12px' }}>
+                  <div
+                    style={{
+                      fontSize: '24px',
+                      fontWeight: 'bold',
+                      color: '#9ca3af',
+                      minWidth: '32px',
+                    }}
+                  >
+                    #{index + 1}
+                  </div>
+                  <div style={{ fontSize: '20px' }}>{racer.icon}</div>
+                  <div style={{ fontWeight: racer.name === 'You' ? 'bold' : 'normal' }}>
+                    {racer.name}
+                  </div>
+                </div>
+                <div style={{ fontSize: '18px', fontWeight: 'bold', color: '#6b7280' }}>
+                  {Math.floor(racer.position)}
+                </div>
+              </div>
+            ))}
+        </div>
+
+        {/* Buttons */}
+        <div
+          style={{
+            display: 'flex',
+            gap: '12px',
+          }}
+        >
+          <button
+            onClick={() => dispatch({ type: 'RESET_GAME' })}
+            style={{
+              flex: 1,
+              background: 'linear-gradient(135deg, #667eea 0%, #764ba2 100%)',
+              color: 'white',
+              padding: '16px 32px',
+              borderRadius: '12px',
+              fontSize: '18px',
+              fontWeight: 'bold',
+              border: 'none',
+              cursor: 'pointer',
+              transition: 'transform 0.2s',
+              boxShadow: '0 4px 12px rgba(102, 126, 234, 0.4)',
+            }}
+            onMouseEnter={(e) => {
+              e.currentTarget.style.transform = 'translateY(-2px)'
+            }}
+            onMouseLeave={(e) => {
+              e.currentTarget.style.transform = 'translateY(0)'
+            }}
+          >
+            Race Again
+          </button>
+        </div>
+      </div>
+    </div>
+  )
+}
+
+function getOrdinalSuffix(num: number): string {
+  if (num === 1) return 'st'
+  if (num === 2) return 'nd'
+  if (num === 3) return 'rd'
+  return 'th'
+}
--- a/apps/web/src/app/arcade/complement-race/components/PassengerCard.tsx
+++ b/apps/web/src/app/arcade/complement-race/components/PassengerCard.tsx
@@ -0,0 +1,249 @@
+'use client'
+
+import { memo } from 'react'
+import type { Passenger, Station } from '../lib/gameTypes'
+
+interface PassengerCardProps {
+  passenger: Passenger
+  originStation: Station | undefined
+  destinationStation: Station | undefined
+}
+
+export const PassengerCard = memo(function PassengerCard({
+  passenger,
+  originStation,
+  destinationStation,
+}: PassengerCardProps) {
+  if (!destinationStation || !originStation) return null
+
+  // Vintage train station colors
+  const bgColor = passenger.isDelivered
+    ? '#1a3a1a' // Dark green for delivered
+    : !passenger.isBoarded
+      ? '#2a2419' // Dark brown/sepia for waiting
+      : passenger.isUrgent
+        ? '#3a2419' // Dark red-brown for urgent
+        : '#1a2a3a' // Dark blue for aboard
+
+  const accentColor = passenger.isDelivered
+    ? '#4ade80' // Green
+    : !passenger.isBoarded
+      ? '#d4af37' // Gold for waiting
+      : passenger.isUrgent
+        ? '#ff6b35' // Orange-red for urgent
+        : '#60a5fa' // Blue for aboard
+
+  const borderColor =
+    passenger.isUrgent && passenger.isBoarded && !passenger.isDelivered ? '#ff6b35' : '#d4af37'
+
+  return (
+    <div
+      style={{
+        background: bgColor,
+        border: `2px solid ${borderColor}`,
+        borderRadius: '4px',
+        padding: '8px 10px',
+        minWidth: '220px',
+        maxWidth: '280px',
+        boxShadow:
+          passenger.isUrgent && !passenger.isDelivered && passenger.isBoarded
+            ? '0 0 16px rgba(255, 107, 53, 0.5)'
+            : '0 4px 12px rgba(0, 0, 0, 0.4)',
+        position: 'relative',
+        fontFamily: '"Courier New", Courier, monospace',
+        animation:
+          passenger.isUrgent && !passenger.isDelivered && passenger.isBoarded
+            ? 'urgentFlicker 1.5s ease-in-out infinite'
+            : 'none',
+        transition: 'all 0.3s ease',
+      }}
+    >
+      {/* Top row: Passenger info and status */}
+      <div
+        style={{
+          display: 'flex',
+          alignItems: 'flex-start',
+          justifyContent: 'space-between',
+          marginBottom: '6px',
+          borderBottom: `1px solid ${accentColor}33`,
+          paddingBottom: '4px',
+          paddingRight: '42px', // Make room for points badge
+        }}
+      >
+        <div
+          style={{
+            display: 'flex',
+            alignItems: 'center',
+            gap: '6px',
+            flex: 1,
+          }}
+        >
+          <div style={{ fontSize: '20px', lineHeight: '1' }}>
+            {passenger.isDelivered ? '✅' : passenger.avatar}
+          </div>
+          <div
+            style={{
+              fontSize: '11px',
+              fontWeight: 'bold',
+              color: accentColor,
+              letterSpacing: '0.5px',
+              textTransform: 'uppercase',
+            }}
+          >
+            {passenger.name}
+          </div>
+        </div>
+
+        {/* Status indicator */}
+        <div
+          style={{
+            fontSize: '9px',
+            color: accentColor,
+            fontWeight: 'bold',
+            letterSpacing: '0.5px',
+            background: `${accentColor}22`,
+            padding: '2px 6px',
+            borderRadius: '2px',
+            border: `1px solid ${accentColor}66`,
+            whiteSpace: 'nowrap',
+            marginTop: '0',
+          }}
+        >
+          {passenger.isDelivered ? 'DLVRD' : passenger.isBoarded ? 'BOARD' : 'WAIT'}
+        </div>
+      </div>
+
+      {/* Route information */}
+      <div
+        style={{
+          display: 'flex',
+          flexDirection: 'column',
+          gap: '3px',
+          fontSize: '10px',
+          color: '#e8d4a0',
+        }}
+      >
+        {/* From station */}
+        <div
+          style={{
+            display: 'flex',
+            alignItems: 'center',
+            gap: '6px',
+          }}
+        >
+          <span
+            style={{
+              color: accentColor,
+              fontSize: '8px',
+              fontWeight: 'bold',
+              width: '28px',
+              letterSpacing: '0.3px',
+            }}
+          >
+            FROM:
+          </span>
+          <span style={{ fontSize: '14px', lineHeight: '1' }}>{originStation.icon}</span>
+          <span
+            style={{
+              fontWeight: '600',
+              fontSize: '10px',
+              letterSpacing: '0.3px',
+            }}
+          >
+            {originStation.name}
+          </span>
+        </div>
+
+        {/* To station */}
+        <div
+          style={{
+            display: 'flex',
+            alignItems: 'center',
+            gap: '6px',
+          }}
+        >
+          <span
+            style={{
+              color: accentColor,
+              fontSize: '8px',
+              fontWeight: 'bold',
+              width: '28px',
+              letterSpacing: '0.3px',
+            }}
+          >
+            TO:
+          </span>
+          <span style={{ fontSize: '14px', lineHeight: '1' }}>{destinationStation.icon}</span>
+          <span
+            style={{
+              fontWeight: '600',
+              fontSize: '10px',
+              letterSpacing: '0.3px',
+            }}
+          >
+            {destinationStation.name}
+          </span>
+        </div>
+      </div>
+
+      {/* Points badge */}
+      {!passenger.isDelivered && (
+        <div
+          style={{
+            position: 'absolute',
+            top: '6px',
+            right: '6px',
+            background: `${accentColor}33`,
+            border: `1px solid ${accentColor}`,
+            borderRadius: '2px',
+            padding: '2px 6px',
+            fontSize: '10px',
+            fontWeight: 'bold',
+            color: accentColor,
+            letterSpacing: '0.5px',
+          }}
+        >
+          {passenger.isUrgent ? '+20' : '+10'}
+        </div>
+      )}
+
+      {/* Urgent indicator */}
+      {passenger.isUrgent && !passenger.isDelivered && passenger.isBoarded && (
+        <div
+          style={{
+            position: 'absolute',
+            left: '8px',
+            bottom: '6px',
+            fontSize: '10px',
+            animation: 'urgentBlink 0.8s ease-in-out infinite',
+            filter: 'drop-shadow(0 0 4px rgba(255, 107, 53, 0.8))',
+          }}
+        >
+          ⚠️
+        </div>
+      )}
+
+      <style>{`
+        @keyframes urgentFlicker {
+          0%, 100% {
+            box-shadow: 0 0 16px rgba(255, 107, 53, 0.5);
+            border-color: #ff6b35;
+          }
+          50% {
+            box-shadow: 0 0 24px rgba(255, 107, 53, 0.8);
+            border-color: #ffaa35;
+          }
+        }
+
+        @keyframes urgentBlink {
+          0%, 100% {
+            opacity: 1;
+          }
+          50% {
+            opacity: 0.3;
+          }
+        }
+      `}</style>
+    </div>
+  )
+})
--- a/apps/web/src/app/arcade/complement-race/components/PressureGauge.tsx
+++ b/apps/web/src/app/arcade/complement-race/components/PressureGauge.tsx
@@ -0,0 +1,180 @@
+'use client'
+
+import { animated, useSpring } from '@react-spring/web'
+import { AbacusReact } from '@soroban/abacus-react'
+
+interface PressureGaugeProps {
+  pressure: number // 0-150 PSI
+}
+
+export function PressureGauge({ pressure }: PressureGaugeProps) {
+  const maxPressure = 150
+
+  // Animate pressure value smoothly with spring physics
+  const spring = useSpring({
+    pressure,
+    config: {
+      tension: 120,
+      friction: 14,
+      clamp: false,
+    },
+  })
+
+  // Calculate needle angle - sweeps 180° from left to right
+  // 0 PSI = 180° (pointing left), 150 PSI = 0° (pointing right)
+  const angle = spring.pressure.to((p) => 180 - (p / maxPressure) * 180)
+
+  // Get pressure color (animated)
+  const color = spring.pressure.to((p) => {
+    if (p < 50) return '#ef4444' // Red (low)
+    if (p < 100) return '#f59e0b' // Orange (medium)
+    return '#10b981' // Green (high)
+  })
+
+  return (
+    <div
+      style={{
+        position: 'relative',
+        background: 'rgba(255, 255, 255, 0.95)',
+        padding: '16px',
+        borderRadius: '12px',
+        minWidth: '220px',
+        boxShadow: '0 2px 8px rgba(0, 0, 0, 0.2)',
+      }}
+    >
+      {/* Title */}
+      <div
+        style={{
+          fontSize: '12px',
+          color: '#6b7280',
+          marginBottom: '8px',
+          fontWeight: 'bold',
+          textAlign: 'center',
+        }}
+      >
+        PRESSURE
+      </div>
+
+      {/* SVG Gauge */}
+      <svg
+        viewBox="-40 -20 280 170"
+        style={{
+          width: '100%',
+          height: 'auto',
+          marginBottom: '8px',
+        }}
+      >
+        {/* Background arc - semicircle from left to right (bottom half) */}
+        <path
+          d="M 20 100 A 80 80 0 0 1 180 100"
+          fill="none"
+          stroke="#e5e7eb"
+          strokeWidth="8"
+          strokeLinecap="round"
+        />
+
+        {/* Tick marks */}
+        {[0, 50, 100, 150].map((psi, index) => {
+          // Angle from 180° (left) to 0° (right)
+          const tickAngle = 180 - (psi / maxPressure) * 180
+          const tickRad = (tickAngle * Math.PI) / 180
+          const x1 = 100 + Math.cos(tickRad) * 70
+          const y1 = 100 - Math.sin(tickRad) * 70 // Subtract for SVG coords
+          const x2 = 100 + Math.cos(tickRad) * 80
+          const y2 = 100 - Math.sin(tickRad) * 80 // Subtract for SVG coords
+
+          // Position for abacus label
+          const labelX = 100 + Math.cos(tickRad) * 112
+          const labelY = 100 - Math.sin(tickRad) * 112
+
+          return (
+            <g key={`tick-${index}`}>
+              <line
+                x1={x1}
+                y1={y1}
+                x2={x2}
+                y2={y2}
+                stroke="#6b7280"
+                strokeWidth="2"
+                strokeLinecap="round"
+              />
+              <foreignObject x={labelX - 30} y={labelY - 25} width="60" height="100">
+                <div
+                  style={{
+                    display: 'flex',
+                    alignItems: 'center',
+                    justifyContent: 'center',
+                    lineHeight: 0,
+                  }}
+                >
+                  <AbacusReact
+                    value={psi}
+                    columns={3}
+                    interactive={false}
+                    showNumbers={false}
+                    hideInactiveBeads={false}
+                    scaleFactor={0.6}
+                    customStyles={{
+                      columnPosts: { opacity: 0 },
+                    }}
+                  />
+                </div>
+              </foreignObject>
+            </g>
+          )
+        })}
+
+        {/* Center pivot */}
+        <circle cx="100" cy="100" r="4" fill="#1f2937" />
+
+        {/* Needle - animated */}
+        <animated.line
+          x1="100"
+          y1="100"
+          x2={angle.to((a) => 100 + Math.cos((a * Math.PI) / 180) * 70)}
+          y2={angle.to((a) => 100 - Math.sin((a * Math.PI) / 180) * 70)}
+          stroke={color}
+          strokeWidth="3"
+          strokeLinecap="round"
+          style={{
+            filter: color.to((c) => `drop-shadow(0 2px 3px ${c})`),
+          }}
+        />
+      </svg>
+
+      {/* Abacus readout */}
+      <div
+        style={{
+          textAlign: 'center',
+          display: 'flex',
+          alignItems: 'center',
+          justifyContent: 'center',
+          gap: '8px',
+          minHeight: '32px',
+        }}
+      >
+        <div
+          style={{
+            display: 'inline-flex',
+            alignItems: 'center',
+            justifyContent: 'center',
+            lineHeight: 0,
+          }}
+        >
+          <AbacusReact
+            value={Math.round(pressure)}
+            columns={3}
+            interactive={false}
+            showNumbers={false}
+            hideInactiveBeads={true}
+            scaleFactor={0.35}
+            customStyles={{
+              columnPosts: { opacity: 0 },
+            }}
+          />
+        </div>
+        <span style={{ fontSize: '12px', color: '#6b7280', fontWeight: 'bold' }}>PSI</span>
+      </div>
+    </div>
+  )
+}
--- a/apps/web/src/app/arcade/complement-race/components/RaceTrack/CircularTrack.tsx
+++ b/apps/web/src/app/arcade/complement-race/components/RaceTrack/CircularTrack.tsx
@@ -0,0 +1,489 @@
+'use client'
+
+import { useEffect, useState } from 'react'
+import { useGameMode } from '@/contexts/GameModeContext'
+import { useUserProfile } from '@/contexts/UserProfileContext'
+import { useComplementRace } from '../../context/ComplementRaceContext'
+import { useSoundEffects } from '../../hooks/useSoundEffects'
+import type { AIRacer } from '../../lib/gameTypes'
+import { SpeechBubble } from '../AISystem/SpeechBubble'
+
+interface CircularTrackProps {
+  playerProgress: number
+  playerLap: number
+  aiRacers: AIRacer[]
+  aiLaps: Map<string, number>
+}
+
+export function CircularTrack({ playerProgress, playerLap, aiRacers, aiLaps }: CircularTrackProps) {
+  const { state, dispatch } = useComplementRace()
+  const { players } = useGameMode()
+  const { profile: _profile } = useUserProfile()
+  const { playSound } = useSoundEffects()
+  const [celebrationCooldown, setCelebrationCooldown] = useState<Set<string>>(new Set())
+
+  // Get the first active player's emoji
+  const activePlayers = Array.from(players.values()).filter((p) => p.id)
+  const firstActivePlayer = activePlayers[0]
+  const playerEmoji = firstActivePlayer?.emoji ?? '👤'
+  const [dimensions, setDimensions] = useState({ width: 600, height: 400 })
+
+  // Update dimensions on mount and resize
+  useEffect(() => {
+    const updateDimensions = () => {
+      const vw = window.innerWidth
+      const vh = window.innerHeight
+      const isLandscape = vw > vh
+
+      if (isLandscape) {
+        // Landscape: wider track (emphasize horizontal straights)
+        const width = Math.min(vw * 0.75, 800)
+        const height = Math.min(vh * 0.5, 350)
+        setDimensions({ width, height })
+      } else {
+        // Portrait: taller track (emphasize vertical straights)
+        const width = Math.min(vw * 0.85, 350)
+        const height = Math.min(vh * 0.5, 550)
+        setDimensions({ width, height })
+      }
+    }
+
+    updateDimensions()
+    window.addEventListener('resize', updateDimensions)
+    return () => window.removeEventListener('resize', updateDimensions)
+  }, [])
+
+  const padding = 40
+  const trackWidth = dimensions.width - padding * 2
+  const trackHeight = dimensions.height - padding * 2
+
+  // For a rounded rectangle track, we have straight sections and curved ends
+  const straightLength = Math.max(trackWidth, trackHeight) - Math.min(trackWidth, trackHeight)
+  const radius = Math.min(trackWidth, trackHeight) / 2
+  const isHorizontal = trackWidth > trackHeight
+
+  // Calculate position on rounded rectangle track
+  const getCircularPosition = (progress: number) => {
+    const progressPerLap = 50
+    const normalizedProgress = (progress % progressPerLap) / progressPerLap
+
+    // Track perimeter consists of: 2 straights + 2 semicircles
+    const straightPerim = straightLength
+    const curvePerim = Math.PI * radius
+    const totalPerim = 2 * straightPerim + 2 * curvePerim
+
+    const distanceAlongTrack = normalizedProgress * totalPerim
+
+    const centerX = dimensions.width / 2
+    const centerY = dimensions.height / 2
+
+    let x: number, y: number, angle: number
+
+    if (isHorizontal) {
+      // Horizontal track: straight sections on top/bottom, curves on left/right
+      const topStraightEnd = straightPerim
+      const rightCurveEnd = topStraightEnd + curvePerim
+      const bottomStraightEnd = rightCurveEnd + straightPerim
+      const _leftCurveEnd = bottomStraightEnd + curvePerim
+
+      if (distanceAlongTrack < topStraightEnd) {
+        // Top straight (moving right)
+        const t = distanceAlongTrack / straightPerim
+        x = centerX - straightLength / 2 + t * straightLength
+        y = centerY - radius
+        angle = 90
+      } else if (distanceAlongTrack < rightCurveEnd) {
+        // Right curve
+        const curveProgress = (distanceAlongTrack - topStraightEnd) / curvePerim
+        const curveAngle = curveProgress * Math.PI - Math.PI / 2
+        x = centerX + straightLength / 2 + radius * Math.cos(curveAngle)
+        y = centerY + radius * Math.sin(curveAngle)
+        angle = curveProgress * 180 + 90
+      } else if (distanceAlongTrack < bottomStraightEnd) {
+        // Bottom straight (moving left)
+        const t = (distanceAlongTrack - rightCurveEnd) / straightPerim
+        x = centerX + straightLength / 2 - t * straightLength
+        y = centerY + radius
+        angle = 270
+      } else {
+        // Left curve
+        const curveProgress = (distanceAlongTrack - bottomStraightEnd) / curvePerim
+        const curveAngle = curveProgress * Math.PI + Math.PI / 2
+        x = centerX - straightLength / 2 + radius * Math.cos(curveAngle)
+        y = centerY + radius * Math.sin(curveAngle)
+        angle = curveProgress * 180 + 270
+      }
+    } else {
+      // Vertical track: straight sections on left/right, curves on top/bottom
+      const leftStraightEnd = straightPerim
+      const bottomCurveEnd = leftStraightEnd + curvePerim
+      const rightStraightEnd = bottomCurveEnd + straightPerim
+      const _topCurveEnd = rightStraightEnd + curvePerim
+
+      if (distanceAlongTrack < leftStraightEnd) {
+        // Left straight (moving down)
+        const t = distanceAlongTrack / straightPerim
+        x = centerX - radius
+        y = centerY - straightLength / 2 + t * straightLength
+        angle = 180
+      } else if (distanceAlongTrack < bottomCurveEnd) {
+        // Bottom curve
+        const curveProgress = (distanceAlongTrack - leftStraightEnd) / curvePerim
+        const curveAngle = curveProgress * Math.PI
+        x = centerX + radius * Math.cos(curveAngle)
+        y = centerY + straightLength / 2 + radius * Math.sin(curveAngle)
+        angle = curveProgress * 180 + 180
+      } else if (distanceAlongTrack < rightStraightEnd) {
+        // Right straight (moving up)
+        const t = (distanceAlongTrack - bottomCurveEnd) / straightPerim
+        x = centerX + radius
+        y = centerY + straightLength / 2 - t * straightLength
+        angle = 0
+      } else {
+        // Top curve
+        const curveProgress = (distanceAlongTrack - rightStraightEnd) / curvePerim
+        const curveAngle = curveProgress * Math.PI + Math.PI
+        x = centerX + radius * Math.cos(curveAngle)
+        y = centerY - straightLength / 2 + radius * Math.sin(curveAngle)
+        angle = curveProgress * 180
+      }
+    }
+
+    return { x, y, angle }
+  }
+
+  // Check for lap completions and show celebrations
+  useEffect(() => {
+    // Check player lap
+    const playerCurrentLap = Math.floor(playerProgress / 50)
+    if (playerCurrentLap > playerLap && !celebrationCooldown.has('player')) {
+      dispatch({ type: 'COMPLETE_LAP', racerId: 'player' })
+      // Play celebration sound (line 12801)
+      playSound('lap_celebration', 0.6)
+      setCelebrationCooldown((prev) => new Set(prev).add('player'))
+      setTimeout(() => {
+        setCelebrationCooldown((prev) => {
+          const next = new Set(prev)
+          next.delete('player')
+          return next
+        })
+      }, 2000)
+    }
+
+    // Check AI laps
+    aiRacers.forEach((racer) => {
+      const aiCurrentLap = Math.floor(racer.position / 50)
+      const aiPreviousLap = aiLaps.get(racer.id) || 0
+      if (aiCurrentLap > aiPreviousLap && !celebrationCooldown.has(racer.id)) {
+        dispatch({ type: 'COMPLETE_LAP', racerId: racer.id })
+        setCelebrationCooldown((prev) => new Set(prev).add(racer.id))
+        setTimeout(() => {
+          setCelebrationCooldown((prev) => {
+            const next = new Set(prev)
+            next.delete(racer.id)
+            return next
+          })
+        }, 2000)
+      }
+    })
+  }, [
+    playerProgress,
+    playerLap,
+    aiRacers,
+    aiLaps,
+    celebrationCooldown,
+    dispatch, // Play celebration sound (line 12801)
+    playSound,
+  ])
+
+  const playerPos = getCircularPosition(playerProgress)
+
+  // Create rounded rectangle path with wider curves (banking effect)
+  const createRoundedRectPath = (radiusOffset: number, isOuter: boolean = false) => {
+    const centerX = dimensions.width / 2
+    const centerY = dimensions.height / 2
+
+    // Make curves wider by increasing radius more on outer edges
+    const curveWidthBonus = isOuter ? radiusOffset * 0.15 : radiusOffset * -0.1
+    const r = radius + radiusOffset + curveWidthBonus
+
+    if (isHorizontal) {
+      // Horizontal track - curved ends on left/right
+      const leftCenterX = centerX - straightLength / 2
+      const rightCenterX = centerX + straightLength / 2
+      const curveTopY = centerY - r
+      const curveBottomY = centerY + r
+
+      return `
+        M ${leftCenterX} ${curveTopY}
+        L ${rightCenterX} ${curveTopY}
+        A ${r} ${r} 0 0 1 ${rightCenterX} ${curveBottomY}
+        L ${leftCenterX} ${curveBottomY}
+        A ${r} ${r} 0 0 1 ${leftCenterX} ${curveTopY}
+        Z
+      `
+    } else {
+      // Vertical track - curved ends on top/bottom
+      const topCenterY = centerY - straightLength / 2
+      const bottomCenterY = centerY + straightLength / 2
+      const curveLeftX = centerX - r
+      const curveRightX = centerX + r
+
+      return `
+        M ${curveLeftX} ${topCenterY}
+        L ${curveLeftX} ${bottomCenterY}
+        A ${r} ${r} 0 0 0 ${curveRightX} ${bottomCenterY}
+        L ${curveRightX} ${topCenterY}
+        A ${r} ${r} 0 0 0 ${curveLeftX} ${topCenterY}
+        Z
+      `
+    }
+  }
+
+  return (
+    <div
+      data-component="circular-track"
+      style={{
+        position: 'relative',
+        width: `${dimensions.width}px`,
+        height: `${dimensions.height}px`,
+        margin: '0 auto',
+      }}
+    >
+      {/* SVG Track */}
+      <svg
+        data-component="track-svg"
+        width={dimensions.width}
+        height={dimensions.height}
+        style={{
+          position: 'absolute',
+          top: 0,
+          left: 0,
+        }}
+      >
+        {/* Infield grass */}
+        <path d={createRoundedRectPath(15, false)} fill="#7cb342" stroke="none" />
+
+        {/* Track background - reddish clay color */}
+        <path d={createRoundedRectPath(-10, true)} fill="#d97757" stroke="none" />
+
+        {/* Track outer edge - white boundary */}
+        <path d={createRoundedRectPath(-15, true)} fill="none" stroke="white" strokeWidth="3" />
+
+        {/* Track inner edge - white boundary */}
+        <path d={createRoundedRectPath(15, false)} fill="none" stroke="white" strokeWidth="3" />
+
+        {/* Lane markers - dashed white lines */}
+        {[-5, 0, 5].map((offset) => (
+          <path
+            key={offset}
+            d={createRoundedRectPath(offset, offset < 0)}
+            fill="none"
+            stroke="white"
+            strokeWidth="1.5"
+            strokeDasharray="8 8"
+            opacity="0.6"
+          />
+        ))}
+
+        {/* Start/Finish line - checkered flag pattern */}
+        {(() => {
+          const centerX = dimensions.width / 2
+          const centerY = dimensions.height / 2
+          const trackThickness = 35 // Track width from inner to outer edge
+
+          if (isHorizontal) {
+            // Horizontal track: vertical finish line crossing the top straight
+            const x = centerX
+            const yStart = centerY - radius - 18 // Outer edge
+            const squareSize = trackThickness / 6
+            const lineWidth = 12
+            return (
+              <g>
+                {/* Checkered pattern - vertical line */}
+                {[0, 1, 2, 3, 4, 5].map((i) => (
+                  <rect
+                    key={i}
+                    x={x - lineWidth / 2}
+                    y={yStart + squareSize * i}
+                    width={lineWidth}
+                    height={squareSize}
+                    fill={i % 2 === 0 ? 'black' : 'white'}
+                  />
+                ))}
+              </g>
+            )
+          } else {
+            // Vertical track: horizontal finish line crossing the left straight
+            const xStart = centerX - radius - 18 // Outer edge
+            const y = centerY
+            const squareSize = trackThickness / 6
+            const lineWidth = 12
+            return (
+              <g>
+                {/* Checkered pattern - horizontal line */}
+                {[0, 1, 2, 3, 4, 5].map((i) => (
+                  <rect
+                    key={i}
+                    x={xStart + squareSize * i}
+                    y={y - lineWidth / 2}
+                    width={squareSize}
+                    height={lineWidth}
+                    fill={i % 2 === 0 ? 'black' : 'white'}
+                  />
+                ))}
+              </g>
+            )
+          }
+        })()}
+
+        {/* Distance markers (quarter points) */}
+        {[0.25, 0.5, 0.75].map((fraction) => {
+          const pos = getCircularPosition(fraction * 50)
+          const markerLength = 12
+          const perpAngle = (pos.angle + 90) * (Math.PI / 180)
+          const x1 = pos.x - markerLength * Math.cos(perpAngle)
+          const y1 = pos.y - markerLength * Math.sin(perpAngle)
+          const x2 = pos.x + markerLength * Math.cos(perpAngle)
+          const y2 = pos.y + markerLength * Math.sin(perpAngle)
+          return (
+            <line
+              key={fraction}
+              x1={x1}
+              y1={y1}
+              x2={x2}
+              y2={y2}
+              stroke="white"
+              strokeWidth="3"
+              strokeLinecap="round"
+            />
+          )
+        })}
+      </svg>
+
+      {/* Player racer */}
+      <div
+        style={{
+          position: 'absolute',
+          left: `${playerPos.x}px`,
+          top: `${playerPos.y}px`,
+          transform: `translate(-50%, -50%) rotate(${playerPos.angle}deg)`,
+          fontSize: '32px',
+          filter: 'drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2))',
+          zIndex: 10,
+          transition: 'left 0.3s ease-out, top 0.3s ease-out',
+        }}
+      >
+        {playerEmoji}
+      </div>
+
+      {/* AI racers */}
+      {aiRacers.map((racer, _index) => {
+        const aiPos = getCircularPosition(racer.position)
+        const activeBubble = state.activeSpeechBubbles.get(racer.id)
+
+        return (
+          <div
+            key={racer.id}
+            style={{
+              position: 'absolute',
+              left: `${aiPos.x}px`,
+              top: `${aiPos.y}px`,
+              transform: `translate(-50%, -50%) rotate(${aiPos.angle}deg)`,
+              fontSize: '28px',
+              filter: 'drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2))',
+              zIndex: 5,
+              transition: 'left 0.2s linear, top 0.2s linear',
+            }}
+          >
+            {racer.icon}
+            {activeBubble && (
+              <div
+                style={{
+                  transform: `rotate(${-aiPos.angle}deg)`, // Counter-rotate bubble
+                }}
+              >
+                <SpeechBubble
+                  message={activeBubble}
+                  onHide={() => dispatch({ type: 'CLEAR_AI_COMMENT', racerId: racer.id })}
+                />
+              </div>
+            )}
+          </div>
+        )
+      })}
+
+      {/* Lap counter */}
+      <div
+        style={{
+          position: 'absolute',
+          top: '50%',
+          left: '50%',
+          transform: 'translate(-50%, -50%)',
+          background: 'rgba(255, 255, 255, 0.95)',
+          borderRadius: '50%',
+          width: '120px',
+          height: '120px',
+          display: 'flex',
+          flexDirection: 'column',
+          alignItems: 'center',
+          justifyContent: 'center',
+          boxShadow: '0 4px 12px rgba(0, 0, 0, 0.15)',
+          border: '3px solid #3b82f6',
+        }}
+      >
+        <div
+          style={{
+            fontSize: '14px',
+            color: '#6b7280',
+            marginBottom: '4px',
+            fontWeight: 'bold',
+          }}
+        >
+          Lap
+        </div>
+        <div
+          style={{
+            fontSize: '36px',
+            fontWeight: 'bold',
+            color: '#3b82f6',
+          }}
+        >
+          {playerLap + 1}
+        </div>
+        <div
+          style={{
+            fontSize: '12px',
+            color: '#9ca3af',
+            marginTop: '4px',
+          }}
+        >
+          {Math.floor(((playerProgress % 50) / 50) * 100)}%
+        </div>
+      </div>
+
+      {/* Lap celebration */}
+      {celebrationCooldown.has('player') && (
+        <div
+          style={{
+            position: 'absolute',
+            top: '20px',
+            left: '50%',
+            transform: 'translateX(-50%)',
+            background: 'linear-gradient(135deg, #fbbf24, #f59e0b)',
+            color: 'white',
+            padding: '12px 24px',
+            borderRadius: '12px',
+            fontSize: '18px',
+            fontWeight: 'bold',
+            boxShadow: '0 4px 20px rgba(251, 191, 36, 0.4)',
+            animation: 'bounce 0.5s ease',
+            zIndex: 100,
+          }}
+        >
+          🎉 Lap {playerLap + 1} Complete! 🎉
+        </div>
+      )}
+    </div>
+  )
+}
--- a/apps/web/src/app/arcade/complement-race/components/RaceTrack/GameHUD.tsx
+++ b/apps/web/src/app/arcade/complement-race/components/RaceTrack/GameHUD.tsx
@@ -0,0 +1,223 @@
+'use client'
+
+import { memo } from 'react'
+import type { ComplementQuestion, Passenger, Station } from '../../lib/gameTypes'
+import { AbacusTarget } from '../AbacusTarget'
+import { PassengerCard } from '../PassengerCard'
+import { PressureGauge } from '../PressureGauge'
+
+interface RouteTheme {
+  emoji: string
+  name: string
+}
+
+interface GameHUDProps {
+  routeTheme: RouteTheme
+  currentRoute: number
+  periodName: string
+  timeRemaining: number
+  pressure: number
+  nonDeliveredPassengers: Passenger[]
+  stations: Station[]
+  currentQuestion: ComplementQuestion | null
+  currentInput: string
+}
+
+export const GameHUD = memo(
+  ({
+    routeTheme,
+    currentRoute,
+    periodName,
+    timeRemaining,
+    pressure,
+    nonDeliveredPassengers,
+    stations,
+    currentQuestion,
+    currentInput,
+  }: GameHUDProps) => {
+    return (
+      <>
+        {/* Route and time of day indicator */}
+        <div
+          data-component="route-info"
+          style={{
+            position: 'absolute',
+            top: '10px',
+            left: '10px',
+            display: 'flex',
+            flexDirection: 'column',
+            gap: '8px',
+            zIndex: 10,
+          }}
+        >
+          {/* Current Route */}
+          <div
+            style={{
+              background: 'rgba(0, 0, 0, 0.3)',
+              color: 'white',
+              padding: '8px 14px',
+              borderRadius: '8px',
+              fontSize: '16px',
+              fontWeight: 'bold',
+              backdropFilter: 'blur(4px)',
+              display: 'flex',
+              alignItems: 'center',
+              gap: '8px',
+            }}
+          >
+            <span style={{ fontSize: '20px' }}>{routeTheme.emoji}</span>
+            <div>
+              <div style={{ fontSize: '14px', opacity: 0.8 }}>Route {currentRoute}</div>
+              <div style={{ fontSize: '12px', opacity: 0.9 }}>{routeTheme.name}</div>
+            </div>
+          </div>
+
+          {/* Time of Day */}
+          <div
+            style={{
+              background: 'rgba(0, 0, 0, 0.3)',
+              color: 'white',
+              padding: '6px 12px',
+              borderRadius: '8px',
+              fontSize: '14px',
+              fontWeight: 'bold',
+              backdropFilter: 'blur(4px)',
+            }}
+          >
+            {periodName}
+          </div>
+        </div>
+
+        {/* Time remaining */}
+        <div
+          data-component="time-remaining"
+          style={{
+            position: 'absolute',
+            top: '10px',
+            right: '10px',
+            background: 'rgba(0, 0, 0, 0.3)',
+            color: 'white',
+            padding: '6px 12px',
+            borderRadius: '8px',
+            fontSize: '18px',
+            fontWeight: 'bold',
+            backdropFilter: 'blur(4px)',
+            zIndex: 10,
+          }}
+        >
+          ⏱️ {timeRemaining}s
+        </div>
+
+        {/* Pressure gauge */}
+        <div
+          data-component="pressure-gauge-container"
+          style={{
+            position: 'fixed',
+            bottom: '20px',
+            left: '20px',
+            zIndex: 1000,
+            width: '120px',
+          }}
+        >
+          <PressureGauge pressure={pressure} />
+        </div>
+
+        {/* Passenger cards - show all non-delivered passengers */}
+        {nonDeliveredPassengers.length > 0 && (
+          <div
+            data-component="passenger-list"
+            style={{
+              position: 'fixed',
+              bottom: '20px',
+              right: '20px',
+              display: 'flex',
+              flexDirection: 'column-reverse',
+              gap: '8px',
+              zIndex: 1000,
+              maxHeight: 'calc(100vh - 40px)',
+              overflowY: 'auto',
+            }}
+          >
+            {nonDeliveredPassengers.map((passenger) => (
+              <PassengerCard
+                key={passenger.id}
+                passenger={passenger}
+                originStation={stations.find((s) => s.id === passenger.originStationId)}
+                destinationStation={stations.find((s) => s.id === passenger.destinationStationId)}
+              />
+            ))}
+          </div>
+        )}
+
+        {/* Question Display - centered at bottom, equation-focused */}
+        {currentQuestion && (
+          <div
+            data-component="sprint-question-display"
+            style={{
+              position: 'fixed',
+              bottom: '20px',
+              left: '50%',
+              transform: 'translateX(-50%)',
+              background: 'rgba(255, 255, 255, 0.98)',
+              borderRadius: '24px',
+              padding: '28px 50px',
+              boxShadow: '0 16px 40px rgba(0, 0, 0, 0.5), 0 0 0 5px rgba(59, 130, 246, 0.4)',
+              backdropFilter: 'blur(12px)',
+              border: '4px solid rgba(255, 255, 255, 0.95)',
+              zIndex: 1000,
+            }}
+          >
+            {/* Complement equation as main focus */}
+            <div
+              data-element="sprint-question-equation"
+              style={{
+                fontSize: '96px',
+                fontWeight: 'bold',
+                color: '#1f2937',
+                lineHeight: '1.1',
+                display: 'flex',
+                alignItems: 'center',
+                gap: '20px',
+                justifyContent: 'center',
+              }}
+            >
+              <span
+                style={{
+                  background: 'linear-gradient(135deg, #3b82f6, #8b5cf6)',
+                  color: 'white',
+                  padding: '12px 32px',
+                  borderRadius: '16px',
+                  minWidth: '140px',
+                  display: 'inline-block',
+                  textShadow: '0 3px 10px rgba(0, 0, 0, 0.3)',
+                }}
+              >
+                {currentInput || '?'}
+              </span>
+              <span style={{ color: '#6b7280' }}>+</span>
+              {currentQuestion.showAsAbacus ? (
+                <div
+                  style={{
+                    transform: 'scale(2.4) translateY(8%)',
+                    transformOrigin: 'center center',
+                    display: 'flex',
+                    alignItems: 'center',
+                    justifyContent: 'center',
+                  }}
+                >
+                  <AbacusTarget number={currentQuestion.number} />
+                </div>
+              ) : (
+                <span>{currentQuestion.number}</span>
+              )}
+              <span style={{ color: '#6b7280' }}>=</span>
+              <span style={{ color: '#10b981' }}>{currentQuestion.targetSum}</span>
+            </div>
+          </div>
+        )}
+      </>
+    )
+  }
+)
+
+GameHUD.displayName = 'GameHUD'
--- a/apps/web/src/app/arcade/complement-race/components/RaceTrack/LinearTrack.tsx
+++ b/apps/web/src/app/arcade/complement-race/components/RaceTrack/LinearTrack.tsx
@@ -0,0 +1,172 @@
+'use client'
+
+import { useGameMode } from '@/contexts/GameModeContext'
+import { useUserProfile } from '@/contexts/UserProfileContext'
+import { useComplementRace } from '../../context/ComplementRaceContext'
+import type { AIRacer } from '../../lib/gameTypes'
+import { SpeechBubble } from '../AISystem/SpeechBubble'
+
+interface LinearTrackProps {
+  playerProgress: number
+  aiRacers: AIRacer[]
+  raceGoal: number
+  showFinishLine?: boolean
+}
+
+export function LinearTrack({
+  playerProgress,
+  aiRacers,
+  raceGoal,
+  showFinishLine = true,
+}: LinearTrackProps) {
+  const { state, dispatch } = useComplementRace()
+  const { players } = useGameMode()
+  const { profile: _profile } = useUserProfile()
+
+  // Get the first active player's emoji
+  const activePlayers = Array.from(players.values()).filter((p) => p.id)
+  const firstActivePlayer = activePlayers[0]
+  const playerEmoji = firstActivePlayer?.emoji ?? '👤'
+
+  // Position calculation: leftPercent = Math.min(98, (progress / raceGoal) * 96 + 2)
+  // 2% minimum (start), 98% maximum (near finish), 96% range for race
+  const getPosition = (progress: number) => {
+    return Math.min(98, (progress / raceGoal) * 96 + 2)
+  }
+
+  const playerPosition = getPosition(playerProgress)
+
+  return (
+    <div
+      data-component="linear-track"
+      style={{
+        position: 'relative',
+        width: '100%',
+        height: '200px',
+        background:
+          'linear-gradient(to bottom, #87ceeb 0%, #e0f2fe 50%, #90ee90 50%, #d4f1d4 100%)',
+        borderRadius: '12px',
+        overflow: 'hidden',
+        boxShadow: '0 4px 12px rgba(0, 0, 0, 0.15)',
+        marginTop: '20px',
+      }}
+    >
+      {/* Track lines */}
+      <div
+        style={{
+          position: 'absolute',
+          top: '50%',
+          left: 0,
+          right: 0,
+          height: '2px',
+          background: 'rgba(0, 0, 0, 0.1)',
+          transform: 'translateY(-50%)',
+        }}
+      />
+
+      <div
+        style={{
+          position: 'absolute',
+          top: '40%',
+          left: 0,
+          right: 0,
+          height: '1px',
+          background: 'rgba(0, 0, 0, 0.05)',
+          transform: 'translateY(-50%)',
+        }}
+      />
+
+      <div
+        style={{
+          position: 'absolute',
+          top: '60%',
+          left: 0,
+          right: 0,
+          height: '1px',
+          background: 'rgba(0, 0, 0, 0.05)',
+          transform: 'translateY(-50%)',
+        }}
+      />
+
+      {/* Finish line */}
+      {showFinishLine && (
+        <div
+          style={{
+            position: 'absolute',
+            right: '2%',
+            top: 0,
+            bottom: 0,
+            width: '4px',
+            background:
+              'repeating-linear-gradient(0deg, black 0px, black 10px, white 10px, white 20px)',
+            boxShadow: '0 0 10px rgba(0, 0, 0, 0.3)',
+          }}
+        />
+      )}
+
+      {/* Player racer */}
+      <div
+        style={{
+          position: 'absolute',
+          left: `${playerPosition}%`,
+          top: '50%',
+          transform: 'translate(-50%, -50%)',
+          fontSize: '32px',
+          transition: 'left 0.3s ease-out',
+          filter: 'drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2))',
+          zIndex: 10,
+        }}
+      >
+        {playerEmoji}
+      </div>
+
+      {/* AI racers */}
+      {aiRacers.map((racer, index) => {
+        const aiPosition = getPosition(racer.position)
+        const activeBubble = state.activeSpeechBubbles.get(racer.id)
+
+        return (
+          <div
+            key={racer.id}
+            style={{
+              position: 'absolute',
+              left: `${aiPosition}%`,
+              top: `${35 + index * 15}%`,
+              transform: 'translate(-50%, -50%)',
+              fontSize: '28px',
+              transition: 'left 0.2s linear',
+              filter: 'drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2))',
+              zIndex: 5,
+            }}
+          >
+            {racer.icon}
+            {activeBubble && (
+              <SpeechBubble
+                message={activeBubble}
+                onHide={() => dispatch({ type: 'CLEAR_AI_COMMENT', racerId: racer.id })}
+              />
+            )}
+          </div>
+        )
+      })}
+
+      {/* Progress indicator */}
+      <div
+        style={{
+          position: 'absolute',
+          bottom: '10px',
+          left: '10px',
+          background: 'rgba(255, 255, 255, 0.9)',
+          padding: '6px 12px',
+          borderRadius: '8px',
+          fontSize: '14px',
+          fontWeight: 'bold',
+          color: '#1f2937',
+          boxShadow: '0 2px 6px rgba(0, 0, 0, 0.1)',
+        }}
+      >
+        {playerProgress} / {raceGoal}
+      </div>
+    </div>
+  )
+}
--- a/apps/web/src/app/arcade/complement-race/components/RaceTrack/RailroadTrackPath.tsx
+++ b/apps/web/src/app/arcade/complement-race/components/RaceTrack/RailroadTrackPath.tsx
@@ -0,0 +1,204 @@
+'use client'
+
+import { memo } from 'react'
+import type { Passenger, Station } from '../../lib/gameTypes'
+import type { Landmark } from '../../lib/landmarks'
+
+interface RailroadTrackPathProps {
+  tiesAndRails: {
+    ties: Array<{ x1: number; y1: number; x2: number; y2: number }>
+    leftRailPath: string
+    rightRailPath: string
+  } | null
+  referencePath: string
+  pathRef: React.RefObject<SVGPathElement>
+  landmarkPositions: Array<{ x: number; y: number }>
+  landmarks: Landmark[]
+  stationPositions: Array<{ x: number; y: number }>
+  stations: Station[]
+  passengers: Passenger[]
+  boardingAnimations: Map<string, unknown>
+  disembarkingAnimations: Map<string, unknown>
+}
+
+export const RailroadTrackPath = memo(
+  ({
+    tiesAndRails,
+    referencePath,
+    pathRef,
+    landmarkPositions,
+    landmarks,
+    stationPositions,
+    stations,
+    passengers,
+    boardingAnimations,
+    disembarkingAnimations,
+  }: RailroadTrackPathProps) => {
+    return (
+      <>
+        {/* Railroad ties */}
+        {tiesAndRails?.ties.map((tie, index) => (
+          <line
+            key={`tie-${index}`}
+            x1={tie.x1}
+            y1={tie.y1}
+            x2={tie.x2}
+            y2={tie.y2}
+            stroke="#654321"
+            strokeWidth="5"
+            strokeLinecap="round"
+            opacity="0.8"
+          />
+        ))}
+
+        {/* Left rail */}
+        {tiesAndRails?.leftRailPath && (
+          <path
+            d={tiesAndRails.leftRailPath}
+            fill="none"
+            stroke="#C0C0C0"
+            strokeWidth="5"
+            strokeLinecap="round"
+            strokeLinejoin="round"
+          />
+        )}
+
+        {/* Right rail */}
+        {tiesAndRails?.rightRailPath && (
+          <path
+            d={tiesAndRails.rightRailPath}
+            fill="none"
+            stroke="#C0C0C0"
+            strokeWidth="5"
+            strokeLinecap="round"
+            strokeLinejoin="round"
+          />
+        )}
+
+        {/* Reference path (invisible, used for positioning) */}
+        <path ref={pathRef} d={referencePath} fill="none" stroke="transparent" strokeWidth="2" />
+
+        {/* Landmarks - background scenery */}
+        {landmarkPositions.map((pos, index) => (
+          <text
+            key={`landmark-${index}`}
+            x={pos.x}
+            y={pos.y}
+            textAnchor="middle"
+            style={{
+              fontSize: `${(landmarks[index]?.size || 24) * 2.0}px`,
+              pointerEvents: 'none',
+              opacity: 0.7,
+              filter: 'drop-shadow(0 2px 3px rgba(0, 0, 0, 0.2))',
+            }}
+          >
+            {landmarks[index]?.emoji}
+          </text>
+        ))}
+
+        {/* Station markers */}
+        {stationPositions.map((pos, index) => {
+          const station = stations[index]
+          // Find passengers waiting at this station (exclude currently boarding)
+          const waitingPassengers = passengers.filter(
+            (p) =>
+              p.originStationId === station?.id &&
+              !p.isBoarded &&
+              !p.isDelivered &&
+              !boardingAnimations.has(p.id)
+          )
+          // Find passengers delivered at this station (exclude currently disembarking)
+          const deliveredPassengers = passengers.filter(
+            (p) =>
+              p.destinationStationId === station?.id &&
+              p.isDelivered &&
+              !disembarkingAnimations.has(p.id)
+          )
+
+          return (
+            <g key={`station-${index}`}>
+              {/* Station platform */}
+              <circle
+                cx={pos.x}
+                cy={pos.y}
+                r="18"
+                fill="#8B4513"
+                stroke="#654321"
+                strokeWidth="4"
+              />
+              {/* Station icon */}
+              <text
+                x={pos.x}
+                y={pos.y - 40}
+                textAnchor="middle"
+                fontSize="48"
+                style={{ pointerEvents: 'none' }}
+              >
+                {station?.icon}
+              </text>
+              {/* Station name */}
+              <text
+                x={pos.x}
+                y={pos.y + 50}
+                textAnchor="middle"
+                fontSize="20"
+                fill="#1f2937"
+                stroke="#f59e0b"
+                strokeWidth="0.5"
+                style={{
+                  fontWeight: 900,
+                  pointerEvents: 'none',
+                  fontFamily: '"Comic Sans MS", "Chalkboard SE", "Bradley Hand", cursive',
+                  textShadow: '0 2px 4px rgba(0, 0, 0, 0.2)',
+                  letterSpacing: '0.5px',
+                  paintOrder: 'stroke fill',
+                }}
+              >
+                {station?.name}
+              </text>
+
+              {/* Waiting passengers at this station */}
+              {waitingPassengers.map((passenger, pIndex) => (
+                <text
+                  key={`waiting-${passenger.id}`}
+                  x={pos.x + (pIndex - waitingPassengers.length / 2 + 0.5) * 28}
+                  y={pos.y - 30}
+                  textAnchor="middle"
+                  style={{
+                    fontSize: '55px',
+                    pointerEvents: 'none',
+                    filter: passenger.isUrgent
+                      ? 'drop-shadow(0 0 8px rgba(245, 158, 11, 0.8))'
+                      : 'drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3))',
+                  }}
+                >
+                  {passenger.avatar}
+                </text>
+              ))}
+
+              {/* Delivered passengers at this station (celebrating) */}
+              {deliveredPassengers.map((passenger, pIndex) => (
+                <text
+                  key={`delivered-${passenger.id}`}
+                  x={pos.x + (pIndex - deliveredPassengers.length / 2 + 0.5) * 28}
+                  y={pos.y - 30}
+                  textAnchor="middle"
+                  style={{
+                    fontSize: '55px',
+                    pointerEvents: 'none',
+                    filter: 'drop-shadow(0 0 12px rgba(16, 185, 129, 0.8))',
+                    animation: 'celebrateDelivery 2s ease-out forwards',
+                  }}
+                >
+                  {passenger.avatar}
+                </text>
+              ))}
+            </g>
+          )
+        })}
+      </>
+    )
+  }
+)
+
+RailroadTrackPath.displayName = 'RailroadTrackPath'
--- a/apps/web/src/app/arcade/complement-race/components/RaceTrack/SteamTrainJourney.tsx
+++ b/apps/web/src/app/arcade/complement-race/components/RaceTrack/SteamTrainJourney.tsx
@@ -0,0 +1,317 @@
+'use client'
+
+import { animated, useSpring } from '@react-spring/web'
+import { memo, useMemo, useRef, useState } from 'react'
+import { useGameMode } from '@/contexts/GameModeContext'
+import { useUserProfile } from '@/contexts/UserProfileContext'
+import { useComplementRace } from '../../context/ComplementRaceContext'
+import {
+  type BoardingAnimation,
+  type DisembarkingAnimation,
+  usePassengerAnimations,
+} from '../../hooks/usePassengerAnimations'
+import { useSteamJourney } from '../../hooks/useSteamJourney'
+import { useTrackManagement } from '../../hooks/useTrackManagement'
+import { useTrainTransforms } from '../../hooks/useTrainTransforms'
+import { calculateMaxConcurrentPassengers } from '../../lib/passengerGenerator'
+import { RailroadTrackGenerator } from '../../lib/RailroadTrackGenerator'
+import { getRouteTheme } from '../../lib/routeThemes'
+import { GameHUD } from './GameHUD'
+import { RailroadTrackPath } from './RailroadTrackPath'
+import { TrainAndCars } from './TrainAndCars'
+import { TrainTerrainBackground } from './TrainTerrainBackground'
+
+const BoardingPassengerAnimation = memo(({ animation }: { animation: BoardingAnimation }) => {
+  const spring = useSpring({
+    from: { x: animation.fromX, y: animation.fromY, opacity: 1 },
+    to: { x: animation.toX, y: animation.toY, opacity: 1 },
+    config: { tension: 120, friction: 14 },
+  })
+
+  return (
+    <animated.text
+      x={spring.x}
+      y={spring.y}
+      textAnchor="middle"
+      opacity={spring.opacity}
+      style={{
+        fontSize: '55px',
+        pointerEvents: 'none',
+        filter: animation.passenger.isUrgent
+          ? 'drop-shadow(0 0 8px rgba(245, 158, 11, 0.8))'
+          : 'drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3))',
+      }}
+    >
+      {animation.passenger.avatar}
+    </animated.text>
+  )
+})
+BoardingPassengerAnimation.displayName = 'BoardingPassengerAnimation'
+
+const DisembarkingPassengerAnimation = memo(
+  ({ animation }: { animation: DisembarkingAnimation }) => {
+    const spring = useSpring({
+      from: { x: animation.fromX, y: animation.fromY, opacity: 1 },
+      to: { x: animation.toX, y: animation.toY, opacity: 1 },
+      config: { tension: 120, friction: 14 },
+    })
+
+    return (
+      <animated.text
+        x={spring.x}
+        y={spring.y}
+        textAnchor="middle"
+        opacity={spring.opacity}
+        style={{
+          fontSize: '55px',
+          pointerEvents: 'none',
+          filter: 'drop-shadow(0 0 12px rgba(16, 185, 129, 0.8))',
+        }}
+      >
+        {animation.passenger.avatar}
+      </animated.text>
+    )
+  }
+)
+DisembarkingPassengerAnimation.displayName = 'DisembarkingPassengerAnimation'
+
+interface SteamTrainJourneyProps {
+  momentum: number
+  trainPosition: number
+  pressure: number
+  elapsedTime: number
+  currentQuestion: { number: number; targetSum: number; correctAnswer: number } | null
+  currentInput: string
+}
+
+export function SteamTrainJourney({
+  momentum,
+  trainPosition,
+  pressure,
+  elapsedTime,
+  currentQuestion,
+  currentInput,
+}: SteamTrainJourneyProps) {
+  const { state } = useComplementRace()
+  const { getSkyGradient, getTimeOfDayPeriod } = useSteamJourney()
+  const _skyGradient = getSkyGradient()
+  const period = getTimeOfDayPeriod()
+  const { players } = useGameMode()
+  const { profile: _profile } = useUserProfile()
+
+  // Get the first active player's emoji
+  const activePlayers = Array.from(players.values()).filter((p) => p.id)
+  const firstActivePlayer = activePlayers[0]
+  const playerEmoji = firstActivePlayer?.emoji ?? '👤'
+
+  const svgRef = useRef<SVGSVGElement>(null)
+  const pathRef = useRef<SVGPathElement>(null)
+  const [trackGenerator] = useState(() => new RailroadTrackGenerator(800, 600))
+
+  // Calculate the number of train cars dynamically based on max concurrent passengers
+  const maxCars = useMemo(() => {
+    const maxPassengers = calculateMaxConcurrentPassengers(state.passengers, state.stations)
+    // Ensure at least 1 car, even if no passengers
+    return Math.max(1, maxPassengers)
+  }, [state.passengers, state.stations])
+
+  const carSpacing = 7 // Distance between cars (in % of track)
+
+  // Train transforms (extracted to hook)
+  const { trainTransform, trainCars, locomotiveOpacity } = useTrainTransforms({
+    trainPosition,
+    trackGenerator,
+    pathRef,
+    maxCars,
+    carSpacing,
+  })
+
+  // Track management (extracted to hook)
+  const {
+    trackData,
+    tiesAndRails,
+    stationPositions,
+    landmarks,
+    landmarkPositions,
+    displayPassengers,
+  } = useTrackManagement({
+    currentRoute: state.currentRoute,
+    trainPosition,
+    trackGenerator,
+    pathRef,
+    stations: state.stations,
+    passengers: state.passengers,
+    maxCars,
+    carSpacing,
+  })
+
+  // Passenger animations (extracted to hook)
+  const { boardingAnimations, disembarkingAnimations } = usePassengerAnimations({
+    passengers: state.passengers,
+    stations: state.stations,
+    stationPositions,
+    trainPosition,
+    trackGenerator,
+    pathRef,
+  })
+
+  // Time remaining (60 seconds total)
+  const timeRemaining = Math.max(0, 60 - Math.floor(elapsedTime / 1000))
+
+  // Period names for display
+  const periodNames = ['Dawn', 'Morning', 'Midday', 'Afternoon', 'Dusk', 'Night']
+
+  // Get current route theme
+  const routeTheme = getRouteTheme(state.currentRoute)
+
+  // Memoize filtered passenger lists to avoid recalculating on every render
+  const boardedPassengers = useMemo(
+    () => displayPassengers.filter((p) => p.isBoarded && !p.isDelivered),
+    [displayPassengers]
+  )
+
+  const nonDeliveredPassengers = useMemo(
+    () => displayPassengers.filter((p) => !p.isDelivered),
+    [displayPassengers]
+  )
+
+  // Memoize ground texture circles to avoid recreating on every render
+  const groundTextureCircles = useMemo(
+    () =>
+      Array.from({ length: 30 }).map((_, i) => ({
+        key: `ground-texture-${i}`,
+        cx: -30 + i * 28 + (i % 3) * 10,
+        cy: 140 + (i % 5) * 60,
+        r: 2 + (i % 3),
+      })),
+    []
+  )
+
+  if (!trackData) return null
+
+  return (
+    <div
+      data-component="steam-train-journey"
+      style={{
+        position: 'relative',
+        width: '100%',
+        height: '100%',
+        background: 'transparent',
+        overflow: 'visible',
+        display: 'flex',
+        alignItems: 'center',
+        justifyContent: 'stretch',
+      }}
+    >
+      {/* Game HUD - overlays and UI elements */}
+      <GameHUD
+        routeTheme={routeTheme}
+        currentRoute={state.currentRoute}
+        periodName={periodNames[period]}
+        timeRemaining={timeRemaining}
+        pressure={pressure}
+        nonDeliveredPassengers={nonDeliveredPassengers}
+        stations={state.stations}
+        currentQuestion={currentQuestion}
+        currentInput={currentInput}
+      />
+
+      {/* Railroad track SVG */}
+      <svg
+        data-component="railroad-track"
+        ref={svgRef}
+        viewBox="-50 -50 900 700"
+        style={{
+          width: '100%',
+          height: 'auto',
+          aspectRatio: '800 / 600',
+          overflow: 'visible',
+        }}
+      >
+        {/* Terrain background - ground, mountains, and tunnels */}
+        <TrainTerrainBackground
+          ballastPath={trackData.ballastPath}
+          groundTextureCircles={groundTextureCircles}
+        />
+
+        {/* Railroad track, landmarks, and stations */}
+        <RailroadTrackPath
+          tiesAndRails={tiesAndRails}
+          referencePath={trackData.referencePath}
+          pathRef={pathRef}
+          landmarkPositions={landmarkPositions}
+          landmarks={landmarks}
+          stationPositions={stationPositions}
+          stations={state.stations}
+          passengers={displayPassengers}
+          boardingAnimations={boardingAnimations}
+          disembarkingAnimations={disembarkingAnimations}
+        />
+
+        {/* Train, cars, and passenger animations */}
+        <TrainAndCars
+          boardingAnimations={boardingAnimations}
+          disembarkingAnimations={disembarkingAnimations}
+          BoardingPassengerAnimation={BoardingPassengerAnimation}
+          DisembarkingPassengerAnimation={DisembarkingPassengerAnimation}
+          trainCars={trainCars}
+          boardedPassengers={boardedPassengers}
+          trainTransform={trainTransform}
+          locomotiveOpacity={locomotiveOpacity}
+          playerEmoji={playerEmoji}
+          momentum={momentum}
+        />
+      </svg>
+
+      {/* CSS animations */}
+      <style>{`
+        @keyframes steamPuffSVG {
+          0% {
+            opacity: 0.8;
+            transform: scale(0.5) translate(0, 0);
+          }
+          50% {
+            opacity: 0.4;
+            transform: scale(1.5) translate(15px, -30px);
+          }
+          100% {
+            opacity: 0;
+            transform: scale(2) translate(25px, -60px);
+          }
+        }
+
+        @keyframes coalFallingSVG {
+          0% {
+            opacity: 1;
+            transform: translate(0, 0) scale(1);
+          }
+          50% {
+            opacity: 0.7;
+            transform: translate(5px, 15px) scale(0.8);
+          }
+          100% {
+            opacity: 0;
+            transform: translate(8px, 30px) scale(0.5);
+          }
+        }
+
+        @keyframes celebrateDelivery {
+          0% {
+            opacity: 1;
+            transform: scale(1) translateY(0);
+          }
+          20% {
+            transform: scale(1.3) translateY(-10px);
+          }
+          40% {
+            transform: scale(1.2) translateY(-5px);
+          }
+          100% {
+            opacity: 0;
+            transform: scale(0.8) translateY(-20px);
+          }
+        }
+      `}</style>
+    </div>
+  )
+}
--- a/apps/web/src/app/arcade/complement-race/components/RaceTrack/TrainAndCars.tsx
+++ b/apps/web/src/app/arcade/complement-race/components/RaceTrack/TrainAndCars.tsx
@@ -0,0 +1,196 @@
+'use client'
+
+import { memo } from 'react'
+import type { BoardingAnimation, DisembarkingAnimation } from '../../hooks/usePassengerAnimations'
+import type { Passenger } from '../../lib/gameTypes'
+
+interface TrainCarTransform {
+  x: number
+  y: number
+  rotation: number
+  position: number
+  opacity: number
+}
+
+interface TrainTransform {
+  x: number
+  y: number
+  rotation: number
+}
+
+interface TrainAndCarsProps {
+  boardingAnimations: Map<string, BoardingAnimation>
+  disembarkingAnimations: Map<string, DisembarkingAnimation>
+  BoardingPassengerAnimation: React.ComponentType<{ animation: BoardingAnimation }>
+  DisembarkingPassengerAnimation: React.ComponentType<{ animation: DisembarkingAnimation }>
+  trainCars: TrainCarTransform[]
+  boardedPassengers: Passenger[]
+  trainTransform: TrainTransform
+  locomotiveOpacity: number
+  playerEmoji: string
+  momentum: number
+}
+
+export const TrainAndCars = memo(
+  ({
+    boardingAnimations,
+    disembarkingAnimations,
+    BoardingPassengerAnimation,
+    DisembarkingPassengerAnimation,
+    trainCars,
+    boardedPassengers,
+    trainTransform,
+    locomotiveOpacity,
+    playerEmoji,
+    momentum,
+  }: TrainAndCarsProps) => {
+    return (
+      <>
+        {/* Boarding animations - passengers moving from station to train car */}
+        {Array.from(boardingAnimations.values()).map((animation) => (
+          <BoardingPassengerAnimation
+            key={`boarding-${animation.passenger.id}`}
+            animation={animation}
+          />
+        ))}
+
+        {/* Disembarking animations - passengers moving from train car to station */}
+        {Array.from(disembarkingAnimations.values()).map((animation) => (
+          <DisembarkingPassengerAnimation
+            key={`disembarking-${animation.passenger.id}`}
+            animation={animation}
+          />
+        ))}
+
+        {/* Train cars - render in reverse order so locomotive appears on top */}
+        {trainCars.map((carTransform, carIndex) => {
+          // Assign passenger to this car (if one exists for this car index)
+          const passenger = boardedPassengers[carIndex]
+
+          return (
+            <g
+              key={`train-car-${carIndex}`}
+              data-component="train-car"
+              transform={`translate(${carTransform.x}, ${carTransform.y}) rotate(${carTransform.rotation}) scale(-1, 1)`}
+              opacity={carTransform.opacity}
+              style={{
+                transition: 'opacity 0.5s ease-in',
+              }}
+            >
+              {/* Train car */}
+              <text
+                data-element="train-car-body"
+                x={0}
+                y={0}
+                textAnchor="middle"
+                style={{
+                  fontSize: '65px',
+                  filter: 'drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3))',
+                  pointerEvents: 'none',
+                }}
+              >
+                🚃
+              </text>
+
+              {/* Passenger inside this car (hide if currently boarding) */}
+              {passenger && !boardingAnimations.has(passenger.id) && (
+                <text
+                  data-element="car-passenger"
+                  x={0}
+                  y={0}
+                  textAnchor="middle"
+                  style={{
+                    fontSize: '42px',
+                    filter: passenger.isUrgent
+                      ? 'drop-shadow(0 0 6px rgba(245, 158, 11, 0.8))'
+                      : 'drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3))',
+                    pointerEvents: 'none',
+                  }}
+                >
+                  {passenger.avatar}
+                </text>
+              )}
+            </g>
+          )
+        })}
+
+        {/* Locomotive - rendered last so it appears on top */}
+        <g
+          data-component="locomotive-group"
+          transform={`translate(${trainTransform.x}, ${trainTransform.y}) rotate(${trainTransform.rotation}) scale(-1, 1)`}
+          opacity={locomotiveOpacity}
+          style={{
+            transition: 'opacity 0.5s ease-in',
+          }}
+        >
+          {/* Train locomotive */}
+          <text
+            data-element="train-locomotive"
+            x={0}
+            y={0}
+            textAnchor="middle"
+            style={{
+              fontSize: '100px',
+              filter: 'drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3))',
+              pointerEvents: 'none',
+            }}
+          >
+            🚂
+          </text>
+
+          {/* Player engineer - layered over the train */}
+          <text
+            data-element="player-engineer"
+            x={45}
+            y={0}
+            textAnchor="middle"
+            style={{
+              fontSize: '70px',
+              filter: 'drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3))',
+              pointerEvents: 'none',
+            }}
+          >
+            {playerEmoji}
+          </text>
+
+          {/* Steam puffs - positioned at smokestack, layered over train */}
+          {momentum > 10 &&
+            [0, 0.6, 1.2].map((delay, i) => (
+              <circle
+                key={`steam-${i}`}
+                cx={-35}
+                cy={-35}
+                r="10"
+                fill="rgba(255, 255, 255, 0.6)"
+                style={{
+                  filter: 'blur(4px)',
+                  animation: `steamPuffSVG 2s ease-out infinite`,
+                  animationDelay: `${delay}s`,
+                  pointerEvents: 'none',
+                }}
+              />
+            ))}
+
+          {/* Coal particles - animated when shoveling */}
+          {momentum > 60 &&
+            [0, 0.3, 0.6].map((delay, i) => (
+              <circle
+                key={`coal-${i}`}
+                cx={25}
+                cy={0}
+                r="3"
+                fill="#2c2c2c"
+                style={{
+                  animation: 'coalFallingSVG 1.2s ease-out infinite',
+                  animationDelay: `${delay}s`,
+                  pointerEvents: 'none',
+                }}
+              />
+            ))}
+        </g>
+      </>
+    )
+  }
+)
+
+TrainAndCars.displayName = 'TrainAndCars'
--- a/apps/web/src/app/arcade/complement-race/components/RaceTrack/TrainTerrainBackground.tsx
+++ b/apps/web/src/app/arcade/complement-race/components/RaceTrack/TrainTerrainBackground.tsx
@@ -0,0 +1,144 @@
+'use client'
+
+import { memo } from 'react'
+
+interface TrainTerrainBackgroundProps {
+  ballastPath: string
+  groundTextureCircles: Array<{
+    key: string
+    cx: number
+    cy: number
+    r: number
+  }>
+}
+
+export const TrainTerrainBackground = memo(
+  ({ ballastPath, groundTextureCircles }: TrainTerrainBackgroundProps) => {
+    return (
+      <>
+        {/* Gradient definitions for mountain shading and ground */}
+        <defs>
+          <linearGradient id="mountainGradientLeft" x1="0%" y1="0%" x2="100%" y2="100%">
+            <stop offset="0%" style={{ stopColor: '#a0a0a0', stopOpacity: 0.8 }} />
+            <stop offset="50%" style={{ stopColor: '#7a7a7a', stopOpacity: 0.6 }} />
+            <stop offset="100%" style={{ stopColor: '#5a5a5a', stopOpacity: 0.4 }} />
+          </linearGradient>
+          <linearGradient id="mountainGradientRight" x1="0%" y1="0%" x2="100%" y2="100%">
+            <stop offset="0%" style={{ stopColor: '#5a5a5a', stopOpacity: 0.4 }} />
+            <stop offset="50%" style={{ stopColor: '#7a7a7a', stopOpacity: 0.6 }} />
+            <stop offset="100%" style={{ stopColor: '#a0a0a0', stopOpacity: 0.8 }} />
+          </linearGradient>
+          <linearGradient id="groundGradient" x1="0%" y1="0%" x2="0%" y2="100%">
+            <stop offset="0%" style={{ stopColor: '#6a8759', stopOpacity: 0.3 }} />
+            <stop offset="100%" style={{ stopColor: '#8B7355', stopOpacity: 0 }} />
+          </linearGradient>
+        </defs>
+
+        {/* Ground layer - extends full width and height to cover entire track area */}
+        <rect x="-50" y="120" width="900" height="530" fill="#8B7355" />
+
+        {/* Ground surface gradient for depth */}
+        <rect x="-50" y="120" width="900" height="60" fill="url(#groundGradient)" />
+
+        {/* Ground texture - scattered rocks/pebbles */}
+        {groundTextureCircles.map((circle) => (
+          <circle
+            key={circle.key}
+            cx={circle.cx}
+            cy={circle.cy}
+            r={circle.r}
+            fill="#654321"
+            opacity={0.3}
+          />
+        ))}
+
+        {/* Railroad ballast (gravel bed) */}
+        <path d={ballastPath} fill="none" stroke="#8B7355" strokeWidth="40" strokeLinecap="round" />
+
+        {/* Left mountain and tunnel */}
+        <g data-element="left-tunnel">
+          {/* Mountain base - extends from left edge */}
+          <rect x="-50" y="200" width="120" height="450" fill="#6b7280" />
+
+          {/* Mountain peak - triangular slope */}
+          <path d="M -50 200 L 70 200 L 20 -50 L -50 100 Z" fill="#8b8b8b" />
+
+          {/* Mountain ridge shading */}
+          <path d="M -50 200 L 70 200 L 20 -50 Z" fill="url(#mountainGradientLeft)" />
+
+          {/* Tunnel depth/interior (dark entrance) */}
+          <ellipse cx="20" cy="300" rx="50" ry="55" fill="#0a0a0a" />
+
+          {/* Tunnel arch opening */}
+          <path
+            d="M 20 355 L -50 355 L -50 245 Q -50 235, 20 235 Q 70 235, 70 245 L 70 355 Z"
+            fill="#1a1a1a"
+            stroke="#4a4a4a"
+            strokeWidth="3"
+          />
+
+          {/* Tunnel arch rim (stone bricks) */}
+          <path
+            d="M -50 245 Q -50 235, 20 235 Q 70 235, 70 245"
+            fill="none"
+            stroke="#8b7355"
+            strokeWidth="8"
+            strokeLinecap="round"
+          />
+
+          {/* Stone brick texture around arch */}
+          <path
+            d="M -50 245 Q -50 235, 20 235 Q 70 235, 70 245"
+            fill="none"
+            stroke="#654321"
+            strokeWidth="2"
+            strokeDasharray="15,10"
+          />
+        </g>
+
+        {/* Right mountain and tunnel */}
+        <g data-element="right-tunnel">
+          {/* Mountain base - extends to right edge */}
+          <rect x="680" y="200" width="170" height="450" fill="#6b7280" />
+
+          {/* Mountain peak - triangular slope */}
+          <path d="M 730 200 L 850 200 L 850 100 L 780 -50 Z" fill="#8b8b8b" />
+
+          {/* Mountain ridge shading */}
+          <path d="M 730 200 L 850 150 L 780 -50 Z" fill="url(#mountainGradientRight)" />
+
+          {/* Tunnel depth/interior (dark entrance) */}
+          <ellipse cx="780" cy="300" rx="50" ry="55" fill="#0a0a0a" />
+
+          {/* Tunnel arch opening */}
+          <path
+            d="M 780 355 L 730 355 L 730 245 Q 730 235, 780 235 Q 850 235, 850 245 L 850 355 Z"
+            fill="#1a1a1a"
+            stroke="#4a4a4a"
+            strokeWidth="3"
+          />
+
+          {/* Tunnel arch rim (stone bricks) */}
+          <path
+            d="M 730 245 Q 730 235, 780 235 Q 850 235, 850 245"
+            fill="none"
+            stroke="#8b7355"
+            strokeWidth="8"
+            strokeLinecap="round"
+          />
+
+          {/* Stone brick texture around arch */}
+          <path
+            d="M 730 245 Q 730 235, 780 235 Q 850 235, 850 245"
+            fill="none"
+            stroke="#654321"
+            strokeWidth="2"
+            strokeDasharray="15,10"
+          />
+        </g>
+      </>
+    )
+  }
+)
+
+TrainTerrainBackground.displayName = 'TrainTerrainBackground'
--- a/apps/web/src/app/arcade/complement-race/components/RaceTrack/tests/GameHUD.test.tsx
+++ b/apps/web/src/app/arcade/complement-race/components/RaceTrack/tests/GameHUD.test.tsx
@@ -0,0 +1,165 @@
+import { render, screen } from '@testing-library/react'
+import { describe, expect, test, vi } from 'vitest'
+import type { Passenger, Station } from '../../../lib/gameTypes'
+import { GameHUD } from '../GameHUD'
+
+// Mock child components
+vi.mock('../../PassengerCard', () => ({
+  PassengerCard: ({ passenger }: { passenger: Passenger }) => (
+    <div data-testid="passenger-card">{passenger.avatar}</div>
+  ),
+}))
+
+vi.mock('../../PressureGauge', () => ({
+  PressureGauge: ({ pressure }: { pressure: number }) => (
+    <div data-testid="pressure-gauge">{pressure}</div>
+  ),
+}))
+
+describe('GameHUD', () => {
+  const mockRouteTheme = {
+    emoji: '🚂',
+    name: 'Mountain Pass',
+  }
+
+  const mockStations: Station[] = [
+    { id: 'station-1', name: 'Station 1', position: 20, icon: '🏭' },
+    { id: 'station-2', name: 'Station 2', position: 60, icon: '🏛️' },
+  ]
+
+  const mockPassenger: Passenger = {
+    id: 'passenger-1',
+    avatar: '👨',
+    originStationId: 'station-1',
+    destinationStationId: 'station-2',
+    isBoarded: false,
+    isDelivered: false,
+    isUrgent: false,
+  }
+
+  const defaultProps = {
+    routeTheme: mockRouteTheme,
+    currentRoute: 1,
+    periodName: '🌅 Dawn',
+    timeRemaining: 45,
+    pressure: 75,
+    nonDeliveredPassengers: [],
+    stations: mockStations,
+    currentQuestion: {
+      number: 3,
+      targetSum: 10,
+      correctAnswer: 7,
+    },
+    currentInput: '7',
+  }
+
+  test('renders route information', () => {
+    render(<GameHUD {...defaultProps} />)
+
+    expect(screen.getByText('Route 1')).toBeInTheDocument()
+    expect(screen.getByText('Mountain Pass')).toBeInTheDocument()
+    expect(screen.getByText('🚂')).toBeInTheDocument()
+  })
+
+  test('renders time of day period', () => {
+    render(<GameHUD {...defaultProps} />)
+
+    expect(screen.getByText('🌅 Dawn')).toBeInTheDocument()
+  })
+
+  test('renders time remaining', () => {
+    render(<GameHUD {...defaultProps} />)
+
+    expect(screen.getByText(/45s/)).toBeInTheDocument()
+  })
+
+  test('renders pressure gauge', () => {
+    render(<GameHUD {...defaultProps} />)
+
+    expect(screen.getByTestId('pressure-gauge')).toBeInTheDocument()
+    expect(screen.getByText('75')).toBeInTheDocument()
+  })
+
+  test('renders passenger list when passengers exist', () => {
+    render(<GameHUD {...defaultProps} nonDeliveredPassengers={[mockPassenger]} />)
+
+    expect(screen.getByTestId('passenger-card')).toBeInTheDocument()
+    expect(screen.getByText('👨')).toBeInTheDocument()
+  })
+
+  test('does not render passenger list when empty', () => {
+    render(<GameHUD {...defaultProps} nonDeliveredPassengers={[]} />)
+
+    expect(screen.queryByTestId('passenger-card')).not.toBeInTheDocument()
+  })
+
+  test('renders current question when provided', () => {
+    render(<GameHUD {...defaultProps} />)
+
+    expect(screen.getByText('7')).toBeInTheDocument() // currentInput
+    expect(screen.getByText('3')).toBeInTheDocument() // question.number
+    expect(screen.getByText('10')).toBeInTheDocument() // targetSum
+    expect(screen.getByText('+')).toBeInTheDocument()
+    expect(screen.getByText('=')).toBeInTheDocument()
+  })
+
+  test('shows question mark when no input', () => {
+    render(<GameHUD {...defaultProps} currentInput="" />)
+
+    expect(screen.getByText('?')).toBeInTheDocument()
+  })
+
+  test('does not render question display when currentQuestion is null', () => {
+    render(<GameHUD {...defaultProps} currentQuestion={null} />)
+
+    expect(screen.queryByText('+')).not.toBeInTheDocument()
+    expect(screen.queryByText('=')).not.toBeInTheDocument()
+  })
+
+  test('renders multiple passengers', () => {
+    const passengers = [
+      mockPassenger,
+      { ...mockPassenger, id: 'passenger-2', avatar: '👩' },
+      { ...mockPassenger, id: 'passenger-3', avatar: '👧' },
+    ]
+
+    render(<GameHUD {...defaultProps} nonDeliveredPassengers={passengers} />)
+
+    expect(screen.getAllByTestId('passenger-card')).toHaveLength(3)
+    expect(screen.getByText('👨')).toBeInTheDocument()
+    expect(screen.getByText('👩')).toBeInTheDocument()
+    expect(screen.getByText('👧')).toBeInTheDocument()
+  })
+
+  test('updates when route changes', () => {
+    const { rerender } = render(<GameHUD {...defaultProps} />)
+
+    expect(screen.getByText('Route 1')).toBeInTheDocument()
+
+    rerender(<GameHUD {...defaultProps} currentRoute={2} />)
+
+    expect(screen.getByText('Route 2')).toBeInTheDocument()
+  })
+
+  test('updates when time remaining changes', () => {
+    const { rerender } = render(<GameHUD {...defaultProps} />)
+
+    expect(screen.getByText(/45s/)).toBeInTheDocument()
+
+    rerender(<GameHUD {...defaultProps} timeRemaining={30} />)
+
+    expect(screen.getByText(/30s/)).toBeInTheDocument()
+  })
+
+  test('memoization: same props do not cause re-render', () => {
+    const { rerender, container } = render(<GameHUD {...defaultProps} />)
+
+    const initialHTML = container.innerHTML
+
+    // Rerender with same props
+    rerender(<GameHUD {...defaultProps} />)
+
+    // Should be memoized (same HTML)
+    expect(container.innerHTML).toBe(initialHTML)
+  })
+})
--- a/apps/web/src/app/arcade/complement-race/components/RaceTrack/tests/TrainTerrainBackground.test.tsx
+++ b/apps/web/src/app/arcade/complement-race/components/RaceTrack/tests/TrainTerrainBackground.test.tsx
@@ -0,0 +1,191 @@
+import { render } from '@testing-library/react'
+import { describe, expect, test } from 'vitest'
+import { TrainTerrainBackground } from '../TrainTerrainBackground'
+
+describe('TrainTerrainBackground', () => {
+  const mockGroundCircles = [
+    { key: 'ground-1', cx: 10, cy: 150, r: 2 },
+    { key: 'ground-2', cx: 40, cy: 180, r: 3 },
+  ]
+
+  test('renders without crashing', () => {
+    const { container } = render(
+      <svg>
+        <TrainTerrainBackground
+          ballastPath="M 0 300 L 800 300"
+          groundTextureCircles={mockGroundCircles}
+        />
+      </svg>
+    )
+
+    expect(container).toBeTruthy()
+  })
+
+  test('renders gradient definitions', () => {
+    const { container } = render(
+      <svg>
+        <TrainTerrainBackground
+          ballastPath="M 0 300 L 800 300"
+          groundTextureCircles={mockGroundCircles}
+        />
+      </svg>
+    )
+
+    const defs = container.querySelector('defs')
+    expect(defs).toBeTruthy()
+
+    // Check for gradient IDs
+    expect(container.querySelector('#mountainGradientLeft')).toBeTruthy()
+    expect(container.querySelector('#mountainGradientRight')).toBeTruthy()
+    expect(container.querySelector('#groundGradient')).toBeTruthy()
+  })
+
+  test('renders ground layer rects', () => {
+    const { container } = render(
+      <svg>
+        <TrainTerrainBackground
+          ballastPath="M 0 300 L 800 300"
+          groundTextureCircles={mockGroundCircles}
+        />
+      </svg>
+    )
+
+    const rects = container.querySelectorAll('rect')
+    expect(rects.length).toBeGreaterThan(0)
+
+    // Check for ground base layer
+    const groundRect = Array.from(rects).find(
+      (rect) => rect.getAttribute('fill') === '#8B7355' && rect.getAttribute('width') === '900'
+    )
+    expect(groundRect).toBeTruthy()
+  })
+
+  test('renders ground texture circles', () => {
+    const { container } = render(
+      <svg>
+        <TrainTerrainBackground
+          ballastPath="M 0 300 L 800 300"
+          groundTextureCircles={mockGroundCircles}
+        />
+      </svg>
+    )
+
+    const circles = container.querySelectorAll('circle')
+    expect(circles.length).toBeGreaterThanOrEqual(2)
+
+    // Verify circle attributes
+    const firstCircle = circles[0]
+    expect(firstCircle.getAttribute('cx')).toBe('10')
+    expect(firstCircle.getAttribute('cy')).toBe('150')
+    expect(firstCircle.getAttribute('r')).toBe('2')
+  })
+
+  test('renders ballast path with correct attributes', () => {
+    const { container } = render(
+      <svg>
+        <TrainTerrainBackground
+          ballastPath="M 0 300 L 800 300"
+          groundTextureCircles={mockGroundCircles}
+        />
+      </svg>
+    )
+
+    const ballastPath = Array.from(container.querySelectorAll('path')).find(
+      (path) =>
+        path.getAttribute('d') === 'M 0 300 L 800 300' && path.getAttribute('stroke') === '#8B7355'
+    )
+    expect(ballastPath).toBeTruthy()
+    expect(ballastPath?.getAttribute('stroke-width')).toBe('40')
+  })
+
+  test('renders left tunnel structure', () => {
+    const { container } = render(
+      <svg>
+        <TrainTerrainBackground
+          ballastPath="M 0 300 L 800 300"
+          groundTextureCircles={mockGroundCircles}
+        />
+      </svg>
+    )
+
+    const leftTunnel = container.querySelector('[data-element="left-tunnel"]')
+    expect(leftTunnel).toBeTruthy()
+
+    // Check for tunnel elements
+    const ellipses = leftTunnel?.querySelectorAll('ellipse')
+    expect(ellipses?.length).toBeGreaterThan(0)
+  })
+
+  test('renders right tunnel structure', () => {
+    const { container } = render(
+      <svg>
+        <TrainTerrainBackground
+          ballastPath="M 0 300 L 800 300"
+          groundTextureCircles={mockGroundCircles}
+        />
+      </svg>
+    )
+
+    const rightTunnel = container.querySelector('[data-element="right-tunnel"]')
+    expect(rightTunnel).toBeTruthy()
+
+    // Check for tunnel elements
+    const ellipses = rightTunnel?.querySelectorAll('ellipse')
+    expect(ellipses?.length).toBeGreaterThan(0)
+  })
+
+  test('renders mountains with gradient fills', () => {
+    const { container } = render(
+      <svg>
+        <TrainTerrainBackground
+          ballastPath="M 0 300 L 800 300"
+          groundTextureCircles={mockGroundCircles}
+        />
+      </svg>
+    )
+
+    // Check for paths with gradient fills
+    const gradientPaths = Array.from(container.querySelectorAll('path')).filter((path) =>
+      path.getAttribute('fill')?.includes('url(#mountainGradient')
+    )
+    expect(gradientPaths.length).toBeGreaterThanOrEqual(2)
+  })
+
+  test('handles empty groundTextureCircles array', () => {
+    const { container } = render(
+      <svg>
+        <TrainTerrainBackground ballastPath="M 0 300 L 800 300" groundTextureCircles={[]} />
+      </svg>
+    )
+
+    // Should still render other elements
+    expect(container.querySelector('defs')).toBeTruthy()
+    expect(container.querySelector('[data-element="left-tunnel"]')).toBeTruthy()
+  })
+
+  test('memoization: does not re-render with same props', () => {
+    const { rerender, container } = render(
+      <svg>
+        <TrainTerrainBackground
+          ballastPath="M 0 300 L 800 300"
+          groundTextureCircles={mockGroundCircles}
+        />
+      </svg>
+    )
+
+    const initialHTML = container.innerHTML
+
+    // Rerender with same props
+    rerender(
+      <svg>
+        <TrainTerrainBackground
+          ballastPath="M 0 300 L 800 300"
+          groundTextureCircles={mockGroundCircles}
+        />
+      </svg>
+    )
+
+    // HTML should be identical (component memoized)
+    expect(container.innerHTML).toBe(initialHTML)
+  })
+})
--- a/apps/web/src/app/arcade/complement-race/components/RouteCelebration.tsx
+++ b/apps/web/src/app/arcade/complement-race/components/RouteCelebration.tsx
@@ -0,0 +1,171 @@
+'use client'
+
+import { getRouteTheme } from '../lib/routeThemes'
+
+interface RouteCelebrationProps {
+  completedRouteNumber: number
+  nextRouteNumber: number
+  onContinue: () => void
+}
+
+export function RouteCelebration({
+  completedRouteNumber,
+  nextRouteNumber,
+  onContinue,
+}: RouteCelebrationProps) {
+  const completedTheme = getRouteTheme(completedRouteNumber)
+  const nextTheme = getRouteTheme(nextRouteNumber)
+
+  return (
+    <div
+      style={{
+        position: 'fixed',
+        top: 0,
+        left: 0,
+        right: 0,
+        bottom: 0,
+        background: 'rgba(0, 0, 0, 0.7)',
+        display: 'flex',
+        alignItems: 'center',
+        justifyContent: 'center',
+        zIndex: 9999,
+        animation: 'fadeIn 0.3s ease-out',
+      }}
+    >
+      <div
+        style={{
+          background: 'linear-gradient(135deg, #667eea 0%, #764ba2 100%)',
+          borderRadius: '24px',
+          padding: '40px',
+          maxWidth: '500px',
+          textAlign: 'center',
+          boxShadow: '0 20px 60px rgba(0, 0, 0, 0.5)',
+          animation: 'scaleIn 0.5s ease-out',
+          color: 'white',
+        }}
+      >
+        {/* Celebration header */}
+        <div
+          style={{
+            fontSize: '64px',
+            marginBottom: '20px',
+            animation: 'bounce 1s ease-in-out infinite',
+          }}
+        >
+          🎉
+        </div>
+
+        <h2
+          style={{
+            fontSize: '32px',
+            fontWeight: 'bold',
+            marginBottom: '16px',
+            textShadow: '0 2px 10px rgba(0, 0, 0, 0.3)',
+          }}
+        >
+          Route Complete!
+        </h2>
+
+        {/* Completed route info */}
+        <div
+          style={{
+            background: 'rgba(255, 255, 255, 0.2)',
+            borderRadius: '12px',
+            padding: '16px',
+            marginBottom: '24px',
+          }}
+        >
+          <div style={{ fontSize: '40px', marginBottom: '8px' }}>{completedTheme.emoji}</div>
+          <div style={{ fontSize: '20px', fontWeight: '600' }}>{completedTheme.name}</div>
+          <div style={{ fontSize: '16px', opacity: 0.9, marginTop: '4px' }}>
+            Route {completedRouteNumber}
+          </div>
+        </div>
+
+        {/* Next route preview */}
+        <div
+          style={{
+            fontSize: '14px',
+            opacity: 0.9,
+            marginBottom: '8px',
+          }}
+        >
+          Next destination:
+        </div>
+        <div
+          style={{
+            background: 'rgba(255, 255, 255, 0.15)',
+            borderRadius: '12px',
+            padding: '12px',
+            marginBottom: '24px',
+            border: '2px dashed rgba(255, 255, 255, 0.3)',
+          }}
+        >
+          <div style={{ fontSize: '32px', marginBottom: '4px' }}>{nextTheme.emoji}</div>
+          <div style={{ fontSize: '18px', fontWeight: '600' }}>{nextTheme.name}</div>
+          <div style={{ fontSize: '14px', opacity: 0.8, marginTop: '4px' }}>
+            Route {nextRouteNumber}
+          </div>
+        </div>
+
+        {/* Continue button */}
+        <button
+          onClick={onContinue}
+          style={{
+            background: 'white',
+            color: '#667eea',
+            border: 'none',
+            borderRadius: '12px',
+            padding: '16px 32px',
+            fontSize: '18px',
+            fontWeight: 'bold',
+            cursor: 'pointer',
+            boxShadow: '0 4px 12px rgba(0, 0, 0, 0.2)',
+            transition: 'transform 0.2s ease, box-shadow 0.2s ease',
+          }}
+          onMouseEnter={(e) => {
+            e.currentTarget.style.transform = 'translateY(-2px)'
+            e.currentTarget.style.boxShadow = '0 6px 16px rgba(0, 0, 0, 0.3)'
+          }}
+          onMouseLeave={(e) => {
+            e.currentTarget.style.transform = 'translateY(0)'
+            e.currentTarget.style.boxShadow = '0 4px 12px rgba(0, 0, 0, 0.2)'
+          }}
+        >
+          Continue Journey 🚂
+        </button>
+      </div>
+
+      <style>{`
+        @keyframes fadeIn {
+          from {
+            opacity: 0;
+          }
+          to {
+            opacity: 1;
+          }
+        }
+
+        @keyframes scaleIn {
+          from {
+            transform: scale(0.8);
+            opacity: 0;
+          }
+          to {
+            transform: scale(1);
+            opacity: 1;
+          }
+        }
+
+        @keyframes bounce {
+          0%, 100% {
+            transform: translateY(0);
+          }
+          50% {
+            transform: translateY(-10px);
+          }
+        }
+      `}</style>
+    </div>
+  )
+}
--- a/apps/web/src/app/arcade/complement-race/context/ComplementRaceContext.tsx
+++ b/apps/web/src/app/arcade/complement-race/context/ComplementRaceContext.tsx
@@ -0,0 +1,455 @@
+'use client'
+
+import type React from 'react'
+import { createContext, type ReactNode, useContext, useReducer } from 'react'
+import type { AIRacer, DifficultyTracker, GameAction, GameState, Station } from '../lib/gameTypes'
+
+const initialDifficultyTracker: DifficultyTracker = {
+  pairPerformance: new Map(),
+  baseTimeLimit: 3000,
+  currentTimeLimit: 3000,
+  difficultyLevel: 1,
+  consecutiveCorrect: 0,
+  consecutiveIncorrect: 0,
+  learningMode: true,
+  adaptationRate: 0.1,
+}
+
+const initialAIRacers: AIRacer[] = [
+  {
+    id: 'ai-racer-1',
+    position: 0,
+    speed: 0.32, // Balanced speed for good challenge
+    name: 'Swift AI',
+    personality: 'competitive',
+    icon: '🏃‍♂️',
+    lastComment: 0,
+    commentCooldown: 0,
+    previousPosition: 0,
+  },
+  {
+    id: 'ai-racer-2',
+    position: 0,
+    speed: 0.2, // Balanced speed for good challenge
+    name: 'Math Bot',
+    personality: 'analytical',
+    icon: '🏃',
+    lastComment: 0,
+    commentCooldown: 0,
+    previousPosition: 0,
+  },
+]
+
+const initialStations: Station[] = [
+  { id: 'station-0', name: 'Depot', position: 0, icon: '🏭' },
+  { id: 'station-1', name: 'Riverside', position: 20, icon: '🌊' },
+  { id: 'station-2', name: 'Hillside', position: 40, icon: '⛰️' },
+  { id: 'station-3', name: 'Canyon View', position: 60, icon: '🏜️' },
+  { id: 'station-4', name: 'Meadows', position: 80, icon: '🌾' },
+  { id: 'station-5', name: 'Grand Central', position: 100, icon: '🏛️' },
+]
+
+const initialState: GameState = {
+  // Game configuration
+  mode: 'friends5',
+  style: 'practice',
+  timeoutSetting: 'normal',
+  complementDisplay: 'abacus', // Default to showing abacus
+
+  // Current question
+  currentQuestion: null,
+  previousQuestion: null,
+
+  // Game progress
+  score: 0,
+  streak: 0,
+  bestStreak: 0,
+  totalQuestions: 0,
+  correctAnswers: 0,
+
+  // Game status
+  isGameActive: false,
+  isPaused: false,
+  gamePhase: 'controls',
+
+  // Timing
+  gameStartTime: null,
+  questionStartTime: Date.now(),
+
+  // Race mechanics
+  raceGoal: 20,
+  timeLimit: null,
+  speedMultiplier: 1.0,
+  aiRacers: initialAIRacers,
+
+  // Adaptive difficulty
+  difficultyTracker: initialDifficultyTracker,
+
+  // Survival mode specific
+  playerLap: 0,
+  aiLaps: new Map(),
+  survivalMultiplier: 1.0,
+
+  // Sprint mode specific
+  momentum: 0,
+  trainPosition: 0,
+  pressure: 0,
+  elapsedTime: 0,
+  lastCorrectAnswerTime: Date.now(),
+  currentRoute: 1,
+  stations: initialStations,
+  passengers: [],
+  deliveredPassengers: 0,
+  cumulativeDistance: 0,
+  showRouteCelebration: false,
+
+  // Input
+  currentInput: '',
+
+  // UI state
+  showScoreModal: false,
+  activeSpeechBubbles: new Map(),
+  adaptiveFeedback: null,
+}
+
+function gameReducer(state: GameState, action: GameAction): GameState {
+  switch (action.type) {
+    case 'SET_MODE':
+      return { ...state, mode: action.mode }
+
+    case 'SET_STYLE':
+      return { ...state, style: action.style }
+
+    case 'SET_TIMEOUT':
+      return { ...state, timeoutSetting: action.timeout }
+
+    case 'SET_COMPLEMENT_DISPLAY':
+      return { ...state, complementDisplay: action.display }
+
+    case 'SHOW_CONTROLS':
+      return { ...state, gamePhase: 'controls' }
+
+    case 'START_COUNTDOWN':
+      return { ...state, gamePhase: 'countdown' }
+
+    case 'BEGIN_GAME': {
+      // Generate first question when game starts
+      const generateFirstQuestion = () => {
+        let targetSum: number
+        if (state.mode === 'friends5') {
+          targetSum = 5
+        } else if (state.mode === 'friends10') {
+          targetSum = 10
+        } else {
+          targetSum = Math.random() > 0.5 ? 5 : 10
+        }
+
+        const newNumber =
+          targetSum === 5 ? Math.floor(Math.random() * 5) : Math.floor(Math.random() * 10)
+
+        // Decide once whether to show as abacus
+        const showAsAbacus =
+          state.complementDisplay === 'abacus' ||
+          (state.complementDisplay === 'random' && Math.random() < 0.5)
+
+        return {
+          number: newNumber,
+          targetSum,
+          correctAnswer: targetSum - newNumber,
+          showAsAbacus,
+        }
+      }
+
+      return {
+        ...state,
+        gamePhase: 'playing',
+        isGameActive: true,
+        gameStartTime: Date.now(),
+        questionStartTime: Date.now(),
+        currentQuestion: generateFirstQuestion(),
+      }
+    }
+
+    case 'NEXT_QUESTION': {
+      // Generate new question based on mode
+      const generateQuestion = () => {
+        let targetSum: number
+        if (state.mode === 'friends5') {
+          targetSum = 5
+        } else if (state.mode === 'friends10') {
+          targetSum = 10
+        } else {
+          targetSum = Math.random() > 0.5 ? 5 : 10
+        }
+
+        let newNumber: number
+        let attempts = 0
+
+        do {
+          if (targetSum === 5) {
+            newNumber = Math.floor(Math.random() * 5)
+          } else {
+            newNumber = Math.floor(Math.random() * 10)
+          }
+          attempts++
+        } while (
+          state.currentQuestion &&
+          state.currentQuestion.number === newNumber &&
+          state.currentQuestion.targetSum === targetSum &&
+          attempts < 10
+        )
+
+        // Decide once whether to show as abacus
+        const showAsAbacus =
+          state.complementDisplay === 'abacus' ||
+          (state.complementDisplay === 'random' && Math.random() < 0.5)
+
+        return {
+          number: newNumber,
+          targetSum,
+          correctAnswer: targetSum - newNumber,
+          showAsAbacus,
+        }
+      }
+
+      return {
+        ...state,
+        previousQuestion: state.currentQuestion,
+        currentQuestion: generateQuestion(),
+        questionStartTime: Date.now(),
+        currentInput: '',
+      }
+    }
+
+    case 'UPDATE_INPUT':
+      return { ...state, currentInput: action.input }
+
+    case 'SUBMIT_ANSWER': {
+      if (!state.currentQuestion) return state
+
+      const isCorrect = action.answer === state.currentQuestion.correctAnswer
+      const responseTime = Date.now() - state.questionStartTime
+
+      if (isCorrect) {
+        // Calculate speed bonus: max(0, 300 - (avgTime * 10))
+        const speedBonus = Math.max(0, 300 - responseTime / 100)
+
+        // Update score: correctAnswers * 100 + streak * 50 + speedBonus
+        const newStreak = state.streak + 1
+        const newCorrectAnswers = state.correctAnswers + 1
+        const newScore = state.score + 100 + newStreak * 50 + speedBonus
+
+        return {
+          ...state,
+          correctAnswers: newCorrectAnswers,
+          streak: newStreak,
+          bestStreak: Math.max(state.bestStreak, newStreak),
+          score: Math.round(newScore),
+          totalQuestions: state.totalQuestions + 1,
+        }
+      } else {
+        // Incorrect answer - reset streak but keep score
+        return {
+          ...state,
+          streak: 0,
+          totalQuestions: state.totalQuestions + 1,
+        }
+      }
+    }
+
+    case 'UPDATE_AI_POSITIONS':
+      return {
+        ...state,
+        aiRacers: state.aiRacers.map((racer) => {
+          const update = action.positions.find((p) => p.id === racer.id)
+          return update
+            ? { ...racer, previousPosition: racer.position, position: update.position }
+            : racer
+        }),
+      }
+
+    case 'UPDATE_MOMENTUM':
+      return { ...state, momentum: action.momentum }
+
+    case 'UPDATE_TRAIN_POSITION':
+      return { ...state, trainPosition: action.position }
+
+    case 'UPDATE_STEAM_JOURNEY':
+      return {
+        ...state,
+        momentum: action.momentum,
+        trainPosition: action.trainPosition,
+        pressure: action.pressure,
+        elapsedTime: action.elapsedTime,
+      }
+
+    case 'COMPLETE_LAP':
+      if (action.racerId === 'player') {
+        return { ...state, playerLap: state.playerLap + 1 }
+      } else {
+        const newAILaps = new Map(state.aiLaps)
+        newAILaps.set(action.racerId, (newAILaps.get(action.racerId) || 0) + 1)
+        return { ...state, aiLaps: newAILaps }
+      }
+
+    case 'PAUSE_RACE':
+      return { ...state, isPaused: true }
+
+    case 'RESUME_RACE':
+      return { ...state, isPaused: false }
+
+    case 'END_RACE':
+      return { ...state, isGameActive: false }
+
+    case 'SHOW_RESULTS':
+      return { ...state, gamePhase: 'results', showScoreModal: true }
+
+    case 'RESET_GAME':
+      return {
+        ...initialState,
+        // Preserve configuration settings
+        mode: state.mode,
+        style: state.style,
+        timeoutSetting: state.timeoutSetting,
+        complementDisplay: state.complementDisplay,
+        gamePhase: 'controls',
+      }
+
+    case 'TRIGGER_AI_COMMENTARY': {
+      const newBubbles = new Map(state.activeSpeechBubbles)
+      newBubbles.set(action.racerId, action.message)
+      return {
+        ...state,
+        activeSpeechBubbles: newBubbles,
+        // Update racer's lastComment time and cooldown
+        aiRacers: state.aiRacers.map((racer) =>
+          racer.id === action.racerId
+            ? {
+                ...racer,
+                lastComment: Date.now(),
+                commentCooldown: Math.random() * 4000 + 2000, // 2-6 seconds
+              }
+            : racer
+        ),
+      }
+    }
+
+    case 'CLEAR_AI_COMMENT': {
+      const clearedBubbles = new Map(state.activeSpeechBubbles)
+      clearedBubbles.delete(action.racerId)
+      return {
+        ...state,
+        activeSpeechBubbles: clearedBubbles,
+      }
+    }
+
+    case 'UPDATE_DIFFICULTY_TRACKER':
+      return {
+        ...state,
+        difficultyTracker: action.tracker,
+      }
+
+    case 'UPDATE_AI_SPEEDS':
+      return {
+        ...state,
+        aiRacers: action.racers,
+      }
+
+    case 'SHOW_ADAPTIVE_FEEDBACK':
+      return {
+        ...state,
+        adaptiveFeedback: action.feedback,
+      }
+
+    case 'CLEAR_ADAPTIVE_FEEDBACK':
+      return {
+        ...state,
+        adaptiveFeedback: null,
+      }
+
+    case 'GENERATE_PASSENGERS':
+      return {
+        ...state,
+        passengers: action.passengers,
+      }
+
+    case 'BOARD_PASSENGER':
+      return {
+        ...state,
+        passengers: state.passengers.map((p) =>
+          p.id === action.passengerId ? { ...p, isBoarded: true } : p
+        ),
+      }
+
+    case 'DELIVER_PASSENGER':
+      return {
+        ...state,
+        passengers: state.passengers.map((p) =>
+          p.id === action.passengerId ? { ...p, isDelivered: true } : p
+        ),
+        deliveredPassengers: state.deliveredPassengers + 1,
+        score: state.score + action.points,
+      }
+
+    case 'START_NEW_ROUTE':
+      return {
+        ...state,
+        currentRoute: action.routeNumber,
+        stations: action.stations,
+        trainPosition: -5, // Start off-screen to the left for smooth fade-in
+        deliveredPassengers: 0,
+        showRouteCelebration: false,
+        momentum: 50, // Give some starting momentum for the new route
+        pressure: 50,
+      }
+
+    case 'COMPLETE_ROUTE':
+      return {
+        ...state,
+        cumulativeDistance: state.cumulativeDistance + 100,
+        showRouteCelebration: true,
+      }
+
+    case 'HIDE_ROUTE_CELEBRATION':
+      return {
+        ...state,
+        showRouteCelebration: false,
+      }
+
+    default:
+      return state
+  }
+}
+
+interface ComplementRaceContextType {
+  state: GameState
+  dispatch: React.Dispatch<GameAction>
+}
+
+const ComplementRaceContext = createContext<ComplementRaceContextType | undefined>(undefined)
+
+interface ComplementRaceProviderProps {
+  children: ReactNode
+  initialStyle?: 'practice' | 'sprint' | 'survival'
+}
+
+export function ComplementRaceProvider({ children, initialStyle }: ComplementRaceProviderProps) {
+  const [state, dispatch] = useReducer(gameReducer, {
+    ...initialState,
+    style: initialStyle || initialState.style,
+  })
+
+  return (
+    <ComplementRaceContext.Provider value={{ state, dispatch }}>
+      {children}
+    </ComplementRaceContext.Provider>
+  )
+}
+
+export function useComplementRace() {
+  const context = useContext(ComplementRaceContext)
+  if (context === undefined) {
+    throw new Error('useComplementRace must be used within ComplementRaceProvider')
+  }
+  return context
+}
--- a/apps/web/src/app/arcade/complement-race/hooks/tests/usePassengerAnimations.test.ts
+++ b/apps/web/src/app/arcade/complement-race/hooks/tests/usePassengerAnimations.test.ts
@@ -0,0 +1,279 @@
+import { renderHook } from '@testing-library/react'
+import { beforeEach, describe, expect, test, vi } from 'vitest'
+import type { Passenger, Station } from '../../lib/gameTypes'
+import type { RailroadTrackGenerator } from '../../lib/RailroadTrackGenerator'
+import { usePassengerAnimations } from '../usePassengerAnimations'
+
+describe('usePassengerAnimations', () => {
+  let mockPathRef: React.RefObject<SVGPathElement>
+  let mockTrackGenerator: RailroadTrackGenerator
+  let mockStation1: Station
+  let mockStation2: Station
+  let mockPassenger1: Passenger
+  let mockPassenger2: Passenger
+
+  beforeEach(() => {
+    // Create mock path element
+    const mockPath = document.createElementNS('http://www.w3.org/2000/svg', 'path')
+    mockPathRef = { current: mockPath }
+
+    // Mock track generator
+    mockTrackGenerator = {
+      getTrainTransform: vi.fn((_path: SVGPathElement, position: number) => ({
+        x: position * 10,
+        y: 300,
+        rotation: 0,
+      })),
+    } as unknown as RailroadTrackGenerator
+
+    // Create mock stations
+    mockStation1 = {
+      id: 'station-1',
+      name: 'Station 1',
+      position: 20,
+      icon: '🏭',
+    }
+
+    mockStation2 = {
+      id: 'station-2',
+      name: 'Station 2',
+      position: 60,
+      icon: '🏛️',
+    }
+
+    // Create mock passengers
+    mockPassenger1 = {
+      id: 'passenger-1',
+      avatar: '👨',
+      originStationId: 'station-1',
+      destinationStationId: 'station-2',
+      isBoarded: false,
+      isDelivered: false,
+      isUrgent: false,
+    }
+
+    mockPassenger2 = {
+      id: 'passenger-2',
+      avatar: '👩',
+      originStationId: 'station-1',
+      destinationStationId: 'station-2',
+      isBoarded: false,
+      isDelivered: false,
+      isUrgent: true,
+    }
+
+    vi.clearAllMocks()
+  })
+
+  test('initializes with empty animation maps', () => {
+    const { result } = renderHook(() =>
+      usePassengerAnimations({
+        passengers: [],
+        stations: [mockStation1, mockStation2],
+        stationPositions: [
+          { x: 100, y: 300 },
+          { x: 500, y: 300 },
+        ],
+        trainPosition: 0,
+        trackGenerator: mockTrackGenerator,
+        pathRef: mockPathRef,
+      })
+    )
+
+    expect(result.current.boardingAnimations.size).toBe(0)
+    expect(result.current.disembarkingAnimations.size).toBe(0)
+  })
+
+  test('creates boarding animation when passenger boards', () => {
+    const { result, rerender } = renderHook(
+      ({ passengers }) =>
+        usePassengerAnimations({
+          passengers,
+          stations: [mockStation1, mockStation2],
+          stationPositions: [
+            { x: 100, y: 300 },
+            { x: 500, y: 300 },
+          ],
+          trainPosition: 20,
+          trackGenerator: mockTrackGenerator,
+          pathRef: mockPathRef,
+        }),
+      {
+        initialProps: {
+          passengers: [mockPassenger1],
+        },
+      }
+    )
+
+    // Initially no boarding animations
+    expect(result.current.boardingAnimations.size).toBe(0)
+
+    // Passenger boards
+    const boardedPassenger = { ...mockPassenger1, isBoarded: true }
+    rerender({ passengers: [boardedPassenger] })
+
+    // Should create boarding animation
+    expect(result.current.boardingAnimations.size).toBe(1)
+    expect(result.current.boardingAnimations.has('passenger-1')).toBe(true)
+
+    const animation = result.current.boardingAnimations.get('passenger-1')
+    expect(animation).toBeDefined()
+    expect(animation?.passenger).toEqual(boardedPassenger)
+    expect(animation?.fromX).toBe(100) // Station position
+    expect(animation?.fromY).toBe(270) // Station position - 30
+    expect(mockTrackGenerator.getTrainTransform).toHaveBeenCalled()
+  })
+
+  test('creates disembarking animation when passenger is delivered', () => {
+    const boardedPassenger = { ...mockPassenger1, isBoarded: true }
+
+    const { result, rerender } = renderHook(
+      ({ passengers }) =>
+        usePassengerAnimations({
+          passengers,
+          stations: [mockStation1, mockStation2],
+          stationPositions: [
+            { x: 100, y: 300 },
+            { x: 500, y: 300 },
+          ],
+          trainPosition: 60,
+          trackGenerator: mockTrackGenerator,
+          pathRef: mockPathRef,
+        }),
+      {
+        initialProps: {
+          passengers: [boardedPassenger],
+        },
+      }
+    )
+
+    // Initially no disembarking animations
+    expect(result.current.disembarkingAnimations.size).toBe(0)
+
+    // Passenger is delivered
+    const deliveredPassenger = { ...boardedPassenger, isDelivered: true }
+    rerender({ passengers: [deliveredPassenger] })
+
+    // Should create disembarking animation
+    expect(result.current.disembarkingAnimations.size).toBe(1)
+    expect(result.current.disembarkingAnimations.has('passenger-1')).toBe(true)
+
+    const animation = result.current.disembarkingAnimations.get('passenger-1')
+    expect(animation).toBeDefined()
+    expect(animation?.passenger).toEqual(deliveredPassenger)
+    expect(animation?.toX).toBe(500) // Destination station position
+    expect(animation?.toY).toBe(270) // Station position - 30
+  })
+
+  test('handles multiple passengers boarding simultaneously', () => {
+    const { result, rerender } = renderHook(
+      ({ passengers }) =>
+        usePassengerAnimations({
+          passengers,
+          stations: [mockStation1, mockStation2],
+          stationPositions: [
+            { x: 100, y: 300 },
+            { x: 500, y: 300 },
+          ],
+          trainPosition: 20,
+          trackGenerator: mockTrackGenerator,
+          pathRef: mockPathRef,
+        }),
+      {
+        initialProps: {
+          passengers: [mockPassenger1, mockPassenger2],
+        },
+      }
+    )
+
+    // Both passengers board
+    const boardedPassengers = [
+      { ...mockPassenger1, isBoarded: true },
+      { ...mockPassenger2, isBoarded: true },
+    ]
+    rerender({ passengers: boardedPassengers })
+
+    // Should create boarding animations for both
+    expect(result.current.boardingAnimations.size).toBe(2)
+    expect(result.current.boardingAnimations.has('passenger-1')).toBe(true)
+    expect(result.current.boardingAnimations.has('passenger-2')).toBe(true)
+  })
+
+  test('does not create animation if passenger already boarded in previous state', () => {
+    const boardedPassenger = { ...mockPassenger1, isBoarded: true }
+
+    const { result } = renderHook(() =>
+      usePassengerAnimations({
+        passengers: [boardedPassenger],
+        stations: [mockStation1, mockStation2],
+        stationPositions: [
+          { x: 100, y: 300 },
+          { x: 500, y: 300 },
+        ],
+        trainPosition: 20,
+        trackGenerator: mockTrackGenerator,
+        pathRef: mockPathRef,
+      })
+    )
+
+    // No animation since passenger was already boarded
+    expect(result.current.boardingAnimations.size).toBe(0)
+  })
+
+  test('returns empty animations when pathRef is null', () => {
+    const nullPathRef: React.RefObject<SVGPathElement> = { current: null }
+
+    const { result, rerender } = renderHook(
+      ({ passengers }) =>
+        usePassengerAnimations({
+          passengers,
+          stations: [mockStation1, mockStation2],
+          stationPositions: [
+            { x: 100, y: 300 },
+            { x: 500, y: 300 },
+          ],
+          trainPosition: 20,
+          trackGenerator: mockTrackGenerator,
+          pathRef: nullPathRef,
+        }),
+      {
+        initialProps: {
+          passengers: [mockPassenger1],
+        },
+      }
+    )
+
+    // Passenger boards
+    const boardedPassenger = { ...mockPassenger1, isBoarded: true }
+    rerender({ passengers: [boardedPassenger] })
+
+    // Should not create animation without path
+    expect(result.current.boardingAnimations.size).toBe(0)
+  })
+
+  test('returns empty animations when stationPositions is empty', () => {
+    const { result, rerender } = renderHook(
+      ({ passengers }) =>
+        usePassengerAnimations({
+          passengers,
+          stations: [mockStation1, mockStation2],
+          stationPositions: [],
+          trainPosition: 20,
+          trackGenerator: mockTrackGenerator,
+          pathRef: mockPathRef,
+        }),
+      {
+        initialProps: {
+          passengers: [mockPassenger1],
+        },
+      }
+    )
+
+    // Passenger boards
+    const boardedPassenger = { ...mockPassenger1, isBoarded: true }
+    rerender({ passengers: [boardedPassenger] })
+
+    // Should not create animation without station positions
+    expect(result.current.boardingAnimations.size).toBe(0)
+  })
+})
--- a/apps/web/src/app/arcade/complement-race/hooks/tests/useSteamJourney.boarding.test.ts
+++ b/apps/web/src/app/arcade/complement-race/hooks/tests/useSteamJourney.boarding.test.ts
@@ -0,0 +1,353 @@
+import { afterEach, beforeEach, describe, expect, test, vi } from 'vitest'
+
+// Mock sound effects
+vi.mock('../useSoundEffects', () => ({
+  useSoundEffects: () => ({
+    playSound: vi.fn(),
+  }),
+}))
+
+/**
+ * Boarding Logic Tests
+ *
+ * These tests simulate the game loop's boarding logic to find edge cases
+ * where passengers get left behind at stations.
+ */
+
+interface Passenger {
+  id: string
+  name: string
+  avatar: string
+  originStationId: string
+  destinationStationId: string
+  isBoarded: boolean
+  isDelivered: boolean
+  isUrgent: boolean
+}
+
+interface Station {
+  id: string
+  name: string
+  icon: string
+  position: number
+}
+
+describe('useSteamJourney - Boarding Logic', () => {
+  const CAR_SPACING = 7
+  let stations: Station[]
+  let passengers: Passenger[]
+
+  beforeEach(() => {
+    stations = [
+      { id: 's1', name: 'Station 1', icon: '🏠', position: 20 },
+      { id: 's2', name: 'Station 2', icon: '🏢', position: 50 },
+      { id: 's3', name: 'Station 3', icon: '🏪', position: 80 },
+    ]
+
+    vi.useFakeTimers()
+  })
+
+  afterEach(() => {
+    vi.useRealTimers()
+  })
+
+  /**
+   * Simulate the boarding logic from useSteamJourney (with fix)
+   */
+  function simulateBoardingAtPosition(
+    trainPosition: number,
+    passengers: Passenger[],
+    stations: Station[],
+    maxCars: number
+  ): Passenger[] {
+    const updatedPassengers = [...passengers]
+    const currentBoardedPassengers = updatedPassengers.filter((p) => p.isBoarded && !p.isDelivered)
+
+    // Track which cars are assigned in THIS frame to prevent double-boarding
+    const carsAssignedThisFrame = new Set<number>()
+
+    // Simulate the boarding logic
+    updatedPassengers.forEach((passenger, passengerIndex) => {
+      if (passenger.isBoarded || passenger.isDelivered) return
+
+      const station = stations.find((s) => s.id === passenger.originStationId)
+      if (!station) return
+
+      // Check if any empty car is at this station
+      for (let carIndex = 0; carIndex < maxCars; carIndex++) {
+        // Skip if this car already has a passenger OR was assigned this frame
+        if (currentBoardedPassengers[carIndex] || carsAssignedThisFrame.has(carIndex)) continue
+
+        const carPosition = Math.max(0, trainPosition - (carIndex + 1) * CAR_SPACING)
+        const distance = Math.abs(carPosition - station.position)
+
+        // If car is at station (within 3% tolerance), board this passenger
+        if (distance < 3) {
+          updatedPassengers[passengerIndex] = { ...passenger, isBoarded: true }
+          // Mark this car as assigned in this frame
+          carsAssignedThisFrame.add(carIndex)
+          return // Board this passenger and move on
+        }
+      }
+    })
+
+    return updatedPassengers
+  }
+
+  test('single passenger at station boards when car arrives', () => {
+    passengers = [
+      {
+        id: 'p1',
+        name: 'Alice',
+        avatar: '👩',
+        originStationId: 's1',
+        destinationStationId: 's2',
+        isBoarded: false,
+        isDelivered: false,
+        isUrgent: false,
+      },
+    ]
+
+    // Train at position 27%, first car at position 20% (station 1)
+    const result = simulateBoardingAtPosition(27, passengers, stations, 1)
+
+    expect(result[0].isBoarded).toBe(true)
+  })
+
+  test('EDGE CASE: multiple passengers at same station with enough cars', () => {
+    passengers = [
+      {
+        id: 'p1',
+        name: 'Alice',
+        avatar: '👩',
+        originStationId: 's1',
+        destinationStationId: 's2',
+        isBoarded: false,
+        isDelivered: false,
+        isUrgent: false,
+      },
+      {
+        id: 'p2',
+        name: 'Bob',
+        avatar: '👨',
+        originStationId: 's1',
+        destinationStationId: 's2',
+        isBoarded: false,
+        isDelivered: false,
+        isUrgent: false,
+      },
+      {
+        id: 'p3',
+        name: 'Charlie',
+        avatar: '👴',
+        originStationId: 's1',
+        destinationStationId: 's2',
+        isBoarded: false,
+        isDelivered: false,
+        isUrgent: false,
+      },
+    ]
+
+    // Train at position 34%, cars at: 27%, 20%, 13%
+    // Car 1 (27%): 7% away from station (too far)
+    // Car 2 (20%): 0% away from station (at station!)
+    // Car 3 (13%): 7% away from station (too far)
+    let result = simulateBoardingAtPosition(34, passengers, stations, 3)
+
+    // First iteration: car 2 is at station, should board first passenger
+    expect(result[0].isBoarded).toBe(true)
+
+    // But what about the other passengers? They should board on subsequent frames
+    // Let's simulate the train advancing slightly
+    result = simulateBoardingAtPosition(35, result, stations, 3)
+
+    // Now car 1 is at 28% (still too far), car 2 at 21% (still close), car 3 at 14% (too far)
+    // Passenger 2 should still not board yet
+
+    // Advance more - when does car 1 reach the station?
+    result = simulateBoardingAtPosition(27, result, stations, 3)
+    // Car 1 at 20% (at station!)
+    expect(result[1].isBoarded).toBe(true)
+
+    // What about passenger 3? Need car 3 to reach station
+    // Car 3 position = trainPosition - (3 * 7) = trainPosition - 21
+    // For car 3 to be at 20%, need trainPosition = 41
+    result = simulateBoardingAtPosition(41, result, stations, 3)
+    // Car 3 at 20% (at station!)
+    expect(result[2].isBoarded).toBe(true)
+  })
+
+  test('EDGE CASE: passengers left behind when train moves too fast', () => {
+    passengers = [
+      {
+        id: 'p1',
+        name: 'Alice',
+        avatar: '👩',
+        originStationId: 's1',
+        destinationStationId: 's2',
+        isBoarded: false,
+        isDelivered: false,
+        isUrgent: false,
+      },
+      {
+        id: 'p2',
+        name: 'Bob',
+        avatar: '👨',
+        originStationId: 's1',
+        destinationStationId: 's2',
+        isBoarded: false,
+        isDelivered: false,
+        isUrgent: false,
+      },
+    ]
+
+    // Simulate train speeding through station
+    // Only 2 cars, but 2 passengers at same station
+
+    // Frame 1: Train at 27%, car 1 at 20%, car 2 at 13%
+    let result = simulateBoardingAtPosition(27, passengers, stations, 2)
+    expect(result[0].isBoarded).toBe(true)
+    expect(result[1].isBoarded).toBe(false)
+
+    // Frame 2: Train jumps to 35% (high momentum)
+    // Car 1 at 28%, car 2 at 21%
+    result = simulateBoardingAtPosition(35, result, stations, 2)
+    // Car 2 is at 21%, within 1% of station at 20%
+    expect(result[1].isBoarded).toBe(true)
+
+    // Frame 3: Train at 45% - both cars past station
+    result = simulateBoardingAtPosition(45, result, stations, 2)
+    // Car 1 at 38%, car 2 at 31% - both way past 20%
+
+    // All passengers should have boarded
+    expect(result.every((p) => p.isBoarded)).toBe(true)
+  })
+
+  test('EDGE CASE: passenger left behind when boarding window is missed', () => {
+    passengers = [
+      {
+        id: 'p1',
+        name: 'Alice',
+        avatar: '👩',
+        originStationId: 's1',
+        destinationStationId: 's2',
+        isBoarded: false,
+        isDelivered: false,
+        isUrgent: false,
+      },
+      {
+        id: 'p2',
+        name: 'Bob',
+        avatar: '👨',
+        originStationId: 's1',
+        destinationStationId: 's2',
+        isBoarded: false,
+        isDelivered: false,
+        isUrgent: false,
+      },
+    ]
+
+    // Only 1 car, 2 passengers
+    // Frame 1: Train at 27%, car at 20%
+    let result = simulateBoardingAtPosition(27, passengers, stations, 1)
+    expect(result[0].isBoarded).toBe(true)
+    expect(result[1].isBoarded).toBe(false) // Second passenger waiting
+
+    // Frame 2: Train jumps way past (very high momentum)
+    result = simulateBoardingAtPosition(50, result, stations, 1)
+    // Car at 43% - way past station at 20%
+
+    // Second passenger SHOULD BE LEFT BEHIND!
+    expect(result[1].isBoarded).toBe(false)
+  })
+
+  test('EDGE CASE: only one passenger boards per car per frame', () => {
+    passengers = [
+      {
+        id: 'p1',
+        name: 'Alice',
+        avatar: '👩',
+        originStationId: 's1',
+        destinationStationId: 's2',
+        isBoarded: false,
+        isDelivered: false,
+        isUrgent: false,
+      },
+      {
+        id: 'p2',
+        name: 'Bob',
+        avatar: '👨',
+        originStationId: 's1',
+        destinationStationId: 's2',
+        isBoarded: false,
+        isDelivered: false,
+        isUrgent: false,
+      },
+    ]
+
+    // Only 1 car, both passengers at same station
+    // With the fix, only first passenger should board in this frame
+    const result = simulateBoardingAtPosition(27, passengers, stations, 1)
+
+    // First passenger boards
+    expect(result[0].isBoarded).toBe(true)
+    // Second passenger does NOT board (car already assigned this frame)
+    expect(result[1].isBoarded).toBe(false)
+  })
+
+  test('all passengers board before train completely passes station', () => {
+    passengers = [
+      {
+        id: 'p1',
+        name: 'Alice',
+        avatar: '👩',
+        originStationId: 's1',
+        destinationStationId: 's2',
+        isBoarded: false,
+        isDelivered: false,
+        isUrgent: false,
+      },
+      {
+        id: 'p2',
+        name: 'Bob',
+        avatar: '👨',
+        originStationId: 's1',
+        destinationStationId: 's2',
+        isBoarded: false,
+        isDelivered: false,
+        isUrgent: false,
+      },
+      {
+        id: 'p3',
+        name: 'Charlie',
+        avatar: '👴',
+        originStationId: 's1',
+        destinationStationId: 's2',
+        isBoarded: false,
+        isDelivered: false,
+        isUrgent: false,
+      },
+    ]
+
+    // 3 passengers, 3 cars
+    // Simulate train moving through station frame by frame
+    let result = passengers
+
+    // Train approaching station
+    for (let pos = 13; pos <= 40; pos += 1) {
+      result = simulateBoardingAtPosition(pos, result, stations, 3)
+    }
+
+    // All passengers should have boarded by the time last car passes
+    const allBoarded = result.every((p) => p.isBoarded)
+    const leftBehind = result.filter((p) => !p.isBoarded)
+
+    expect(allBoarded).toBe(true)
+    if (!allBoarded) {
+      console.log(
+        'Passengers left behind:',
+        leftBehind.map((p) => p.name)
+      )
+    }
+  })
+})
--- a/apps/web/src/app/arcade/complement-race/hooks/tests/useSteamJourney.passenger.test.tsx
+++ b/apps/web/src/app/arcade/complement-race/hooks/tests/useSteamJourney.passenger.test.tsx
@@ -0,0 +1,292 @@
+/**
+ * Unit tests for passenger boarding/delivery logic in useSteamJourney
+ *
+ * These tests ensure that:
+ * 1. Passengers always board when an empty car reaches their origin station
+ * 2. Passengers are never left behind
+ * 3. Multiple passengers can board at the same station on different cars
+ * 4. Passengers are delivered to the correct destination
+ */
+
+import { act, renderHook } from '@testing-library/react'
+import type { ReactNode } from 'react'
+import { ComplementRaceProvider, useComplementRace } from '../../context/ComplementRaceContext'
+import type { Passenger, Station } from '../../lib/gameTypes'
+import { useSteamJourney } from '../useSteamJourney'
+
+// Mock sound effects
+jest.mock('../useSoundEffects', () => ({
+  useSoundEffects: () => ({
+    playSound: jest.fn(),
+  }),
+}))
+
+// Wrapper component
+const wrapper = ({ children }: { children: ReactNode }) => (
+  <ComplementRaceProvider initialStyle="sprint">{children}</ComplementRaceProvider>
+)
+
+// Helper to create test passengers
+const createPassenger = (
+  id: string,
+  originStationId: string,
+  destinationStationId: string,
+  isBoarded = false,
+  isDelivered = false
+): Passenger => ({
+  id,
+  name: `Passenger ${id}`,
+  avatar: '👤',
+  originStationId,
+  destinationStationId,
+  isUrgent: false,
+  isBoarded,
+  isDelivered,
+})
+
+// Test stations
+const _testStations: Station[] = [
+  { id: 'station-0', name: 'Start', position: 0, icon: '🏁' },
+  { id: 'station-1', name: 'Middle', position: 50, icon: '🏢' },
+  { id: 'station-2', name: 'End', position: 100, icon: '🏁' },
+]
+
+describe('useSteamJourney - Passenger Boarding', () => {
+  beforeEach(() => {
+    jest.useFakeTimers()
+  })
+
+  afterEach(() => {
+    jest.runOnlyPendingTimers()
+    jest.useRealTimers()
+  })
+
+  test('passenger boards when train reaches their origin station', () => {
+    const { result } = renderHook(
+      () => {
+        const journey = useSteamJourney()
+        const race = useComplementRace()
+        return { journey, race }
+      },
+      { wrapper }
+    )
+
+    // Setup: Add passenger waiting at station-1 (position 50)
+    const passenger = createPassenger('p1', 'station-1', 'station-2')
+
+    act(() => {
+      result.current.race.dispatch({ type: 'BEGIN_GAME' })
+      result.current.race.dispatch({
+        type: 'GENERATE_PASSENGERS',
+        passengers: [passenger],
+      })
+      // Set train position just before station-1
+      result.current.race.dispatch({
+        type: 'UPDATE_STEAM_JOURNEY',
+        momentum: 50,
+        trainPosition: 40, // First car will be at ~33 (40 - 7)
+        pressure: 75,
+        elapsedTime: 1000,
+      })
+    })
+
+    // Verify passenger is waiting
+    expect(result.current.race.state.passengers[0].isBoarded).toBe(false)
+
+    // Move train to station-1 position
+    act(() => {
+      result.current.race.dispatch({
+        type: 'UPDATE_STEAM_JOURNEY',
+        momentum: 50,
+        trainPosition: 57, // First car at position 50 (57 - 7)
+        pressure: 75,
+        elapsedTime: 2000,
+      })
+    })
+
+    // Advance timers to trigger the interval
+    act(() => {
+      jest.advanceTimersByTime(100)
+    })
+
+    // Verify passenger boarded
+    const boardedPassenger = result.current.race.state.passengers.find((p) => p.id === 'p1')
+    expect(boardedPassenger?.isBoarded).toBe(true)
+  })
+
+  test('multiple passengers can board at the same station on different cars', () => {
+    const { result } = renderHook(
+      () => {
+        const journey = useSteamJourney()
+        const race = useComplementRace()
+        return { journey, race }
+      },
+      { wrapper }
+    )
+
+    // Setup: Three passengers waiting at station-1
+    const passengers = [
+      createPassenger('p1', 'station-1', 'station-2'),
+      createPassenger('p2', 'station-1', 'station-2'),
+      createPassenger('p3', 'station-1', 'station-2'),
+    ]
+
+    act(() => {
+      result.current.race.dispatch({ type: 'BEGIN_GAME' })
+      result.current.race.dispatch({
+        type: 'GENERATE_PASSENGERS',
+        passengers,
+      })
+      // Set train with 3 empty cars approaching station-1 (position 50)
+      // Cars at: 50 (57-7), 43 (57-14), 36 (57-21)
+      result.current.race.dispatch({
+        type: 'UPDATE_STEAM_JOURNEY',
+        momentum: 60,
+        trainPosition: 57,
+        pressure: 90,
+        elapsedTime: 1000,
+      })
+    })
+
+    // Advance timers
+    act(() => {
+      jest.advanceTimersByTime(100)
+    })
+
+    // All three passengers should board (one per car)
+    const boardedCount = result.current.race.state.passengers.filter((p) => p.isBoarded).length
+    expect(boardedCount).toBe(3)
+  })
+
+  test('passenger is not left behind when train passes quickly', () => {
+    const { result } = renderHook(
+      () => {
+        const journey = useSteamJourney()
+        const race = useComplementRace()
+        return { journey, race }
+      },
+      { wrapper }
+    )
+
+    const passenger = createPassenger('p1', 'station-1', 'station-2')
+
+    act(() => {
+      result.current.race.dispatch({ type: 'BEGIN_GAME' })
+      result.current.race.dispatch({
+        type: 'GENERATE_PASSENGERS',
+        passengers: [passenger],
+      })
+    })
+
+    // Simulate train passing through station quickly
+    const positions = [40, 45, 50, 52, 54, 56, 58, 60, 65, 70]
+
+    for (const pos of positions) {
+      act(() => {
+        result.current.race.dispatch({
+          type: 'UPDATE_STEAM_JOURNEY',
+          momentum: 80,
+          trainPosition: pos,
+          pressure: 120,
+          elapsedTime: 1000 + pos * 50,
+        })
+        jest.advanceTimersByTime(50)
+      })
+
+      // Check if passenger boarded
+      const boardedPassenger = result.current.race.state.passengers.find((p) => p.id === 'p1')
+      if (boardedPassenger?.isBoarded) {
+        // Success! Passenger boarded during the pass
+        return
+      }
+    }
+
+    // If we get here, passenger was left behind
+    const boardedPassenger = result.current.race.state.passengers.find((p) => p.id === 'p1')
+    expect(boardedPassenger?.isBoarded).toBe(true)
+  })
+
+  test('passenger boards on correct car based on availability', () => {
+    const { result } = renderHook(
+      () => {
+        const journey = useSteamJourney()
+        const race = useComplementRace()
+        return { journey, race }
+      },
+      { wrapper }
+    )
+
+    // Setup: One passenger already on car 0, another waiting
+    const passengers = [
+      createPassenger('p1', 'station-0', 'station-2', true, false), // Already boarded on car 0
+      createPassenger('p2', 'station-1', 'station-2'), // Waiting at station-1
+    ]
+
+    act(() => {
+      result.current.race.dispatch({ type: 'BEGIN_GAME' })
+      result.current.race.dispatch({
+        type: 'GENERATE_PASSENGERS',
+        passengers,
+      })
+      // Train at station-1, car 0 occupied, car 1 empty
+      result.current.race.dispatch({
+        type: 'UPDATE_STEAM_JOURNEY',
+        momentum: 50,
+        trainPosition: 57, // Car 0 at 50, Car 1 at 43
+        pressure: 75,
+        elapsedTime: 2000,
+      })
+    })
+
+    act(() => {
+      jest.advanceTimersByTime(100)
+    })
+
+    // p2 should board (on car 1 since car 0 is occupied)
+    const p2 = result.current.race.state.passengers.find((p) => p.id === 'p2')
+    expect(p2?.isBoarded).toBe(true)
+
+    // p1 should still be boarded
+    const p1 = result.current.race.state.passengers.find((p) => p.id === 'p1')
+    expect(p1?.isBoarded).toBe(true)
+    expect(p1?.isDelivered).toBe(false)
+  })
+
+  test('passenger is delivered when their car reaches destination', () => {
+    const { result } = renderHook(
+      () => {
+        const journey = useSteamJourney()
+        const race = useComplementRace()
+        return { journey, race }
+      },
+      { wrapper }
+    )
+
+    // Setup: Passenger already boarded, heading to station-2 (position 100)
+    const passenger = createPassenger('p1', 'station-0', 'station-2', true, false)
+
+    act(() => {
+      result.current.race.dispatch({ type: 'BEGIN_GAME' })
+      result.current.race.dispatch({
+        type: 'GENERATE_PASSENGERS',
+        passengers: [passenger],
+      })
+      // Move train so car 0 reaches station-2
+      result.current.race.dispatch({
+        type: 'UPDATE_STEAM_JOURNEY',
+        momentum: 50,
+        trainPosition: 107, // Car 0 at position 100 (107 - 7)
+        pressure: 75,
+        elapsedTime: 5000,
+      })
+    })
+
+    act(() => {
+      jest.advanceTimersByTime(100)
+    })
+
+    // Passenger should be delivered
+    const deliveredPassenger = result.current.race.state.passengers.find((p) => p.id === 'p1')
+    expect(deliveredPassenger?.isDelivered).toBe(true)
+  })
+})
--- a/apps/web/src/app/arcade/complement-race/hooks/tests/useTrackManagement.passenger-display.test.ts
+++ b/apps/web/src/app/arcade/complement-race/hooks/tests/useTrackManagement.passenger-display.test.ts
@@ -0,0 +1,500 @@
+import { renderHook } from '@testing-library/react'
+import { beforeEach, describe, expect, test, vi } from 'vitest'
+import type { Passenger, Station } from '../../lib/gameTypes'
+import type { RailroadTrackGenerator } from '../../lib/RailroadTrackGenerator'
+import { useTrackManagement } from '../useTrackManagement'
+
+describe('useTrackManagement - Passenger Display', () => {
+  let mockPathRef: React.RefObject<SVGPathElement>
+  let mockTrackGenerator: RailroadTrackGenerator
+  let mockStations: Station[]
+  let mockPassengers: Passenger[]
+
+  beforeEach(() => {
+    // Create mock path element
+    const mockPath = document.createElementNS('http://www.w3.org/2000/svg', 'path')
+    mockPath.getTotalLength = vi.fn(() => 1000)
+    mockPath.getPointAtLength = vi.fn((distance: number) => ({
+      x: distance,
+      y: 300,
+    }))
+    mockPathRef = { current: mockPath }
+
+    // Mock track generator
+    mockTrackGenerator = {
+      generateTrack: vi.fn(() => ({
+        ballastPath: 'M 0 0',
+        referencePath: 'M 0 0',
+        ties: [],
+        leftRailPath: 'M 0 0',
+        rightRailPath: 'M 0 0',
+      })),
+      generateTiesAndRails: vi.fn(() => ({
+        ties: [],
+        leftRailPath: 'M 0 0',
+        rightRailPath: 'M 0 0',
+      })),
+    } as unknown as RailroadTrackGenerator
+
+    // Mock stations
+    mockStations = [
+      { id: 'station1', name: 'Station 1', icon: '🏠', position: 20 },
+      { id: 'station2', name: 'Station 2', icon: '🏢', position: 50 },
+      { id: 'station3', name: 'Station 3', icon: '🏪', position: 80 },
+    ]
+
+    // Mock passengers - initial set
+    mockPassengers = [
+      {
+        id: 'p1',
+        name: 'Alice',
+        avatar: '👩',
+        originStationId: 'station1',
+        destinationStationId: 'station2',
+        isBoarded: false,
+        isDelivered: false,
+        isUrgent: false,
+      },
+      {
+        id: 'p2',
+        name: 'Bob',
+        avatar: '👨',
+        originStationId: 'station2',
+        destinationStationId: 'station3',
+        isBoarded: false,
+        isDelivered: false,
+        isUrgent: false,
+      },
+    ]
+
+    vi.clearAllMocks()
+  })
+
+  test('initial passengers are displayed', () => {
+    const { result } = renderHook(() =>
+      useTrackManagement({
+        currentRoute: 1,
+        trainPosition: 10,
+        trackGenerator: mockTrackGenerator,
+        pathRef: mockPathRef,
+        stations: mockStations,
+        passengers: mockPassengers,
+        maxCars: 3,
+        carSpacing: 7,
+      })
+    )
+
+    expect(result.current.displayPassengers).toHaveLength(2)
+    expect(result.current.displayPassengers[0].id).toBe('p1')
+    expect(result.current.displayPassengers[1].id).toBe('p2')
+  })
+
+  test('passengers update when boarded (same route gameplay)', () => {
+    const { result, rerender } = renderHook(
+      ({ passengers, position }) =>
+        useTrackManagement({
+          currentRoute: 1,
+          trainPosition: position,
+          trackGenerator: mockTrackGenerator,
+          pathRef: mockPathRef,
+          stations: mockStations,
+          passengers,
+          maxCars: 3,
+          carSpacing: 7,
+        }),
+      { initialProps: { passengers: mockPassengers, position: 25 } }
+    )
+
+    // Initially 2 passengers
+    expect(result.current.displayPassengers).toHaveLength(2)
+    expect(result.current.displayPassengers[0].isBoarded).toBe(false)
+
+    // Board first passenger
+    const boardedPassengers = mockPassengers.map((p) =>
+      p.id === 'p1' ? { ...p, isBoarded: true } : p
+    )
+
+    rerender({ passengers: boardedPassengers, position: 25 })
+
+    // Should show updated passengers
+    expect(result.current.displayPassengers).toHaveLength(2)
+    expect(result.current.displayPassengers[0].isBoarded).toBe(true)
+  })
+
+  test('passengers do NOT update during route transition (train moving)', () => {
+    const { result, rerender } = renderHook(
+      ({ route, passengers, position }) =>
+        useTrackManagement({
+          currentRoute: route,
+          trainPosition: position,
+          trackGenerator: mockTrackGenerator,
+          pathRef: mockPathRef,
+          stations: mockStations,
+          passengers,
+          maxCars: 3,
+          carSpacing: 7,
+        }),
+      { initialProps: { route: 1, passengers: mockPassengers, position: 50 } }
+    )
+
+    // Initially route 1 passengers
+    expect(result.current.displayPassengers).toHaveLength(2)
+    expect(result.current.displayPassengers[0].id).toBe('p1')
+
+    // Generate new passengers for route 2
+    const newPassengers: Passenger[] = [
+      {
+        id: 'p3',
+        name: 'Charlie',
+        avatar: '👴',
+        originStationId: 'station1',
+        destinationStationId: 'station3',
+        isBoarded: false,
+        isDelivered: false,
+        isUrgent: false,
+      },
+    ]
+
+    // Change route but train still moving
+    rerender({ route: 2, passengers: newPassengers, position: 60 })
+
+    // Should STILL show old passengers (route 1)
+    expect(result.current.displayPassengers).toHaveLength(2)
+    expect(result.current.displayPassengers[0].id).toBe('p1')
+    expect(result.current.displayPassengers[0].name).toBe('Alice')
+  })
+
+  test('passengers update when train resets to start (negative position)', () => {
+    const { result, rerender } = renderHook(
+      ({ route, passengers, position }) =>
+        useTrackManagement({
+          currentRoute: route,
+          trainPosition: position,
+          trackGenerator: mockTrackGenerator,
+          pathRef: mockPathRef,
+          stations: mockStations,
+          passengers,
+          maxCars: 3,
+          carSpacing: 7,
+        }),
+      { initialProps: { route: 1, passengers: mockPassengers, position: 50 } }
+    )
+
+    // Initially route 1 passengers
+    expect(result.current.displayPassengers).toHaveLength(2)
+    expect(result.current.displayPassengers[0].id).toBe('p1')
+
+    // Generate new passengers for route 2
+    const newPassengers: Passenger[] = [
+      {
+        id: 'p3',
+        name: 'Charlie',
+        avatar: '👴',
+        originStationId: 'station1',
+        destinationStationId: 'station3',
+        isBoarded: false,
+        isDelivered: false,
+        isUrgent: false,
+      },
+    ]
+
+    // Change route and train resets
+    rerender({ route: 2, passengers: newPassengers, position: -5 })
+
+    // Should now show NEW passengers (route 2)
+    expect(result.current.displayPassengers).toHaveLength(1)
+    expect(result.current.displayPassengers[0].id).toBe('p3')
+    expect(result.current.displayPassengers[0].name).toBe('Charlie')
+  })
+
+  test('passengers do NOT flash when transitioning through 100%', () => {
+    const { result, rerender } = renderHook(
+      ({ route, passengers, position }) =>
+        useTrackManagement({
+          currentRoute: route,
+          trainPosition: position,
+          trackGenerator: mockTrackGenerator,
+          pathRef: mockPathRef,
+          stations: mockStations,
+          passengers,
+          maxCars: 3,
+          carSpacing: 7,
+        }),
+      { initialProps: { route: 1, passengers: mockPassengers, position: 95 } }
+    )
+
+    // At 95% - show route 1 passengers
+    expect(result.current.displayPassengers).toHaveLength(2)
+    expect(result.current.displayPassengers[0].id).toBe('p1')
+
+    // Generate new passengers for route 2
+    const newPassengers: Passenger[] = [
+      {
+        id: 'p3',
+        name: 'Charlie',
+        avatar: '👴',
+        originStationId: 'station1',
+        destinationStationId: 'station3',
+        isBoarded: false,
+        isDelivered: false,
+        isUrgent: false,
+      },
+    ]
+
+    // Train exits (105%) but route hasn't changed yet
+    rerender({ route: 1, passengers: mockPassengers, position: 105 })
+
+    // Should STILL show route 1 passengers
+    expect(result.current.displayPassengers).toHaveLength(2)
+    expect(result.current.displayPassengers[0].id).toBe('p1')
+
+    // Now route changes to 2, but train still at 105%
+    rerender({ route: 2, passengers: newPassengers, position: 105 })
+
+    // Should STILL show route 1 passengers (old ones)
+    expect(result.current.displayPassengers).toHaveLength(2)
+    expect(result.current.displayPassengers[0].id).toBe('p1')
+
+    // Train resets to start
+    rerender({ route: 2, passengers: newPassengers, position: -5 })
+
+    // NOW should show route 2 passengers
+    expect(result.current.displayPassengers).toHaveLength(1)
+    expect(result.current.displayPassengers[0].id).toBe('p3')
+  })
+
+  test('passengers do NOT update when array reference changes but same route', () => {
+    const { result, rerender } = renderHook(
+      ({ passengers, position }) =>
+        useTrackManagement({
+          currentRoute: 1,
+          trainPosition: position,
+          trackGenerator: mockTrackGenerator,
+          pathRef: mockPathRef,
+          stations: mockStations,
+          passengers,
+          maxCars: 3,
+          carSpacing: 7,
+        }),
+      { initialProps: { passengers: mockPassengers, position: 50 } }
+    )
+
+    // Initially route 1 passengers
+    expect(result.current.displayPassengers).toHaveLength(2)
+    expect(result.current.displayPassengers[0].id).toBe('p1')
+
+    // Create new array with same content (different reference)
+    const samePassengersNewRef = mockPassengers.map((p) => ({ ...p }))
+
+    // Update with new reference but same content
+    rerender({ passengers: samePassengersNewRef, position: 50 })
+
+    // Display should update because it's the same route (gameplay update)
+    expect(result.current.displayPassengers).toHaveLength(2)
+    expect(result.current.displayPassengers[0].id).toBe('p1')
+  })
+
+  test('delivered passengers update immediately (same route)', () => {
+    const { result, rerender } = renderHook(
+      ({ passengers, position }) =>
+        useTrackManagement({
+          currentRoute: 1,
+          trainPosition: position,
+          trackGenerator: mockTrackGenerator,
+          pathRef: mockPathRef,
+          stations: mockStations,
+          passengers,
+          maxCars: 3,
+          carSpacing: 7,
+        }),
+      { initialProps: { passengers: mockPassengers, position: 25 } }
+    )
+
+    // Initially 2 passengers, neither delivered
+    expect(result.current.displayPassengers).toHaveLength(2)
+    expect(result.current.displayPassengers[0].isDelivered).toBe(false)
+
+    // Deliver first passenger
+    const deliveredPassengers = mockPassengers.map((p) =>
+      p.id === 'p1' ? { ...p, isBoarded: true, isDelivered: true } : p
+    )
+
+    rerender({ passengers: deliveredPassengers, position: 55 })
+
+    // Should show updated passengers immediately
+    expect(result.current.displayPassengers).toHaveLength(2)
+    expect(result.current.displayPassengers[0].isDelivered).toBe(true)
+  })
+
+  test('multiple rapid passenger updates during same route', () => {
+    const { result, rerender } = renderHook(
+      ({ passengers, position }) =>
+        useTrackManagement({
+          currentRoute: 1,
+          trainPosition: position,
+          trackGenerator: mockTrackGenerator,
+          pathRef: mockPathRef,
+          stations: mockStations,
+          passengers,
+          maxCars: 3,
+          carSpacing: 7,
+        }),
+      { initialProps: { passengers: mockPassengers, position: 25 } }
+    )
+
+    // Initially 2 passengers
+    expect(result.current.displayPassengers).toHaveLength(2)
+
+    // Board p1
+    let updated = mockPassengers.map((p) => (p.id === 'p1' ? { ...p, isBoarded: true } : p))
+    rerender({ passengers: updated, position: 26 })
+    expect(result.current.displayPassengers[0].isBoarded).toBe(true)
+
+    // Board p2
+    updated = updated.map((p) => (p.id === 'p2' ? { ...p, isBoarded: true } : p))
+    rerender({ passengers: updated, position: 52 })
+    expect(result.current.displayPassengers[1].isBoarded).toBe(true)
+
+    // Deliver p1
+    updated = updated.map((p) => (p.id === 'p1' ? { ...p, isDelivered: true } : p))
+    rerender({ passengers: updated, position: 53 })
+    expect(result.current.displayPassengers[0].isDelivered).toBe(true)
+
+    // All updates should have been reflected
+    expect(result.current.displayPassengers[0].isBoarded).toBe(true)
+    expect(result.current.displayPassengers[0].isDelivered).toBe(true)
+    expect(result.current.displayPassengers[1].isBoarded).toBe(true)
+    expect(result.current.displayPassengers[1].isDelivered).toBe(false)
+  })
+
+  test('EDGE CASE: new passengers at position 0 with old route', () => {
+    const { result, rerender } = renderHook(
+      ({ route, passengers, position }) =>
+        useTrackManagement({
+          currentRoute: route,
+          trainPosition: position,
+          trackGenerator: mockTrackGenerator,
+          pathRef: mockPathRef,
+          stations: mockStations,
+          passengers,
+          maxCars: 3,
+          carSpacing: 7,
+        }),
+      { initialProps: { route: 1, passengers: mockPassengers, position: 95 } }
+    )
+
+    // At 95% - route 1 passengers
+    expect(result.current.displayPassengers[0].id).toBe('p1')
+
+    // Train exits tunnel
+    rerender({ route: 1, passengers: mockPassengers, position: 110 })
+    expect(result.current.displayPassengers[0].id).toBe('p1')
+
+    // New passengers generated but route hasn't changed yet, position resets to 0
+    const newPassengers: Passenger[] = [
+      {
+        id: 'p3',
+        name: 'Charlie',
+        avatar: '👴',
+        originStationId: 'station1',
+        destinationStationId: 'station3',
+        isBoarded: false,
+        isDelivered: false,
+        isUrgent: false,
+      },
+    ]
+
+    // CRITICAL: New passengers, old route, position = 0
+    // This could trigger the second useEffect if not handled carefully
+    rerender({ route: 1, passengers: newPassengers, position: 0 })
+
+    // Should NOT show new passengers yet (route hasn't changed)
+    // But position is 0-100, so second effect might fire
+    expect(result.current.displayPassengers[0].id).toBe('p1')
+    expect(result.current.displayPassengers[0].name).toBe('Alice')
+  })
+
+  test('EDGE CASE: passengers regenerated at position 5%', () => {
+    const { result, rerender } = renderHook(
+      ({ route, passengers, position }) =>
+        useTrackManagement({
+          currentRoute: route,
+          trainPosition: position,
+          trackGenerator: mockTrackGenerator,
+          pathRef: mockPathRef,
+          stations: mockStations,
+          passengers,
+          maxCars: 3,
+          carSpacing: 7,
+        }),
+      { initialProps: { route: 1, passengers: mockPassengers, position: 95 } }
+    )
+
+    // At 95% - route 1 passengers
+    expect(result.current.displayPassengers[0].id).toBe('p1')
+
+    // New passengers generated while train is at 5%
+    const newPassengers: Passenger[] = [
+      {
+        id: 'p3',
+        name: 'Charlie',
+        avatar: '👴',
+        originStationId: 'station1',
+        destinationStationId: 'station3',
+        isBoarded: false,
+        isDelivered: false,
+        isUrgent: false,
+      },
+    ]
+
+    // CRITICAL: New passengers array, same route, position within 0-100
+    rerender({ route: 1, passengers: newPassengers, position: 5 })
+
+    // Should NOT show new passengers (different array reference, route hasn't changed properly)
+    expect(result.current.displayPassengers[0].id).toBe('p1')
+  })
+
+  test('EDGE CASE: rapid route increment with position oscillation', () => {
+    const { result, rerender } = renderHook(
+      ({ route, passengers, position }) =>
+        useTrackManagement({
+          currentRoute: route,
+          trainPosition: position,
+          trackGenerator: mockTrackGenerator,
+          pathRef: mockPathRef,
+          stations: mockStations,
+          passengers,
+          maxCars: 3,
+          carSpacing: 7,
+        }),
+      { initialProps: { route: 1, passengers: mockPassengers, position: 50 } }
+    )
+
+    expect(result.current.displayPassengers[0].id).toBe('p1')
+
+    const route2Passengers: Passenger[] = [
+      {
+        id: 'p3',
+        name: 'Charlie',
+        avatar: '👴',
+        originStationId: 'station1',
+        destinationStationId: 'station3',
+        isBoarded: false,
+        isDelivered: false,
+        isUrgent: false,
+      },
+    ]
+
+    // Route changes, position goes positive briefly before negative
+    rerender({ route: 2, passengers: route2Passengers, position: 2 })
+
+    // Should still show old passengers
+    expect(result.current.displayPassengers[0].id).toBe('p1')
+
+    // Position goes negative
+    rerender({ route: 2, passengers: route2Passengers, position: -3 })
+
+    // NOW should show new passengers
+    expect(result.current.displayPassengers[0].id).toBe('p3')
+  })
+})
--- a/apps/web/src/app/arcade/complement-race/hooks/tests/useTrackManagement.test.ts
+++ b/apps/web/src/app/arcade/complement-race/hooks/tests/useTrackManagement.test.ts
@@ -0,0 +1,362 @@
+import { renderHook } from '@testing-library/react'
+import { beforeEach, describe, expect, test, vi } from 'vitest'
+import type { Passenger, Station } from '../../lib/gameTypes'
+import type { RailroadTrackGenerator } from '../../lib/RailroadTrackGenerator'
+import { useTrackManagement } from '../useTrackManagement'
+
+// Mock the landmarks module
+vi.mock('../../lib/landmarks', () => ({
+  generateLandmarks: vi.fn((_route: number) => [
+    { emoji: '🌲', position: 30, offset: { x: 0, y: -50 }, size: 24 },
+    { emoji: '🏔️', position: 70, offset: { x: 0, y: -80 }, size: 32 },
+  ]),
+}))
+
+describe('useTrackManagement', () => {
+  let mockPathRef: React.RefObject<SVGPathElement>
+  let mockTrackGenerator: RailroadTrackGenerator
+  let mockStations: Station[]
+  let mockPassengers: Passenger[]
+
+  beforeEach(() => {
+    // Create mock path element
+    const mockPath = document.createElementNS('http://www.w3.org/2000/svg', 'path')
+    mockPath.getTotalLength = vi.fn(() => 1000)
+    mockPath.getPointAtLength = vi.fn((distance: number) => ({
+      x: distance,
+      y: 300,
+    }))
+    mockPathRef = { current: mockPath }
+
+    // Mock track generator
+    mockTrackGenerator = {
+      generateTrack: vi.fn((route: number) => ({
+        referencePath: `M 0 300 L ${route * 100} 300`,
+        ballastPath: `M 0 300 L ${route * 100} 300`,
+      })),
+      generateTiesAndRails: vi.fn(() => ({
+        ties: [
+          { x1: 0, y1: 300, x2: 10, y2: 300 },
+          { x1: 20, y1: 300, x2: 30, y2: 300 },
+        ],
+        leftRailPoints: ['0,295', '100,295'],
+        rightRailPoints: ['0,305', '100,305'],
+      })),
+    } as unknown as RailroadTrackGenerator
+
+    mockStations = [
+      { id: 'station-1', name: 'Station 1', position: 20, icon: '🏭' },
+      { id: 'station-2', name: 'Station 2', position: 60, icon: '🏛️' },
+    ]
+
+    mockPassengers = [
+      {
+        id: 'passenger-1',
+        avatar: '👨',
+        originStationId: 'station-1',
+        destinationStationId: 'station-2',
+        isBoarded: false,
+        isDelivered: false,
+        isUrgent: false,
+      },
+    ]
+
+    vi.clearAllMocks()
+  })
+
+  test('initializes with null trackData', () => {
+    const { result } = renderHook(() =>
+      useTrackManagement({
+        currentRoute: 1,
+        trainPosition: 0,
+        trackGenerator: mockTrackGenerator,
+        pathRef: mockPathRef,
+        stations: mockStations,
+        passengers: mockPassengers,
+      })
+    )
+
+    // Track data should be generated
+    expect(result.current.trackData).toBeDefined()
+    expect(mockTrackGenerator.generateTrack).toHaveBeenCalledWith(1)
+  })
+
+  test('generates landmarks for current route', () => {
+    const { result } = renderHook(() =>
+      useTrackManagement({
+        currentRoute: 1,
+        trainPosition: 0,
+        trackGenerator: mockTrackGenerator,
+        pathRef: mockPathRef,
+        stations: mockStations,
+        passengers: mockPassengers,
+      })
+    )
+
+    expect(result.current.landmarks).toHaveLength(2)
+    expect(result.current.landmarks[0].emoji).toBe('🌲')
+    expect(result.current.landmarks[1].emoji).toBe('🏔️')
+  })
+
+  test('generates ties and rails when path is ready', () => {
+    const { result } = renderHook(() =>
+      useTrackManagement({
+        currentRoute: 1,
+        trainPosition: 0,
+        trackGenerator: mockTrackGenerator,
+        pathRef: mockPathRef,
+        stations: mockStations,
+        passengers: mockPassengers,
+      })
+    )
+
+    expect(result.current.tiesAndRails).toBeDefined()
+    expect(result.current.tiesAndRails?.ties).toHaveLength(2)
+  })
+
+  test('calculates station positions along path', () => {
+    const { result } = renderHook(() =>
+      useTrackManagement({
+        currentRoute: 1,
+        trainPosition: 0,
+        trackGenerator: mockTrackGenerator,
+        pathRef: mockPathRef,
+        stations: mockStations,
+        passengers: mockPassengers,
+      })
+    )
+
+    expect(result.current.stationPositions).toHaveLength(2)
+    // Station 1 at 20% of 1000 = 200
+    expect(result.current.stationPositions[0].x).toBe(200)
+    // Station 2 at 60% of 1000 = 600
+    expect(result.current.stationPositions[1].x).toBe(600)
+  })
+
+  test('calculates landmark positions along path', () => {
+    const { result } = renderHook(() =>
+      useTrackManagement({
+        currentRoute: 1,
+        trainPosition: 0,
+        trackGenerator: mockTrackGenerator,
+        pathRef: mockPathRef,
+        stations: mockStations,
+        passengers: mockPassengers,
+      })
+    )
+
+    expect(result.current.landmarkPositions).toHaveLength(2)
+    // First landmark at 30% + offset
+    expect(result.current.landmarkPositions[0].x).toBe(300) // 30% of 1000
+    expect(result.current.landmarkPositions[0].y).toBe(250) // 300 + (-50)
+  })
+
+  test('delays track update when changing routes mid-journey', () => {
+    const { result, rerender } = renderHook(
+      ({ route, position }) =>
+        useTrackManagement({
+          currentRoute: route,
+          trainPosition: position,
+          trackGenerator: mockTrackGenerator,
+          pathRef: mockPathRef,
+          stations: mockStations,
+          passengers: mockPassengers,
+        }),
+      {
+        initialProps: { route: 1, position: 0 },
+      }
+    )
+
+    const initialTrackData = result.current.trackData
+
+    // Change route while train is mid-journey (position > 0)
+    rerender({ route: 2, position: 50 })
+
+    // Track should NOT update yet (pending)
+    expect(result.current.trackData).toBe(initialTrackData)
+    expect(mockTrackGenerator.generateTrack).toHaveBeenCalledWith(2)
+  })
+
+  test('applies pending track when train resets to beginning', () => {
+    const { result, rerender } = renderHook(
+      ({ route, position }) =>
+        useTrackManagement({
+          currentRoute: route,
+          trainPosition: position,
+          trackGenerator: mockTrackGenerator,
+          pathRef: mockPathRef,
+          stations: mockStations,
+          passengers: mockPassengers,
+        }),
+      {
+        initialProps: { route: 1, position: 0 },
+      }
+    )
+
+    // Change route while train is mid-journey
+    rerender({ route: 2, position: 50 })
+    const trackDataBeforeReset = result.current.trackData
+
+    // Train resets to beginning (position < 0)
+    rerender({ route: 2, position: -5 })
+
+    // Track should now update
+    expect(result.current.trackData).not.toBe(trackDataBeforeReset)
+  })
+
+  test('immediately applies new track when train is at start', () => {
+    const { result, rerender } = renderHook(
+      ({ route, position }) =>
+        useTrackManagement({
+          currentRoute: route,
+          trainPosition: position,
+          trackGenerator: mockTrackGenerator,
+          pathRef: mockPathRef,
+          stations: mockStations,
+          passengers: mockPassengers,
+        }),
+      {
+        initialProps: { route: 1, position: -5 },
+      }
+    )
+
+    const initialTrackData = result.current.trackData
+
+    // Change route while train is at start (position < 0)
+    rerender({ route: 2, position: -5 })
+
+    // Track should update immediately
+    expect(result.current.trackData).not.toBe(initialTrackData)
+  })
+
+  test('delays passenger display update until all cars exit', () => {
+    const newPassengers: Passenger[] = [
+      {
+        id: 'passenger-2',
+        avatar: '👩',
+        originStationId: 'station-1',
+        destinationStationId: 'station-2',
+        isBoarded: false,
+        isDelivered: false,
+        isUrgent: false,
+      },
+    ]
+
+    const { result, rerender } = renderHook(
+      ({ passengers, position }) =>
+        useTrackManagement({
+          currentRoute: 1,
+          trainPosition: position,
+          trackGenerator: mockTrackGenerator,
+          pathRef: mockPathRef,
+          stations: mockStations,
+          passengers,
+          maxCars: 5,
+          carSpacing: 7,
+        }),
+      {
+        initialProps: { passengers: mockPassengers, position: 50 },
+      }
+    )
+
+    expect(result.current.displayPassengers).toBe(mockPassengers)
+
+    // Change passengers while train is mid-journey
+    // Locomotive at 100%, but last car at 100 - (5*7) = 65%
+    rerender({ passengers: newPassengers, position: 100 })
+
+    // Display passengers should NOT update yet (last car hasn't exited)
+    expect(result.current.displayPassengers).toBe(mockPassengers)
+  })
+
+  test('does not update passenger display until train resets', () => {
+    const newPassengers: Passenger[] = [
+      {
+        id: 'passenger-2',
+        avatar: '👩',
+        originStationId: 'station-1',
+        destinationStationId: 'station-2',
+        isBoarded: false,
+        isDelivered: false,
+        isUrgent: false,
+      },
+    ]
+
+    const { result, rerender } = renderHook(
+      ({ passengers, position }) =>
+        useTrackManagement({
+          currentRoute: 1,
+          trainPosition: position,
+          trackGenerator: mockTrackGenerator,
+          pathRef: mockPathRef,
+          stations: mockStations,
+          passengers,
+          maxCars: 5,
+          carSpacing: 7,
+        }),
+      {
+        initialProps: { passengers: mockPassengers, position: 50 },
+      }
+    )
+
+    // Change passengers, locomotive at position where all cars have exited
+    // Last car exits at position 97%, so locomotive at 132%
+    rerender({ passengers: newPassengers, position: 132 })
+
+    // Display passengers should NOT update yet (waiting for train reset)
+    expect(result.current.displayPassengers).toBe(mockPassengers)
+
+    // Now train resets to beginning
+    rerender({ passengers: newPassengers, position: -5 })
+
+    // Display passengers should update now (train reset)
+    expect(result.current.displayPassengers).toBe(newPassengers)
+  })
+
+  test('updates passengers immediately during same route', () => {
+    const updatedPassengers: Passenger[] = [{ ...mockPassengers[0], isBoarded: true }]
+
+    const { result, rerender } = renderHook(
+      ({ passengers, position }) =>
+        useTrackManagement({
+          currentRoute: 1,
+          trainPosition: position,
+          trackGenerator: mockTrackGenerator,
+          pathRef: mockPathRef,
+          stations: mockStations,
+          passengers,
+          maxCars: 5,
+          carSpacing: 7,
+        }),
+      {
+        initialProps: { passengers: mockPassengers, position: 50 },
+      }
+    )
+
+    // Update passengers (boarding) during same route
+    rerender({ passengers: updatedPassengers, position: 55 })
+
+    // Display passengers should update immediately (same route, gameplay update)
+    expect(result.current.displayPassengers).toBe(updatedPassengers)
+  })
+
+  test('returns null when no track data', () => {
+    // Create a hook where trackGenerator returns null
+    const nullTrackGenerator = {
+      generateTrack: vi.fn(() => null),
+    } as unknown as RailroadTrackGenerator
+
+    const { result } = renderHook(() =>
+      useTrackManagement({
+        currentRoute: 1,
+        trainPosition: 0,
+        trackGenerator: nullTrackGenerator,
+        pathRef: mockPathRef,
+        stations: mockStations,
+        passengers: mockPassengers,
+      })
+    )
+
+    expect(result.current.trackData).toBeNull()
+  })
+})
--- a/apps/web/src/app/arcade/complement-race/hooks/tests/useTrainTransforms.test.ts
+++ b/apps/web/src/app/arcade/complement-race/hooks/tests/useTrainTransforms.test.ts
@@ -0,0 +1,298 @@
+import { renderHook } from '@testing-library/react'
+import { beforeEach, describe, expect, test, vi } from 'vitest'
+import type { RailroadTrackGenerator } from '../../lib/RailroadTrackGenerator'
+import { useTrainTransforms } from '../useTrainTransforms'
+
+describe('useTrainTransforms', () => {
+  let mockPathRef: React.RefObject<SVGPathElement>
+  let mockTrackGenerator: RailroadTrackGenerator
+
+  beforeEach(() => {
+    // Create mock path element
+    const mockPath = document.createElementNS('http://www.w3.org/2000/svg', 'path')
+    mockPathRef = { current: mockPath }
+
+    // Mock track generator
+    mockTrackGenerator = {
+      getTrainTransform: vi.fn((_path: SVGPathElement, position: number) => ({
+        x: position * 10,
+        y: 300,
+        rotation: position / 10,
+      })),
+    } as unknown as RailroadTrackGenerator
+
+    vi.clearAllMocks()
+  })
+
+  test('returns default transform when pathRef is null', () => {
+    const nullPathRef: React.RefObject<SVGPathElement> = { current: null }
+
+    const { result } = renderHook(() =>
+      useTrainTransforms({
+        trainPosition: 50,
+        trackGenerator: mockTrackGenerator,
+        pathRef: nullPathRef,
+        maxCars: 5,
+        carSpacing: 7,
+      })
+    )
+
+    expect(result.current.trainTransform).toEqual({ x: 50, y: 300, rotation: 0 })
+    expect(result.current.trainCars).toHaveLength(5)
+  })
+
+  test('calculates train transform at given position', () => {
+    const { result } = renderHook(() =>
+      useTrainTransforms({
+        trainPosition: 50,
+        trackGenerator: mockTrackGenerator,
+        pathRef: mockPathRef,
+        maxCars: 5,
+        carSpacing: 7,
+      })
+    )
+
+    expect(result.current.trainTransform).toEqual({
+      x: 500, // 50 * 10
+      y: 300,
+      rotation: 5, // 50 / 10
+    })
+  })
+
+  test('updates transform when train position changes', () => {
+    const { result, rerender } = renderHook(
+      ({ position }) =>
+        useTrainTransforms({
+          trainPosition: position,
+          trackGenerator: mockTrackGenerator,
+          pathRef: mockPathRef,
+          maxCars: 5,
+          carSpacing: 7,
+        }),
+      { initialProps: { position: 20 } }
+    )
+
+    expect(result.current.trainTransform.x).toBe(200)
+
+    rerender({ position: 60 })
+    expect(result.current.trainTransform.x).toBe(600)
+  })
+
+  test('calculates correct number of train cars', () => {
+    const { result } = renderHook(() =>
+      useTrainTransforms({
+        trainPosition: 50,
+        trackGenerator: mockTrackGenerator,
+        pathRef: mockPathRef,
+        maxCars: 5,
+        carSpacing: 7,
+      })
+    )
+
+    expect(result.current.trainCars).toHaveLength(5)
+  })
+
+  test('respects custom maxCars parameter', () => {
+    const { result } = renderHook(() =>
+      useTrainTransforms({
+        trainPosition: 50,
+        trackGenerator: mockTrackGenerator,
+        pathRef: mockPathRef,
+        maxCars: 3,
+        carSpacing: 7,
+      })
+    )
+
+    expect(result.current.trainCars).toHaveLength(3)
+  })
+
+  test('respects custom carSpacing parameter', () => {
+    const { result } = renderHook(() =>
+      useTrainTransforms({
+        trainPosition: 50,
+        trackGenerator: mockTrackGenerator,
+        pathRef: mockPathRef,
+        maxCars: 5,
+        carSpacing: 10,
+      })
+    )
+
+    // First car should be at position 50 - 10 = 40
+    expect(result.current.trainCars[0].position).toBe(40)
+  })
+
+  test('positions cars behind locomotive with correct spacing', () => {
+    const { result } = renderHook(() =>
+      useTrainTransforms({
+        trainPosition: 50,
+        trackGenerator: mockTrackGenerator,
+        pathRef: mockPathRef,
+        maxCars: 3,
+        carSpacing: 10,
+      })
+    )
+
+    expect(result.current.trainCars[0].position).toBe(40) // 50 - 1*10
+    expect(result.current.trainCars[1].position).toBe(30) // 50 - 2*10
+    expect(result.current.trainCars[2].position).toBe(20) // 50 - 3*10
+  })
+
+  test('calculates locomotive opacity correctly during fade in', () => {
+    // Fade in range: 3-8%
+    const { result: result1 } = renderHook(() =>
+      useTrainTransforms({
+        trainPosition: 3,
+        trackGenerator: mockTrackGenerator,
+        pathRef: mockPathRef,
+        maxCars: 5,
+        carSpacing: 7,
+      })
+    )
+    expect(result1.current.locomotiveOpacity).toBe(0)
+
+    const { result: result2 } = renderHook(() =>
+      useTrainTransforms({
+        trainPosition: 5.5, // Midpoint between 3 and 8
+        trackGenerator: mockTrackGenerator,
+        pathRef: mockPathRef,
+        maxCars: 5,
+        carSpacing: 7,
+      })
+    )
+    expect(result2.current.locomotiveOpacity).toBe(0.5)
+
+    const { result: result3 } = renderHook(() =>
+      useTrainTransforms({
+        trainPosition: 8,
+        trackGenerator: mockTrackGenerator,
+        pathRef: mockPathRef,
+        maxCars: 5,
+        carSpacing: 7,
+      })
+    )
+    expect(result3.current.locomotiveOpacity).toBe(1)
+  })
+
+  test('calculates locomotive opacity correctly during fade out', () => {
+    // Fade out range: 92-97%
+    const { result: result1 } = renderHook(() =>
+      useTrainTransforms({
+        trainPosition: 92,
+        trackGenerator: mockTrackGenerator,
+        pathRef: mockPathRef,
+        maxCars: 5,
+        carSpacing: 7,
+      })
+    )
+    expect(result1.current.locomotiveOpacity).toBe(1)
+
+    const { result: result2 } = renderHook(() =>
+      useTrainTransforms({
+        trainPosition: 94.5, // Midpoint between 92 and 97
+        trackGenerator: mockTrackGenerator,
+        pathRef: mockPathRef,
+        maxCars: 5,
+        carSpacing: 7,
+      })
+    )
+    expect(result2.current.locomotiveOpacity).toBe(0.5)
+
+    const { result: result3 } = renderHook(() =>
+      useTrainTransforms({
+        trainPosition: 97,
+        trackGenerator: mockTrackGenerator,
+        pathRef: mockPathRef,
+        maxCars: 5,
+        carSpacing: 7,
+      })
+    )
+    expect(result3.current.locomotiveOpacity).toBe(0)
+  })
+
+  test('locomotive is fully visible in middle of track', () => {
+    const { result } = renderHook(() =>
+      useTrainTransforms({
+        trainPosition: 50,
+        trackGenerator: mockTrackGenerator,
+        pathRef: mockPathRef,
+        maxCars: 5,
+        carSpacing: 7,
+      })
+    )
+
+    expect(result.current.locomotiveOpacity).toBe(1)
+  })
+
+  test('calculates car opacity independently for each car', () => {
+    const { result } = renderHook(() =>
+      useTrainTransforms({
+        trainPosition: 10, // Locomotive at 10%, first car at 3% (fading in)
+        trackGenerator: mockTrackGenerator,
+        pathRef: mockPathRef,
+        maxCars: 2,
+        carSpacing: 7,
+      })
+    )
+
+    // First car at position 3 should be starting to fade in
+    expect(result.current.trainCars[0].position).toBe(3)
+    expect(result.current.trainCars[0].opacity).toBe(0)
+
+    // Second car at position -4 should be invisible (not yet entered)
+    expect(result.current.trainCars[1].position).toBe(0) // clamped to 0
+    expect(result.current.trainCars[1].opacity).toBe(0)
+  })
+
+  test('car positions cannot go below zero', () => {
+    const { result } = renderHook(() =>
+      useTrainTransforms({
+        trainPosition: 5,
+        trackGenerator: mockTrackGenerator,
+        pathRef: mockPathRef,
+        maxCars: 3,
+        carSpacing: 7,
+      })
+    )
+
+    // First car at 5 - 7 = -2, should be clamped to 0
+    expect(result.current.trainCars[0].position).toBe(0)
+    // Second car at 5 - 14 = -9, should be clamped to 0
+    expect(result.current.trainCars[1].position).toBe(0)
+  })
+
+  test('cars fade out completely past 97%', () => {
+    const { result } = renderHook(() =>
+      useTrainTransforms({
+        trainPosition: 104, // Last car at 104 - 35 = 69% (5 cars * 7 spacing)
+        trackGenerator: mockTrackGenerator,
+        pathRef: mockPathRef,
+        maxCars: 5,
+        carSpacing: 7,
+      })
+    )
+
+    const lastCar = result.current.trainCars[4]
+    expect(lastCar.position).toBe(69)
+    expect(lastCar.opacity).toBe(1) // Still visible, not past 97%
+  })
+
+  test('memoizes car transforms to avoid recalculation on same inputs', () => {
+    const { result, rerender } = renderHook(() =>
+      useTrainTransforms({
+        trainPosition: 50,
+        trackGenerator: mockTrackGenerator,
+        pathRef: mockPathRef,
+        maxCars: 5,
+        carSpacing: 7,
+      })
+    )
+
+    const firstCars = result.current.trainCars
+
+    // Rerender with same props
+    rerender()
+
+    // Should be the exact same array reference (memoized)
+    expect(result.current.trainCars).toBe(firstCars)
+  })
+})
--- a/apps/web/src/app/arcade/complement-race/hooks/useAIRacers.ts
+++ b/apps/web/src/app/arcade/complement-race/hooks/useAIRacers.ts
@@ -0,0 +1,126 @@
+import { useEffect } from 'react'
+import { type CommentaryContext, getAICommentary } from '../components/AISystem/aiCommentary'
+import { useComplementRace } from '../context/ComplementRaceContext'
+import { useSoundEffects } from './useSoundEffects'
+
+export function useAIRacers() {
+  const { state, dispatch } = useComplementRace()
+  const { playSound } = useSoundEffects()
+
+  useEffect(() => {
+    if (!state.isGameActive) return
+
+    // Update AI positions every 200ms (line 11690)
+    const aiUpdateInterval = setInterval(() => {
+      const newPositions = state.aiRacers.map((racer) => {
+        // Base speed with random variance (0.6-1.4 range via Math.random() * 0.8 + 0.6)
+        const variance = Math.random() * 0.8 + 0.6
+        let speed = racer.speed * variance * state.speedMultiplier
+
+        // Rubber-banding: AI speeds up 2x when >10 units behind player (line 11697-11699)
+        const distanceBehind = state.correctAnswers - racer.position
+        if (distanceBehind > 10) {
+          speed *= 2
+        }
+
+        // Update position
+        const newPosition = racer.position + speed
+
+        return {
+          id: racer.id,
+          position: newPosition,
+        }
+      })
+
+      dispatch({ type: 'UPDATE_AI_POSITIONS', positions: newPositions })
+
+      // Check for AI win in practice mode (line 14151)
+      if (state.style === 'practice' && state.isGameActive) {
+        const winningAI = state.aiRacers.find((racer, index) => {
+          const updatedPosition = newPositions[index]?.position || racer.position
+          return updatedPosition >= state.raceGoal
+        })
+
+        if (winningAI) {
+          // Play game over sound (line 14193)
+          playSound('gameOver')
+          // End the game
+          dispatch({ type: 'END_RACE' })
+          // Show results after a short delay
+          setTimeout(() => {
+            dispatch({ type: 'SHOW_RESULTS' })
+          }, 1500)
+          return // Exit early to prevent further updates
+        }
+      }
+
+      // Check for commentary triggers after position updates
+      state.aiRacers.forEach((racer) => {
+        const updatedPosition =
+          newPositions.find((p) => p.id === racer.id)?.position || racer.position
+        const distanceBehind = state.correctAnswers - updatedPosition
+        const distanceAhead = updatedPosition - state.correctAnswers
+
+        // Detect passing events
+        const playerJustPassed =
+          racer.previousPosition > state.correctAnswers && updatedPosition < state.correctAnswers
+        const aiJustPassed =
+          racer.previousPosition < state.correctAnswers && updatedPosition > state.correctAnswers
+
+        // Determine commentary context
+        let context: CommentaryContext | null = null
+
+        if (playerJustPassed) {
+          context = 'player_passed'
+        } else if (aiJustPassed) {
+          context = 'ai_passed'
+        } else if (distanceBehind > 20) {
+          // Player has lapped the AI (more than 20 units behind)
+          context = 'lapped'
+        } else if (distanceBehind > 10) {
+          // AI is desperate to catch up (rubber-banding active)
+          context = 'desperate_catchup'
+        } else if (distanceAhead > 5) {
+          // AI is significantly ahead
+          context = 'ahead'
+        } else if (distanceBehind > 3) {
+          // AI is behind
+          context = 'behind'
+        }
+
+        // Trigger commentary if context is valid
+        if (context) {
+          const message = getAICommentary(racer, context, state.correctAnswers, updatedPosition)
+          if (message) {
+            dispatch({
+              type: 'TRIGGER_AI_COMMENTARY',
+              racerId: racer.id,
+              message,
+              context,
+            })
+
+            // Play special turbo sound when AI goes desperate (line 11941)
+            if (context === 'desperate_catchup') {
+              playSound('ai_turbo', 0.12)
+            }
+          }
+        }
+      })
+    }, 200)
+
+    return () => clearInterval(aiUpdateInterval)
+  }, [
+    state.isGameActive,
+    state.aiRacers,
+    state.correctAnswers,
+    state.speedMultiplier,
+    dispatch, // Play game over sound (line 14193)
+    playSound,
+    state.raceGoal,
+    state.style,
+  ])
+
+  return {
+    aiRacers: state.aiRacers,
+  }
+}
--- a/apps/web/src/app/arcade/complement-race/hooks/useAdaptiveDifficulty.ts
+++ b/apps/web/src/app/arcade/complement-race/hooks/useAdaptiveDifficulty.ts
@@ -0,0 +1,345 @@
+import { useComplementRace } from '../context/ComplementRaceContext'
+import type { PairPerformance } from '../lib/gameTypes'
+
+export function useAdaptiveDifficulty() {
+  const { state, dispatch } = useComplementRace()
+
+  // Track performance after each answer (lines 14495-14553)
+  const trackPerformance = (isCorrect: boolean, responseTime: number) => {
+    if (!state.currentQuestion) return
+
+    const pairKey = `${state.currentQuestion.number}_${state.currentQuestion.correctAnswer}_${state.currentQuestion.targetSum}`
+
+    // Get or create performance data for this pair
+    const pairData: PairPerformance = state.difficultyTracker.pairPerformance.get(pairKey) || {
+      attempts: 0,
+      correct: 0,
+      avgTime: 0,
+      difficulty: 1,
+    }
+
+    // Update performance data
+    pairData.attempts++
+    if (isCorrect) {
+      pairData.correct++
+    }
+
+    // Update average time (rolling average)
+    const totalTime = pairData.avgTime * (pairData.attempts - 1) + responseTime
+    pairData.avgTime = totalTime / pairData.attempts
+
+    // Calculate pair-specific difficulty (lines 14555-14576)
+    if (pairData.attempts >= 2) {
+      const accuracyRate = pairData.correct / pairData.attempts
+      const avgTime = pairData.avgTime
+
+      let difficulty = 1
+      if (accuracyRate >= 0.9 && avgTime < 1500) {
+        difficulty = 1 // Very easy
+      } else if (accuracyRate >= 0.8 && avgTime < 2000) {
+        difficulty = 2 // Easy
+      } else if (accuracyRate >= 0.7 || avgTime < 2500) {
+        difficulty = 3 // Medium
+      } else if (accuracyRate >= 0.5 || avgTime < 3500) {
+        difficulty = 4 // Hard
+      } else {
+        difficulty = 5 // Very hard
+      }
+
+      pairData.difficulty = difficulty
+    }
+
+    // Update difficulty tracker in state
+    const newPairPerformance = new Map(state.difficultyTracker.pairPerformance)
+    newPairPerformance.set(pairKey, pairData)
+
+    // Update consecutive counters
+    const newTracker = {
+      ...state.difficultyTracker,
+      pairPerformance: newPairPerformance,
+      consecutiveCorrect: isCorrect ? state.difficultyTracker.consecutiveCorrect + 1 : 0,
+      consecutiveIncorrect: !isCorrect ? state.difficultyTracker.consecutiveIncorrect + 1 : 0,
+    }
+
+    // Adapt global difficulty (lines 14578-14605)
+    if (newTracker.consecutiveCorrect >= 3) {
+      // Reduce time limit (increase difficulty)
+      newTracker.currentTimeLimit = Math.max(
+        1000,
+        newTracker.currentTimeLimit - newTracker.currentTimeLimit * newTracker.adaptationRate
+      )
+    } else if (newTracker.consecutiveIncorrect >= 2) {
+      // Increase time limit (decrease difficulty)
+      newTracker.currentTimeLimit = Math.min(
+        5000,
+        newTracker.currentTimeLimit + newTracker.baseTimeLimit * newTracker.adaptationRate
+      )
+    }
+
+    // Update overall difficulty level
+    const avgDifficulty =
+      Array.from(newTracker.pairPerformance.values()).reduce(
+        (sum, data) => sum + data.difficulty,
+        0
+      ) / Math.max(1, newTracker.pairPerformance.size)
+
+    newTracker.difficultyLevel = Math.round(avgDifficulty)
+
+    // Exit learning mode after sufficient data (lines 14548-14552)
+    if (
+      newTracker.pairPerformance.size >= 5 &&
+      Array.from(newTracker.pairPerformance.values()).some((data) => data.attempts >= 3)
+    ) {
+      newTracker.learningMode = false
+    }
+
+    // Dispatch update
+    dispatch({ type: 'UPDATE_DIFFICULTY_TRACKER', tracker: newTracker })
+
+    // Adapt AI speeds based on player performance
+    adaptAISpeeds(newTracker)
+  }
+
+  // Calculate recent success rate (lines 14685-14693)
+  const calculateRecentSuccessRate = (): number => {
+    const recentQuestions = Math.min(10, state.totalQuestions)
+    if (recentQuestions === 0) return 0.5 // Default for first question
+
+    // Use global tracking for recent performance
+    const recentCorrect = Math.max(
+      0,
+      state.correctAnswers - Math.max(0, state.totalQuestions - recentQuestions)
+    )
+    return recentCorrect / recentQuestions
+  }
+
+  // Calculate average response time (lines 14695-14705)
+  const calculateAverageResponseTime = (): number => {
+    const recentPairs = Array.from(state.difficultyTracker.pairPerformance.values())
+      .filter((data) => data.attempts >= 1)
+      .slice(-5) // Last 5 different pairs encountered
+
+    if (recentPairs.length === 0) return 3000 // Default for learning mode
+
+    const totalTime = recentPairs.reduce((sum, data) => sum + data.avgTime, 0)
+    return totalTime / recentPairs.length
+  }
+
+  // Adapt AI speeds based on performance (lines 14607-14683)
+  const adaptAISpeeds = (tracker: typeof state.difficultyTracker) => {
+    // Don't adapt during learning mode
+    if (tracker.learningMode) return
+
+    const playerSuccessRate = calculateRecentSuccessRate()
+    const avgResponseTime = calculateAverageResponseTime()
+
+    // Base speed multipliers for each race mode
+    let baseSpeedMultiplier: number
+    switch (state.style) {
+      case 'practice':
+        baseSpeedMultiplier = 0.7
+        break
+      case 'sprint':
+        baseSpeedMultiplier = 0.9
+        break
+      case 'survival':
+        baseSpeedMultiplier = state.speedMultiplier * state.survivalMultiplier
+        break
+      default:
+        baseSpeedMultiplier = 0.7
+    }
+
+    // Calculate adaptive multiplier based on player performance
+    let adaptiveMultiplier = 1.0
+
+    // Success rate factor (0.5x to 1.6x based on success rate)
+    if (playerSuccessRate > 0.85) {
+      adaptiveMultiplier *= 1.6 // Player doing great - speed up AI significantly
+    } else if (playerSuccessRate > 0.75) {
+      adaptiveMultiplier *= 1.3 // Player doing well - speed up AI moderately
+    } else if (playerSuccessRate > 0.6) {
+      adaptiveMultiplier *= 1.0 // Player doing okay - keep AI at base speed
+    } else if (playerSuccessRate > 0.45) {
+      adaptiveMultiplier *= 0.75 // Player struggling - slow down AI
+    } else {
+      adaptiveMultiplier *= 0.5 // Player really struggling - significantly slow AI
+    }
+
+    // Response time factor - faster players get faster AI
+    if (avgResponseTime < 1500) {
+      adaptiveMultiplier *= 1.2 // Very fast player
+    } else if (avgResponseTime < 2500) {
+      adaptiveMultiplier *= 1.1 // Fast player
+    } else if (avgResponseTime > 4000) {
+      adaptiveMultiplier *= 0.9 // Slow player
+    }
+
+    // Streak bonus - players on hot streaks get more challenge
+    if (state.streak >= 8) {
+      adaptiveMultiplier *= 1.3
+    } else if (state.streak >= 5) {
+      adaptiveMultiplier *= 1.15
+    }
+
+    // Apply bounds to prevent extreme values
+    adaptiveMultiplier = Math.max(0.3, Math.min(2.0, adaptiveMultiplier))
+
+    // Update AI speeds with adaptive multiplier
+    const finalSpeedMultiplier = baseSpeedMultiplier * adaptiveMultiplier
+
+    // Update AI racer speeds
+    const updatedRacers = state.aiRacers.map((racer, index) => {
+      if (index === 0) {
+        // Swift AI (more aggressive)
+        return { ...racer, speed: 0.32 * finalSpeedMultiplier }
+      } else {
+        // Math Bot (more consistent)
+        return { ...racer, speed: 0.2 * finalSpeedMultiplier }
+      }
+    })
+
+    dispatch({ type: 'UPDATE_AI_SPEEDS', racers: updatedRacers })
+
+    // Debug logging for AI adaptation (every 5 questions)
+    if (state.totalQuestions % 5 === 0) {
+      console.log('🤖 AI Speed Adaptation:', {
+        playerSuccessRate: `${Math.round(playerSuccessRate * 100)}%`,
+        avgResponseTime: `${Math.round(avgResponseTime)}ms`,
+        streak: state.streak,
+        adaptiveMultiplier: Math.round(adaptiveMultiplier * 100) / 100,
+        swiftAISpeed: updatedRacers[0] ? Math.round(updatedRacers[0].speed * 1000) / 1000 : 0,
+        mathBotSpeed: updatedRacers[1] ? Math.round(updatedRacers[1].speed * 1000) / 1000 : 0,
+      })
+    }
+  }
+
+  // Get adaptive time limit for current question (lines 14740-14763)
+  const getAdaptiveTimeLimit = (): number => {
+    if (!state.currentQuestion) return 3000
+
+    let adaptiveTime: number
+
+    if (state.difficultyTracker.learningMode) {
+      adaptiveTime = Math.max(2000, state.difficultyTracker.currentTimeLimit)
+    } else {
+      const pairKey = `${state.currentQuestion.number}_${state.currentQuestion.correctAnswer}_${state.currentQuestion.targetSum}`
+      const pairData = state.difficultyTracker.pairPerformance.get(pairKey)
+
+      if (pairData && pairData.attempts >= 2) {
+        // Use pair-specific difficulty
+        const baseTime = state.difficultyTracker.baseTimeLimit
+        const difficultyMultiplier = (6 - pairData.difficulty) / 5 // Invert: difficulty 1 = more time
+        adaptiveTime = Math.max(1000, baseTime * difficultyMultiplier)
+      } else {
+        // Default for new pairs
+        adaptiveTime = state.difficultyTracker.currentTimeLimit
+      }
+    }
+
+    // Apply user timeout setting override (lines 14765-14785)
+    return applyTimeoutSetting(adaptiveTime)
+  }
+
+  // Apply timeout setting multiplier (lines 14765-14785)
+  const applyTimeoutSetting = (baseTime: number): number => {
+    switch (state.timeoutSetting) {
+      case 'preschool':
+        return Math.max(baseTime * 4, 20000) // At least 20 seconds
+      case 'kindergarten':
+        return Math.max(baseTime * 3, 15000) // At least 15 seconds
+      case 'relaxed':
+        return Math.max(baseTime * 2.4, 12000) // At least 12 seconds
+      case 'slow':
+        return Math.max(baseTime * 1.6, 8000) // At least 8 seconds
+      case 'normal':
+        return Math.max(baseTime, 5000) // At least 5 seconds
+      case 'fast':
+        return Math.max(baseTime * 0.6, 3000) // At least 3 seconds
+      case 'expert':
+        return Math.max(baseTime * 0.4, 2000) // At least 2 seconds
+      default:
+        return baseTime
+    }
+  }
+
+  // Get adaptive feedback message (lines 11655-11721)
+  const getAdaptiveFeedbackMessage = (
+    pairKey: string,
+    _isCorrect: boolean,
+    _responseTime: number
+  ): { message: string; type: 'learning' | 'struggling' | 'mastered' | 'adapted' } | null => {
+    const pairData = state.difficultyTracker.pairPerformance.get(pairKey)
+    const [num1, num2, _sum] = pairKey.split('_').map(Number)
+
+    // Learning mode messages
+    if (state.difficultyTracker.learningMode) {
+      const encouragements = [
+        "🧠 I'm learning your style! Keep going!",
+        '📊 Building your skill profile...',
+        '🎯 Every answer helps me understand you better!',
+        '🚀 Analyzing your complement superpowers!',
+      ]
+      return {
+        message: encouragements[Math.floor(Math.random() * encouragements.length)],
+        type: 'learning',
+      }
+    }
+
+    // After learning - provide specific feedback
+    if (pairData && pairData.attempts >= 3) {
+      const accuracy = pairData.correct / pairData.attempts
+      const avgTime = pairData.avgTime
+
+      // Struggling pairs (< 60% accuracy)
+      if (accuracy < 0.6) {
+        const strugglingMessages = [
+          `💪 ${num1}+${num2} needs practice - I'm giving you extra time!`,
+          `🎯 Working on ${num1}+${num2} - you've got this!`,
+          `⏰ Taking it slower with ${num1}+${num2} - no rush!`,
+          `🧩 ${num1}+${num2} is getting special attention from me!`,
+        ]
+        return {
+          message: strugglingMessages[Math.floor(Math.random() * strugglingMessages.length)],
+          type: 'struggling',
+        }
+      }
+
+      // Mastered pairs (> 85% accuracy and fast)
+      if (accuracy > 0.85 && avgTime < 2000) {
+        const masteredMessages = [
+          `⚡ ${num1}+${num2} = MASTERED! Lightning mode activated!`,
+          `🔥 You've conquered ${num1}+${num2} - speeding it up!`,
+          `🏆 ${num1}+${num2} expert detected! Challenge mode ON!`,
+          `⭐ ${num1}+${num2} is your superpower! Going faster!`,
+        ]
+        return {
+          message: masteredMessages[Math.floor(Math.random() * masteredMessages.length)],
+          type: 'mastered',
+        }
+      }
+    }
+
+    // Show adaptation when difficulty changes
+    if (state.difficultyTracker.consecutiveCorrect >= 3) {
+      return {
+        message: "🚀 You're on fire! Increasing the challenge!",
+        type: 'adapted',
+      }
+    } else if (state.difficultyTracker.consecutiveIncorrect >= 2) {
+      return {
+        message: "🤗 Let's slow down a bit - I'm here to help!",
+        type: 'adapted',
+      }
+    }
+
+    return null
+  }
+
+  return {
+    trackPerformance,
+    getAdaptiveTimeLimit,
+    calculateRecentSuccessRate,
+    calculateAverageResponseTime,
+    getAdaptiveFeedbackMessage,
+  }
+}
--- a/apps/web/src/app/arcade/complement-race/hooks/useGameLoop.ts
+++ b/apps/web/src/app/arcade/complement-race/hooks/useGameLoop.ts
@@ -0,0 +1,69 @@
+import { useCallback, useEffect } from 'react'
+import { useComplementRace } from '../context/ComplementRaceContext'
+
+export function useGameLoop() {
+  const { state, dispatch } = useComplementRace()
+
+  // Generate first question when game begins
+  useEffect(() => {
+    if (state.gamePhase === 'playing' && !state.currentQuestion) {
+      dispatch({ type: 'NEXT_QUESTION' })
+    }
+  }, [state.gamePhase, state.currentQuestion, dispatch])
+
+  const nextQuestion = useCallback(() => {
+    if (!state.isGameActive) return
+    dispatch({ type: 'NEXT_QUESTION' })
+  }, [state.isGameActive, dispatch])
+
+  const submitAnswer = useCallback(
+    (answer: number) => {
+      if (!state.currentQuestion) return
+
+      const isCorrect = answer === state.currentQuestion.correctAnswer
+
+      if (isCorrect) {
+        // Update score, streak, progress
+        // TODO: Will implement full scoring in next step
+        dispatch({ type: 'SUBMIT_ANSWER', answer })
+
+        // Move to next question
+        dispatch({ type: 'NEXT_QUESTION' })
+      } else {
+        // Reset streak
+        // TODO: Will implement incorrect answer handling
+        dispatch({ type: 'SUBMIT_ANSWER', answer })
+      }
+    },
+    [state.currentQuestion, dispatch]
+  )
+
+  const startCountdown = useCallback(() => {
+    // Trigger countdown phase
+    dispatch({ type: 'START_COUNTDOWN' })
+
+    // Start 3-2-1-GO countdown (lines 11163-11211)
+    let count = 3
+    const countdownInterval = setInterval(() => {
+      if (count > 0) {
+        // TODO: Play countdown sound
+        count--
+      } else {
+        // GO!
+        // TODO: Play start sound
+        clearInterval(countdownInterval)
+
+        // Start the actual game after GO animation (1 second delay)
+        setTimeout(() => {
+          dispatch({ type: 'BEGIN_GAME' })
+        }, 1000)
+      }
+    }, 1000)
+  }, [dispatch])
+
+  return {
+    nextQuestion,
+    submitAnswer,
+    startCountdown,
+  }
+}
--- a/apps/web/src/app/arcade/complement-race/hooks/usePassengerAnimations.ts
+++ b/apps/web/src/app/arcade/complement-race/hooks/usePassengerAnimations.ts
@@ -0,0 +1,166 @@
+import { useEffect, useRef, useState } from 'react'
+import type { Passenger, Station } from '../lib/gameTypes'
+import type { RailroadTrackGenerator } from '../lib/RailroadTrackGenerator'
+
+export interface BoardingAnimation {
+  passenger: Passenger
+  fromX: number
+  fromY: number
+  toX: number
+  toY: number
+  carIndex: number
+  startTime: number
+}
+
+export interface DisembarkingAnimation {
+  passenger: Passenger
+  fromX: number
+  fromY: number
+  toX: number
+  toY: number
+  startTime: number
+}
+
+interface UsePassengerAnimationsParams {
+  passengers: Passenger[]
+  stations: Station[]
+  stationPositions: Array<{ x: number; y: number }>
+  trainPosition: number
+  trackGenerator: RailroadTrackGenerator
+  pathRef: React.RefObject<SVGPathElement>
+}
+
+export function usePassengerAnimations({
+  passengers,
+  stations,
+  stationPositions,
+  trainPosition,
+  trackGenerator,
+  pathRef,
+}: UsePassengerAnimationsParams) {
+  const [boardingAnimations, setBoardingAnimations] = useState<Map<string, BoardingAnimation>>(
+    new Map()
+  )
+  const [disembarkingAnimations, setDisembarkingAnimations] = useState<
+    Map<string, DisembarkingAnimation>
+  >(new Map())
+  const previousPassengersRef = useRef<Passenger[]>(passengers)
+
+  // Detect passengers boarding/disembarking and start animations
+  useEffect(() => {
+    if (!pathRef.current || stationPositions.length === 0) return
+
+    const previousPassengers = previousPassengersRef.current
+    const currentPassengers = passengers
+
+    // Find newly boarded passengers
+    const newlyBoarded = currentPassengers.filter((curr) => {
+      const prev = previousPassengers.find((p) => p.id === curr.id)
+      return curr.isBoarded && prev && !prev.isBoarded
+    })
+
+    // Find newly delivered passengers
+    const newlyDelivered = currentPassengers.filter((curr) => {
+      const prev = previousPassengers.find((p) => p.id === curr.id)
+      return curr.isDelivered && prev && !prev.isDelivered
+    })
+
+    // Start animation for each newly boarded passenger
+    newlyBoarded.forEach((passenger) => {
+      // Find origin station
+      const originStation = stations.find((s) => s.id === passenger.originStationId)
+      if (!originStation) return
+
+      const stationIndex = stations.indexOf(originStation)
+      const stationPos = stationPositions[stationIndex]
+      if (!stationPos) return
+
+      // Find which car this passenger will be in
+      const boardedPassengers = currentPassengers.filter((p) => p.isBoarded && !p.isDelivered)
+      const carIndex = boardedPassengers.indexOf(passenger)
+
+      // Calculate train car position
+      const carPosition = Math.max(0, trainPosition - (carIndex + 1) * 7) // 7% spacing
+      const carTransform = trackGenerator.getTrainTransform(pathRef.current!, carPosition)
+
+      // Create boarding animation
+      const animation: BoardingAnimation = {
+        passenger,
+        fromX: stationPos.x,
+        fromY: stationPos.y - 30,
+        toX: carTransform.x,
+        toY: carTransform.y,
+        carIndex,
+        startTime: Date.now(),
+      }
+
+      setBoardingAnimations((prev) => {
+        const next = new Map(prev)
+        next.set(passenger.id, animation)
+        return next
+      })
+
+      // Remove animation after 800ms
+      setTimeout(() => {
+        setBoardingAnimations((prev) => {
+          const next = new Map(prev)
+          next.delete(passenger.id)
+          return next
+        })
+      }, 800)
+    })
+
+    // Start animation for each newly delivered passenger
+    newlyDelivered.forEach((passenger) => {
+      // Find destination station
+      const destinationStation = stations.find((s) => s.id === passenger.destinationStationId)
+      if (!destinationStation) return
+
+      const stationIndex = stations.indexOf(destinationStation)
+      const stationPos = stationPositions[stationIndex]
+      if (!stationPos) return
+
+      // Find which car this passenger was in (before delivery)
+      const prevBoardedPassengers = previousPassengers.filter((p) => p.isBoarded && !p.isDelivered)
+      const carIndex = prevBoardedPassengers.findIndex((p) => p.id === passenger.id)
+      if (carIndex === -1) return
+
+      // Calculate train car position at time of disembarking
+      const carPosition = Math.max(0, trainPosition - (carIndex + 1) * 7) // 7% spacing
+      const carTransform = trackGenerator.getTrainTransform(pathRef.current!, carPosition)
+
+      // Create disembarking animation (from car to station)
+      const animation: DisembarkingAnimation = {
+        passenger,
+        fromX: carTransform.x,
+        fromY: carTransform.y,
+        toX: stationPos.x,
+        toY: stationPos.y - 30,
+        startTime: Date.now(),
+      }
+
+      setDisembarkingAnimations((prev) => {
+        const next = new Map(prev)
+        next.set(passenger.id, animation)
+        return next
+      })
+
+      // Remove animation after 800ms
+      setTimeout(() => {
+        setDisembarkingAnimations((prev) => {
+          const next = new Map(prev)
+          next.delete(passenger.id)
+          return next
+        })
+      }, 800)
+    })
+
+    // Update ref
+    previousPassengersRef.current = currentPassengers
+  }, [passengers, stations, stationPositions, trainPosition, trackGenerator, pathRef])
+
+  return {
+    boardingAnimations,
+    disembarkingAnimations,
+  }
+}
--- a/apps/web/src/app/arcade/complement-race/hooks/useSoundEffects.ts
+++ b/apps/web/src/app/arcade/complement-race/hooks/useSoundEffects.ts
@@ -0,0 +1,468 @@
+import { useCallback, useRef } from 'react'
+
+/**
+ * Web Audio API sound effects system
+ * Generates retro 90s-style arcade sounds programmatically
+ *
+ * Based on original implementation from web_generator.py lines 14218-14490
+ */
+
+interface Note {
+  freq: number
+  time: number
+  duration: number
+}
+
+export function useSoundEffects() {
+  const audioContextsRef = useRef<AudioContext[]>([])
+
+  /**
+   * Helper function to play multi-note 90s arcade sounds
+   */
+  const play90sSound = useCallback(
+    (
+      audioContext: AudioContext,
+      notes: Note[],
+      volume: number = 0.15,
+      waveType: OscillatorType = 'sine'
+    ) => {
+      notes.forEach((note) => {
+        const oscillator = audioContext.createOscillator()
+        const gainNode = audioContext.createGain()
+        const filterNode = audioContext.createBiquadFilter()
+
+        // Create that classic 90s arcade sound chain
+        oscillator.connect(filterNode)
+        filterNode.connect(gainNode)
+        gainNode.connect(audioContext.destination)
+
+        // Set wave type for that retro flavor
+        oscillator.type = waveType
+
+        // Add some 90s-style filtering
+        filterNode.type = 'lowpass'
+        filterNode.frequency.setValueAtTime(2000, audioContext.currentTime + note.time)
+        filterNode.Q.setValueAtTime(1, audioContext.currentTime + note.time)
+
+        // Set frequency and add vibrato for that classic arcade wobble
+        oscillator.frequency.setValueAtTime(note.freq, audioContext.currentTime + note.time)
+        if (waveType === 'sawtooth' || waveType === 'square') {
+          // Add slight vibrato for extra 90s flavor
+          oscillator.frequency.exponentialRampToValueAtTime(
+            note.freq * 1.02,
+            audioContext.currentTime + note.time + note.duration * 0.5
+          )
+          oscillator.frequency.exponentialRampToValueAtTime(
+            note.freq,
+            audioContext.currentTime + note.time + note.duration
+          )
+        }
+
+        // Classic arcade envelope - quick attack, moderate decay
+        gainNode.gain.setValueAtTime(0, audioContext.currentTime + note.time)
+        gainNode.gain.exponentialRampToValueAtTime(
+          volume,
+          audioContext.currentTime + note.time + 0.01
+        )
+        gainNode.gain.exponentialRampToValueAtTime(
+          volume * 0.7,
+          audioContext.currentTime + note.time + note.duration * 0.7
+        )
+        gainNode.gain.exponentialRampToValueAtTime(
+          0.001,
+          audioContext.currentTime + note.time + note.duration
+        )
+
+        oscillator.start(audioContext.currentTime + note.time)
+        oscillator.stop(audioContext.currentTime + note.time + note.duration)
+      })
+    },
+    []
+  )
+
+  /**
+   * Play a sound effect
+   * @param type - Sound type (correct, incorrect, countdown, etc.)
+   * @param volume - Volume level (0-1), default 0.15
+   */
+  const playSound = useCallback(
+    (
+      type:
+        | 'correct'
+        | 'incorrect'
+        | 'timeout'
+        | 'countdown'
+        | 'race_start'
+        | 'celebration'
+        | 'lap_celebration'
+        | 'gameOver'
+        | 'ai_turbo'
+        | 'milestone'
+        | 'streak'
+        | 'combo'
+        | 'whoosh'
+        | 'train_chuff'
+        | 'train_whistle'
+        | 'coal_spill'
+        | 'steam_hiss',
+      volume: number = 0.15
+    ) => {
+      try {
+        const audioContext = new (window.AudioContext || (window as any).webkitAudioContext)()
+
+        // Track audio contexts for cleanup
+        audioContextsRef.current.push(audioContext)
+
+        switch (type) {
+          case 'correct':
+            // Classic 90s "power-up" sound - ascending beeps
+            play90sSound(
+              audioContext,
+              [
+                { freq: 523, time: 0, duration: 0.08 }, // C5
+                { freq: 659, time: 0.08, duration: 0.08 }, // E5
+                { freq: 784, time: 0.16, duration: 0.12 }, // G5
+              ],
+              volume,
+              'sawtooth'
+            )
+            break
+
+          case 'incorrect':
+            // Classic arcade "error" sound - descending buzz
+            play90sSound(
+              audioContext,
+              [
+                { freq: 400, time: 0, duration: 0.15 },
+                { freq: 300, time: 0.05, duration: 0.15 },
+                { freq: 200, time: 0.1, duration: 0.2 },
+              ],
+              volume * 0.8,
+              'square'
+            )
+            break
+
+          case 'timeout':
+            // Classic "time's up" alarm
+            play90sSound(
+              audioContext,
+              [
+                { freq: 800, time: 0, duration: 0.1 },
+                { freq: 600, time: 0.1, duration: 0.1 },
+                { freq: 800, time: 0.2, duration: 0.1 },
+                { freq: 600, time: 0.3, duration: 0.15 },
+              ],
+              volume,
+              'square'
+            )
+            break
+
+          case 'countdown':
+            // Classic arcade countdown beep
+            play90sSound(
+              audioContext,
+              [{ freq: 800, time: 0, duration: 0.15 }],
+              volume * 0.6,
+              'sine'
+            )
+            break
+
+          case 'race_start':
+            // Epic race start fanfare
+            play90sSound(
+              audioContext,
+              [
+                { freq: 523, time: 0, duration: 0.1 }, // C5
+                { freq: 659, time: 0.1, duration: 0.1 }, // E5
+                { freq: 784, time: 0.2, duration: 0.1 }, // G5
+                { freq: 1046, time: 0.3, duration: 0.3 }, // C6 - triumphant!
+              ],
+              volume * 1.2,
+              'sawtooth'
+            )
+            break
+
+          case 'celebration':
+            // Classic victory fanfare - like completing a level
+            play90sSound(
+              audioContext,
+              [
+                { freq: 523, time: 0, duration: 0.12 }, // C5
+                { freq: 659, time: 0.12, duration: 0.12 }, // E5
+                { freq: 784, time: 0.24, duration: 0.12 }, // G5
+                { freq: 1046, time: 0.36, duration: 0.24 }, // C6
+                { freq: 1318, time: 0.6, duration: 0.3 }, // E6 - epic finish!
+              ],
+              volume * 1.5,
+              'sawtooth'
+            )
+            break
+
+          case 'lap_celebration':
+            // Radical "bonus achieved" sound
+            play90sSound(
+              audioContext,
+              [
+                { freq: 1046, time: 0, duration: 0.08 }, // C6
+                { freq: 1318, time: 0.08, duration: 0.08 }, // E6
+                { freq: 1568, time: 0.16, duration: 0.08 }, // G6
+                { freq: 2093, time: 0.24, duration: 0.15 }, // C7 - totally rad!
+              ],
+              volume * 1.3,
+              'sawtooth'
+            )
+            break
+
+          case 'gameOver':
+            // Classic "game over" descending tones
+            play90sSound(
+              audioContext,
+              [
+                { freq: 400, time: 0, duration: 0.2 },
+                { freq: 350, time: 0.2, duration: 0.2 },
+                { freq: 300, time: 0.4, duration: 0.2 },
+                { freq: 250, time: 0.6, duration: 0.3 },
+                { freq: 200, time: 0.9, duration: 0.4 },
+              ],
+              volume,
+              'triangle'
+            )
+            break
+
+          case 'ai_turbo':
+            // Sound when AI goes into turbo mode
+            play90sSound(
+              audioContext,
+              [
+                { freq: 200, time: 0, duration: 0.05 },
+                { freq: 400, time: 0.05, duration: 0.05 },
+                { freq: 600, time: 0.1, duration: 0.05 },
+                { freq: 800, time: 0.15, duration: 0.1 },
+              ],
+              volume * 0.7,
+              'sawtooth'
+            )
+            break
+
+          case 'milestone':
+            // Rad milestone sound - like collecting a power-up
+            play90sSound(
+              audioContext,
+              [
+                { freq: 659, time: 0, duration: 0.1 }, // E5
+                { freq: 784, time: 0.1, duration: 0.1 }, // G5
+                { freq: 880, time: 0.2, duration: 0.1 }, // A5
+                { freq: 1046, time: 0.3, duration: 0.15 }, // C6 - awesome!
+              ],
+              volume * 1.1,
+              'sawtooth'
+            )
+            break
+
+          case 'streak':
+            // Epic streak sound - getting hot!
+            play90sSound(
+              audioContext,
+              [
+                { freq: 880, time: 0, duration: 0.06 }, // A5
+                { freq: 1046, time: 0.06, duration: 0.06 }, // C6
+                { freq: 1318, time: 0.12, duration: 0.08 }, // E6
+                { freq: 1760, time: 0.2, duration: 0.1 }, // A6 - on fire!
+              ],
+              volume * 1.2,
+              'sawtooth'
+            )
+            break
+
+          case 'combo':
+            // Gnarly combo sound - for rapid correct answers
+            play90sSound(
+              audioContext,
+              [
+                { freq: 1046, time: 0, duration: 0.04 }, // C6
+                { freq: 1175, time: 0.04, duration: 0.04 }, // D6
+                { freq: 1318, time: 0.08, duration: 0.04 }, // E6
+                { freq: 1480, time: 0.12, duration: 0.06 }, // F#6
+              ],
+              volume * 0.9,
+              'square'
+            )
+            break
+
+          case 'whoosh': {
+            // Cool whoosh sound for fast responses
+            const whooshOsc = audioContext.createOscillator()
+            const whooshGain = audioContext.createGain()
+            const whooshFilter = audioContext.createBiquadFilter()
+
+            whooshOsc.connect(whooshFilter)
+            whooshFilter.connect(whooshGain)
+            whooshGain.connect(audioContext.destination)
+
+            whooshOsc.type = 'sawtooth'
+            whooshFilter.type = 'highpass'
+            whooshFilter.frequency.setValueAtTime(1000, audioContext.currentTime)
+            whooshFilter.frequency.exponentialRampToValueAtTime(100, audioContext.currentTime + 0.3)
+
+            whooshOsc.frequency.setValueAtTime(400, audioContext.currentTime)
+            whooshOsc.frequency.exponentialRampToValueAtTime(800, audioContext.currentTime + 0.15)
+            whooshOsc.frequency.exponentialRampToValueAtTime(200, audioContext.currentTime + 0.3)
+
+            whooshGain.gain.setValueAtTime(0, audioContext.currentTime)
+            whooshGain.gain.exponentialRampToValueAtTime(
+              volume * 0.6,
+              audioContext.currentTime + 0.02
+            )
+            whooshGain.gain.exponentialRampToValueAtTime(0.001, audioContext.currentTime + 0.3)
+
+            whooshOsc.start(audioContext.currentTime)
+            whooshOsc.stop(audioContext.currentTime + 0.3)
+            break
+          }
+
+          case 'train_chuff': {
+            // Realistic steam train chuffing sound
+            const chuffOsc = audioContext.createOscillator()
+            const chuffGain = audioContext.createGain()
+            const chuffFilter = audioContext.createBiquadFilter()
+
+            chuffOsc.connect(chuffFilter)
+            chuffFilter.connect(chuffGain)
+            chuffGain.connect(audioContext.destination)
+
+            chuffOsc.type = 'sawtooth'
+            chuffFilter.type = 'bandpass'
+            chuffFilter.frequency.setValueAtTime(150, audioContext.currentTime)
+            chuffFilter.Q.setValueAtTime(5, audioContext.currentTime)
+
+            chuffOsc.frequency.setValueAtTime(80, audioContext.currentTime)
+            chuffOsc.frequency.exponentialRampToValueAtTime(120, audioContext.currentTime + 0.05)
+            chuffOsc.frequency.exponentialRampToValueAtTime(60, audioContext.currentTime + 0.2)
+
+            chuffGain.gain.setValueAtTime(0, audioContext.currentTime)
+            chuffGain.gain.exponentialRampToValueAtTime(
+              volume * 0.8,
+              audioContext.currentTime + 0.01
+            )
+            chuffGain.gain.exponentialRampToValueAtTime(0.001, audioContext.currentTime + 0.2)
+
+            chuffOsc.start(audioContext.currentTime)
+            chuffOsc.stop(audioContext.currentTime + 0.2)
+            break
+          }
+
+          case 'train_whistle':
+            // Classic steam train whistle
+            play90sSound(
+              audioContext,
+              [
+                { freq: 523, time: 0, duration: 0.3 }, // C5 - long whistle
+                { freq: 659, time: 0.1, duration: 0.4 }, // E5 - harmony
+                { freq: 523, time: 0.3, duration: 0.2 }, // C5 - fade out
+              ],
+              volume * 1.2,
+              'sine'
+            )
+            break
+
+          case 'coal_spill': {
+            // Coal chunks spilling sound effect
+            const coalOsc = audioContext.createOscillator()
+            const coalGain = audioContext.createGain()
+            const coalFilter = audioContext.createBiquadFilter()
+
+            coalOsc.connect(coalFilter)
+            coalFilter.connect(coalGain)
+            coalGain.connect(audioContext.destination)
+
+            coalOsc.type = 'square'
+            coalFilter.type = 'lowpass'
+            coalFilter.frequency.setValueAtTime(300, audioContext.currentTime)
+
+            // Simulate coal chunks falling with random frequency bursts
+            coalOsc.frequency.setValueAtTime(200 + Math.random() * 100, audioContext.currentTime)
+            coalOsc.frequency.exponentialRampToValueAtTime(
+              100 + Math.random() * 50,
+              audioContext.currentTime + 0.1
+            )
+            coalOsc.frequency.exponentialRampToValueAtTime(
+              80 + Math.random() * 40,
+              audioContext.currentTime + 0.3
+            )
+
+            coalGain.gain.setValueAtTime(0, audioContext.currentTime)
+            coalGain.gain.exponentialRampToValueAtTime(
+              volume * 0.6,
+              audioContext.currentTime + 0.01
+            )
+            coalGain.gain.exponentialRampToValueAtTime(
+              volume * 0.3,
+              audioContext.currentTime + 0.15
+            )
+            coalGain.gain.exponentialRampToValueAtTime(0.001, audioContext.currentTime + 0.4)
+
+            coalOsc.start(audioContext.currentTime)
+            coalOsc.stop(audioContext.currentTime + 0.4)
+            break
+          }
+
+          case 'steam_hiss': {
+            // Steam hissing sound for locomotive
+            const steamOsc = audioContext.createOscillator()
+            const steamGain = audioContext.createGain()
+            const steamFilter = audioContext.createBiquadFilter()
+
+            steamOsc.connect(steamFilter)
+            steamFilter.connect(steamGain)
+            steamGain.connect(audioContext.destination)
+
+            steamOsc.type = 'triangle'
+            steamFilter.type = 'highpass'
+            steamFilter.frequency.setValueAtTime(2000, audioContext.currentTime)
+
+            steamOsc.frequency.setValueAtTime(4000 + Math.random() * 1000, audioContext.currentTime)
+
+            steamGain.gain.setValueAtTime(0, audioContext.currentTime)
+            steamGain.gain.exponentialRampToValueAtTime(
+              volume * 0.4,
+              audioContext.currentTime + 0.02
+            )
+            steamGain.gain.exponentialRampToValueAtTime(0.001, audioContext.currentTime + 0.6)
+
+            steamOsc.start(audioContext.currentTime)
+            steamOsc.stop(audioContext.currentTime + 0.6)
+            break
+          }
+        }
+      } catch (_e) {
+        console.log('🎵 Web Audio not supported - missing out on rad 90s sounds!')
+      }
+    },
+    [play90sSound]
+  )
+
+  /**
+   * Stop all currently playing sounds
+   */
+  const stopAllSounds = useCallback(() => {
+    try {
+      if (audioContextsRef.current.length > 0) {
+        audioContextsRef.current.forEach((context) => {
+          try {
+            context.close()
+          } catch (_e) {
+            // Ignore errors
+          }
+        })
+        audioContextsRef.current = []
+      }
+    } catch (e) {
+      console.log('🔇 Sound cleanup error:', e)
+    }
+  }, [])
+
+  return {
+    playSound,
+    stopAllSounds,
+  }
+}
--- a/apps/web/src/app/arcade/complement-race/hooks/useSteamJourney.ts
+++ b/apps/web/src/app/arcade/complement-race/hooks/useSteamJourney.ts
@@ -0,0 +1,457 @@
+import { useEffect, useRef } from 'react'
+import { useComplementRace } from '../context/ComplementRaceContext'
+import { calculateMaxConcurrentPassengers, generatePassengers } from '../lib/passengerGenerator'
+import { useSoundEffects } from './useSoundEffects'
+
+/**
+ * Steam Sprint momentum system (Infinite Mode)
+ *
+ * Momentum mechanics:
+ * - Each correct answer adds momentum (builds up steam pressure)
+ * - Momentum decays over time based on skill level
+ * - Train automatically advances to next route upon completion
+ * - Game continues indefinitely until player quits
+ * - Time-of-day cycle repeats every 60 seconds
+ *
+ * Skill level decay rates (momentum lost per second):
+ * - Preschool: 2.0/s (very slow decay)
+ * - Kindergarten: 3.5/s
+ * - Relaxed: 5.0/s
+ * - Slow: 7.0/s
+ * - Normal: 9.0/s
+ * - Fast: 11.0/s
+ * - Expert: 13.0/s (rapid decay)
+ */
+
+const MOMENTUM_DECAY_RATES = {
+  preschool: 2.0,
+  kindergarten: 3.5,
+  relaxed: 5.0,
+  slow: 7.0,
+  normal: 9.0,
+  fast: 11.0,
+  expert: 13.0,
+}
+
+const MOMENTUM_GAIN_PER_CORRECT = 15 // Momentum added for each correct answer
+const SPEED_MULTIPLIER = 0.15 // Convert momentum to speed (% per second at momentum=100)
+const UPDATE_INTERVAL = 50 // Update every 50ms (~20 fps)
+const GAME_DURATION = 60000 // 60 seconds in milliseconds
+
+export function useSteamJourney() {
+  const { state, dispatch } = useComplementRace()
+  const { playSound } = useSoundEffects()
+  const gameStartTimeRef = useRef<number>(0)
+  const lastUpdateRef = useRef<number>(0)
+  const routeExitThresholdRef = useRef<number>(107) // Default for 1 car: 100 + 7
+
+  // Initialize game start time and generate initial passengers
+  useEffect(() => {
+    if (state.isGameActive && state.style === 'sprint' && gameStartTimeRef.current === 0) {
+      gameStartTimeRef.current = Date.now()
+      lastUpdateRef.current = Date.now()
+
+      // Generate initial passengers if none exist
+      if (state.passengers.length === 0) {
+        const newPassengers = generatePassengers(state.stations)
+        dispatch({ type: 'GENERATE_PASSENGERS', passengers: newPassengers })
+
+        // Calculate and store exit threshold for this route
+        const CAR_SPACING = 7
+        const maxPassengers = calculateMaxConcurrentPassengers(newPassengers, state.stations)
+        const maxCars = Math.max(1, maxPassengers)
+        routeExitThresholdRef.current = 100 + maxCars * CAR_SPACING
+      }
+    }
+  }, [state.isGameActive, state.style, state.stations, state.passengers.length, dispatch])
+
+  // Momentum decay and position update loop
+  useEffect(() => {
+    if (!state.isGameActive || state.style !== 'sprint') return
+
+    const interval = setInterval(() => {
+      const now = Date.now()
+      const elapsed = now - gameStartTimeRef.current
+      const deltaTime = now - lastUpdateRef.current
+      lastUpdateRef.current = now
+
+      // Steam Sprint is infinite - no time limit
+
+      // Get decay rate based on timeout setting (skill level)
+      const decayRate = MOMENTUM_DECAY_RATES[state.timeoutSetting] || MOMENTUM_DECAY_RATES.normal
+
+      // Calculate momentum decay for this frame
+      const momentumLoss = (decayRate * deltaTime) / 1000
+
+      // Update momentum (don't go below 0)
+      const newMomentum = Math.max(0, state.momentum - momentumLoss)
+
+      // Calculate speed from momentum (% per second)
+      const speed = newMomentum * SPEED_MULTIPLIER
+
+      // Update train position (accumulate, never go backward)
+      // Allow position to go past 100% so entire train (including cars) can exit tunnel
+      const positionDelta = (speed * deltaTime) / 1000
+      const trainPosition = state.trainPosition + positionDelta
+
+      // Calculate pressure (0-150 PSI) - based on momentum as percentage of max
+      const maxMomentum = 100 // Theoretical max momentum
+      const pressure = Math.min(150, (newMomentum / maxMomentum) * 150)
+
+      // Update state
+      dispatch({
+        type: 'UPDATE_STEAM_JOURNEY',
+        momentum: newMomentum,
+        trainPosition,
+        pressure,
+        elapsedTime: elapsed,
+      })
+
+      // Check for passengers that should board
+      // Passengers board when an EMPTY car reaches their station
+      const CAR_SPACING = 7 // Must match SteamTrainJourney component
+      const maxPassengers = calculateMaxConcurrentPassengers(state.passengers, state.stations)
+      const maxCars = Math.max(1, maxPassengers)
+      const currentBoardedPassengers = state.passengers.filter((p) => p.isBoarded && !p.isDelivered)
+
+      // Debug logging flag - enable when debugging passenger boarding issues
+      // TO ENABLE: Change this to true, save, and the logs will appear in the browser console
+      // When you see passengers getting left behind, copy the entire console log and paste into Claude Code
+      const DEBUG_PASSENGER_BOARDING = true
+
+      if (DEBUG_PASSENGER_BOARDING) {
+        console.log('\n'.repeat(3))
+        console.log('='.repeat(80))
+        console.log('🚂 PASSENGER BOARDING DEBUG LOG')
+        console.log('='.repeat(80))
+        console.log('ISSUE: Passengers are getting left behind at stations')
+        console.log('PURPOSE: This log captures all state during boarding/delivery logic')
+        console.log('USAGE: Copy this entire log and paste into Claude Code for debugging')
+        console.log('='.repeat(80))
+        console.log('\n📊 CURRENT FRAME STATE:')
+        console.log(`  Train Position: ${trainPosition.toFixed(2)}`)
+        console.log(`  Speed: ${speed.toFixed(2)}% per second`)
+        console.log(`  Momentum: ${newMomentum.toFixed(2)}`)
+        console.log(`  Max Cars: ${maxCars}`)
+        console.log(`  Car Spacing: ${CAR_SPACING}`)
+        console.log(`  Distance Tolerance: 5`)
+
+        console.log('\n🚉 STATIONS:')
+        state.stations.forEach((station) => {
+          console.log(`  ${station.emoji} ${station.name} (ID: ${station.id})`)
+          console.log(`    Position: ${station.position}`)
+        })
+
+        console.log('\n👥 ALL PASSENGERS:')
+        state.passengers.forEach((p, idx) => {
+          const origin = state.stations.find((s) => s.id === p.originStationId)
+          const dest = state.stations.find((s) => s.id === p.destinationStationId)
+          console.log(`  [${idx}] ${p.name} (ID: ${p.id})`)
+          console.log(
+            `    Status: ${p.isDelivered ? 'DELIVERED' : p.isBoarded ? 'BOARDED' : 'WAITING'}`
+          )
+          console.log(
+            `    Route: ${origin?.emoji} ${origin?.name} (pos ${origin?.position}) → ${dest?.emoji} ${dest?.name} (pos ${dest?.position})`
+          )
+          console.log(`    Urgent: ${p.isUrgent}`)
+        })
+
+        console.log('\n🚃 CAR POSITIONS:')
+        for (let i = 0; i < maxCars; i++) {
+          const carPos = Math.max(0, trainPosition - (i + 1) * CAR_SPACING)
+          console.log(`  Car ${i}: position ${carPos.toFixed(2)}`)
+        }
+
+        console.log('\n🔍 CURRENTLY BOARDED PASSENGERS:')
+        currentBoardedPassengers.forEach((p, carIndex) => {
+          const carPos = Math.max(0, trainPosition - (carIndex + 1) * CAR_SPACING)
+          const dest = state.stations.find((s) => s.id === p.destinationStationId)
+          const distToDest = Math.abs(carPos - (dest?.position || 0))
+          console.log(`  Car ${carIndex}: ${p.name}`)
+          console.log(`    Car position: ${carPos.toFixed(2)}`)
+          console.log(`    Destination: ${dest?.emoji} ${dest?.name} (pos ${dest?.position})`)
+          console.log(`    Distance to dest: ${distToDest.toFixed(2)}`)
+          console.log(`    Will deliver: ${distToDest < 5 ? 'YES' : 'NO'}`)
+        })
+      }
+
+      // FIRST: Identify which passengers will be delivered in this frame
+      const passengersToDeliver = new Set<string>()
+      currentBoardedPassengers.forEach((passenger, carIndex) => {
+        if (!passenger || passenger.isDelivered) return
+
+        const station = state.stations.find((s) => s.id === passenger.destinationStationId)
+        if (!station) return
+
+        // Calculate this passenger's car position
+        const carPosition = Math.max(0, trainPosition - (carIndex + 1) * CAR_SPACING)
+        const distance = Math.abs(carPosition - station.position)
+
+        // If this car is at the destination station (within 5% tolerance), mark for delivery
+        if (distance < 5) {
+          passengersToDeliver.add(passenger.id)
+        }
+      })
+
+      // Build a map of which cars are occupied (excluding passengers being delivered this frame)
+      const occupiedCars = new Map<number, (typeof currentBoardedPassengers)[0]>()
+      currentBoardedPassengers.forEach((passenger, arrayIndex) => {
+        // Don't count a car as occupied if its passenger is being delivered this frame
+        if (!passengersToDeliver.has(passenger.id)) {
+          occupiedCars.set(arrayIndex, passenger)
+        }
+      })
+
+      if (DEBUG_PASSENGER_BOARDING) {
+        console.log('\n📦 PASSENGERS TO DELIVER THIS FRAME:')
+        if (passengersToDeliver.size === 0) {
+          console.log('  None')
+        } else {
+          passengersToDeliver.forEach((id) => {
+            const p = state.passengers.find((passenger) => passenger.id === id)
+            console.log(`  - ${p?.name} (ID: ${id})`)
+          })
+        }
+
+        console.log('\n🚗 OCCUPIED CARS (after excluding deliveries):')
+        if (occupiedCars.size === 0) {
+          console.log('  All cars are empty')
+        } else {
+          occupiedCars.forEach((passenger, carIndex) => {
+            console.log(`  Car ${carIndex}: ${passenger.name}`)
+          })
+        }
+
+        console.log('\n🔄 BOARDING ATTEMPTS:')
+      }
+
+      // Track which cars are assigned in THIS frame to prevent double-boarding
+      const carsAssignedThisFrame = new Set<number>()
+
+      // Find waiting passengers whose origin station has an empty car nearby
+      state.passengers.forEach((passenger) => {
+        if (passenger.isBoarded || passenger.isDelivered) return
+
+        const station = state.stations.find((s) => s.id === passenger.originStationId)
+        if (!station) return
+
+        if (DEBUG_PASSENGER_BOARDING) {
+          console.log(
+            `\n  Passenger: ${passenger.name} waiting at ${station.emoji} ${station.name} (pos ${station.position})`
+          )
+        }
+
+        // Check if any empty car is at this station
+        // Cars are at positions: trainPosition - 7, trainPosition - 14, etc.
+        let boarded = false
+        for (let carIndex = 0; carIndex < maxCars; carIndex++) {
+          const carPosition = Math.max(0, trainPosition - (carIndex + 1) * CAR_SPACING)
+          const distance = Math.abs(carPosition - station.position)
+
+          if (DEBUG_PASSENGER_BOARDING) {
+            const isOccupied = occupiedCars.has(carIndex)
+            const isAssigned = carsAssignedThisFrame.has(carIndex)
+            const inRange = distance < 5
+            const occupant = occupiedCars.get(carIndex)
+
+            console.log(`    Car ${carIndex} @ pos ${carPosition.toFixed(2)}:`)
+            console.log(`      Distance to station: ${distance.toFixed(2)}`)
+            console.log(`      In range (<5): ${inRange}`)
+            console.log(
+              `      Occupied: ${isOccupied}${isOccupied ? ` (by ${occupant?.name})` : ''}`
+            )
+            console.log(`      Assigned this frame: ${isAssigned}`)
+            console.log(`      Can board: ${!isOccupied && !isAssigned && inRange}`)
+          }
+
+          // Skip if this car already has a passenger OR was assigned this frame
+          if (occupiedCars.has(carIndex) || carsAssignedThisFrame.has(carIndex)) continue
+
+          const distance2 = Math.abs(carPosition - station.position)
+
+          // If car is at or near station (within 5% tolerance for fast trains), board this passenger
+          // Increased tolerance to ensure fast-moving trains don't miss passengers
+          if (distance2 < 5) {
+            if (DEBUG_PASSENGER_BOARDING) {
+              console.log(`    ✅ BOARDING ${passenger.name} onto Car ${carIndex}`)
+            }
+            dispatch({
+              type: 'BOARD_PASSENGER',
+              passengerId: passenger.id,
+            })
+            // Mark this car as assigned in this frame
+            carsAssignedThisFrame.add(carIndex)
+            boarded = true
+            return // Board this passenger and move on
+          }
+        }
+
+        if (DEBUG_PASSENGER_BOARDING && !boarded) {
+          console.log(`    ❌ ${passenger.name} NOT BOARDED - no suitable car found`)
+        }
+      })
+
+      if (DEBUG_PASSENGER_BOARDING) {
+        console.log('\n🎯 DELIVERY ATTEMPTS:')
+      }
+
+      // Check for deliverable passengers
+      // Passengers disembark when THEIR car reaches their destination
+      currentBoardedPassengers.forEach((passenger, carIndex) => {
+        if (!passenger || passenger.isDelivered) return
+
+        const station = state.stations.find((s) => s.id === passenger.destinationStationId)
+        if (!station) return
+
+        // Calculate this passenger's car position
+        const carPosition = Math.max(0, trainPosition - (carIndex + 1) * CAR_SPACING)
+        const distance = Math.abs(carPosition - station.position)
+
+        // If this car is at the destination station (within 5% tolerance), deliver
+        if (distance < 5) {
+          if (DEBUG_PASSENGER_BOARDING) {
+            console.log(
+              `  ✅ DELIVERING ${passenger.name} from Car ${carIndex} to ${station.emoji} ${station.name}`
+            )
+            console.log(
+              `    Car position: ${carPosition.toFixed(2)}, Station: ${station.position}, Distance: ${distance.toFixed(2)}`
+            )
+          }
+          const points = passenger.isUrgent ? 20 : 10
+          dispatch({
+            type: 'DELIVER_PASSENGER',
+            passengerId: passenger.id,
+            points,
+          })
+        } else if (DEBUG_PASSENGER_BOARDING) {
+          console.log(
+            `  ⏳ ${passenger.name} in Car ${carIndex} heading to ${station.emoji} ${station.name}`
+          )
+          console.log(
+            `    Car position: ${carPosition.toFixed(2)}, Station: ${station.position}, Distance: ${distance.toFixed(2)}`
+          )
+        }
+      })
+
+      if (DEBUG_PASSENGER_BOARDING) {
+        console.log(`\n${'='.repeat(80)}`)
+        console.log('END OF DEBUG LOG')
+        console.log('='.repeat(80))
+      }
+
+      // Check for route completion (entire train exits tunnel)
+      // Use stored threshold (stable for entire route)
+      const ENTIRE_TRAIN_EXIT_THRESHOLD = routeExitThresholdRef.current
+
+      if (
+        trainPosition >= ENTIRE_TRAIN_EXIT_THRESHOLD &&
+        state.trainPosition < ENTIRE_TRAIN_EXIT_THRESHOLD
+      ) {
+        // Play celebration whistle
+        playSound('train_whistle', 0.6)
+        setTimeout(() => {
+          playSound('celebration', 0.4)
+        }, 800)
+
+        // Auto-advance to next route
+        const nextRoute = state.currentRoute + 1
+        dispatch({
+          type: 'START_NEW_ROUTE',
+          routeNumber: nextRoute,
+          stations: state.stations,
+        })
+
+        // Generate new passengers
+        const newPassengers = generatePassengers(state.stations)
+        dispatch({ type: 'GENERATE_PASSENGERS', passengers: newPassengers })
+
+        // Calculate and store new exit threshold for next route
+        const newMaxPassengers = calculateMaxConcurrentPassengers(newPassengers, state.stations)
+        const newMaxCars = Math.max(1, newMaxPassengers)
+        routeExitThresholdRef.current = 100 + newMaxCars * CAR_SPACING
+      }
+    }, UPDATE_INTERVAL)
+
+    return () => clearInterval(interval)
+  }, [
+    state.isGameActive,
+    state.style,
+    state.momentum,
+    state.trainPosition,
+    state.timeoutSetting,
+    state.passengers,
+    state.stations,
+    state.currentRoute,
+    dispatch,
+    playSound,
+  ])
+
+  // Auto-regenerate passengers when all are delivered
+  useEffect(() => {
+    if (!state.isGameActive || state.style !== 'sprint') return
+
+    // Check if all passengers are delivered
+    const allDelivered = state.passengers.length > 0 && state.passengers.every((p) => p.isDelivered)
+
+    if (allDelivered) {
+      // Generate new passengers after a short delay
+      setTimeout(() => {
+        const newPassengers = generatePassengers(state.stations)
+        dispatch({ type: 'GENERATE_PASSENGERS', passengers: newPassengers })
+      }, 1000)
+    }
+  }, [state.isGameActive, state.style, state.passengers, state.stations, dispatch])
+
+  // Add momentum on correct answer
+  useEffect(() => {
+    // Only for sprint mode
+    if (state.style !== 'sprint') return
+
+    // This effect triggers when correctAnswers increases
+    // We use a ref to track previous value to detect changes
+  }, [state.style])
+
+  // Function to boost momentum (called when answer is correct)
+  const boostMomentum = () => {
+    if (state.style !== 'sprint') return
+
+    const newMomentum = Math.min(100, state.momentum + MOMENTUM_GAIN_PER_CORRECT)
+    dispatch({
+      type: 'UPDATE_STEAM_JOURNEY',
+      momentum: newMomentum,
+      trainPosition: state.trainPosition, // Keep current position
+      pressure: state.pressure,
+      elapsedTime: state.elapsedTime,
+    })
+  }
+
+  // Calculate time of day period (0-5 for 6 periods, cycles infinitely)
+  const getTimeOfDayPeriod = (): number => {
+    if (state.elapsedTime === 0) return 0
+    const periodDuration = GAME_DURATION / 6
+    return Math.floor(state.elapsedTime / periodDuration) % 6
+  }
+
+  // Get sky gradient colors based on time of day
+  const getSkyGradient = (): { top: string; bottom: string } => {
+    const period = getTimeOfDayPeriod()
+
+    // 6 periods over 60 seconds: dawn → morning → midday → afternoon → dusk → night
+    const gradients = [
+      { top: '#1e3a8a', bottom: '#f59e0b' }, // Dawn - deep blue to orange
+      { top: '#3b82f6', bottom: '#fbbf24' }, // Morning - blue to yellow
+      { top: '#60a5fa', bottom: '#93c5fd' }, // Midday - bright blue
+      { top: '#3b82f6', bottom: '#f59e0b' }, // Afternoon - blue to orange
+      { top: '#7c3aed', bottom: '#f97316' }, // Dusk - purple to orange
+      { top: '#1e1b4b', bottom: '#312e81' }, // Night - dark purple
+    ]
+
+    return gradients[period] || gradients[0]
+  }
+
+  return {
+    boostMomentum,
+    getTimeOfDayPeriod,
+    getSkyGradient,
+  }
+}
--- a/apps/web/src/app/arcade/complement-race/hooks/useTrackManagement.ts
+++ b/apps/web/src/app/arcade/complement-race/hooks/useTrackManagement.ts
@@ -0,0 +1,142 @@
+import { useEffect, useRef, useState } from 'react'
+import type { Passenger, Station } from '../lib/gameTypes'
+import { generateLandmarks, type Landmark } from '../lib/landmarks'
+import type { RailroadTrackGenerator } from '../lib/RailroadTrackGenerator'
+
+interface UseTrackManagementParams {
+  currentRoute: number
+  trainPosition: number
+  trackGenerator: RailroadTrackGenerator
+  pathRef: React.RefObject<SVGPathElement>
+  stations: Station[]
+  passengers: Passenger[]
+  maxCars: number
+  carSpacing: number
+}
+
+export function useTrackManagement({
+  currentRoute,
+  trainPosition,
+  trackGenerator,
+  pathRef,
+  stations,
+  passengers,
+  maxCars: _maxCars,
+  carSpacing: _carSpacing,
+}: UseTrackManagementParams) {
+  const [trackData, setTrackData] = useState<ReturnType<
+    typeof trackGenerator.generateTrack
+  > | null>(null)
+  const [tiesAndRails, setTiesAndRails] = useState<{
+    ties: Array<{ x1: number; y1: number; x2: number; y2: number }>
+    leftRailPath: string
+    rightRailPath: string
+  } | null>(null)
+  const [stationPositions, setStationPositions] = useState<Array<{ x: number; y: number }>>([])
+  const [landmarks, setLandmarks] = useState<Landmark[]>([])
+  const [landmarkPositions, setLandmarkPositions] = useState<Array<{ x: number; y: number }>>([])
+  const [displayPassengers, setDisplayPassengers] = useState<Passenger[]>(passengers)
+
+  // Track previous route data to maintain visuals during transition
+  const previousRouteRef = useRef(currentRoute)
+  const [pendingTrackData, setPendingTrackData] = useState<ReturnType<
+    typeof trackGenerator.generateTrack
+  > | null>(null)
+  const displayRouteRef = useRef(currentRoute) // Track which route's passengers are being displayed
+
+  // Generate landmarks when route changes
+  useEffect(() => {
+    const newLandmarks = generateLandmarks(currentRoute)
+    setLandmarks(newLandmarks)
+  }, [currentRoute])
+
+  // Generate track on mount and when route changes
+  useEffect(() => {
+    const track = trackGenerator.generateTrack(currentRoute)
+
+    // If we're in the middle of a route (position > 0), store as pending
+    // Only apply new track when position resets to beginning (< 0)
+    if (trainPosition > 0 && previousRouteRef.current !== currentRoute) {
+      setPendingTrackData(track)
+    } else {
+      setTrackData(track)
+      previousRouteRef.current = currentRoute
+      setPendingTrackData(null)
+    }
+  }, [trackGenerator, currentRoute, trainPosition])
+
+  // Apply pending track when train resets to beginning
+  useEffect(() => {
+    if (pendingTrackData && trainPosition < 0) {
+      setTrackData(pendingTrackData)
+      previousRouteRef.current = currentRoute
+      setPendingTrackData(null)
+    }
+  }, [pendingTrackData, trainPosition, currentRoute])
+
+  // Manage passenger display during route transitions
+  useEffect(() => {
+    // Only switch to new passengers when:
+    // 1. Train has reset to start position (< 0) - track has changed, OR
+    // 2. Same route AND train is in middle of track (10-90%) - gameplay updates like boarding/delivering
+    const trainReset = trainPosition < 0
+    const sameRoute = currentRoute === displayRouteRef.current
+    const inMiddleOfTrack = trainPosition >= 10 && trainPosition < 90 // Avoid start/end transition zones
+
+    if (trainReset) {
+      // Train reset - update to new route's passengers
+      setDisplayPassengers(passengers)
+      displayRouteRef.current = currentRoute
+    } else if (sameRoute && inMiddleOfTrack) {
+      // Same route and train in middle of track - update passengers for gameplay changes (boarding/delivery)
+      setDisplayPassengers(passengers)
+    }
+    // Otherwise, keep displaying old passengers until train resets
+  }, [passengers, trainPosition, currentRoute])
+
+  // Generate ties and rails when path is ready
+  useEffect(() => {
+    if (pathRef.current && trackData) {
+      const result = trackGenerator.generateTiesAndRails(pathRef.current)
+      setTiesAndRails(result)
+    }
+  }, [trackData, trackGenerator, pathRef])
+
+  // Calculate station positions when path is ready
+  useEffect(() => {
+    if (pathRef.current) {
+      const positions = stations.map((station) => {
+        const pathLength = pathRef.current!.getTotalLength()
+        const distance = (station.position / 100) * pathLength
+        const point = pathRef.current!.getPointAtLength(distance)
+        return { x: point.x, y: point.y }
+      })
+      setStationPositions(positions)
+    }
+  }, [stations, pathRef])
+
+  // Calculate landmark positions when path is ready
+  useEffect(() => {
+    if (pathRef.current && landmarks.length > 0) {
+      const positions = landmarks.map((landmark) => {
+        const pathLength = pathRef.current!.getTotalLength()
+        const distance = (landmark.position / 100) * pathLength
+        const point = pathRef.current!.getPointAtLength(distance)
+        return {
+          x: point.x + landmark.offset.x,
+          y: point.y + landmark.offset.y,
+        }
+      })
+      setLandmarkPositions(positions)
+    }
+  }, [landmarks, pathRef])
+
+  return {
+    trackData,
+    tiesAndRails,
+    stationPositions,
+    landmarks,
+    landmarkPositions,
+    displayPassengers,
+  }
+}
--- a/apps/web/src/app/arcade/complement-race/hooks/useTrainTransforms.ts
+++ b/apps/web/src/app/arcade/complement-race/hooks/useTrainTransforms.ts
@@ -0,0 +1,117 @@
+import { useEffect, useMemo, useState } from 'react'
+import type { RailroadTrackGenerator } from '../lib/RailroadTrackGenerator'
+
+interface TrainTransform {
+  x: number
+  y: number
+  rotation: number
+}
+
+interface TrainCarTransform extends TrainTransform {
+  position: number
+  opacity: number
+}
+
+interface UseTrainTransformsParams {
+  trainPosition: number
+  trackGenerator: RailroadTrackGenerator
+  pathRef: React.RefObject<SVGPathElement>
+  maxCars: number
+  carSpacing: number
+}
+
+export function useTrainTransforms({
+  trainPosition,
+  trackGenerator,
+  pathRef,
+  maxCars,
+  carSpacing,
+}: UseTrainTransformsParams) {
+  const [trainTransform, setTrainTransform] = useState<TrainTransform>({
+    x: 50,
+    y: 300,
+    rotation: 0,
+  })
+
+  // Update train position and rotation
+  useEffect(() => {
+    if (pathRef.current) {
+      const transform = trackGenerator.getTrainTransform(pathRef.current, trainPosition)
+      setTrainTransform(transform)
+    }
+  }, [trainPosition, trackGenerator, pathRef])
+
+  // Calculate train car transforms (each car follows behind the locomotive)
+  const trainCars = useMemo((): TrainCarTransform[] => {
+    if (!pathRef.current) {
+      return Array.from({ length: maxCars }, () => ({
+        x: 0,
+        y: 0,
+        rotation: 0,
+        position: 0,
+        opacity: 0,
+      }))
+    }
+
+    return Array.from({ length: maxCars }).map((_, carIndex) => {
+      // Calculate position for this car (behind the locomotive)
+      const carPosition = Math.max(0, trainPosition - (carIndex + 1) * carSpacing)
+
+      // Calculate opacity: fade in at left tunnel (3-8%), fade out at right tunnel (92-97%)
+      const fadeInStart = 3
+      const fadeInEnd = 8
+      const fadeOutStart = 92
+      const fadeOutEnd = 97
+
+      let opacity = 1 // Default to fully visible
+
+      // Fade in from left tunnel
+      if (carPosition <= fadeInStart) {
+        opacity = 0
+      } else if (carPosition < fadeInEnd) {
+        opacity = (carPosition - fadeInStart) / (fadeInEnd - fadeInStart)
+      }
+      // Fade out into right tunnel
+      else if (carPosition >= fadeOutEnd) {
+        opacity = 0
+      } else if (carPosition > fadeOutStart) {
+        opacity = 1 - (carPosition - fadeOutStart) / (fadeOutEnd - fadeOutStart)
+      }
+
+      return {
+        ...trackGenerator.getTrainTransform(pathRef.current!, carPosition),
+        position: carPosition,
+        opacity,
+      }
+    })
+  }, [trainPosition, trackGenerator, pathRef, maxCars, carSpacing])
+
+  // Calculate locomotive opacity (fade in/out through tunnels)
+  const locomotiveOpacity = useMemo(() => {
+    const fadeInStart = 3
+    const fadeInEnd = 8
+    const fadeOutStart = 92
+    const fadeOutEnd = 97
+
+    // Fade in from left tunnel
+    if (trainPosition <= fadeInStart) {
+      return 0
+    } else if (trainPosition < fadeInEnd) {
+      return (trainPosition - fadeInStart) / (fadeInEnd - fadeInStart)
+    }
+    // Fade out into right tunnel
+    else if (trainPosition >= fadeOutEnd) {
+      return 0
+    } else if (trainPosition > fadeOutStart) {
+      return 1 - (trainPosition - fadeOutStart) / (fadeOutEnd - fadeOutStart)
+    }
+
+    return 1 // Default to fully visible
+  }, [trainPosition])
+
+  return {
+    trainTransform,
+    trainCars,
+    locomotiveOpacity,
+  }
+}
--- a/Show More
+++ b/Show More