chore(release): 2.16.7 [skip ci]

## [2.16.7](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.16.6...v2.16.7) (2025-10-10) ### Bug Fixes * compile TypeScript server files to JavaScript for production ([83b9a4d](83b9a4d976)) * remove standalone output mode incompatible with custom server ([c8da5a8](c8da5a8340)) * update Dockerfile for non-standalone production builds ([14746c5](14746c568e))
fix: update Dockerfile for non-standalone production builds
2025-10-10 12:56:18 +00:00 · 2025-10-10 07:55:18 -05:00 · 2025-10-10 07:55:18 -05:00 · 2025-10-10 07:55:18 -05:00 · 2025-10-10 00:09:14 +00:00 · 2025-10-09 19:08:22 -05:00
75 changed files with 7894 additions and 574 deletions
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,254 @@
+## [2.16.7](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.16.6...v2.16.7) (2025-10-10)
+
+
+### Bug Fixes
+
+* compile TypeScript server files to JavaScript for production ([83b9a4d](https://github.com/antialias/soroban-abacus-flashcards/commit/83b9a4d976fa540782826afa13a35c92e706bf1e))
+* remove standalone output mode incompatible with custom server ([c8da5a8](https://github.com/antialias/soroban-abacus-flashcards/commit/c8da5a8340c8798bba452b43244bc0e04ce8b0c5))
+* update Dockerfile for non-standalone production builds ([14746c5](https://github.com/antialias/soroban-abacus-flashcards/commit/14746c568e58f4a847e0da2d866dbaeabf5a0e8b))
+
+## [2.16.6](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.16.5...v2.16.6) (2025-10-10)
+
+
+### Bug Fixes
+
+* correct static files and public path in Docker image ([c287b19](https://github.com/antialias/soroban-abacus-flashcards/commit/c287b19a39e1506033db6de39aa4d3761cb65d62))
+
+## [2.16.5](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.16.4...v2.16.5) (2025-10-09)
+
+
+### Bug Fixes
+
+* correct node_modules path for pnpm symlinks in Docker ([c12351f](https://github.com/antialias/soroban-abacus-flashcards/commit/c12351f2c99daaed710a1136eb13f6ccc54cbcff))
+
+## [2.16.4](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.16.3...v2.16.4) (2025-10-09)
+
+
+### Bug Fixes
+
+* correct Docker CMD to use root-level server.js ([48b47e9](https://github.com/antialias/soroban-abacus-flashcards/commit/48b47e9bdb0da44746282cd7cf7599a69bf5130d))
+
+## [2.16.3](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.16.2...v2.16.3) (2025-10-09)
+
+
+### Bug Fixes
+
+* use game state playerMetadata instead of GameModeContext in UI components ([388c254](https://github.com/antialias/soroban-abacus-flashcards/commit/388c25451d11b85236c1f7682fe2f7a62a15d5eb))
+
+## [2.16.2](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.16.1...v2.16.2) (2025-10-09)
+
+
+### Bug Fixes
+
+* use only local user's players in LocalMemoryPairsProvider ([c26138f](https://github.com/antialias/soroban-abacus-flashcards/commit/c26138ffb55a237a99cb6ff399c8a2ac54a22b51))
+
+## [2.16.1](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.16.0...v2.16.1) (2025-10-09)
+
+
+### Bug Fixes
+
+* convert LocalMemoryPairsProvider to pure client-side with useReducer ([b128db1](https://github.com/antialias/soroban-abacus-flashcards/commit/b128db1783a8dcffe7879745c3342add2f9ffe29))
+
+## [2.16.0](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.15.0...v2.16.0) (2025-10-09)
+
+
+### Features
+
+* fade out hover avatar when player stops hovering ([820eeb4](https://github.com/antialias/soroban-abacus-flashcards/commit/820eeb4fb03ad8be6a86dd0a26e089052224f427))
+
+## [2.15.0](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.14.3...v2.15.0) (2025-10-09)
+
+
+### Features
+
+* implement smooth hover avatar animations with react-spring ([442c6b4](https://github.com/antialias/soroban-abacus-flashcards/commit/442c6b4529ba5c820b1fe8a64805a3d85489a8ea))
+
+## [2.14.3](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.14.2...v2.14.3) (2025-10-09)
+
+
+### Bug Fixes
+
+* enable smooth spring animations between card hovers ([8d53b58](https://github.com/antialias/soroban-abacus-flashcards/commit/8d53b589aa17ebc6d0a9251b3006fd8a90f90a61))
+
+## [2.14.2](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.14.1...v2.14.2) (2025-10-09)
+
+
+### Bug Fixes
+
+* correct avatar positioning to prevent fly-in animation ([573d0df](https://github.com/antialias/soroban-abacus-flashcards/commit/573d0df20dcdac41021c46feb423dbf3782728f6))
+
+## [2.14.1](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.14.0...v2.14.1) (2025-10-09)
+
+
+### Bug Fixes
+
+* prevent avatar fly-in and hide local player's own hover ([7f65a67](https://github.com/antialias/soroban-abacus-flashcards/commit/7f65a67cef3d7f0ebce1bd7417972a6138acfc46))
+
+## [2.14.0](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.13.0...v2.14.0) (2025-10-09)
+
+
+### Features
+
+* improve hover avatars with smooth animation and 3D elevation ([71b11f4](https://github.com/antialias/soroban-abacus-flashcards/commit/71b11f4ef08a5f9c3f1c1aaabca21ef023d5c0ce))
+
+## [2.13.0](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.12.3...v2.13.0) (2025-10-09)
+
+
+### Features
+
+* implement networked hover presence for multiplayer gameplay ([62f3730](https://github.com/antialias/soroban-abacus-flashcards/commit/62f3730542334a0580f5dad1c73adc333614ee58))
+
+
+### Code Refactoring
+
+* move canModifyPlayers logic into provider layer ([db9f909](https://github.com/antialias/soroban-abacus-flashcards/commit/db9f9096b446b078e1b4dfe970723bef54a6f4ae))
+* properly separate LocalMemoryPairsProvider and RoomMemoryPairsProvider ([98822ec](https://github.com/antialias/soroban-abacus-flashcards/commit/98822ecda52bf004d9950e3f4c92c834fd820e49))
+
+## [2.12.3](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.12.2...v2.12.3) (2025-10-09)
+
+
+### Bug Fixes
+
+* always show game control buttons in room-based sessions ([14ba422](https://github.com/antialias/soroban-abacus-flashcards/commit/14ba422919abd648e2a134ce167a5e6fd9f84e73))
+
+## [2.12.2](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.12.1...v2.12.2) (2025-10-09)
+
+
+### Bug Fixes
+
+* use RoomMemoryPairsProvider in room page ([c279731](https://github.com/antialias/soroban-abacus-flashcards/commit/c27973191f0144604e17a8a14adf0a88df476e27))
+
+## [2.12.1](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.12.0...v2.12.1) (2025-10-09)
+
+
+### Bug Fixes
+
+* export MemoryPairsContext to fix provider hook error ([80ad33e](https://github.com/antialias/soroban-abacus-flashcards/commit/80ad33eec0b6946702eaa9cf1b1c246852864b00))
+
+## [2.12.0](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.11.0...v2.12.0) (2025-10-09)
+
+
+### Features
+
+* add networked hover state infrastructure for multiplayer presence ([d149799](https://github.com/antialias/soroban-abacus-flashcards/commit/d14979907c5df9b793a1c110028fc5b54457f507))
+
+## [2.11.0](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.10.1...v2.11.0) (2025-10-09)
+
+
+### Features
+
+* add pause/resume game state architecture ([05eacac](https://github.com/antialias/soroban-abacus-flashcards/commit/05eacac438dbaf405ce91e188c53dbbe2e9f9507))
+* add Resume button and config change warning to setup UI ([b5ee04f](https://github.com/antialias/soroban-abacus-flashcards/commit/b5ee04f57651f53517468fcc4c456f0ccb65a8e2))
+* implement pause/resume in game providers with optimistic updates ([ce30fca](https://github.com/antialias/soroban-abacus-flashcards/commit/ce30fcaf55270f9089249bd13ba73a25fbfa5ab4))
+
+
+### Bug Fixes
+
+* convert guestId to internal userId for player ownership check ([3a01f46](https://github.com/antialias/soroban-abacus-flashcards/commit/3a01f4637d2081c66fe37c7f8cfee229442ec744))
+* implement shared session architecture for room-based multiplayer ([2856f4b](https://github.com/antialias/soroban-abacus-flashcards/commit/2856f4b83fbcc6483d96cc6e7da2fe5bc911625d))
+
+## [2.10.2](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.10.1...v2.10.2) (2025-10-09)
+
+
+### Bug Fixes
+
+* convert guestId to internal userId for player ownership check ([3a01f46](https://github.com/antialias/soroban-abacus-flashcards/commit/3a01f4637d2081c66fe37c7f8cfee229442ec744))
+* implement shared session architecture for room-based multiplayer ([2856f4b](https://github.com/antialias/soroban-abacus-flashcards/commit/2856f4b83fbcc6483d96cc6e7da2fe5bc911625d))
+
+## [2.10.1](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.10.0...v2.10.1) (2025-10-09)
+
+
+### Bug Fixes
+
+* enforce player ownership authorization for multiplayer games ([71b0aac](https://github.com/antialias/soroban-abacus-flashcards/commit/71b0aac13c970c03fe8d296d41e9472ad72a00fa))
+
+## [2.10.0](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.9.0...v2.10.0) (2025-10-09)
+
+
+### Features
+
+* implement rich Radix UI tooltips for player avatars ([d03c789](https://github.com/antialias/soroban-abacus-flashcards/commit/d03c7898799b378f912f47d7267a00bc7ce3d580))
+
+## [2.9.0](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.8.7...v2.9.0) (2025-10-09)
+
+
+### Features
+
+* implement auto-save for player settings modal ([a83dc09](https://github.com/antialias/soroban-abacus-flashcards/commit/a83dc097e43c265a297281da54754f58ac831754))
+
+## [2.8.7](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.8.6...v2.8.7) (2025-10-09)
+
+
+### Bug Fixes
+
+* enable real-time player name updates across room members ([5171be3](https://github.com/antialias/soroban-abacus-flashcards/commit/5171be3d37980eb1c98aa0d1e1d6e06f589763d1))
+
+## [2.8.6](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.8.5...v2.8.6) (2025-10-09)
+
+
+### Bug Fixes
+
+* prevent duplicate display of network avatars in nav ([d474ef0](https://github.com/antialias/soroban-abacus-flashcards/commit/d474ef07d69cf0b4f5dedd404616e3bbee7289fe))
+
+## [2.8.5](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.8.4...v2.8.5) (2025-10-09)
+
+
+### Bug Fixes
+
+* remove redirect loop by not redirecting from room page ([10cf715](https://github.com/antialias/soroban-abacus-flashcards/commit/10cf71527f7cede7fd93e502dbfc59df99b5a524))
+
+## [2.8.4](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.8.3...v2.8.4) (2025-10-09)
+
+
+### Bug Fixes
+
+* prevent redirect loops by checking if already at target URL ([c5268b7](https://github.com/antialias/soroban-abacus-flashcards/commit/c5268b79dee66aa02e14e2024fe1c6242a172ed3))
+
+## [2.8.3](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.8.2...v2.8.3) (2025-10-08)
+
+
+### Bug Fixes
+
+* remove ArcadeGuardedPage from room page to prevent redirect loop ([4686f59](https://github.com/antialias/soroban-abacus-flashcards/commit/4686f59d245b2b502dc0764c223a5ce84bf1af44))
+
+## [2.8.2](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.8.1...v2.8.2) (2025-10-08)
+
+
+### Bug Fixes
+
+* revert to showing only active players in room games ([87cc0b6](https://github.com/antialias/soroban-abacus-flashcards/commit/87cc0b64fb5f3debaf1d2f122aecfefc62922fed))
+
+## [2.8.1](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.8.0...v2.8.1) (2025-10-08)
+
+
+### Bug Fixes
+
+* include all players from room members in room games ([28a2e7d](https://github.com/antialias/soroban-abacus-flashcards/commit/28a2e7d6511e70b83adf7d0465789a91026bc1f7))
+
+## [2.8.0](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.7.4...v2.8.0) (2025-10-08)
+
+
+### Features
+
+* implement room-wide multi-user game state synchronization ([8175c43](https://github.com/antialias/soroban-abacus-flashcards/commit/8175c43533c474fff48eb128c97747033bfb434a))
+
+
+### Tests
+
+* add comprehensive tests for arcade guard and room navigation ([b49630f](https://github.com/antialias/soroban-abacus-flashcards/commit/b49630f3cb02ebbac75b4680948bbface314dccb))
+
+## [2.7.4](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.7.3...v2.7.4) (2025-10-08)
+
+
+### Bug Fixes
+
+* respect enabled flag in useArcadeGuard WebSocket redirects ([01ff114](https://github.com/antialias/soroban-abacus-flashcards/commit/01ff114258ff7ab43ef2bd79b41c7035fe02ac70))
+
+
+### Code Refactoring
+
+* move room management pages to /arcade-rooms ([4316687](https://github.com/antialias/soroban-abacus-flashcards/commit/431668729cfb145d6e0c13947de2a82f27fa400d))
+
 ## [2.7.3](https://github.com/antialias/soroban-abacus-flashcards/compare/v2.7.2...v2.7.3) (2025-10-08)


--- a/32
+++ b/32
@@ -34,20 +34,44 @@ RUN turbo build --filter=@soroban/web
 FROM node:18-alpine AS runner
 WORKDIR /app

+# Install Python and build tools for better-sqlite3 (needed at runtime)
+RUN apk add --no-cache python3 py3-setuptools make g++
+
 # Create non-root user
 RUN addgroup --system --gid 1001 nodejs
 RUN adduser --system --uid 1001 nextjs

-# Copy built application
-COPY --from=builder --chown=nextjs:nodejs /app/apps/web/.next/standalone ./
-COPY --from=builder --chown=nextjs:nodejs /app/apps/web/.next/static ./apps/web/.next/static
+# Copy built Next.js application
+COPY --from=builder --chown=nextjs:nodejs /app/apps/web/.next ./apps/web/.next
 COPY --from=builder --chown=nextjs:nodejs /app/apps/web/public ./apps/web/public

+# Copy server files (compiled from TypeScript)
+COPY --from=builder --chown=nextjs:nodejs /app/apps/web/server.js ./apps/web/
+COPY --from=builder --chown=nextjs:nodejs /app/apps/web/socket-server.js ./apps/web/
+COPY --from=builder --chown=nextjs:nodejs /app/apps/web/src ./apps/web/src
+
+# Copy database migrations
+COPY --from=builder --chown=nextjs:nodejs /app/apps/web/drizzle ./apps/web/drizzle
+
+# Copy node_modules (for dependencies)
+COPY --from=builder --chown=nextjs:nodejs /app/node_modules ./node_modules
+COPY --from=builder --chown=nextjs:nodejs /app/apps/web/node_modules ./apps/web/node_modules
+
+# Copy package.json files for module resolution
+COPY --from=builder --chown=nextjs:nodejs /app/package.json ./
+COPY --from=builder --chown=nextjs:nodejs /app/apps/web/package.json ./apps/web/
+
 # Set up environment
+WORKDIR /app/apps/web
+
+# Create data directory for SQLite database
+RUN mkdir -p data && chown nextjs:nodejs data
+
 USER nextjs
 EXPOSE 3000
 ENV PORT 3000
 ENV HOSTNAME "0.0.0.0"
+ENV NODE_ENV production

 # Start the application
-CMD ["node", "apps/web/server.js"]
+CMD ["node", "server.js"]
--- a/apps/web/.claude/ARCADE_ARCHITECTURE.md
+++ b/apps/web/.claude/ARCADE_ARCHITECTURE.md
@@ -0,0 +1,492 @@
+# Arcade Game Architecture
+
+## Overview
+
+The arcade system supports two distinct game modes that must remain completely isolated from each other:
+
+1. **Local Play** - Games without network synchronization (can be single-player OR local multiplayer)
+2. **Room-Based Play** - Networked games with real-time synchronization across room members
+
+## Core Terminology
+
+Following `docs/terminology-user-player-room.md`:
+
+- **USER** - Identity (guest or authenticated account), retrieved via `useViewerId()`, one per browser/account
+- **PLAYER** - Game avatar/profile (e.g., "Alice 👧", "Bob 👦"), stored in `players` table
+- **PLAYER ROSTER** - All PLAYERS belonging to a USER (can have many)
+- **ACTIVE PLAYERS** - PLAYERS where `isActive = true` - these are the ones that actually participate in games
+- **ROOM MEMBER** - A USER's participation in a multiplayer room (tracked in `room_members` table)
+
+**Important:** A USER can have many PLAYERS in their roster, but only the ACTIVE PLAYERS (where `isActive = true`) participate in games. This enables "hot-potato" style local multiplayer where multiple people share the same device. This is LOCAL play (not networked), even though multiple PLAYERS participate.
+
+In arcade sessions:
+- `arcade_sessions.userId` - The USER who owns the session
+- `arcade_sessions.activePlayers` - Array of PLAYER IDs (only active players with `isActive = true`)
+- `arcade_sessions.roomId` - If present, the room ID for networked play (references `arcade_rooms.id`)
+
+## Critical Architectural Requirements
+
+### 1. Mode Isolation (MUST ENFORCE)
+
+**Local Play** (`/arcade/[game-name]`)
+- MUST NOT sync game state across the network
+- MUST NOT use room data, even if the USER is currently a member of an active room
+- MUST create isolated, per-USER game sessions
+- Game state lives only in the current browser tab/session
+- CAN have multiple ACTIVE PLAYERS from the same USER (local multiplayer / hot-potato)
+- State is NOT shared across the network, only within the browser session
+
+**Room-Based Play** (`/arcade/room`)
+- MUST sync game state across all room members via network
+- MUST use the USER's current active room
+- MUST coordinate moves via server WebSocket
+- Game state is shared across all ACTIVE PLAYERS from all USERS in the room
+- When a PLAYER makes a move, all room members see it in real-time
+- CAN ALSO have multiple ACTIVE PLAYERS per USER (networked + local multiplayer combined)
+
+### 2. Room ID Usage Rules
+
+```typescript
+// ❌ WRONG: Always checking for room data
+const { roomData } = useRoomData()
+useArcadeSession({ roomId: roomData?.id })  // This causes the bug!
+
+// ✅ CORRECT: Explicit mode control via separate providers
+<LocalMemoryPairsProvider>     {/* Never passes roomId */}
+<RoomMemoryPairsProvider>       {/* Always passes roomId */}
+```
+
+**Key principle:** The presence of a `roomId` parameter in `useArcadeSession` determines synchronization behavior:
+- `roomId` present → room-wide network sync enabled (room-based play)
+- `roomId` undefined → local play only (no network sync)
+
+### 3. Composition Over Flags (PREFERRED APPROACH)
+
+**✅ Option 1: Separate Providers (CLEAREST - USE THIS)**
+
+Create two distinct provider components:
+
+```typescript
+// context/LocalMemoryPairsProvider.tsx
+export function LocalMemoryPairsProvider({ children }) {
+  const { data: viewerId } = useViewerId()
+  const { activePlayers } = useGameMode()  // Gets active players (isActive = true)
+  // NEVER fetch room data for local play
+
+  const { state, sendMove } = useArcadeSession<MemoryPairsState>({
+    userId: viewerId || '',
+    roomId: undefined,  // Explicitly undefined - no network sync
+    initialState,
+    applyMove: applyMoveOptimistically,
+  })
+
+  // ... rest of provider logic
+  // Note: activePlayers contains only PLAYERS with isActive = true
+}
+
+// context/RoomMemoryPairsProvider.tsx
+export function RoomMemoryPairsProvider({ children }) {
+  const { data: viewerId } = useViewerId()
+  const { roomData } = useRoomData()  // OK to fetch for room-based play
+  const { activePlayers } = useGameMode()  // Gets active players (isActive = true)
+
+  const { state, sendMove } = useArcadeSession<MemoryPairsState>({
+    userId: viewerId || '',
+    roomId: roomData?.id,  // Pass roomId for network sync
+    initialState,
+    applyMove: applyMoveOptimistically,
+  })
+
+  // ... rest of provider logic
+}
+```
+
+Then use them explicitly:
+```typescript
+// /arcade/matching/page.tsx (Local Play)
+export default function MatchingPage() {
+  return (
+    <ArcadeGuardedPage>
+      <LocalMemoryPairsProvider>
+        <MemoryPairsGame />
+      </LocalMemoryPairsProvider>
+    </ArcadeGuardedPage>
+  )
+}
+
+// /arcade/room/page.tsx (Room-Based Play)
+export default function RoomPage() {
+  // ... room validation logic
+  if (roomData.gameName === 'matching') {
+    return (
+      <RoomMemoryPairsProvider>
+        <MemoryPairsGame />
+      </RoomMemoryPairsProvider>
+    )
+  }
+}
+```
+
+**Benefits of separate providers:**
+- Compile-time safety - impossible to mix modes
+- Clear intent - any developer can see which mode at a glance
+- No runtime conditionals needed
+- Easier to test - each provider tests separately
+
+**❌ Avoid:** Runtime flag checking scattered throughout code
+```typescript
+// Anti-pattern: Too many conditionals
+if (isRoomBased) { ... } else { ... }
+```
+
+### 4. How Synchronization Works
+
+#### Local Play Flow
+```
+USER Action → useArcadeSession (roomId: undefined)
+           → WebSocket emit('join-arcade-session', { userId })
+           → Server creates isolated session for userId
+           → Session key = userId
+           → session.activePlayers = USER's active player IDs (isActive = true)
+           → State changes only affect this USER's browser tabs
+
+Note: Multiple ACTIVE PLAYERS from same USER can participate (local multiplayer),
+      but state is NEVER synced across network
+```
+
+#### Room-Based Play Flow
+```
+USER Action (on behalf of PLAYER)
+         → useArcadeSession (roomId: 'room_xyz')
+         → WebSocket emit('join-arcade-session', { userId, roomId })
+         → Server creates/joins shared session for roomId
+         → session.activePlayers = ALL active players from ALL room members
+         → Socket joins TWO rooms: `arcade:${userId}` AND `game:${roomId}`
+         → PLAYER makes move
+         → Server validates PLAYER ownership (is this PLAYER owned by this USER?)
+         → State changes broadcast to:
+            - arcade:${userId} - All tabs of this USER (for optimistic reconciliation)
+            - game:${roomId} - All USERS in the room (for network sync)
+
+Note: Each USER can still have multiple ACTIVE PLAYERS (local + networked multiplayer)
+```
+
+The server-side logic uses `roomId` to determine session scope:
+- No `roomId`: Session key = `userId` (isolated to USER's browser)
+- With `roomId`: Session key = `roomId` (shared across all room members)
+
+See `docs/MULTIPLAYER_SYNC_ARCHITECTURE.md` for detailed socket room mechanics.
+
+### 5. USER vs PLAYER in Game Logic
+
+**Important distinction:**
+- **Session ownership**: Tracked by USER ID (`useViewerId()`)
+- **Player roster**: All PLAYERS for a USER (can be many)
+- **Active players**: PLAYERS with `isActive = true` (these join the game)
+- **Game actions**: Performed by PLAYER ID (from `players` table)
+- **Move validation**: Server checks that PLAYER ID belongs to the requesting USER
+- **Local multiplayer**: One USER with multiple ACTIVE PLAYERS (hot-potato style, same device)
+- **Networked multiplayer**: Multiple USERS, each with their own ACTIVE PLAYERS, in a room
+
+```typescript
+// ✅ Correct: USER owns session, ACTIVE PLAYERS participate
+const { data: viewerId } = useViewerId()  // USER ID
+const { activePlayers } = useGameMode()   // ACTIVE PLAYER IDs (isActive = true)
+
+// activePlayers might be [player_001, player_002]
+// even though USER has 5 total PLAYERS in their roster
+
+const { state, sendMove } = useArcadeSession({
+  userId: viewerId,  // Session owned by USER
+  roomId: undefined, // Local play (or roomData?.id for room-based)
+  // ...
+})
+
+// When PLAYER flips card:
+sendMove({
+  type: 'FLIP_CARD',
+  playerId: currentPlayerId,  // PLAYER ID from activePlayers
+  data: { cardId: '...' }
+})
+```
+
+**Example Scenarios:**
+
+1. **Single-player local game:**
+   - USER: "guest_abc"
+   - Player roster: ["player_001" (active), "player_002" (inactive), "player_003" (inactive)]
+   - Active PLAYERS in game: ["player_001"]
+   - Mode: Local play (no roomId)
+
+2. **Local multiplayer (hot-potato):**
+   - USER: "guest_abc"
+   - Player roster: ["player_001" (active), "player_002" (active), "player_003" (active), "player_004" (inactive)]
+   - Active PLAYERS in game: ["player_001", "player_002", "player_003"] (3 kids sharing device)
+   - Mode: Local play (no roomId)
+   - Game rotates turns between the 3 active PLAYERS, but NO network sync
+
+3. **Room-based networked play:**
+   - USER A: "guest_abc"
+     - Player roster: 5 total PLAYERS
+     - Active PLAYERS: ["player_001", "player_002"]
+   - USER B: "guest_def"
+     - Player roster: 3 total PLAYERS
+     - Active PLAYERS: ["player_003"]
+   - Mode: Room-based play (roomId: "room_xyz")
+   - Total PLAYERS in game: 3 (player_001, player_002, player_003)
+   - All 3 synced across network
+
+4. **Room-based + local multiplayer combined:**
+   - USER A: "guest_abc" with 3 active PLAYERS (3 kids at Device A)
+   - USER B: "guest_def" with 2 active PLAYERS (2 kids at Device B)
+   - Mode: Room-based play (roomId: "room_xyz")
+   - 5 total active PLAYERS across 2 devices, all synced over network
+
+## Common Mistakes to Avoid
+
+### Mistake 1: Conditional Room Usage
+```typescript
+// ❌ BAD: Room sync leaks into local play
+const { roomData } = useRoomData()
+useArcadeSession({
+  roomId: roomData?.id  // Local play will sync if USER is in a room!
+})
+```
+
+### Mistake 2: Shared Components Without Mode Context
+```typescript
+// ❌ BAD: Same provider used for both modes
+export default function LocalGamePage() {
+  return <GameProvider><Game /></GameProvider>  // Which mode?
+}
+```
+
+### Mistake 3: Confusing "multiplayer" with "networked"
+```typescript
+// ❌ BAD: Thinking multiple PLAYERS means room-based
+if (activePlayers.length > 1) {
+  // Must be room-based!  WRONG!
+  // Could be local multiplayer (hot-potato style)
+}
+
+// ✅ CORRECT: Check for roomId to determine network sync
+const isNetworked = !!roomId
+const isLocalMultiplayer = activePlayers.length > 1 && !roomId
+```
+
+### Mistake 4: Using all PLAYERS instead of only active ones
+```typescript
+// ❌ BAD: Including inactive players
+const allPlayers = await db.query.players.findMany({
+  where: eq(players.userId, userId)
+})
+
+// ✅ CORRECT: Only active players join the game
+const activePlayers = await db.query.players.findMany({
+  where: and(
+    eq(players.userId, userId),
+    eq(players.isActive, true)
+  )
+})
+```
+
+### Mistake 5: Mixing USER ID and PLAYER ID
+```typescript
+// ❌ BAD: Using USER ID for game actions
+sendMove({
+  type: 'FLIP_CARD',
+  playerId: viewerId,  // WRONG! viewerId is USER ID, not PLAYER ID
+  data: { cardId: '...' }
+})
+
+// ✅ CORRECT: Use PLAYER ID from game state
+sendMove({
+  type: 'FLIP_CARD',
+  playerId: state.currentPlayer,  // PLAYER ID from activePlayers
+  data: { cardId: '...' }
+})
+```
+
+### Mistake 6: Server-Side Ambiguity
+```typescript
+// ❌ BAD: Server can't distinguish intent
+socket.on('join-arcade-session', ({ userId, roomId }) => {
+  // If roomId exists, did USER want local or room-based play?
+  // This happens when provider always passes roomData?.id
+})
+```
+
+## Testing Requirements
+
+Tests MUST verify mode isolation:
+
+### Local Play Tests
+```typescript
+it('should NOT sync state when USER is in a room but playing locally', async () => {
+  // Setup: USER is a member of an active room
+  // Action: USER navigates to /arcade/matching
+  // Assert: Game state is NOT shared with other room members
+  // Assert: Other room members' actions do NOT affect this game
+})
+
+it('should create isolated sessions for concurrent local games', () => {
+  // Setup: Two USERS who are members of the same room
+  // Action: Both navigate to /arcade/matching separately
+  // Assert: Each has independent game state
+  // Assert: USER A's moves do NOT appear in USER B's game
+})
+
+it('should support local multiplayer without network sync', () => {
+  // Setup: USER with 3 active PLAYERS in roster (hot-potato style)
+  // Action: USER plays at /arcade/matching with the 3 active PLAYERS
+  // Assert: All 3 active PLAYERS participate in the same session
+  // Assert: Inactive PLAYERS do NOT participate
+  // Assert: State is NOT synced across network
+  // Assert: Game rotates turns between active PLAYERS locally
+})
+
+it('should only include active players in game', () => {
+  // Setup: USER has 5 PLAYERS in roster, but only 2 are active
+  // Action: USER starts a local game
+  // Assert: Only the 2 active PLAYERS are in activePlayers array
+  // Assert: Inactive PLAYERS are not included
+})
+
+it('should sync across USER tabs but not across network', () => {
+  // Setup: USER opens /arcade/matching in 2 browser tabs
+  // Action: PLAYER makes move in Tab 1
+  // Assert: Tab 2 sees the move (multi-tab sync)
+  // Assert: Other USERS do NOT see the move (no network sync)
+})
+```
+
+### Room-Based Play Tests
+```typescript
+it('should sync state across all room members', async () => {
+  // Setup: Two USERS are members of the same room
+  // Action: USER A's PLAYER flips card at /arcade/room
+  // Assert: USER B sees the card flip in real-time
+})
+
+it('should sync across multiple active PLAYERS from multiple USERS', () => {
+  // Setup: USER A has 2 active PLAYERS, USER B has 1 active PLAYER in same room
+  // Action: USER A's PLAYER 1 makes move
+  // Assert: All 3 PLAYERS see the move (networked)
+})
+
+it('should only include active players in room games', () => {
+  // Setup: USER A (5 PLAYERS, 2 active), USER B (3 PLAYERS, 1 active) join room
+  // Action: Game starts
+  // Assert: session.activePlayers = [userA_player1, userA_player2, userB_player1]
+  // Assert: Inactive PLAYERS are NOT included
+})
+
+it('should handle combined local + networked multiplayer', () => {
+  // Setup: USER A (3 active PLAYERS), USER B (2 active PLAYERS) in same room
+  // Action: Any PLAYER makes a move
+  // Assert: All 5 active PLAYERS see the move across both devices
+})
+
+it('should fail gracefully when no room exists', () => {
+  // Setup: USER is not a member of any room
+  // Action: Navigate to /arcade/room
+  // Assert: Shows "No active room" message
+  // Assert: Does not create a session
+})
+
+it('should validate PLAYER ownership', async () => {
+  // Setup: USER A in room with active PLAYER 'alice'
+  // Action: USER A attempts move for PLAYER 'bob' (owned by USER B)
+  // Assert: Server rejects the move
+  // Assert: Error indicates unauthorized PLAYER
+})
+```
+
+## Implementation Checklist
+
+When adding a new game or modifying existing ones:
+
+- [ ] Create separate `LocalGameProvider` and `RoomGameProvider` components
+- [ ] Local provider never calls `useRoomData()`
+- [ ] Local provider passes `roomId: undefined` to `useArcadeSession`
+- [ ] Room provider calls `useRoomData()` and passes `roomId: roomData?.id`
+- [ ] Both providers use `useGameMode()` to get active players
+- [ ] Local play page uses `LocalGameProvider`
+- [ ] `/arcade/room` page uses `RoomGameProvider`
+- [ ] Game components correctly use PLAYER IDs (not USER IDs) for moves
+- [ ] Game supports multiple active PLAYERS from same USER (local multiplayer)
+- [ ] Inactive PLAYERS are never included in game sessions
+- [ ] Tests verify mode isolation (local doesn't network sync, room-based does)
+- [ ] Tests verify PLAYER ownership validation
+- [ ] Tests verify only active PLAYERS participate
+- [ ] Tests verify local multiplayer works (multiple active PLAYERS, one USER)
+- [ ] Documentation updated if behavior changes
+
+## File Organization
+
+```
+src/app/arcade/
+├── [game-name]/                    # Local play games
+│   ├── page.tsx                   # Uses LocalGameProvider
+│   └── context/
+│       ├── LocalGameProvider.tsx  # roomId: undefined
+│       └── RoomGameProvider.tsx   # roomId: roomData?.id
+├── room/                           # Room-based play
+│   └── page.tsx                   # Uses RoomGameProvider
+└── ...
+```
+
+## Architecture Decision Records
+
+### Why separate providers instead of auto-detect from route?
+
+While we could detect mode based on the route (`/arcade/room` vs `/arcade/matching`), separate providers are clearer and prevent accidental misuse. Future developers can immediately see the intent, and the type system can enforce correctness.
+
+### Why being in a room doesn't mean all games sync?
+
+A USER being a room member does NOT mean all their games should network sync. They should be able to play local games while remaining in a room for future room-based sessions. Mode is determined by the page they're on, not their room membership status.
+
+### Why not use a single shared provider with mode props?
+
+We tried that. It led to the current bug where local play accidentally synced with rooms. Separate providers make the distinction compile-time safe rather than runtime conditional, and eliminate the possibility of accidentally passing `roomId` when we shouldn't.
+
+### Why do we track sessions by USER but moves by PLAYER?
+
+- **Sessions** are per-USER because each USER can have their own game session
+- **Moves** are per-PLAYER because PLAYERS are the game avatars that score points
+- **Only active PLAYERS** (isActive = true) participate in games
+- This allows:
+  - One USER with multiple active PLAYERS (local multiplayer / hot-potato)
+  - Multiple USERS in one room (networked play)
+  - Combined: Multiple USERS each with multiple active PLAYERS (local + networked)
+  - Proper ownership validation (server checks USER owns PLAYER)
+  - PLAYERS can be toggled active/inactive without deleting them
+
+### Why use "local" vs "room-based" instead of "solo" vs "multiplayer"?
+
+- **"Solo"** is misleading - a USER can have multiple active PLAYERS in local play (hot-potato style)
+- **"Multiplayer"** is ambiguous - it could mean local multiplayer OR networked multiplayer
+- **"Local play"** clearly means: no network sync (but can have multiple active PLAYERS)
+- **"Room-based play"** clearly means: network sync across room members
+
+## Related Files
+
+- `src/hooks/useArcadeSession.ts` - Session management with optional roomId
+- `src/hooks/useArcadeSocket.ts` - WebSocket connection with sync logic (socket rooms: `arcade:${userId}` and `game:${roomId}`)
+- `src/hooks/useRoomData.ts` - Fetches USER's current room membership
+- `src/hooks/useViewerId.ts` - Retrieves current USER ID
+- `src/contexts/GameModeContext.tsx` - Provides active PLAYER information
+- `src/app/arcade/matching/context/ArcadeMemoryPairsContext.tsx` - Game context (needs refactoring to separate providers)
+- `src/app/arcade/matching/page.tsx` - Local play entry point
+- `src/app/arcade/room/page.tsx` - Room-based play entry point
+- `docs/terminology-user-player-room.md` - Terminology guide (USER/PLAYER/MEMBER)
+- `docs/MULTIPLAYER_SYNC_ARCHITECTURE.md` - Technical details of room-based sync
+
+## Version History
+
+- **2025-10-09**: Initial documentation
+  - Issue identified: Local play was syncing with rooms over network
+  - Root cause: Same provider always fetched `roomData` and passed `roomId` to `useArcadeSession`
+  - Solution: Separate providers for local vs room-based play
+  - Terminology clarification: "local" vs "room-based" (not "solo" vs "multiplayer")
+  - Active players: Only PLAYERS with `isActive = true` participate in games
--- a/apps/web/.claude/ARCADE_SETUP_PATTERN.md
+++ b/apps/web/.claude/ARCADE_SETUP_PATTERN.md
@@ -0,0 +1,416 @@
+# Arcade Setup Pattern
+
+## Overview
+
+This document describes the **standard synchronized setup pattern** for arcade games. Following this pattern ensures that:
+
+1. ✅ **Setup is synchronized** - All room members see the same setup screen and config changes in real-time
+2. ✅ **No local state hacks** - Configuration lives entirely in session state, no React state merging
+3. ✅ **Optimistic updates** - Config changes feel instant with client-side prediction
+4. ✅ **Consistent pattern** - All games follow the same architecture
+
+**Reference Implementation**: `src/app/arcade/matching/*` (Matching game)
+
+---
+
+## Core Concept
+
+Setup configuration is **game state**, not UI state. Configuration changes are **moves** that are validated, synchronized, and can be made by any room member.
+
+### Key Principles
+
+1. **Game state includes configuration** during ALL phases (setup, playing, results)
+2. **No local React state** for configuration - use session state directly
+3. **Standard move types** that all games should implement
+4. **Setup phase is collaborative** - any room member can configure the game
+
+---
+
+## Required Move Types
+
+Every arcade game must support these standard moves:
+
+### 1. `GO_TO_SETUP`
+
+Transitions game to setup phase, allowing reconfiguration.
+
+```typescript
+{
+  type: 'GO_TO_SETUP',
+  playerId: string,
+  data: {}
+}
+```
+
+**Behavior:**
+- Can be called from any phase (setup, playing, results)
+- Sets `gamePhase: 'setup'`
+- Resets game progression (scores, cards, etc.)
+- Preserves configuration (players can modify it)
+- Synchronized across all room members
+
+### 2. `SET_CONFIG`
+
+Updates a configuration field during setup phase.
+
+```typescript
+{
+  type: 'SET_CONFIG',
+  playerId: string,
+  data: {
+    field: string,  // Config field name
+    value: any      // New value
+  }
+}
+```
+
+**Behavior:**
+- Only allowed during setup phase
+- Validates field name and value
+- Updates immediately with optimistic update
+- Synchronized across all room members
+
+### 3. `START_GAME`
+
+Starts the game with current configuration.
+
+```typescript
+{
+  type: 'START_GAME',
+  playerId: string,
+  data: {
+    activePlayers: string[],
+    playerMetadata: { [playerId: string]: PlayerMetadata },
+    // ... game-specific initial data
+  }
+}
+```
+
+**Behavior:**
+- Only allowed during setup phase
+- Uses current session state configuration
+- Initializes game-specific state
+- Sets `gamePhase: 'playing'`
+
+---
+
+## Implementation Checklist
+
+### 1. Update Validation Types
+
+Add move types to your game's validation types:
+
+```typescript
+// src/lib/arcade/validation/types.ts
+
+export interface YourGameGoToSetupMove extends GameMove {
+  type: 'GO_TO_SETUP'
+  data: Record<string, never>
+}
+
+export interface YourGameSetConfigMove extends GameMove {
+  type: 'SET_CONFIG'
+  data: {
+    field: 'configField1' | 'configField2' | 'configField3'
+    value: any
+  }
+}
+
+export type YourGameMove =
+  | YourGameStartGameMove
+  | YourGameGoToSetupMove
+  | YourGameSetConfigMove
+  | ... // other game-specific moves
+```
+
+### 2. Implement Validators
+
+Add validators for setup moves in your game's validator class:
+
+```typescript
+// src/lib/arcade/validation/YourGameValidator.ts
+
+export class YourGameValidator implements GameValidator<YourGameState, YourGameMove> {
+  validateMove(state, move, context) {
+    switch (move.type) {
+      case 'GO_TO_SETUP':
+        return this.validateGoToSetup(state)
+
+      case 'SET_CONFIG':
+        return this.validateSetConfig(state, move.data.field, move.data.value)
+
+      case 'START_GAME':
+        return this.validateStartGame(state, move.data)
+
+      // ... other moves
+    }
+  }
+
+  private validateGoToSetup(state: YourGameState): ValidationResult {
+    return {
+      valid: true,
+      newState: {
+        ...state,
+        gamePhase: 'setup',
+        // Reset game progression, preserve configuration
+        // ... reset scores, game data, etc.
+      },
+    }
+  }
+
+  private validateSetConfig(
+    state: YourGameState,
+    field: string,
+    value: any
+  ): ValidationResult {
+    // Only during setup
+    if (state.gamePhase !== 'setup') {
+      return { valid: false, error: 'Cannot change config outside setup' }
+    }
+
+    // Validate field-specific values
+    switch (field) {
+      case 'configField1':
+        if (!isValidValue(value)) {
+          return { valid: false, error: 'Invalid value' }
+        }
+        break
+      // ... validate other fields
+    }
+
+    return {
+      valid: true,
+      newState: { ...state, [field]: value },
+    }
+  }
+
+  private validateStartGame(state: YourGameState, data: any): ValidationResult {
+    if (state.gamePhase !== 'setup') {
+      return { valid: false, error: 'Can only start from setup' }
+    }
+
+    // Use current state configuration to initialize game
+    const initialGameData = initializeYourGame(state.configField1, state.configField2)
+
+    return {
+      valid: true,
+      newState: {
+        ...state,
+        gamePhase: 'playing',
+        ...initialGameData,
+      },
+    }
+  }
+}
+```
+
+### 3. Add Optimistic Updates
+
+Update `applyMoveOptimistically` in your providers:
+
+```typescript
+// src/app/arcade/your-game/context/YourGameProvider.tsx
+
+function applyMoveOptimistically(state: YourGameState, move: GameMove): YourGameState {
+  switch (move.type) {
+    case 'GO_TO_SETUP':
+      return {
+        ...state,
+        gamePhase: 'setup',
+        // Reset game state, preserve config
+      }
+
+    case 'SET_CONFIG':
+      const { field, value } = move.data
+      return {
+        ...state,
+        [field]: value,
+      }
+
+    case 'START_GAME':
+      return {
+        ...state,
+        gamePhase: 'playing',
+        // ... initialize game data from move
+      }
+
+    // ... other moves
+  }
+}
+```
+
+### 4. Remove Local State from Providers
+
+**❌ OLD PATTERN (Don't do this):**
+
+```typescript
+// DON'T: Local React state for configuration
+const [localDifficulty, setLocalDifficulty] = useState(6)
+
+// DON'T: Merge hack
+const effectiveState = state.gamePhase === 'setup'
+  ? { ...state, difficulty: localDifficulty }
+  : state
+
+// DON'T: Direct setter
+const setDifficulty = (value) => setLocalDifficulty(value)
+```
+
+**✅ NEW PATTERN (Do this):**
+
+```typescript
+// DO: Use session state directly
+const { state, sendMove } = useArcadeSession(...)
+
+// DO: Send move for config changes
+const setDifficulty = useCallback((value) => {
+  const playerId = activePlayers[0] || ''
+  sendMove({
+    type: 'SET_CONFIG',
+    playerId,
+    data: { field: 'difficulty', value },
+  })
+}, [activePlayers, sendMove])
+
+// DO: Use state directly (no merging!)
+const contextValue = { state: { ...state, gameMode }, ... }
+```
+
+### 5. Update Action Creators
+
+All configuration actions should send moves:
+
+```typescript
+export function YourGameProvider({ children }) {
+  const { state, sendMove } = useArcadeSession(...)
+
+  const setConfigField = useCallback((value) => {
+    const playerId = activePlayers[0] || ''
+    sendMove({
+      type: 'SET_CONFIG',
+      playerId,
+      data: { field: 'configField', value },
+    })
+  }, [activePlayers, sendMove])
+
+  const goToSetup = useCallback(() => {
+    const playerId = activePlayers[0] || state.currentPlayer || ''
+    sendMove({
+      type: 'GO_TO_SETUP',
+      playerId,
+      data: {},
+    })
+  }, [activePlayers, state.currentPlayer, sendMove])
+
+  const startGame = useCallback(() => {
+    // Use current session state config (not local state!)
+    const initialData = initializeGame(state.config1, state.config2)
+
+    const playerId = activePlayers[0]
+    sendMove({
+      type: 'START_GAME',
+      playerId,
+      data: {
+        ...initialData,
+        activePlayers,
+        playerMetadata: capturePlayerMetadata(players, activePlayers),
+      },
+    })
+  }, [state.config1, state.config2, activePlayers, sendMove])
+
+  return <YourGameContext.Provider value={...} />
+}
+```
+
+---
+
+## Benefits of This Pattern
+
+### 1. **Synchronized Setup**
+- User A clicks "Setup" → All room members see setup screen
+- User B changes difficulty → All room members see the change
+- User A clicks "Start" → All room members start playing
+
+### 2. **No Special Cases**
+- Setup works like gameplay (moves + validation)
+- No conditional logic based on phase
+- No React state merging hacks
+
+### 3. **Easy to Extend**
+- New games copy the same pattern
+- Well-documented and tested
+- Consistent developer experience
+
+### 4. **Optimistic Updates**
+- Config changes feel instant
+- Client-side prediction + server validation
+- Rollback on validation failure
+
+---
+
+## Testing Checklist
+
+When implementing this pattern, test these scenarios:
+
+### Local Mode
+- [ ] Click setup button during game → returns to setup
+- [ ] Change config fields → updates immediately
+- [ ] Start game → uses current config
+
+### Room Mode (Multi-User)
+- [ ] User A clicks setup → User B sees setup screen
+- [ ] User A changes difficulty → User B sees change in real-time
+- [ ] User B changes game type → User A sees change in real-time
+- [ ] User A starts game → Both users see game with same config
+
+### Edge Cases
+- [ ] Change config rapidly → no race conditions
+- [ ] User with 0 players can see/modify setup
+- [ ] Setup → Play → Setup preserves last config
+- [ ] Invalid config values are rejected by validator
+
+---
+
+## Migration Guide
+
+If you have an existing game using local state, follow these steps:
+
+### Step 1: Add Move Types
+Add `GO_TO_SETUP` and `SET_CONFIG` to your validation types.
+
+### Step 2: Implement Validators
+Add validators for the new moves in your game validator class.
+
+### Step 3: Add Optimistic Updates
+Update `applyMoveOptimistically` to handle the new moves.
+
+### Step 4: Remove Local State
+1. Delete all `useState` calls for configuration
+2. Delete the `effectiveState` merging logic
+3. Update action creators to send moves instead
+
+### Step 5: Test
+Run through the testing checklist above.
+
+---
+
+## Reference Implementation
+
+See the Matching game for a complete reference implementation:
+
+- **Types**: `src/lib/arcade/validation/types.ts`
+- **Validator**: `src/lib/arcade/validation/MatchingGameValidator.ts`
+- **Provider**: `src/app/arcade/matching/context/RoomMemoryPairsProvider.tsx`
+- **Optimistic Updates**: `applyMoveOptimistically` function in provider
+
+Look for comments marked with:
+- `// STANDARD ARCADE PATTERN: GO_TO_SETUP`
+- `// STANDARD ARCADE PATTERN: SET_CONFIG`
+- `// NO LOCAL STATE`
+- `// NO MORE effectiveState merging!`
+
+---
+
+## Questions?
+
+If something is unclear or you encounter issues implementing this pattern, refer to the Matching game implementation or update this document with clarifications.
--- a/apps/web/.claude/settings.local.json
+++ b/apps/web/.claude/settings.local.json
@@ -1,41 +1,17 @@
 {
  "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 test:*)",
+      "Read(//Users/antialias/projects/**)",
      "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 add:*)",
      "Bash(git commit:*)",
-      "Bash(npm run pre-commit:*)",
-      "Bash(npm run:*)",
+      "Bash(git push:*)",
      "Bash(git pull:*)",
      "Bash(git stash:*)",
-      "Bash(members of the room\" requirement for room-based gameplay.\n\n🤖 Generated with [Claude Code](https://claude.com/claude-code)\n\nCo-Authored-By: Claude <noreply@anthropic.com>\nEOF\n)\")"
+      "Bash(npm run format:*)",
+      "Bash(npm run pre-commit:*)",
+      "Bash(npm run type-check:*)"
    ],
    "deny": [],
    "ask": []
--- a/apps/web/docs/MULTIPLAYER_SYNC_ARCHITECTURE.md
+++ b/apps/web/docs/MULTIPLAYER_SYNC_ARCHITECTURE.md
@@ -0,0 +1,490 @@
+# Multiplayer Synchronization Architecture
+
+## Current State: Single-User Multi-Tab Sync
+
+### How it Works
+
+**Client-Side Flow:**
+
+1. User opens game in Tab A and Tab B
+2. Both tabs create WebSocket connections via `useArcadeSocket()`
+3. Both emit `join-arcade-session` with `userId`
+4. Server adds both sockets to `arcade:${userId}` room
+
+**When User Makes a Move (from Tab A):**
+
+```typescript
+// Client (Tab A)
+sendMove({ type: 'FLIP_CARD', playerId: 'player-1', data: { cardId: 'card-5' } })
+
+// Optimistic update applied locally
+state = applyMoveOptimistically(state, move)
+
+// Socket emits to server
+socket.emit('game-move', { userId, move })
+```
+
+**Server Processing:**
+
+```typescript
+// socket-server.ts line 71
+socket.on('game-move', async (data) => {
+  // Validate move
+  const result = await applyGameMove(data.userId, data.move)
+
+  if (result.success) {
+    // ✅ Broadcast to ALL tabs of this user
+    io.to(`arcade:${data.userId}`).emit('move-accepted', {
+      gameState: result.session.gameState,
+      version: result.session.version,
+      move: data.move
+    })
+  }
+})
+```
+
+**Both Tabs Receive Update:**
+
+```typescript
+// Client (Tab A and Tab B)
+socket.on('move-accepted', (data) => {
+  // Update server state
+  optimistic.handleMoveAccepted(data.gameState, data.version, data.move)
+
+  // Tab A: Remove from pending queue (was optimistic)
+  // Tab B: Just sync with server state (wasn't expecting it)
+})
+```
+
+### Key Components
+
+1. **`useOptimisticGameState`** - Manages optimistic updates
+   - Keeps `serverState` (last confirmed by server)
+   - Keeps `pendingMoves[]` (not yet confirmed)
+   - Current state = serverState + all pending moves applied
+
+2. **`useArcadeSession`** - Combines socket + optimistic state
+   - Connects socket
+   - Applies moves optimistically
+   - Sends moves to server
+   - Handles server responses
+
+3. **Socket Rooms** - Server-side broadcast channels
+   - `arcade:${userId}` - All tabs of one user
+   - Each socket can be in multiple rooms
+   - `io.to(room).emit()` broadcasts to all sockets in that room
+
+4. **Session Storage** - Database
+   - One session per user (userId is unique key)
+   - Contains `gameState`, `version`, `roomId`
+   - Optimistic locking via version number
+
+---
+
+## Required: Room-Based Multi-User Sync
+
+### The Goal
+
+Multiple users in the same room at `/arcade/room` should all see synchronized game state:
+
+- User A (2 tabs): Tab A1, Tab A2
+- User B (1 tab): Tab B1
+- User C (2 tabs): Tab C1, Tab C2
+
+When User A makes a move in Tab A1:
+- **All of User A's tabs** see the move (Tab A1, Tab A2)
+- **All of User B's tabs** see the move (Tab B1)
+- **All of User C's tabs** see the move (Tab C1, Tab C2)
+
+### The Challenge
+
+Current architecture only broadcasts within one user:
+```typescript
+// ❌ Only reaches User A's tabs
+io.to(`arcade:${userA}`).emit('move-accepted', ...)
+```
+
+We need to broadcast to the entire room:
+```typescript
+// ✅ Reaches all users in the room
+io.to(`game:${roomId}`).emit('move-accepted', ...)
+```
+
+### The Solution
+
+#### 1. Add Room-Based Game Socket Room
+
+When a user joins `/arcade/room`, they join TWO socket rooms:
+
+```typescript
+// socket-server.ts - extend join-arcade-session
+socket.on('join-arcade-session', async ({ userId, roomId }) => {
+  // Join user's personal room (for multi-tab sync)
+  socket.join(`arcade:${userId}`)
+
+  // If this session is part of a room, also join the game room
+  if (roomId) {
+    socket.join(`game:${roomId}`)
+    console.log(`🎮 User ${userId} joined game room ${roomId}`)
+  }
+
+  // Send current session state...
+})
+```
+
+#### 2. Broadcast to Both Rooms
+
+When processing moves for room-based sessions:
+
+```typescript
+// socket-server.ts - modify game-move handler
+socket.on('game-move', async (data) => {
+  const result = await applyGameMove(data.userId, data.move)
+
+  if (result.success && result.session) {
+    const moveAcceptedData = {
+      gameState: result.session.gameState,
+      version: result.session.version,
+      move: data.move,
+    }
+
+    // Broadcast to user's own tabs (for optimistic update reconciliation)
+    io.to(`arcade:${data.userId}`).emit('move-accepted', moveAcceptedData)
+
+    // If this is a room-based session, ALSO broadcast to all room members
+    if (result.session.roomId) {
+      io.to(`game:${result.session.roomId}`).emit('move-accepted', moveAcceptedData)
+      console.log(`📢 Broadcasted move to room ${result.session.roomId}`)
+    }
+  }
+})
+```
+
+**Why broadcast to both?**
+- `arcade:${userId}` - So the acting user's tabs can reconcile their optimistic updates
+- `game:${roomId}` - So all other users in the room receive the update
+
+#### 3. Client Handles Own vs. Other Moves
+
+The client already handles this correctly via optimistic updates:
+
+```typescript
+// User A (Tab A1) - Makes move
+sendMove({ type: 'FLIP_CARD', ... })
+// → Applies optimistically immediately
+// → Sends to server
+// → Receives move-accepted
+// → Reconciles: removes from pending queue
+
+// User B (Tab B1) - Sees move from User A
+// → Receives move-accepted (unexpected)
+// → Reconciles: clears pending queue, syncs with server state
+// → Result: sees User A's move immediately
+```
+
+The beauty is that `handleMoveAccepted()` already handles both cases:
+- **Own move**: Remove from pending queue
+- **Other's move**: Clear pending queue (since server state is now ahead)
+
+#### 4. Pass roomId in join-arcade-session
+
+Client needs to send roomId when joining:
+
+```typescript
+// hooks/useArcadeSocket.ts
+const joinSession = useCallback((userId: string, roomId?: string) => {
+  if (!socket) return
+  socket.emit('join-arcade-session', { userId, roomId })
+}, [socket])
+
+// hooks/useArcadeSession.ts
+useEffect(() => {
+  if (connected && autoJoin && userId) {
+    // Get roomId from session or room context
+    const roomId = getRoomId() // Need to provide this
+    joinSession(userId, roomId)
+  }
+}, [connected, autoJoin, userId, joinSession])
+```
+
+---
+
+## Implementation Plan
+
+### Phase 1: Server-Side Changes
+
+**File: `socket-server.ts`**
+
+1. ✅ Accept `roomId` in `join-arcade-session` event
+   ```typescript
+   socket.on('join-arcade-session', async ({ userId, roomId }) => {
+     socket.join(`arcade:${userId}`)
+
+     // Join game room if session is room-based
+     if (roomId) {
+       socket.join(`game:${roomId}`)
+     }
+
+     // Rest of logic...
+   })
+   ```
+
+2. ✅ Broadcast to room in `game-move` handler
+   ```typescript
+   if (result.success && result.session) {
+     const moveData = {
+       gameState: result.session.gameState,
+       version: result.session.version,
+       move: data.move,
+     }
+
+     // Broadcast to user's tabs
+     io.to(`arcade:${data.userId}`).emit('move-accepted', moveData)
+
+     // ALSO broadcast to room if room-based session
+     if (result.session.roomId) {
+       io.to(`game:${result.session.roomId}`).emit('move-accepted', moveData)
+     }
+   }
+   ```
+
+3. ✅ Handle room disconnects
+   ```typescript
+   socket.on('disconnect', () => {
+     // Leave all rooms (handled automatically by socket.io)
+     // But log for debugging
+     if (currentUserId && currentRoomId) {
+       console.log(`User ${currentUserId} left game room ${currentRoomId}`)
+     }
+   })
+   ```
+
+### Phase 2: Client-Side Changes
+
+**File: `hooks/useArcadeSocket.ts`**
+
+1. ✅ Add roomId parameter to joinSession
+   ```typescript
+   export interface UseArcadeSocketReturn {
+     // ... existing
+     joinSession: (userId: string, roomId?: string) => void
+   }
+
+   const joinSession = useCallback((userId: string, roomId?: string) => {
+     if (!socket) return
+     socket.emit('join-arcade-session', { userId, roomId })
+   }, [socket])
+   ```
+
+**File: `hooks/useArcadeSession.ts`**
+
+2. ✅ Accept roomId in options
+   ```typescript
+   export interface UseArcadeSessionOptions<TState> {
+     userId: string
+     roomId?: string // NEW
+     initialState: TState
+     applyMove: (state: TState, move: GameMove) => TState
+     // ... rest
+   }
+
+   export function useArcadeSession<TState>(options: UseArcadeSessionOptions<TState>) {
+     const { userId, roomId, ...optimisticOptions } = options
+
+     // Auto-join with roomId
+     useEffect(() => {
+       if (connected && autoJoin && userId) {
+         joinSession(userId, roomId)
+       }
+     }, [connected, autoJoin, userId, roomId, joinSession])
+
+     // ... rest
+   }
+   ```
+
+**File: `app/arcade/matching/context/ArcadeMemoryPairsContext.tsx`**
+
+3. ✅ Get roomId from room data and pass to session
+   ```typescript
+   import { useRoomData } from '@/hooks/useRoomData'
+
+   export function ArcadeMemoryPairsProvider({ children }: { children: ReactNode }) {
+     const { data: viewerId } = useViewerId()
+     const { roomData } = useRoomData()
+
+     // Arcade session integration
+     const { state, sendMove, ... } = useArcadeSession<MemoryPairsState>({
+       userId: viewerId || '',
+       roomId: roomData?.id, // NEW - pass room ID
+       initialState,
+       applyMove: applyMoveOptimistically,
+     })
+
+     // ... rest stays the same
+   }
+   ```
+
+### Phase 3: Testing
+
+1. **Multi-Tab Test (Single User)**
+   - Open `/arcade/room` in 2 tabs as User A
+   - Make move in Tab 1
+   - Verify Tab 2 updates immediately
+
+2. **Multi-User Test (Different Users)**
+   - User A opens `/arcade/room` in 1 tab
+   - User B opens `/arcade/room` in 1 tab (same room)
+   - User A makes move
+   - Verify User B sees move immediately
+
+3. **Multi-User Multi-Tab Test**
+   - User A: 2 tabs (Tab A1, Tab A2)
+   - User B: 2 tabs (Tab B1, Tab B2)
+   - User A makes move in Tab A1
+   - Verify all 4 tabs update
+
+4. **Rapid Move Test**
+   - User A and User B both make moves rapidly
+   - Verify no conflicts
+   - Verify all moves are processed in order
+
+---
+
+## Edge Cases to Handle
+
+### 1. User Leaves Room Mid-Game
+
+**Current behavior:** Session persists, user can rejoin
+
+**Required behavior:**
+- If user leaves room (HTTP POST to `/api/arcade/rooms/[roomId]/leave`):
+  - Delete their session
+  - Emit `session-ended` to their tabs
+  - Other users continue playing
+
+### 2. Version Conflicts
+
+**Already handled** by optimistic locking:
+- Each move increments version
+- Client tracks server version
+- If conflict detected, reconciliation happens automatically
+
+### 3. Session Without Room
+
+**Already handled** by session-manager.ts:
+- Sessions without `roomId` are considered orphaned
+- They're cleaned up on next access (lines 111-115)
+
+### 4. Multiple Users Same Move
+
+**Handled by server validation:**
+- Server processes moves sequentially
+- First valid move wins
+- Second move gets rejected if it's now invalid
+- Client rolls back rejected move
+
+---
+
+## Benefits of This Architecture
+
+1. **Reuses existing optimistic update system**
+   - No changes needed to client-side optimistic logic
+   - Already handles own vs. others' moves
+
+2. **Minimal changes required**
+   - Add `roomId` parameter (3 places)
+   - Add one `io.to()` broadcast (1 place)
+   - Wire up roomId from context (1 place)
+
+3. **Backward compatible**
+   - Non-room sessions still work (roomId is optional)
+   - Solo play unaffected
+
+4. **Scalable**
+   - Socket.io handles multiple rooms efficiently
+   - No N² broadcasting (room-based is O(N))
+
+5. **Already tested pattern**
+   - Multi-tab sync proves the broadcast pattern works
+   - Just extending to more sockets (different users)
+
+---
+
+## Security Considerations
+
+### 1. Validate Room Membership
+
+Before processing moves, verify user is in the room:
+
+```typescript
+// session-manager.ts - in applyGameMove()
+const session = await getArcadeSession(userId)
+
+if (session.roomId) {
+  // Verify user is a member of this room
+  const membership = await getRoomMember(session.roomId, userId)
+  if (!membership) {
+    return { success: false, error: 'User not in room' }
+  }
+}
+```
+
+### 2. Verify Player Ownership
+
+Ensure users can only make moves for their own players:
+
+```typescript
+// Already handled in validator
+// move.playerId must be in session.activePlayers
+// activePlayers are owned by the userId making the move
+```
+
+This is already enforced by how activePlayers are set up in the room.
+
+---
+
+## Performance Considerations
+
+### 1. Broadcasting Overhead
+
+- **Current**: 1 user × N tabs = N broadcasts per move
+- **New**: M users × N tabs each = (M×N) broadcasts per move
+- **Impact**: Linear with room size, not quadratic
+- **Acceptable**: Socket.io is optimized for this
+
+### 2. Database Queries
+
+- No change: Still 1 database write per move
+- Session is stored per-user, not per-room
+- Room data is separate (cached, not updated per move)
+
+### 3. Memory
+
+- Each socket joins 2 rooms instead of 1
+- Negligible: Socket.io uses efficient room data structures
+
+---
+
+## Testing Checklist
+
+### Unit Tests
+
+- [ ] `useArcadeSocket` accepts and passes roomId
+- [ ] `useArcadeSession` accepts and passes roomId
+- [ ] Server joins `game:${roomId}` room when roomId provided
+
+### Integration Tests
+
+- [ ] Single user, 2 tabs: both tabs sync
+- [ ] 2 users, 1 tab each: both users sync
+- [ ] 2 users, 2 tabs each: all 4 tabs sync
+- [ ] User leaves room: session deleted, others continue
+- [ ] Rapid concurrent moves: all processed correctly
+
+### Manual Tests
+
+- [ ] Open room in 2 browsers (different users)
+- [ ] Play full game to completion
+- [ ] Verify scores sync correctly
+- [ ] Verify turn changes sync correctly
+- [ ] Verify game completion syncs correctly
--- a/apps/web/next.config.js
+++ b/apps/web/next.config.js
@@ -1,6 +1,5 @@
 /** @type {import('next').NextConfig} */
 const nextConfig = {
-  output: 'standalone',
  eslint: {
    ignoreDuringBuilds: true,
  },
--- a/apps/web/package.json
+++ b/apps/web/package.json
@@ -3,8 +3,8 @@
  "version": "0.1.0",
  "private": true,
  "scripts": {
-    "dev": "concurrently \"node server.js\" \"npx @pandacss/dev --watch\"",
-    "build": "node scripts/generate-build-info.js && next build",
+    "dev": "tsc -p tsconfig.server.json && tsc-alias -p tsconfig.server.json && concurrently \"node server.js\" \"npx @pandacss/dev --watch\"",
+    "build": "node scripts/generate-build-info.js && tsc -p tsconfig.server.json && tsc-alias -p tsconfig.server.json && 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",
@@ -90,6 +90,7 @@
    "happy-dom": "^18.0.1",
    "jsdom": "^27.0.0",
    "storybook": "^9.1.7",
+    "tsc-alias": "^1.8.16",
    "tsx": "^4.20.5",
    "typescript": "^5.0.0",
    "vitest": "^1.0.0"
--- a/apps/web/pnpm-lock.yaml
+++ b/apps/web/pnpm-lock.yaml
@@ -0,0 +1,445 @@
+lockfileVersion: '9.0'
+
+settings:
+  autoInstallPeers: true
+  excludeLinksFromLockfile: false
+
+importers:
+
+  .:
+    dependencies:
+      '@radix-ui/react-tooltip':
+        specifier: ^1.2.8
+        version: 1.2.8(react-dom@18.3.1(react@18.3.1))(react@18.3.1)
+      '@soroban/abacus-react':
+        specifier: workspace:*
+        version: link:../../packages/abacus-react
+      '@soroban/client':
+        specifier: workspace:*
+        version: link:../../packages/core/client/typescript
+      '@soroban/core':
+        specifier: workspace:*
+        version: link:../../packages/core/client/node
+      '@soroban/templates':
+        specifier: workspace:*
+        version: link:../../packages/templates
+      react:
+        specifier: ^18.2.0
+        version: 18.3.1
+      react-dom:
+        specifier: ^18.2.0
+        version: 18.3.1(react@18.3.1)
+
+packages:
+
+  '@floating-ui/core@1.7.3':
+    resolution: {integrity: sha512-sGnvb5dmrJaKEZ+LDIpguvdX3bDlEllmv4/ClQ9awcmCZrlx5jQyyMWFM5kBI+EyNOCDDiKk8il0zeuX3Zlg/w==}
+
+  '@floating-ui/dom@1.7.4':
+    resolution: {integrity: sha512-OOchDgh4F2CchOX94cRVqhvy7b3AFb+/rQXyswmzmGakRfkMgoWVjfnLWkRirfLEfuD4ysVW16eXzwt3jHIzKA==}
+
+  '@floating-ui/react-dom@2.1.6':
+    resolution: {integrity: sha512-4JX6rEatQEvlmgU80wZyq9RT96HZJa88q8hp0pBd+LrczeDI4o6uA2M+uvxngVHo4Ihr8uibXxH6+70zhAFrVw==}
+    peerDependencies:
+      react: '>=16.8.0'
+      react-dom: '>=16.8.0'
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+  scheduler@0.23.2:
+    dependencies:
+      loose-envify: 1.4.0
--- a/apps/web/server.js
+++ b/apps/web/server.js
@@ -11,9 +11,8 @@ 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')
+const { db } = require('./src/db/index.js')

 try {
  migrate(db, { migrationsFolder: './drizzle' })
@@ -35,9 +34,8 @@ app.prepare().then(() => {
    }
  })

-  // Initialize Socket.IO (load TypeScript with tsx)
-  require('tsx/cjs')
-  const { initializeSocketServer } = require('./socket-server.ts')
+  // Initialize Socket.IO
+  const { initializeSocketServer } = require('./socket-server.js')
  initializeSocketServer(server)

  server
--- a/apps/web/socket-server.js
+++ b/apps/web/socket-server.js
@@ -0,0 +1,319 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.getSocketIO = getSocketIO;
+exports.initializeSocketServer = initializeSocketServer;
+const socket_io_1 = require("socket.io");
+const session_manager_1 = require("./src/lib/arcade/session-manager");
+const room_manager_1 = require("./src/lib/arcade/room-manager");
+const room_membership_1 = require("./src/lib/arcade/room-membership");
+const player_manager_1 = require("./src/lib/arcade/player-manager");
+const MatchingGameValidator_1 = require("./src/lib/arcade/validation/MatchingGameValidator");
+/**
+ * Get the socket.io server instance
+ * Returns null if not initialized
+ */
+function getSocketIO() {
+    return globalThis.__socketIO || null;
+}
+function initializeSocketServer(httpServer) {
+    const io = new socket_io_1.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);
+        let currentUserId = null;
+        // Join arcade session room
+        socket.on('join-arcade-session', async ({ userId, roomId }) => {
+            currentUserId = userId;
+            socket.join(`arcade:${userId}`);
+            console.log(`👤 User ${userId} joined arcade room`);
+            // If this session is part of a room, also join the game room for multi-user sync
+            if (roomId) {
+                socket.join(`game:${roomId}`);
+                console.log(`🎮 User ${userId} joined game room ${roomId}`);
+            }
+            // Send current session state if exists
+            // For room-based games, look up shared room session
+            try {
+                const session = roomId
+                    ? await (0, session_manager_1.getArcadeSessionByRoom)(roomId)
+                    : await (0, session_manager_1.getArcadeSession)(userId);
+                if (session) {
+                    console.log('[join-arcade-session] Found session:', {
+                        userId,
+                        roomId,
+                        version: session.version,
+                        sessionUserId: session.userId,
+                    });
+                    socket.emit('session-state', {
+                        gameState: session.gameState,
+                        currentGame: session.currentGame,
+                        gameUrl: session.gameUrl,
+                        activePlayers: session.activePlayers,
+                        version: session.version,
+                    });
+                }
+                else {
+                    console.log('[join-arcade-session] No active session found for:', {
+                        userId,
+                        roomId,
+                    });
+                    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) => {
+            console.log('🎮 Game move received:', {
+                userId: data.userId,
+                moveType: data.move.type,
+                playerId: data.move.playerId,
+                timestamp: data.move.timestamp,
+                roomId: data.roomId,
+                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') {
+                    // For room-based games, check if room session exists
+                    const existingSession = data.roomId
+                        ? await (0, session_manager_1.getArcadeSessionByRoom)(data.roomId)
+                        : await (0, session_manager_1.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?.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_1.matchingGameValidator.getInitialState({
+                            difficulty: 6,
+                            gameType: 'abacus-numeral',
+                            turnTimer: 30,
+                        });
+                        // Check if user is already in a room for this game
+                        const userRoomIds = await (0, room_membership_1.getUserRooms)(data.userId);
+                        let room = null;
+                        // Look for an existing active room for this game
+                        for (const roomId of userRoomIds) {
+                            const existingRoom = await (0, room_manager_1.getRoomById)(roomId);
+                            if (existingRoom &&
+                                existingRoom.gameName === 'matching' &&
+                                existingRoom.status !== 'finished') {
+                                room = existingRoom;
+                                console.log('🏠 Using existing room:', room.code);
+                                break;
+                            }
+                        }
+                        // If no suitable room exists, create a new one
+                        if (!room) {
+                            room = await (0, room_manager_1.createRoom)({
+                                name: 'Auto-generated Room',
+                                createdBy: data.userId,
+                                creatorName: 'Player',
+                                gameName: 'matching',
+                                gameConfig: {
+                                    difficulty: 6,
+                                    gameType: 'abacus-numeral',
+                                    turnTimer: 30,
+                                },
+                                ttlMinutes: 60,
+                            });
+                            console.log('🏠 Created new room:', room.code);
+                        }
+                        // Now create the session linked to the room
+                        await (0, session_manager_1.createArcadeSession)({
+                            userId: data.userId,
+                            gameName: 'matching',
+                            gameUrl: '/arcade/room', // Room-based sessions use /arcade/room
+                            initialState,
+                            activePlayers,
+                            roomId: room.id,
+                        });
+                        console.log('✅ Session created successfully with room association');
+                        // Notify all connected clients about the new session
+                        const newSession = await (0, session_manager_1.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');
+                        }
+                    }
+                }
+                // Apply game move - use roomId for room-based games to access shared session
+                const result = await (0, session_manager_1.applyGameMove)(data.userId, data.move, data.roomId);
+                if (result.success && result.session) {
+                    const moveAcceptedData = {
+                        gameState: result.session.gameState,
+                        version: result.session.version,
+                        move: data.move,
+                    };
+                    // Broadcast the updated state to all devices for this user
+                    io.to(`arcade:${data.userId}`).emit('move-accepted', moveAcceptedData);
+                    // If this is a room-based session, ALSO broadcast to all users in the room
+                    if (result.session.roomId) {
+                        io.to(`game:${result.session.roomId}`).emit('move-accepted', moveAcceptedData);
+                        console.log(`📢 Broadcasted move to game room ${result.session.roomId}`);
+                    }
+                    // Update activity timestamp
+                    await (0, session_manager_1.updateSessionActivity)(data.userId);
+                }
+                else {
+                    // Send rejection only to the requesting socket
+                    socket.emit('move-rejected', {
+                        error: result.error,
+                        move: data.move,
+                        versionConflict: result.versionConflict,
+                    });
+                }
+            }
+            catch (error) {
+                console.error('Error processing move:', error);
+                socket.emit('move-rejected', {
+                    error: 'Server error processing move',
+                    move: data.move,
+                });
+            }
+        });
+        // Handle session exit
+        socket.on('exit-arcade-session', async ({ userId }) => {
+            console.log('🚪 User exiting arcade session:', userId);
+            try {
+                await (0, session_manager_1.deleteArcadeSession)(userId);
+                io.to(`arcade:${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 }) => {
+            try {
+                await (0, session_manager_1.updateSessionActivity)(userId);
+                socket.emit('pong-session');
+            }
+            catch (error) {
+                console.error('Error updating activity:', error);
+            }
+        });
+        // Room: Join
+        socket.on('join-room', async ({ roomId, userId }) => {
+            console.log(`🏠 User ${userId} joining room ${roomId}`);
+            try {
+                // Join the socket room
+                socket.join(`room:${roomId}`);
+                // Mark member as online
+                await (0, room_membership_1.setMemberOnline)(roomId, userId, true);
+                // Get room data
+                const members = await (0, room_membership_1.getRoomMembers)(roomId);
+                const memberPlayers = await (0, player_manager_1.getRoomActivePlayers)(roomId);
+                // Convert memberPlayers Map to object for JSON serialization
+                const memberPlayersObj = {};
+                for (const [uid, players] of memberPlayers.entries()) {
+                    memberPlayersObj[uid] = players;
+                }
+                // Send current room state to the joining user
+                socket.emit('room-joined', {
+                    roomId,
+                    members,
+                    memberPlayers: memberPlayersObj,
+                });
+                // Notify all other members in the room
+                socket.to(`room:${roomId}`).emit('member-joined', {
+                    roomId,
+                    userId,
+                    members,
+                    memberPlayers: memberPlayersObj,
+                });
+                console.log(`✅ User ${userId} joined room ${roomId}`);
+            }
+            catch (error) {
+                console.error('Error joining room:', error);
+                socket.emit('room-error', { error: 'Failed to join room' });
+            }
+        });
+        // Room: Leave
+        socket.on('leave-room', async ({ roomId, userId }) => {
+            console.log(`🚪 User ${userId} leaving room ${roomId}`);
+            try {
+                // Leave the socket room
+                socket.leave(`room:${roomId}`);
+                // Mark member as offline
+                await (0, room_membership_1.setMemberOnline)(roomId, userId, false);
+                // Get updated members
+                const members = await (0, room_membership_1.getRoomMembers)(roomId);
+                const memberPlayers = await (0, player_manager_1.getRoomActivePlayers)(roomId);
+                // Convert memberPlayers Map to object
+                const memberPlayersObj = {};
+                for (const [uid, players] of memberPlayers.entries()) {
+                    memberPlayersObj[uid] = players;
+                }
+                // Notify remaining members
+                io.to(`room:${roomId}`).emit('member-left', {
+                    roomId,
+                    userId,
+                    members,
+                    memberPlayers: memberPlayersObj,
+                });
+                console.log(`✅ User ${userId} left room ${roomId}`);
+            }
+            catch (error) {
+                console.error('Error leaving room:', error);
+            }
+        });
+        // Room: Players updated
+        socket.on('players-updated', async ({ roomId, userId }) => {
+            console.log(`🎯 Players updated for user ${userId} in room ${roomId}`);
+            try {
+                // Get updated player data
+                const memberPlayers = await (0, player_manager_1.getRoomActivePlayers)(roomId);
+                // Convert memberPlayers Map to object
+                const memberPlayersObj = {};
+                for (const [uid, players] of memberPlayers.entries()) {
+                    memberPlayersObj[uid] = players;
+                }
+                // Broadcast to all members in the room (including sender)
+                io.to(`room:${roomId}`).emit('room-players-updated', {
+                    roomId,
+                    memberPlayers: memberPlayersObj,
+                });
+                console.log(`✅ Broadcasted player updates for room ${roomId}`);
+            }
+            catch (error) {
+                console.error('Error updating room players:', error);
+                socket.emit('room-error', { error: 'Failed to update players' });
+            }
+        });
+        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`);
+            }
+        });
+    });
+    // Store in globalThis to make accessible across module boundaries
+    globalThis.__socketIO = io;
+    console.log('✅ Socket.IO initialized on /api/socket');
+    return io;
+}
--- a/apps/web/socket-server.ts
+++ b/apps/web/socket-server.ts
@@ -6,6 +6,7 @@ import {
  createArcadeSession,
  deleteArcadeSession,
  getArcadeSession,
+  getArcadeSessionByRoom,
  updateSessionActivity,
 } from './src/lib/arcade/session-manager'
 import { createRoom, getRoomById } from './src/lib/arcade/room-manager'
@@ -42,45 +43,72 @@ export function initializeSocketServer(httpServer: HTTPServer) {
    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 ${userId} joined arcade room`)
+    socket.on(
+      'join-arcade-session',
+      async ({ userId, roomId }: { userId: string; roomId?: string }) => {
+        currentUserId = userId
+        socket.join(`arcade:${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')
+        // If this session is part of a room, also join the game room for multi-user sync
+        if (roomId) {
+          socket.join(`game:${roomId}`)
+          console.log(`🎮 User ${userId} joined game room ${roomId}`)
+        }
+
+        // Send current session state if exists
+        // For room-based games, look up shared room session
+        try {
+          const session = roomId
+            ? await getArcadeSessionByRoom(roomId)
+            : await getArcadeSession(userId)
+
+          if (session) {
+            console.log('[join-arcade-session] Found session:', {
+              userId,
+              roomId,
+              version: session.version,
+              sessionUserId: session.userId,
+            })
+            socket.emit('session-state', {
+              gameState: session.gameState,
+              currentGame: session.currentGame,
+              gameUrl: session.gameUrl,
+              activePlayers: session.activePlayers,
+              version: session.version,
+            })
+          } else {
+            console.log('[join-arcade-session] No active session found for:', {
+              userId,
+              roomId,
+            })
+            socket.emit('no-active-session')
+          }
+        } catch (error) {
+          console.error('Error fetching session:', error)
+          socket.emit('session-error', { error: 'Failed to fetch 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 }) => {
+    socket.on('game-move', async (data: { userId: string; move: GameMove; roomId?: string }) => {
      console.log('🎮 Game move received:', {
        userId: data.userId,
        moveType: data.move.type,
        playerId: data.move.playerId,
        timestamp: data.move.timestamp,
+        roomId: data.roomId,
        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)
+          // For room-based games, check if room session exists
+          const existingSession = data.roomId
+            ? await getArcadeSessionByRoom(data.roomId)
+            : await getArcadeSession(data.userId)

          if (!existingSession) {
            console.log('🎯 Creating new session for START_GAME')
@@ -165,15 +193,24 @@ export function initializeSocketServer(httpServer: HTTPServer) {
          }
        }

-        const result = await applyGameMove(data.userId, data.move)
+        // Apply game move - use roomId for room-based games to access shared session
+        const result = await applyGameMove(data.userId, data.move, data.roomId)

        if (result.success && result.session) {
-          // Broadcast the updated state to all devices for this user
-          io!.to(`arcade:${data.userId}`).emit('move-accepted', {
+          const moveAcceptedData = {
            gameState: result.session.gameState,
            version: result.session.version,
            move: data.move,
-          })
+          }
+
+          // Broadcast the updated state to all devices for this user
+          io!.to(`arcade:${data.userId}`).emit('move-accepted', moveAcceptedData)
+
+          // If this is a room-based session, ALSO broadcast to all users in the room
+          if (result.session.roomId) {
+            io!.to(`game:${result.session.roomId}`).emit('move-accepted', moveAcceptedData)
+            console.log(`📢 Broadcasted move to game room ${result.session.roomId}`)
+          }

          // Update activity timestamp
          await updateSessionActivity(data.userId)
--- a/apps/web/src/app/api/arcade/rooms/current/route.ts
+++ b/apps/web/src/app/api/arcade/rooms/current/route.ts
@@ -12,14 +12,11 @@ import { getViewerId } from '@/lib/viewer'
 export async function GET() {
  try {
    const userId = await getViewerId()
-    console.log('[Current Room API] Fetching for user:', userId)

    // Get all rooms user is in (should be at most 1 due to modal room enforcement)
    const roomIds = await getUserRooms(userId)
-    console.log('[Current Room API] User rooms:', roomIds)

    if (roomIds.length === 0) {
-      console.log('[Current Room API] User is not in any room')
      return NextResponse.json({ room: null }, { status: 200 })
    }

@@ -28,7 +25,6 @@ export async function GET() {
    // Get room data
    const room = await getRoomById(roomId)
    if (!room) {
-      console.log('[Current Room API] Room not found:', roomId)
      return NextResponse.json({ error: 'Room not found' }, { status: 404 })
    }

@@ -44,12 +40,6 @@ export async function GET() {
      memberPlayersObj[uid] = players
    }

-    console.log('[Current Room API] Returning room:', {
-      roomId: room.id,
-      roomName: room.name,
-      memberCount: members.length,
-    })
-
    return NextResponse.json({
      room,
      members,
--- a/apps/web/src/app/arcade-rooms/[roomId]/page.tsx
+++ b/apps/web/src/app/arcade-rooms/[roomId]/page.tsx
@@ -3,7 +3,7 @@
 import { useEffect, useState } from 'react'
 import { useParams, useRouter } from 'next/navigation'
 import { io, type Socket } from 'socket.io-client'
-import { css } from '../../../../../styled-system/css'
+import { css } from '../../../../styled-system/css'
 import { PageWithNav } from '@/components/PageWithNav'
 import { useViewerId } from '@/hooks/useViewerId'

@@ -154,8 +154,8 @@ export default function RoomDetailPage() {

  const startGame = () => {
    if (!room) return
-    // Navigate to the game with the room ID
-    router.push(`/arcade/rooms/${roomId}/${room.gameName}`)
+    // Navigate to the room game page
+    router.push('/arcade/room')
  }

  const joinRoom = async () => {
@@ -264,7 +264,7 @@ export default function RoomDetailPage() {
              {error || 'Room not found'}
            </p>
            <button
-              onClick={() => router.push('/arcade/rooms')}
+              onClick={() => router.push('/arcade-rooms')}
              className={css({
                px: '6',
                py: '3',
@@ -325,7 +325,7 @@ export default function RoomDetailPage() {
          >
            <div className={css({ mb: '4' })}>
              <button
-                onClick={() => router.push('/arcade/rooms')}
+                onClick={() => router.push('/arcade-rooms')}
                className={css({
                  display: 'inline-flex',
                  alignItems: 'center',
@@ -621,7 +621,7 @@ export default function RoomDetailPage() {
            ) : (
              <>
                <button
-                  onClick={() => router.push('/arcade/rooms')}
+                  onClick={() => router.push('/arcade-rooms')}
                  className={css({
                    flex: 1,
                    px: '6',
--- a/apps/web/src/app/arcade-rooms/tests/room-navigation.test.tsx
+++ b/apps/web/src/app/arcade-rooms/tests/room-navigation.test.tsx
@@ -0,0 +1,316 @@
+import { render, screen, waitFor } from '@testing-library/react'
+import * as nextNavigation from 'next/navigation'
+import { beforeEach, describe, expect, it, vi } from 'vitest'
+import * as arcadeGuard from '@/hooks/useArcadeGuard'
+import * as roomData from '@/hooks/useRoomData'
+import * as viewerId from '@/hooks/useViewerId'
+
+// Mock Next.js navigation
+vi.mock('next/navigation', () => ({
+  useRouter: vi.fn(),
+  usePathname: vi.fn(),
+  useParams: vi.fn(),
+}))
+
+// Mock hooks
+vi.mock('@/hooks/useArcadeGuard')
+vi.mock('@/hooks/useRoomData')
+vi.mock('@/hooks/useViewerId')
+vi.mock('@/hooks/useUserPlayers', () => ({
+  useUserPlayers: () => ({ data: [], isLoading: false }),
+  useCreatePlayer: () => ({ mutate: vi.fn() }),
+  useUpdatePlayer: () => ({ mutate: vi.fn() }),
+  useDeletePlayer: () => ({ mutate: vi.fn() }),
+}))
+vi.mock('@/hooks/useArcadeSocket', () => ({
+  useArcadeSocket: () => ({
+    connected: false,
+    joinSession: vi.fn(),
+    socket: null,
+    sendMove: vi.fn(),
+    exitSession: vi.fn(),
+    pingSession: vi.fn(),
+  }),
+}))
+
+// Mock styled-system
+vi.mock('../../../../styled-system/css', () => ({
+  css: () => '',
+}))
+
+// Mock components
+vi.mock('@/components/PageWithNav', () => ({
+  PageWithNav: ({ children }: { children: React.ReactNode }) => <div>{children}</div>,
+}))
+
+// Import pages after mocks
+import RoomBrowserPage from '../page'
+
+describe('Room Navigation with Active Sessions', () => {
+  const mockRouter = {
+    push: vi.fn(),
+    replace: vi.fn(),
+    back: vi.fn(),
+  }
+
+  beforeEach(() => {
+    vi.clearAllMocks()
+    vi.spyOn(nextNavigation, 'useRouter').mockReturnValue(mockRouter as any)
+    vi.spyOn(nextNavigation, 'usePathname').mockReturnValue('/arcade-rooms')
+    vi.spyOn(viewerId, 'useViewerId').mockReturnValue({
+      data: 'test-user',
+      isLoading: false,
+      isPending: false,
+      error: null,
+    } as any)
+    global.fetch = vi.fn()
+  })
+
+  describe('RoomBrowserPage', () => {
+    it('should render room browser without redirecting when user has active game session', async () => {
+      // User has an active game session
+      vi.spyOn(arcadeGuard, 'useArcadeGuard').mockReturnValue({
+        hasActiveSession: true,
+        loading: false,
+        activeSession: {
+          gameUrl: '/arcade/room',
+          currentGame: 'matching',
+        },
+      })
+
+      // User is in a room
+      vi.spyOn(roomData, 'useRoomData').mockReturnValue({
+        roomData: {
+          id: 'room-1',
+          name: 'Test Room',
+          code: 'ABC123',
+          gameName: 'matching',
+          members: [],
+          memberPlayers: {},
+        },
+        isLoading: false,
+        isInRoom: true,
+        notifyRoomOfPlayerUpdate: vi.fn(),
+      })
+
+      // Mock rooms API
+      ;(global.fetch as any).mockResolvedValue({
+        ok: true,
+        json: async () => ({
+          rooms: [
+            {
+              id: 'room-1',
+              code: 'ABC123',
+              name: 'Test Room',
+              gameName: 'matching',
+              status: 'lobby',
+              createdAt: new Date(),
+              creatorName: 'Test User',
+              isLocked: false,
+            },
+          ],
+        }),
+      })
+
+      render(<RoomBrowserPage />)
+
+      // Should render the page
+      await waitFor(() => {
+        expect(screen.getByText('🎮 Multiplayer Rooms')).toBeInTheDocument()
+      })
+
+      // Should NOT redirect to /arcade/room
+      expect(mockRouter.push).not.toHaveBeenCalled()
+    })
+
+    it('should NOT redirect when PageWithNav uses arcade guard with enabled=false', async () => {
+      // Simulate PageWithNav calling useArcadeGuard with enabled=false
+      const arcadeGuardSpy = vi.spyOn(arcadeGuard, 'useArcadeGuard')
+
+      // User has an active game session
+      arcadeGuardSpy.mockReturnValue({
+        hasActiveSession: true,
+        loading: false,
+        activeSession: {
+          gameUrl: '/arcade/room',
+          currentGame: 'matching',
+        },
+      })
+
+      vi.spyOn(roomData, 'useRoomData').mockReturnValue({
+        roomData: null,
+        isLoading: false,
+        isInRoom: false,
+        notifyRoomOfPlayerUpdate: vi.fn(),
+      })
+
+      ;(global.fetch as any).mockResolvedValue({
+        ok: true,
+        json: async () => ({ rooms: [] }),
+      })
+
+      render(<RoomBrowserPage />)
+
+      await waitFor(() => {
+        expect(screen.getByText('🎮 Multiplayer Rooms')).toBeInTheDocument()
+      })
+
+      // PageWithNav should have called useArcadeGuard with enabled=false
+      // This is tested in PageWithNav's own tests, but we verify no redirect happened
+      expect(mockRouter.push).not.toHaveBeenCalled()
+    })
+
+    it('should allow navigation to room detail even with active session', async () => {
+      vi.spyOn(arcadeGuard, 'useArcadeGuard').mockReturnValue({
+        hasActiveSession: true,
+        loading: false,
+        activeSession: {
+          gameUrl: '/arcade/room',
+          currentGame: 'matching',
+        },
+      })
+
+      vi.spyOn(roomData, 'useRoomData').mockReturnValue({
+        roomData: null,
+        isLoading: false,
+        isInRoom: false,
+        notifyRoomOfPlayerUpdate: vi.fn(),
+      })
+
+      ;(global.fetch as any).mockResolvedValue({
+        ok: true,
+        json: async () => ({
+          rooms: [
+            {
+              id: 'room-1',
+              code: 'ABC123',
+              name: 'Test Room',
+              gameName: 'matching',
+              status: 'lobby',
+              createdAt: new Date(),
+              creatorName: 'Test User',
+              isLocked: false,
+              isMember: true,
+            },
+          ],
+        }),
+      })
+
+      render(<RoomBrowserPage />)
+
+      await waitFor(() => {
+        expect(screen.getByText('Test Room')).toBeInTheDocument()
+      })
+
+      // Click on the room card
+      const roomCard = screen.getByText('Test Room').parentElement
+      roomCard?.click()
+
+      // Should navigate to room detail, not to /arcade/room
+      await waitFor(() => {
+        expect(mockRouter.push).toHaveBeenCalledWith('/arcade-rooms/room-1')
+      })
+    })
+  })
+
+  describe('Room navigation edge cases', () => {
+    it('should handle rapid navigation between room pages without redirect loops', async () => {
+      vi.spyOn(arcadeGuard, 'useArcadeGuard').mockReturnValue({
+        hasActiveSession: true,
+        loading: false,
+        activeSession: {
+          gameUrl: '/arcade/room',
+          currentGame: 'matching',
+        },
+      })
+
+      vi.spyOn(roomData, 'useRoomData').mockReturnValue({
+        roomData: null,
+        isLoading: false,
+        isInRoom: false,
+        notifyRoomOfPlayerUpdate: vi.fn(),
+      })
+
+      ;(global.fetch as any).mockResolvedValue({
+        ok: true,
+        json: async () => ({ rooms: [] }),
+      })
+
+      const { rerender } = render(<RoomBrowserPage />)
+
+      await waitFor(() => {
+        expect(screen.getByText('🎮 Multiplayer Rooms')).toBeInTheDocument()
+      })
+
+      // Simulate pathname changes (navigating between room pages)
+      vi.spyOn(nextNavigation, 'usePathname').mockReturnValue('/arcade-rooms/room-1')
+      rerender(<RoomBrowserPage />)
+
+      vi.spyOn(nextNavigation, 'usePathname').mockReturnValue('/arcade-rooms')
+      rerender(<RoomBrowserPage />)
+
+      // Should never redirect to game page
+      expect(mockRouter.push).not.toHaveBeenCalledWith('/arcade/room')
+    })
+
+    it('should allow user to leave room and browse other rooms during active game', async () => {
+      // User is in a room with an active game
+      vi.spyOn(arcadeGuard, 'useArcadeGuard').mockReturnValue({
+        hasActiveSession: true,
+        loading: false,
+        activeSession: {
+          gameUrl: '/arcade/room',
+          currentGame: 'matching',
+        },
+      })
+
+      vi.spyOn(roomData, 'useRoomData').mockReturnValue({
+        roomData: {
+          id: 'room-1',
+          name: 'Current Room',
+          code: 'ABC123',
+          gameName: 'matching',
+          members: [],
+          memberPlayers: {},
+        },
+        isLoading: false,
+        isInRoom: true,
+        notifyRoomOfPlayerUpdate: vi.fn(),
+      })
+
+      ;(global.fetch as any).mockResolvedValue({
+        ok: true,
+        json: async () => ({
+          rooms: [
+            {
+              id: 'room-1',
+              name: 'Current Room',
+              code: 'ABC123',
+              gameName: 'matching',
+              status: 'playing',
+              isMember: true,
+            },
+            {
+              id: 'room-2',
+              name: 'Other Room',
+              code: 'DEF456',
+              gameName: 'memory-quiz',
+              status: 'lobby',
+              isMember: false,
+            },
+          ],
+        }),
+      })
+
+      render(<RoomBrowserPage />)
+
+      await waitFor(() => {
+        expect(screen.getByText('Current Room')).toBeInTheDocument()
+        expect(screen.getByText('Other Room')).toBeInTheDocument()
+      })
+
+      // Should be able to view both rooms without redirect
+      expect(mockRouter.push).not.toHaveBeenCalled()
+    })
+  })
+})
--- a/apps/web/src/app/arcade-rooms/page.tsx
+++ b/apps/web/src/app/arcade-rooms/page.tsx
@@ -2,7 +2,7 @@

 import { useEffect, useState } from 'react'
 import { useRouter } from 'next/navigation'
-import { css } from '../../../../styled-system/css'
+import { css } from '../../../styled-system/css'
 import { PageWithNav } from '@/components/PageWithNav'

 interface Room {
@@ -66,7 +66,7 @@ export default function RoomBrowserPage() {
      }

      const data = await response.json()
-      router.push(`/arcade/rooms/${data.room.id}`)
+      router.push(`/arcade-rooms/${data.room.id}`)
    } catch (err) {
      console.error('Failed to create room:', err)
      alert('Failed to create room')
@@ -103,7 +103,7 @@ export default function RoomBrowserPage() {
        // Could show a toast notification here in the future
      }

-      router.push(`/arcade/rooms/${roomId}`)
+      router.push(`/arcade-rooms/${roomId}`)
    } catch (err) {
      console.error('Failed to join room:', err)
      alert('Failed to join room')
@@ -219,7 +219,7 @@ export default function RoomBrowserPage() {
                    })}
                  >
                    <div
-                      onClick={() => router.push(`/arcade/rooms/${room.id}`)}
+                      onClick={() => router.push(`/arcade-rooms/${room.id}`)}
                      className={css({ flex: 1, cursor: 'pointer' })}
                    >
                      <div
--- a/apps/web/src/app/arcade/matching/components/GamePhase.tsx
+++ b/apps/web/src/app/arcade/matching/components/GamePhase.tsx
@@ -3,12 +3,12 @@
 import { css } from '../../../../../styled-system/css'
 import { useGameMode } from '../../../../contexts/GameModeContext'
 import { pluralizeWord } from '../../../../utils/pluralization'
-import { useArcadeMemoryPairs } from '../context/ArcadeMemoryPairsContext'
+import { useMemoryPairs } from '../context/MemoryPairsContext'
 import { MemoryGrid } from './MemoryGrid'
 import { PlayerStatusBar } from './PlayerStatusBar'

 export function GamePhase() {
-  const { state, resetGame: _resetGame, activePlayers } = useArcadeMemoryPairs()
+  const { state, resetGame: _resetGame, activePlayers } = useMemoryPairs()
  const { players: playerMap, activePlayers: activePlayerIds } = useGameMode()

  // Convert Map to array and create mapping from numeric index to player
--- a/apps/web/src/app/arcade/matching/components/MemoryGrid.tsx
+++ b/apps/web/src/app/arcade/matching/components/MemoryGrid.tsx
@@ -1,8 +1,10 @@
 'use client'

-import { useEffect, useMemo, useState } from 'react'
+import { useSpring, animated } from '@react-spring/web'
+import { useEffect, useMemo, useRef, useState } from 'react'
 import { css } from '../../../../../styled-system/css'
-import { useArcadeMemoryPairs } from '../context/ArcadeMemoryPairsContext'
+import { useViewerId } from '@/hooks/useViewerId'
+import { useMemoryPairs } from '../context/MemoryPairsContext'
 import { getGridConfiguration } from '../utils/cardGeneration'
 import { GameCard } from './GameCard'

@@ -80,8 +82,111 @@ function useGridDimensions(gridConfig: any, totalCards: number) {
  return gridDimensions
 }

+// Animated hover avatar component
+function HoverAvatar({
+  playerId,
+  playerInfo,
+  cardElement,
+  isPlayersTurn,
+}: {
+  playerId: string
+  playerInfo: { emoji: string; name: string; color?: string }
+  cardElement: HTMLElement | null
+  isPlayersTurn: boolean
+}) {
+  const [position, setPosition] = useState<{ x: number; y: number } | null>(null)
+  const isFirstRender = useRef(true)
+
+  // Update position when card element changes
+  useEffect(() => {
+    if (cardElement) {
+      const rect = cardElement.getBoundingClientRect()
+      // Calculate the center of the card for avatar positioning
+      const avatarCenterX = rect.left + rect.width / 2
+      const avatarCenterY = rect.top + rect.height / 2
+
+      setPosition({
+        x: avatarCenterX,
+        y: avatarCenterY,
+      })
+    }
+  }, [cardElement])
+
+  // Smooth spring animation for position changes
+  const springProps = useSpring({
+    x: position?.x ?? 0,
+    y: position?.y ?? 0,
+    opacity: position && isPlayersTurn && cardElement ? 1 : 0,
+    config: {
+      tension: 280,
+      friction: 60,
+      mass: 1,
+    },
+    immediate: isFirstRender.current, // Skip animation on first render only
+  })
+
+  // Clear first render flag after initial render
+  useEffect(() => {
+    if (position && isFirstRender.current) {
+      isFirstRender.current = false
+    }
+  }, [position])
+
+  // Don't render until we have a position
+  if (!position) return null
+
+  return (
+    <animated.div
+      style={{
+        position: 'fixed',
+        // Don't use translate, just position directly at the calculated point
+        left: springProps.x.to((x) => `${x}px`),
+        top: springProps.y.to((y) => `${y}px`),
+        opacity: springProps.opacity,
+        width: '80px',
+        height: '80px',
+        marginLeft: '-40px', // Center horizontally (half of width)
+        marginTop: '-40px', // Center vertically (half of height)
+        borderRadius: '50%',
+        background: playerInfo.color || 'linear-gradient(135deg, #667eea, #764ba2)',
+        display: 'flex',
+        alignItems: 'center',
+        justifyContent: 'center',
+        fontSize: '48px',
+        // 3D elevation effect
+        boxShadow:
+          '0 12px 30px rgba(0,0,0,0.5), 0 6px 12px rgba(0,0,0,0.4), 0 0 40px rgba(102, 126, 234, 0.8)',
+        border: '4px solid white',
+        zIndex: 1000,
+        pointerEvents: 'none',
+        filter: 'drop-shadow(0 0 12px rgba(102, 126, 234, 0.9))',
+      }}
+      className={css({
+        animation: 'hoverFloat 2s ease-in-out infinite',
+      })}
+      title={`${playerInfo.name} is considering this card`}
+    >
+      {playerInfo.emoji}
+    </animated.div>
+  )
+}
+
 export function MemoryGrid() {
-  const { state, flipCard } = useArcadeMemoryPairs()
+  const { state, flipCard, hoverCard, gameMode } = useMemoryPairs()
+  const { data: viewerId } = useViewerId()
+
+  // Track card element refs for positioning hover avatars
+  const cardRefs = useRef<Map<string, HTMLElement>>(new Map())
+
+  // Check if it's the local player's turn
+  const isMyTurn = useMemo(() => {
+    if (gameMode === 'single') return true // Always your turn in single player
+
+    // In local games, all players belong to current user, so always their turn
+    // In room games, check if current player belongs to this user
+    const currentPlayerMetadata = state.playerMetadata?.[state.currentPlayer]
+    return currentPlayerMetadata?.userId === viewerId
+  }, [state.currentPlayer, state.playerMetadata, viewerId, gameMode])

  // Hooks must be called before early return
  const gridConfig = useMemo(() => getGridConfiguration(state.difficulty), [state.difficulty])
@@ -95,6 +200,28 @@ export function MemoryGrid() {
    flipCard(cardId)
  }

+  // Get player metadata for hover avatars
+  const getPlayerHoverInfo = (playerId: string) => {
+    // Get player info from game state metadata
+    const player = state.playerMetadata?.[playerId]
+    return player
+      ? {
+          emoji: player.emoji,
+          name: player.name,
+          color: player.color,
+        }
+      : null
+  }
+
+  // Set card ref callback
+  const setCardRef = (cardId: string) => (element: HTMLDivElement | null) => {
+    if (element) {
+      cardRefs.current.set(cardId, element)
+    } else {
+      cardRefs.current.delete(cardId)
+    }
+  }
+
  return (
    <div
      className={css({
@@ -162,6 +289,7 @@ export function MemoryGrid() {
          return (
            <div
              key={card.id}
+              ref={setCardRef(card.id)}
              className={css({
                aspectRatio: '3/4',
                // Fully responsive card sizing - no fixed pixel sizes
@@ -172,7 +300,20 @@ export function MemoryGrid() {
                opacity: isDimmed ? 0.3 : 1,
                transition: 'opacity 0.3s ease',
                filter: isDimmed ? 'grayscale(0.7)' : 'none',
+                position: 'relative',
              })}
+              onMouseEnter={() => {
+                // Only send hover if it's your turn and card is not matched
+                if (hoverCard && !isMatched && isMyTurn) {
+                  hoverCard(card.id)
+                }
+              }}
+              onMouseLeave={() => {
+                // Clear hover state when mouse leaves card
+                if (hoverCard && !isMatched && isMyTurn) {
+                  hoverCard(null)
+                }
+              }}
            >
              <GameCard
                card={card}
@@ -233,23 +374,64 @@ export function MemoryGrid() {
          })}
        />
      )}
+
+      {/* Animated Hover Avatars - Rendered as fixed positioned elements that smoothly transition */}
+      {/* Render one avatar per remote player - key by playerId to keep component alive */}
+      {state.playerHovers &&
+        Object.entries(state.playerHovers)
+          .filter(([playerId]) => {
+            // Don't show your own hover avatar (only show remote players)
+            // In local games, all players belong to this user
+            // In room games, check if player belongs to different user
+            const player = state.playerMetadata?.[playerId]
+            return player?.userId !== viewerId
+          })
+          .map(([playerId, cardId]) => {
+            const playerInfo = getPlayerHoverInfo(playerId)
+            // Get card element if player is hovering (cardId might be null)
+            const cardElement = cardId ? cardRefs.current.get(cardId) : null
+            // Check if it's this player's turn
+            const isPlayersTurn = state.currentPlayer === playerId
+
+            if (!playerInfo) return null
+
+            // Render avatar even if no cardElement (it will handle hiding itself)
+            return (
+              <HoverAvatar
+                key={playerId} // Key by playerId keeps component alive across card changes!
+                playerId={playerId}
+                playerInfo={playerInfo}
+                cardElement={cardElement}
+                isPlayersTurn={isPlayersTurn}
+              />
+            )
+          })}
    </div>
  )
 }

-// Add shake animation for mismatch feedback
-const shakeAnimation = `
+// Add animations for mismatch feedback and hover avatars
+const gridAnimations = `
@keyframes shake {
  0%, 100% { transform: translate(-50%, -50%) translateX(0); }
  25% { transform: translate(-50%, -50%) translateX(-5px); }
  75% { transform: translate(-50%, -50%) translateX(5px); }
 }
+
+@keyframes hoverFloat {
+  0%, 100% {
+    transform: translateY(0px);
+  }
+  50% {
+    transform: translateY(-6px);
+  }
+}
 `

 // Inject animation styles
 if (typeof document !== 'undefined' && !document.getElementById('memory-grid-animations')) {
  const style = document.createElement('style')
  style.id = 'memory-grid-animations'
-  style.textContent = shakeAnimation
+  style.textContent = gridAnimations
  document.head.appendChild(style)
 }
--- a/apps/web/src/app/arcade/matching/components/MemoryPairsGame.tsx
+++ b/apps/web/src/app/arcade/matching/components/MemoryPairsGame.tsx
@@ -3,20 +3,18 @@
 import { useRouter } from 'next/navigation'
 import { useEffect, useRef } from 'react'
 import { PageWithNav } from '@/components/PageWithNav'
-import { useArcadeRedirect } from '@/hooks/useArcadeRedirect'
 import { css } from '../../../../../styled-system/css'
 import { StandardGameLayout } from '../../../../components/StandardGameLayout'
 import { useFullscreen } from '../../../../contexts/FullscreenContext'
-import { useArcadeMemoryPairs } from '../context/ArcadeMemoryPairsContext'
+import { useMemoryPairs } from '../context/MemoryPairsContext'
 import { GamePhase } from './GamePhase'
 import { ResultsPhase } from './ResultsPhase'
 import { SetupPhase } from './SetupPhase'

 export function MemoryPairsGame() {
  const router = useRouter()
-  const { state, exitSession, resetGame } = useArcadeMemoryPairs()
+  const { state, exitSession, resetGame, goToSetup, canModifyPlayers } = useMemoryPairs()
  const { setFullscreenElement } = useFullscreen()
-  const { canModifyPlayers } = useArcadeRedirect({ currentGame: 'matching' })
  const gameRef = useRef<HTMLDivElement>(null)

  useEffect(() => {
@@ -37,11 +35,14 @@ export function MemoryPairsGame() {
        exitSession()
        router.push('/arcade')
      }}
-      onSetup={() => {
-        // Exit current session and return to arcade (which will redirect to setup)
-        exitSession()
-        router.push('/arcade/matching')
-      }}
+      onSetup={
+        goToSetup
+          ? () => {
+              // Transition to setup phase (will pause game if active)
+              goToSetup()
+            }
+          : undefined
+      }
      onNewGame={() => {
        resetGame()
      }}
--- a/apps/web/src/app/arcade/matching/components/PlayerStatusBar.tsx
+++ b/apps/web/src/app/arcade/matching/components/PlayerStatusBar.tsx
@@ -1,21 +1,20 @@
 'use client'

 import { css } from '../../../../../styled-system/css'
-import { useGameMode } from '../../../../contexts/GameModeContext'
 import { gamePlurals } from '../../../../utils/pluralization'
-import { useArcadeMemoryPairs } from '../context/ArcadeMemoryPairsContext'
+import { useMemoryPairs } from '../context/MemoryPairsContext'

 interface PlayerStatusBarProps {
  className?: string
 }

 export function PlayerStatusBar({ className }: PlayerStatusBarProps) {
-  const { players: playerMap, activePlayers: activePlayerIds } = useGameMode()
-  const { state } = useArcadeMemoryPairs()
+  const { state } = useMemoryPairs()

-  // Get active players array
-  const activePlayersData = Array.from(activePlayerIds)
-    .map((id) => playerMap.get(id))
+  // Get active players from game state (not GameModeContext)
+  // This ensures we only show players actually in this game
+  const activePlayersData = state.activePlayers
+    .map((id) => state.playerMetadata?.[id])
    .filter((p): p is NonNullable<typeof p> => p !== undefined)

  // Map active players to display data with scores
@@ -26,8 +25,14 @@ export function PlayerStatusBar({ className }: PlayerStatusBarProps) {
    displayEmoji: player.emoji,
    score: state.scores[player.id] || 0,
    consecutiveMatches: state.consecutiveMatches?.[player.id] || 0,
+    // In local games all players are local, in room games check metadata
+    isLocalPlayer: state.gameMode === 'single' || state.gameMode === 'multiplayer',
  }))

+  // Check if current player is local (your turn) or remote (waiting)
+  const currentPlayer = activePlayers.find((p) => p.id === state.currentPlayer)
+  const isYourTurn = currentPlayer?.isLocalPlayer === true
+
  // Get celebration level based on consecutive matches
  const getCelebrationLevel = (consecutiveMatches: number) => {
    if (consecutiveMatches >= 5) return 'legendary'
@@ -250,14 +255,16 @@ export function PlayerStatusBar({ className }: PlayerStatusBarProps) {
                  {isCurrentPlayer && (
                    <span
                      className={css({
-                        color: 'red.600',
+                        color: player.isLocalPlayer ? 'red.600' : 'blue.600',
                        fontWeight: 'black',
                        fontSize: isCurrentPlayer ? { base: 'sm', md: 'lg' } : 'inherit',
-                        animation: 'none',
-                        textShadow: '0 0 15px currentColor',
+                        animation: player.isLocalPlayer
+                          ? 'none'
+                          : 'gentle-pulse 2s ease-in-out infinite',
+                        textShadow: player.isLocalPlayer ? '0 0 15px currentColor' : 'none',
                      })}
                    >
-                      {' • Your turn'}
+                      {player.isLocalPlayer ? ' • Your turn' : ' • Their turn'}
                    </span>
                  )}
                  {player.consecutiveMatches > 1 && (
--- a/apps/web/src/app/arcade/matching/components/ResultsPhase.tsx
+++ b/apps/web/src/app/arcade/matching/components/ResultsPhase.tsx
@@ -3,12 +3,12 @@
 import { useRouter } from 'next/navigation'
 import { css } from '../../../../../styled-system/css'
 import { useGameMode } from '../../../../contexts/GameModeContext'
-import { useArcadeMemoryPairs } from '../context/ArcadeMemoryPairsContext'
+import { useMemoryPairs } from '../context/MemoryPairsContext'
 import { formatGameTime, getMultiplayerWinner, getPerformanceAnalysis } from '../utils/gameScoring'

 export function ResultsPhase() {
  const router = useRouter()
-  const { state, resetGame, activePlayers, gameMode } = useArcadeMemoryPairs()
+  const { state, resetGame, activePlayers, gameMode, exitSession } = useMemoryPairs()
  const { players: playerMap, activePlayers: activePlayerIds } = useGameMode()

  // Get active player data array
--- a/apps/web/src/app/arcade/matching/components/SetupPhase.tsx
+++ b/apps/web/src/app/arcade/matching/components/SetupPhase.tsx
@@ -1,8 +1,9 @@
 'use client'

+import { useState } from 'react'
 import { css } from '../../../../../styled-system/css'
 import { useGameMode } from '../../../../contexts/GameModeContext'
-import { useArcadeMemoryPairs } from '../context/ArcadeMemoryPairsContext'
+import { useMemoryPairs } from '../context/MemoryPairsContext'

 // Add bounce animation for the start button
 const bounceAnimation = `
@@ -32,14 +33,87 @@ export function SetupPhase() {
    state,
    setGameType,
    setDifficulty,
+    setTurnTimer,
    startGame,
+    resumeGame,
+    canResumeGame,
+    hasConfigChanged,
    activePlayers: _activePlayers,
-  } = useArcadeMemoryPairs()
+  } = useMemoryPairs()

  const { activePlayerCount, gameMode: _globalGameMode } = useGameMode()

-  const handleStartGame = () => {
-    startGame()
+  // PAUSE/RESUME: Warning dialog state
+  const [showConfigWarning, setShowConfigWarning] = useState(false)
+  const [hasSeenWarning, setHasSeenWarning] = useState(false)
+  const [pendingConfigChange, setPendingConfigChange] = useState<{
+    type: 'gameType' | 'difficulty' | 'turnTimer'
+    value: any
+  } | null>(null)
+
+  // Check if we should show warning when changing config
+  const shouldShowWarning = state.pausedGamePhase && !hasSeenWarning && !hasConfigChanged
+
+  // Config change handlers that check for paused game
+  const handleSetGameType = (value: typeof state.gameType) => {
+    if (shouldShowWarning) {
+      setPendingConfigChange({ type: 'gameType', value })
+      setShowConfigWarning(true)
+    } else {
+      setGameType(value)
+    }
+  }
+
+  const handleSetDifficulty = (value: typeof state.difficulty) => {
+    if (shouldShowWarning) {
+      setPendingConfigChange({ type: 'difficulty', value })
+      setShowConfigWarning(true)
+    } else {
+      setDifficulty(value)
+    }
+  }
+
+  const handleSetTurnTimer = (value: typeof state.turnTimer) => {
+    if (shouldShowWarning) {
+      setPendingConfigChange({ type: 'turnTimer', value })
+      setShowConfigWarning(true)
+    } else {
+      setTurnTimer(value)
+    }
+  }
+
+  // Apply pending config change after warning
+  const applyPendingChange = () => {
+    if (pendingConfigChange) {
+      switch (pendingConfigChange.type) {
+        case 'gameType':
+          setGameType(pendingConfigChange.value)
+          break
+        case 'difficulty':
+          setDifficulty(pendingConfigChange.value)
+          break
+        case 'turnTimer':
+          setTurnTimer(pendingConfigChange.value)
+          break
+      }
+      setHasSeenWarning(true)
+      setPendingConfigChange(null)
+      setShowConfigWarning(false)
+    }
+  }
+
+  // Cancel config change
+  const cancelConfigChange = () => {
+    setPendingConfigChange(null)
+    setShowConfigWarning(false)
+  }
+
+  const handleStartOrResumeGame = () => {
+    if (canResumeGame) {
+      resumeGame()
+    } else {
+      startGame()
+    }
  }

  const getButtonStyles = (
@@ -150,6 +224,94 @@ export function SetupPhase() {
          minHeight: 0, // Allow shrinking
        })}
      >
+        {/* PAUSE/RESUME: Config change warning */}
+        {showConfigWarning && (
+          <div
+            className={css({
+              p: '4',
+              background:
+                'linear-gradient(135deg, rgba(251, 191, 36, 0.15), rgba(245, 158, 11, 0.15))',
+              border: '2px solid',
+              borderColor: 'yellow.400',
+              rounded: 'xl',
+              textAlign: 'center',
+              boxShadow: '0 4px 12px rgba(251, 191, 36, 0.2)',
+            })}
+          >
+            <p
+              className={css({
+                color: 'yellow.700',
+                fontSize: { base: '15px', md: '17px' },
+                fontWeight: 'bold',
+                marginBottom: '8px',
+              })}
+            >
+              ⚠️ Warning: Changing Settings Will End Current Game
+            </p>
+            <p
+              className={css({
+                color: 'gray.600',
+                fontSize: { base: '13px', md: '14px' },
+                marginBottom: '12px',
+              })}
+            >
+              You have a paused game in progress. Changing any setting will end it and you won't be
+              able to resume.
+            </p>
+            <div
+              className={css({
+                display: 'flex',
+                gap: '8px',
+                justifyContent: 'center',
+                flexWrap: 'wrap',
+              })}
+            >
+              <button
+                className={css({
+                  background: 'linear-gradient(135deg, #10b981, #059669)',
+                  color: 'white',
+                  border: 'none',
+                  borderRadius: '8px',
+                  padding: '8px 16px',
+                  fontSize: '14px',
+                  fontWeight: 'bold',
+                  cursor: 'pointer',
+                  transition: 'all 0.2s',
+                  boxShadow: '0 2px 8px rgba(16, 185, 129, 0.3)',
+                  _hover: {
+                    transform: 'translateY(-2px)',
+                    boxShadow: '0 4px 12px rgba(16, 185, 129, 0.4)',
+                  },
+                })}
+                onClick={cancelConfigChange}
+              >
+                ✓ Keep Game & Cancel Change
+              </button>
+              <button
+                className={css({
+                  background: 'linear-gradient(135deg, #ef4444, #dc2626)',
+                  color: 'white',
+                  border: 'none',
+                  borderRadius: '8px',
+                  padding: '8px 16px',
+                  fontSize: '14px',
+                  fontWeight: 'bold',
+                  cursor: 'pointer',
+                  transition: 'all 0.2s',
+                  boxShadow: '0 2px 8px rgba(239, 68, 68, 0.3)',
+                  _hover: {
+                    transform: 'translateY(-2px)',
+                    boxShadow: '0 4px 12px rgba(239, 68, 68, 0.4)',
+                  },
+                })}
+                onClick={applyPendingChange}
+              >
+                ✗ End Game & Apply Change
+              </button>
+            </div>
+          </div>
+        )}
+
        {/* Warning if no players */}
        {activePlayerCount === 0 && (
          <div
@@ -200,7 +362,7 @@ export function SetupPhase() {
          >
            <button
              className={getButtonStyles(state.gameType === 'abacus-numeral', 'secondary')}
-              onClick={() => setGameType('abacus-numeral')}
+              onClick={() => handleSetGameType('abacus-numeral')}
            >
              <div
                className={css({
@@ -246,7 +408,7 @@ export function SetupPhase() {
            </button>
            <button
              className={getButtonStyles(state.gameType === 'complement-pairs', 'secondary')}
-              onClick={() => setGameType('complement-pairs')}
+              onClick={() => handleSetGameType('complement-pairs')}
            >
              <div
                className={css({
@@ -342,7 +504,7 @@ export function SetupPhase() {
                <button
                  key={difficulty}
                  className={getButtonStyles(state.difficulty === difficulty, 'difficulty')}
-                  onClick={() => setDifficulty(difficulty)}
+                  onClick={() => handleSetDifficulty(difficulty)}
                >
                  <div
                    className={css({
@@ -414,7 +576,7 @@ export function SetupPhase() {
                  <button
                    key={timer}
                    className={getButtonStyles(state.turnTimer === timer, 'secondary')}
-                    onClick={() => dispatch({ type: 'SET_TURN_TIMER', timer })}
+                    onClick={() => handleSetTurnTimer(timer)}
                  >
                    <div
                      className={css({
@@ -464,7 +626,9 @@ export function SetupPhase() {
        >
          <button
            className={css({
-              background: 'linear-gradient(135deg, #ff6b6b 0%, #ee5a24 50%, #ff9ff3 100%)',
+              background: canResumeGame
+                ? 'linear-gradient(135deg, #10b981 0%, #059669 50%, #34d399 100%)'
+                : 'linear-gradient(135deg, #ff6b6b 0%, #ee5a24 50%, #ff9ff3 100%)',
              color: 'white',
              border: 'none',
              borderRadius: { base: '16px', sm: '20px', md: '24px' },
@@ -473,7 +637,9 @@ export function SetupPhase() {
              fontWeight: 'black',
              cursor: 'pointer',
              transition: 'all 0.4s cubic-bezier(0.4, 0, 0.2, 1)',
-              boxShadow: '0 8px 20px rgba(255, 107, 107, 0.4), inset 0 2px 0 rgba(255,255,255,0.3)',
+              boxShadow: canResumeGame
+                ? '0 8px 20px rgba(16, 185, 129, 0.4), inset 0 2px 0 rgba(255,255,255,0.3)'
+                : '0 8px 20px rgba(255, 107, 107, 0.4), inset 0 2px 0 rgba(255,255,255,0.3)',
              textShadow: '0 2px 4px rgba(0,0,0,0.3)',
              position: 'relative',
              overflow: 'hidden',
@@ -491,9 +657,12 @@ export function SetupPhase() {
              },
              _hover: {
                transform: { base: 'translateY(-2px)', md: 'translateY(-3px) scale(1.02)' },
-                boxShadow:
-                  '0 12px 30px rgba(255, 107, 107, 0.6), inset 0 2px 0 rgba(255,255,255,0.3)',
-                background: 'linear-gradient(135deg, #ff5252 0%, #dd2c00 50%, #e91e63 100%)',
+                boxShadow: canResumeGame
+                  ? '0 12px 30px rgba(16, 185, 129, 0.6), inset 0 2px 0 rgba(255,255,255,0.3)'
+                  : '0 12px 30px rgba(255, 107, 107, 0.6), inset 0 2px 0 rgba(255,255,255,0.3)',
+                background: canResumeGame
+                  ? 'linear-gradient(135deg, #059669 0%, #047857 50%, #10b981 100%)'
+                  : 'linear-gradient(135deg, #ff5252 0%, #dd2c00 50%, #e91e63 100%)',
                _before: {
                  left: '100%',
                },
@@ -502,7 +671,7 @@ export function SetupPhase() {
                transform: 'translateY(-1px) scale(1.01)',
              },
            })}
-            onClick={handleStartGame}
+            onClick={handleStartOrResumeGame}
          >
            <div
              className={css({
@@ -518,9 +687,9 @@ export function SetupPhase() {
                  animation: 'bounce 2s infinite',
                })}
              >
-                🚀
+                {canResumeGame ? '▶️' : '🚀'}
              </span>
-              <span>START GAME</span>
+              <span>{canResumeGame ? 'RESUME GAME' : 'START GAME'}</span>
              <span
                className={css({
                  fontSize: { base: '18px', sm: '20px', md: '24px' },
@@ -528,7 +697,7 @@ export function SetupPhase() {
                  animationDelay: '0.5s',
                })}
              >
-                🎮
+                {canResumeGame ? '🎮' : '🎮'}
              </span>
            </div>
          </button>
--- a/apps/web/src/app/arcade/matching/context/ArcadeMemoryPairsContext.tsx
+++ b/apps/web/src/app/arcade/matching/context/ArcadeMemoryPairsContext.tsx
@@ -2,6 +2,7 @@

 import { createContext, type ReactNode, useCallback, useContext, useEffect, useMemo } from 'react'
 import { useArcadeSession } from '@/hooks/useArcadeSession'
+import { useRoomData } from '@/hooks/useRoomData'
 import { useViewerId } from '@/hooks/useViewerId'
 import type { GameMove } from '@/lib/arcade/validation'
 import { useGameMode } from '../../../../contexts/GameModeContext'
@@ -104,6 +105,7 @@ const ArcadeMemoryPairsContext = createContext<MemoryPairsContextValue | null>(n
 // Provider component
 export function ArcadeMemoryPairsProvider({ children }: { children: ReactNode }) {
  const { data: viewerId } = useViewerId()
+  const { roomData } = useRoomData()
  const { activePlayerCount, activePlayers: activePlayerIds } = useGameMode()

  // Get active player IDs directly as strings (UUIDs)
@@ -112,7 +114,7 @@ export function ArcadeMemoryPairsProvider({ children }: { children: ReactNode })
  // Derive game mode from active player count
  const gameMode = activePlayerCount > 1 ? 'multiplayer' : 'single'

-  // Arcade session integration
+  // Arcade session integration with room-wide sync
  const {
    state,
    sendMove,
@@ -120,6 +122,7 @@ export function ArcadeMemoryPairsProvider({ children }: { children: ReactNode })
    exitSession,
  } = useArcadeSession<MemoryPairsState>({
    userId: viewerId || '',
+    roomId: roomData?.id, // Enable multi-user sync for room-based games
    initialState,
    applyMove: applyMoveOptimistically,
  })
@@ -143,22 +146,77 @@ export function ArcadeMemoryPairsProvider({ children }: { children: ReactNode })
  // Computed values
  const isGameActive = state.gamePhase === 'playing'

+  const { players } = useGameMode()
+
  const canFlipCard = useCallback(
    (cardId: string): boolean => {
-      if (!isGameActive || state.isProcessingMove) return false
+      console.log('[canFlipCard] Checking card:', {
+        cardId,
+        isGameActive,
+        isProcessingMove: state.isProcessingMove,
+        currentPlayer: state.currentPlayer,
+        hasRoomData: !!roomData,
+        flippedCardsCount: state.flippedCards.length,
+      })
+
+      if (!isGameActive || state.isProcessingMove) {
+        console.log('[canFlipCard] Blocked: game not active or processing')
+        return false
+      }

      const card = state.gameCards.find((c) => c.id === cardId)
-      if (!card || card.matched) return false
+      if (!card || card.matched) {
+        console.log('[canFlipCard] Blocked: card not found or already matched')
+        return false
+      }

      // Can't flip if already flipped
-      if (state.flippedCards.some((c) => c.id === cardId)) return false
+      if (state.flippedCards.some((c) => c.id === cardId)) {
+        console.log('[canFlipCard] Blocked: card already flipped')
+        return false
+      }

      // Can't flip more than 2 cards
-      if (state.flippedCards.length >= 2) return false
+      if (state.flippedCards.length >= 2) {
+        console.log('[canFlipCard] Blocked: 2 cards already flipped')
+        return false
+      }

+      // Authorization check: Only allow flipping if it's your player's turn
+      if (roomData && state.currentPlayer) {
+        const currentPlayerData = players.get(state.currentPlayer)
+        console.log('[canFlipCard] Authorization check:', {
+          currentPlayerId: state.currentPlayer,
+          currentPlayerFound: !!currentPlayerData,
+          currentPlayerIsLocal: currentPlayerData?.isLocal,
+        })
+
+        // Block if current player is explicitly marked as remote (isLocal === false)
+        if (currentPlayerData && currentPlayerData.isLocal === false) {
+          console.log('[canFlipCard] BLOCKED: Current player is remote (not your turn)')
+          return false
+        }
+
+        // If player data not found in map, this might be an issue - allow for now but warn
+        if (!currentPlayerData) {
+          console.warn(
+            '[canFlipCard] WARNING: Current player not found in players map, allowing move'
+          )
+        }
+      }
+
+      console.log('[canFlipCard] ALLOWED: All checks passed')
      return true
    },
-    [isGameActive, state.isProcessingMove, state.gameCards, state.flippedCards]
+    [
+      isGameActive,
+      state.isProcessingMove,
+      state.gameCards,
+      state.flippedCards,
+      state.currentPlayer,
+      roomData,
+      players,
+    ]
  )

  const currentGameStatistics: GameStatistics = useMemo(
@@ -195,7 +253,7 @@ export function ArcadeMemoryPairsProvider({ children }: { children: ReactNode })
        activePlayers,
      },
    })
-  }, [state.gameType, state.difficulty, activePlayers, sendMove])
+  }, [state.gameType, state.difficulty, activePlayers, sendMove, roomData])

  const flipCard = useCallback(
    (cardId: string) => {
--- a/apps/web/src/app/arcade/matching/context/LocalMemoryPairsProvider.tsx
+++ b/apps/web/src/app/arcade/matching/context/LocalMemoryPairsProvider.tsx
@@ -0,0 +1,560 @@
+'use client'
+
+import { type ReactNode, useCallback, useEffect, useMemo, useReducer } from 'react'
+import { useRouter } from 'next/navigation'
+import { useArcadeRedirect } from '@/hooks/useArcadeRedirect'
+import { useViewerId } from '@/hooks/useViewerId'
+import { useUserPlayers } from '@/hooks/useUserPlayers'
+import { generateGameCards } from '../utils/cardGeneration'
+import { validateMatch } from '../utils/matchValidation'
+import { MemoryPairsContext } from './MemoryPairsContext'
+import type { GameMode, GameStatistics, MemoryPairsContextValue, MemoryPairsState } from './types'
+
+// Initial state for local-only games
+const initialState: MemoryPairsState = {
+  cards: [],
+  gameCards: [],
+  flippedCards: [],
+  gameType: 'abacus-numeral',
+  difficulty: 6,
+  turnTimer: 30,
+  gamePhase: 'setup',
+  currentPlayer: '',
+  matchedPairs: 0,
+  totalPairs: 6,
+  moves: 0,
+  scores: {},
+  activePlayers: [],
+  playerMetadata: {},
+  consecutiveMatches: {},
+  gameStartTime: null,
+  gameEndTime: null,
+  currentMoveStartTime: null,
+  timerInterval: null,
+  celebrationAnimations: [],
+  isProcessingMove: false,
+  showMismatchFeedback: false,
+  lastMatchedPair: null,
+  originalConfig: undefined,
+  pausedGamePhase: undefined,
+  pausedGameState: undefined,
+  playerHovers: {},
+}
+
+// Action types for local reducer
+type LocalAction =
+  | { type: 'START_GAME'; cards: any[]; activePlayers: string[]; playerMetadata: any }
+  | { type: 'FLIP_CARD'; cardId: string }
+  | { type: 'MATCH_FOUND'; cardIds: [string, string]; playerId: string }
+  | { type: 'MATCH_FAILED'; cardIds: [string, string] }
+  | { type: 'CLEAR_MISMATCH' }
+  | { type: 'SWITCH_PLAYER' }
+  | { type: 'GO_TO_SETUP' }
+  | { type: 'SET_CONFIG'; field: string; value: any }
+  | { type: 'RESUME_GAME' }
+  | { type: 'HOVER_CARD'; playerId: string; cardId: string | null }
+  | { type: 'END_GAME' }
+
+// Pure client-side reducer with complete game logic
+function localMemoryPairsReducer(state: MemoryPairsState, action: LocalAction): MemoryPairsState {
+  switch (action.type) {
+    case 'START_GAME':
+      return {
+        ...state,
+        gamePhase: 'playing',
+        gameCards: action.cards,
+        cards: action.cards,
+        flippedCards: [],
+        matchedPairs: 0,
+        moves: 0,
+        scores: action.activePlayers.reduce((acc: any, p: string) => ({ ...acc, [p]: 0 }), {}),
+        consecutiveMatches: action.activePlayers.reduce((acc: any, p: string) => ({ ...acc, [p]: 0 }), {}),
+        activePlayers: action.activePlayers,
+        playerMetadata: action.playerMetadata,
+        currentPlayer: action.activePlayers[0] || '',
+        gameStartTime: Date.now(),
+        gameEndTime: null,
+        currentMoveStartTime: Date.now(),
+        celebrationAnimations: [],
+        isProcessingMove: false,
+        showMismatchFeedback: false,
+        lastMatchedPair: null,
+        originalConfig: {
+          gameType: state.gameType,
+          difficulty: state.difficulty,
+          turnTimer: state.turnTimer,
+        },
+        pausedGamePhase: undefined,
+        pausedGameState: undefined,
+      }
+
+    case 'FLIP_CARD': {
+      const card = state.gameCards.find((c) => c.id === action.cardId)
+      if (!card) return state
+
+      const newFlippedCards = [...state.flippedCards, card]
+
+      return {
+        ...state,
+        flippedCards: newFlippedCards,
+        currentMoveStartTime: state.flippedCards.length === 0 ? Date.now() : state.currentMoveStartTime,
+        isProcessingMove: newFlippedCards.length === 2,
+        showMismatchFeedback: false,
+      }
+    }
+
+    case 'MATCH_FOUND': {
+      const [id1, id2] = action.cardIds
+      const updatedCards = state.gameCards.map((card) =>
+        card.id === id1 || card.id === id2
+          ? { ...card, matched: true, matchedBy: action.playerId }
+          : card
+      )
+
+      const newMatchedPairs = state.matchedPairs + 1
+      const newScores = {
+        ...state.scores,
+        [action.playerId]: (state.scores[action.playerId] || 0) + 1,
+      }
+      const newConsecutiveMatches = {
+        ...state.consecutiveMatches,
+        [action.playerId]: (state.consecutiveMatches[action.playerId] || 0) + 1,
+      }
+
+      // Check if game is complete
+      const gameComplete = newMatchedPairs >= state.totalPairs
+
+      return {
+        ...state,
+        gameCards: updatedCards,
+        cards: updatedCards,
+        flippedCards: [],
+        matchedPairs: newMatchedPairs,
+        moves: state.moves + 1,
+        scores: newScores,
+        consecutiveMatches: newConsecutiveMatches,
+        lastMatchedPair: action.cardIds,
+        isProcessingMove: false,
+        showMismatchFeedback: false,
+        gamePhase: gameComplete ? 'results' : state.gamePhase,
+        gameEndTime: gameComplete ? Date.now() : null,
+        // Player keeps their turn on match
+      }
+    }
+
+    case 'MATCH_FAILED': {
+      // Reset consecutive matches for current player
+      const newConsecutiveMatches = {
+        ...state.consecutiveMatches,
+        [state.currentPlayer]: 0,
+      }
+
+      return {
+        ...state,
+        moves: state.moves + 1,
+        showMismatchFeedback: true,
+        isProcessingMove: true,
+        consecutiveMatches: newConsecutiveMatches,
+        // Don't clear flipped cards yet - CLEAR_MISMATCH will do that
+      }
+    }
+
+    case 'CLEAR_MISMATCH': {
+      return {
+        ...state,
+        flippedCards: [],
+        showMismatchFeedback: false,
+        isProcessingMove: false,
+      }
+    }
+
+    case 'SWITCH_PLAYER': {
+      const currentIndex = state.activePlayers.indexOf(state.currentPlayer)
+      const nextIndex = (currentIndex + 1) % state.activePlayers.length
+      const nextPlayer = state.activePlayers[nextIndex]
+
+      return {
+        ...state,
+        currentPlayer: nextPlayer,
+        currentMoveStartTime: Date.now(),
+      }
+    }
+
+    case 'GO_TO_SETUP': {
+      const isPausingGame = state.gamePhase === 'playing' || state.gamePhase === 'results'
+
+      return {
+        ...state,
+        gamePhase: 'setup',
+        pausedGamePhase: isPausingGame ? state.gamePhase : undefined,
+        pausedGameState: isPausingGame
+          ? {
+              gameCards: state.gameCards,
+              currentPlayer: state.currentPlayer,
+              matchedPairs: state.matchedPairs,
+              moves: state.moves,
+              scores: state.scores,
+              activePlayers: state.activePlayers,
+              playerMetadata: state.playerMetadata || {},
+              consecutiveMatches: state.consecutiveMatches,
+              gameStartTime: state.gameStartTime,
+            }
+          : undefined,
+        gameCards: [],
+        cards: [],
+        flippedCards: [],
+        currentPlayer: '',
+        matchedPairs: 0,
+        moves: 0,
+        scores: {},
+        activePlayers: [],
+        playerMetadata: {},
+        consecutiveMatches: {},
+        gameStartTime: null,
+        gameEndTime: null,
+        currentMoveStartTime: null,
+        celebrationAnimations: [],
+        isProcessingMove: false,
+        showMismatchFeedback: false,
+        lastMatchedPair: null,
+      }
+    }
+
+    case 'SET_CONFIG': {
+      const clearPausedGame = !!state.pausedGamePhase
+
+      return {
+        ...state,
+        [action.field]: action.value,
+        ...(action.field === 'difficulty' ? { totalPairs: action.value } : {}),
+        ...(clearPausedGame
+          ? { pausedGamePhase: undefined, pausedGameState: undefined, originalConfig: undefined }
+          : {}),
+      }
+    }
+
+    case 'RESUME_GAME': {
+      if (!state.pausedGamePhase || !state.pausedGameState) {
+        return state
+      }
+
+      return {
+        ...state,
+        gamePhase: state.pausedGamePhase,
+        gameCards: state.pausedGameState.gameCards,
+        cards: state.pausedGameState.gameCards,
+        currentPlayer: state.pausedGameState.currentPlayer,
+        matchedPairs: state.pausedGameState.matchedPairs,
+        moves: state.pausedGameState.moves,
+        scores: state.pausedGameState.scores,
+        activePlayers: state.pausedGameState.activePlayers,
+        playerMetadata: state.pausedGameState.playerMetadata,
+        consecutiveMatches: state.pausedGameState.consecutiveMatches,
+        gameStartTime: state.pausedGameState.gameStartTime,
+        pausedGamePhase: undefined,
+        pausedGameState: undefined,
+      }
+    }
+
+    case 'HOVER_CARD': {
+      return {
+        ...state,
+        playerHovers: {
+          ...state.playerHovers,
+          [action.playerId]: action.cardId,
+        },
+      }
+    }
+
+    case 'END_GAME': {
+      return {
+        ...state,
+        gamePhase: 'results',
+        gameEndTime: Date.now(),
+      }
+    }
+
+    default:
+      return state
+  }
+}
+
+// Provider component for LOCAL-ONLY play (no network, no arcade session)
+export function LocalMemoryPairsProvider({ children }: { children: ReactNode }) {
+  const router = useRouter()
+  const { data: viewerId } = useViewerId()
+
+  // LOCAL-ONLY: Get only the current user's players (no room members)
+  const { data: userPlayers = [] } = useUserPlayers()
+
+  // Use arcade redirect to determine button visibility
+  const { canModifyPlayers } = useArcadeRedirect({ currentGame: 'matching' })
+
+  // Build players map from current user's players only
+  const players = useMemo(() => {
+    const map = new Map()
+    userPlayers.forEach((player) => {
+      map.set(player.id, {
+        id: player.id,
+        name: player.name,
+        emoji: player.emoji,
+        color: player.color,
+        isLocal: true,
+      })
+    })
+    return map
+  }, [userPlayers])
+
+  // Get active player IDs from current user's players only
+  const activePlayers = useMemo(() => {
+    return userPlayers.filter((p) => p.isActive).map((p) => p.id)
+  }, [userPlayers])
+
+  // Derive game mode from active player count
+  const gameMode = activePlayers.length > 1 ? 'multiplayer' : 'single'
+
+  // Pure client-side state with useReducer
+  const [state, dispatch] = useReducer(localMemoryPairsReducer, initialState)
+
+  // Handle mismatch feedback timeout and player switching
+  useEffect(() => {
+    if (state.showMismatchFeedback && state.flippedCards.length === 2) {
+      const timeout = setTimeout(() => {
+        dispatch({ type: 'CLEAR_MISMATCH' })
+        // Switch to next player after mismatch
+        dispatch({ type: 'SWITCH_PLAYER' })
+      }, 1500)
+
+      return () => clearTimeout(timeout)
+    }
+  }, [state.showMismatchFeedback, state.flippedCards.length])
+
+  // Handle automatic match checking when 2 cards flipped
+  useEffect(() => {
+    if (state.flippedCards.length === 2 && !state.showMismatchFeedback) {
+      const [card1, card2] = state.flippedCards
+      const isMatch = validateMatch(card1, card2)
+
+      const timeout = setTimeout(() => {
+        if (isMatch.isValid) {
+          dispatch({
+            type: 'MATCH_FOUND',
+            cardIds: [card1.id, card2.id],
+            playerId: state.currentPlayer,
+          })
+          // Player keeps turn on match - no SWITCH_PLAYER
+        } else {
+          dispatch({
+            type: 'MATCH_FAILED',
+            cardIds: [card1.id, card2.id],
+          })
+          // SWITCH_PLAYER will happen after CLEAR_MISMATCH timeout
+        }
+      }, 600) // Small delay to show both cards
+
+      return () => clearTimeout(timeout)
+    }
+  }, [state.flippedCards, state.showMismatchFeedback, state.currentPlayer])
+
+  // Computed values
+  const isGameActive = state.gamePhase === 'playing'
+
+  const canFlipCard = useCallback(
+    (cardId: string): boolean => {
+      if (!isGameActive || state.isProcessingMove) {
+        return false
+      }
+
+      const card = state.gameCards.find((c) => c.id === cardId)
+      if (!card || card.matched) {
+        return false
+      }
+
+      if (state.flippedCards.some((c) => c.id === cardId)) {
+        return false
+      }
+
+      if (state.flippedCards.length >= 2) {
+        return false
+      }
+
+      // In local play, all local players can flip during their turn
+      const currentPlayerData = players.get(state.currentPlayer)
+      if (currentPlayerData && currentPlayerData.isLocal === false) {
+        return false
+      }
+
+      return true
+    },
+    [isGameActive, state.isProcessingMove, state.gameCards, state.flippedCards, state.currentPlayer, players]
+  )
+
+  const currentGameStatistics: GameStatistics = useMemo(
+    () => ({
+      totalMoves: state.moves,
+      matchedPairs: state.matchedPairs,
+      totalPairs: state.totalPairs,
+      gameTime: state.gameStartTime ? (state.gameEndTime || Date.now()) - state.gameStartTime : 0,
+      accuracy: state.moves > 0 ? (state.matchedPairs / state.moves) * 100 : 0,
+      averageTimePerMove:
+        state.moves > 0 && state.gameStartTime
+          ? ((state.gameEndTime || Date.now()) - state.gameStartTime) / state.moves
+          : 0,
+    }),
+    [state.moves, state.matchedPairs, state.totalPairs, state.gameStartTime, state.gameEndTime]
+  )
+
+  const hasConfigChanged = useMemo(() => {
+    if (!state.originalConfig) return false
+    return (
+      state.gameType !== state.originalConfig.gameType ||
+      state.difficulty !== state.originalConfig.difficulty ||
+      state.turnTimer !== state.originalConfig.turnTimer
+    )
+  }, [state.gameType, state.difficulty, state.turnTimer, state.originalConfig])
+
+  const canResumeGame = useMemo(() => {
+    return !!state.pausedGamePhase && !!state.pausedGameState && !hasConfigChanged
+  }, [state.pausedGamePhase, state.pausedGameState, hasConfigChanged])
+
+  // Action creators
+  const startGame = useCallback(() => {
+    if (activePlayers.length === 0) {
+      console.error('[LocalMemoryPairs] Cannot start game without active players')
+      return
+    }
+
+    const playerMetadata: { [playerId: string]: any } = {}
+    for (const playerId of activePlayers) {
+      const playerData = players.get(playerId)
+      if (playerData) {
+        playerMetadata[playerId] = {
+          id: playerId,
+          name: playerData.name,
+          emoji: playerData.emoji,
+          userId: viewerId || '',
+          color: playerData.color,
+        }
+      }
+    }
+
+    const cards = generateGameCards(state.gameType, state.difficulty)
+    dispatch({
+      type: 'START_GAME',
+      cards,
+      activePlayers,
+      playerMetadata,
+    })
+  }, [state.gameType, state.difficulty, activePlayers, players, viewerId])
+
+  const flipCard = useCallback(
+    (cardId: string) => {
+      if (!canFlipCard(cardId)) {
+        return
+      }
+      dispatch({ type: 'FLIP_CARD', cardId })
+    },
+    [canFlipCard]
+  )
+
+  const resetGame = useCallback(() => {
+    if (activePlayers.length === 0) {
+      console.error('[LocalMemoryPairs] Cannot reset game without active players')
+      return
+    }
+
+    const playerMetadata: { [playerId: string]: any } = {}
+    for (const playerId of activePlayers) {
+      const playerData = players.get(playerId)
+      if (playerData) {
+        playerMetadata[playerId] = {
+          id: playerId,
+          name: playerData.name,
+          emoji: playerData.emoji,
+          userId: viewerId || '',
+          color: playerData.color,
+        }
+      }
+    }
+
+    const cards = generateGameCards(state.gameType, state.difficulty)
+    dispatch({
+      type: 'START_GAME',
+      cards,
+      activePlayers,
+      playerMetadata,
+    })
+  }, [state.gameType, state.difficulty, activePlayers, players, viewerId])
+
+  const setGameType = useCallback((gameType: typeof state.gameType) => {
+    dispatch({ type: 'SET_CONFIG', field: 'gameType', value: gameType })
+  }, [])
+
+  const setDifficulty = useCallback((difficulty: typeof state.difficulty) => {
+    dispatch({ type: 'SET_CONFIG', field: 'difficulty', value: difficulty })
+  }, [])
+
+  const setTurnTimer = useCallback((turnTimer: typeof state.turnTimer) => {
+    dispatch({ type: 'SET_CONFIG', field: 'turnTimer', value: turnTimer })
+  }, [])
+
+  const resumeGame = useCallback(() => {
+    if (!canResumeGame) {
+      console.warn('[LocalMemoryPairs] Cannot resume - no paused game or config changed')
+      return
+    }
+    dispatch({ type: 'RESUME_GAME' })
+  }, [canResumeGame])
+
+  const goToSetup = useCallback(() => {
+    dispatch({ type: 'GO_TO_SETUP' })
+  }, [])
+
+  const hoverCard = useCallback(
+    (cardId: string | null) => {
+      const playerId = state.currentPlayer || activePlayers[0] || ''
+      if (!playerId) return
+
+      dispatch({
+        type: 'HOVER_CARD',
+        playerId,
+        cardId,
+      })
+    },
+    [state.currentPlayer, activePlayers]
+  )
+
+  const exitSession = useCallback(() => {
+    router.push('/arcade')
+  }, [router])
+
+  const effectiveState = { ...state, gameMode } as MemoryPairsState & { gameMode: GameMode }
+
+  const contextValue: MemoryPairsContextValue = {
+    state: effectiveState,
+    dispatch: () => {
+      // No-op - local provider uses action creators instead
+      console.warn('dispatch() is not available in local mode, use action creators instead')
+    },
+    isGameActive,
+    canFlipCard,
+    currentGameStatistics,
+    hasConfigChanged,
+    canResumeGame,
+    canModifyPlayers,
+    startGame,
+    resumeGame,
+    flipCard,
+    resetGame,
+    goToSetup,
+    setGameType,
+    setDifficulty,
+    setTurnTimer,
+    hoverCard,
+    exitSession,
+    gameMode,
+    activePlayers,
+  }
+
+  return <MemoryPairsContext.Provider value={contextValue}>{children}</MemoryPairsContext.Provider>
+}
--- a/apps/web/src/app/arcade/matching/context/MemoryPairsContext.tsx
+++ b/apps/web/src/app/arcade/matching/context/MemoryPairsContext.tsx
@@ -251,7 +251,7 @@ function memoryPairsReducer(state: MemoryPairsState, action: MemoryPairsAction):
 }

 // Create context
-const MemoryPairsContext = createContext<MemoryPairsContextValue | null>(null)
+export const MemoryPairsContext = createContext<MemoryPairsContextValue | null>(null)

 // Provider component
 export function MemoryPairsProvider({ children }: { children: ReactNode }) {
--- a/apps/web/src/app/arcade/matching/context/RoomMemoryPairsProvider.tsx
+++ b/apps/web/src/app/arcade/matching/context/RoomMemoryPairsProvider.tsx
@@ -0,0 +1,582 @@
+'use client'
+
+import { type ReactNode, useCallback, useEffect, useMemo } from 'react'
+import { useArcadeRedirect } from '@/hooks/useArcadeRedirect'
+import { useArcadeSession } from '@/hooks/useArcadeSession'
+import { useRoomData } from '@/hooks/useRoomData'
+import { useViewerId } from '@/hooks/useViewerId'
+import type { GameMove } from '@/lib/arcade/validation'
+import { useGameMode } from '../../../../contexts/GameModeContext'
+import { generateGameCards } from '../utils/cardGeneration'
+import { MemoryPairsContext } from './MemoryPairsContext'
+import type { GameMode, GameStatistics, MemoryPairsContextValue, MemoryPairsState } from './types'
+
+// Initial state
+const initialState: MemoryPairsState = {
+  cards: [],
+  gameCards: [],
+  flippedCards: [],
+  gameType: 'abacus-numeral',
+  difficulty: 6,
+  turnTimer: 30,
+  gamePhase: 'setup',
+  currentPlayer: '', // Will be set to first player ID on START_GAME
+  matchedPairs: 0,
+  totalPairs: 6,
+  moves: 0,
+  scores: {},
+  activePlayers: [],
+  playerMetadata: {}, // Player metadata for cross-user visibility
+  consecutiveMatches: {},
+  gameStartTime: null,
+  gameEndTime: null,
+  currentMoveStartTime: null,
+  timerInterval: null,
+  celebrationAnimations: [],
+  isProcessingMove: false,
+  showMismatchFeedback: false,
+  lastMatchedPair: null,
+  // PAUSE/RESUME: Initialize paused game fields
+  originalConfig: undefined,
+  pausedGamePhase: undefined,
+  pausedGameState: undefined,
+  // HOVER: Initialize hover state
+  playerHovers: {},
+}
+
+/**
+ * Optimistic move application (client-side prediction)
+ * The server will validate and send back the authoritative state
+ */
+function applyMoveOptimistically(state: MemoryPairsState, move: GameMove): MemoryPairsState {
+  switch (move.type) {
+    case 'START_GAME':
+      // Generate cards and initialize game
+      return {
+        ...state,
+        gamePhase: 'playing',
+        gameCards: move.data.cards,
+        cards: move.data.cards,
+        flippedCards: [],
+        matchedPairs: 0,
+        moves: 0,
+        scores: move.data.activePlayers.reduce((acc: any, p: string) => ({ ...acc, [p]: 0 }), {}),
+        consecutiveMatches: move.data.activePlayers.reduce(
+          (acc: any, p: string) => ({ ...acc, [p]: 0 }),
+          {}
+        ),
+        activePlayers: move.data.activePlayers,
+        playerMetadata: move.data.playerMetadata || {}, // Include player metadata
+        currentPlayer: move.data.activePlayers[0] || '',
+        gameStartTime: Date.now(),
+        gameEndTime: null,
+        currentMoveStartTime: Date.now(),
+        celebrationAnimations: [],
+        isProcessingMove: false,
+        showMismatchFeedback: false,
+        lastMatchedPair: null,
+        // PAUSE/RESUME: Save original config and clear paused state
+        originalConfig: {
+          gameType: state.gameType,
+          difficulty: state.difficulty,
+          turnTimer: state.turnTimer,
+        },
+        pausedGamePhase: undefined,
+        pausedGameState: undefined,
+      }
+
+    case 'FLIP_CARD': {
+      // Optimistically flip the card
+      const card = state.gameCards.find((c) => c.id === move.data.cardId)
+      if (!card) return state
+
+      const newFlippedCards = [...state.flippedCards, card]
+
+      return {
+        ...state,
+        flippedCards: newFlippedCards,
+        currentMoveStartTime:
+          state.flippedCards.length === 0 ? Date.now() : state.currentMoveStartTime,
+        isProcessingMove: newFlippedCards.length === 2, // Processing if 2 cards flipped
+        showMismatchFeedback: false,
+      }
+    }
+
+    case 'CLEAR_MISMATCH': {
+      // Clear mismatched cards and feedback
+      return {
+        ...state,
+        flippedCards: [],
+        showMismatchFeedback: false,
+        isProcessingMove: false,
+      }
+    }
+
+    case 'GO_TO_SETUP': {
+      // Return to setup phase - pause game if coming from playing/results
+      const isPausingGame = state.gamePhase === 'playing' || state.gamePhase === 'results'
+
+      return {
+        ...state,
+        gamePhase: 'setup',
+        // PAUSE: Save game state if pausing from active game
+        pausedGamePhase: isPausingGame ? state.gamePhase : undefined,
+        pausedGameState: isPausingGame
+          ? {
+              gameCards: state.gameCards,
+              currentPlayer: state.currentPlayer,
+              matchedPairs: state.matchedPairs,
+              moves: state.moves,
+              scores: state.scores,
+              activePlayers: state.activePlayers,
+              playerMetadata: state.playerMetadata,
+              consecutiveMatches: state.consecutiveMatches,
+              gameStartTime: state.gameStartTime,
+            }
+          : undefined,
+        // Reset visible game state
+        gameCards: [],
+        cards: [],
+        flippedCards: [],
+        currentPlayer: '',
+        matchedPairs: 0,
+        moves: 0,
+        scores: {},
+        activePlayers: [],
+        playerMetadata: {},
+        consecutiveMatches: {},
+        gameStartTime: null,
+        gameEndTime: null,
+        currentMoveStartTime: null,
+        celebrationAnimations: [],
+        isProcessingMove: false,
+        showMismatchFeedback: false,
+        lastMatchedPair: null,
+      }
+    }
+
+    case 'SET_CONFIG': {
+      // Update configuration field optimistically
+      const { field, value } = move.data as { field: string; value: any }
+      const clearPausedGame = !!state.pausedGamePhase
+
+      return {
+        ...state,
+        [field]: value,
+        // Update totalPairs if difficulty changes
+        ...(field === 'difficulty' ? { totalPairs: value } : {}),
+        // Clear paused game if config changed
+        ...(clearPausedGame
+          ? { pausedGamePhase: undefined, pausedGameState: undefined, originalConfig: undefined }
+          : {}),
+      }
+    }
+
+    case 'RESUME_GAME': {
+      // Resume paused game
+      if (!state.pausedGamePhase || !state.pausedGameState) {
+        return state // No paused game, no-op
+      }
+
+      return {
+        ...state,
+        gamePhase: state.pausedGamePhase,
+        gameCards: state.pausedGameState.gameCards,
+        cards: state.pausedGameState.gameCards,
+        currentPlayer: state.pausedGameState.currentPlayer,
+        matchedPairs: state.pausedGameState.matchedPairs,
+        moves: state.pausedGameState.moves,
+        scores: state.pausedGameState.scores,
+        activePlayers: state.pausedGameState.activePlayers,
+        playerMetadata: state.pausedGameState.playerMetadata,
+        consecutiveMatches: state.pausedGameState.consecutiveMatches,
+        gameStartTime: state.pausedGameState.gameStartTime,
+        // Clear paused state
+        pausedGamePhase: undefined,
+        pausedGameState: undefined,
+      }
+    }
+
+    case 'HOVER_CARD': {
+      // Update player hover state for networked presence
+      return {
+        ...state,
+        playerHovers: {
+          ...state.playerHovers,
+          [move.playerId]: move.data.cardId,
+        },
+      }
+    }
+
+    default:
+      return state
+  }
+}
+
+// Provider component for ROOM-BASED play (with network sync)
+// NOTE: This provider should ONLY be used for room-based multiplayer games.
+// For arcade sessions without rooms, use LocalMemoryPairsProvider instead.
+export function RoomMemoryPairsProvider({ children }: { children: ReactNode }) {
+  const { data: viewerId } = useViewerId()
+  const { roomData } = useRoomData() // Fetch room data for room-based play
+  const { activePlayerCount, activePlayers: activePlayerIds, players } = useGameMode()
+
+  // Get active player IDs directly as strings (UUIDs)
+  const activePlayers = Array.from(activePlayerIds)
+
+  // Derive game mode from active player count
+  const gameMode = activePlayerCount > 1 ? 'multiplayer' : 'single'
+
+  // NO LOCAL STATE - Configuration lives in session state
+  // Changes are sent as moves and synchronized across all room members
+
+  // Arcade session integration WITH room sync
+  const {
+    state,
+    sendMove,
+    connected: _connected,
+    exitSession,
+  } = useArcadeSession<MemoryPairsState>({
+    userId: viewerId || '',
+    roomId: roomData?.id, // CRITICAL: Pass roomId for network sync across room members
+    initialState,
+    applyMove: applyMoveOptimistically,
+  })
+
+  // Handle mismatch feedback timeout
+  useEffect(() => {
+    if (state.showMismatchFeedback && state.flippedCards.length === 2) {
+      // After 1.5 seconds, send CLEAR_MISMATCH
+      // Server will validate that cards are still in mismatch state before clearing
+      const timeout = setTimeout(() => {
+        sendMove({
+          type: 'CLEAR_MISMATCH',
+          playerId: state.currentPlayer,
+          data: {},
+        })
+      }, 1500)
+
+      return () => clearTimeout(timeout)
+    }
+  }, [state.showMismatchFeedback, state.flippedCards.length, sendMove, state.currentPlayer])
+
+  // Computed values
+  const isGameActive = state.gamePhase === 'playing'
+
+  const canFlipCard = useCallback(
+    (cardId: string): boolean => {
+      console.log('[RoomProvider][canFlipCard] Checking card:', {
+        cardId,
+        isGameActive,
+        isProcessingMove: state.isProcessingMove,
+        currentPlayer: state.currentPlayer,
+        hasRoomData: !!roomData,
+        flippedCardsCount: state.flippedCards.length,
+      })
+
+      if (!isGameActive || state.isProcessingMove) {
+        console.log('[RoomProvider][canFlipCard] Blocked: game not active or processing')
+        return false
+      }
+
+      const card = state.gameCards.find((c) => c.id === cardId)
+      if (!card || card.matched) {
+        console.log('[RoomProvider][canFlipCard] Blocked: card not found or already matched')
+        return false
+      }
+
+      // Can't flip if already flipped
+      if (state.flippedCards.some((c) => c.id === cardId)) {
+        console.log('[RoomProvider][canFlipCard] Blocked: card already flipped')
+        return false
+      }
+
+      // Can't flip more than 2 cards
+      if (state.flippedCards.length >= 2) {
+        console.log('[RoomProvider][canFlipCard] Blocked: 2 cards already flipped')
+        return false
+      }
+
+      // Authorization check: Only allow flipping if it's your player's turn
+      if (roomData && state.currentPlayer) {
+        const currentPlayerData = players.get(state.currentPlayer)
+        console.log('[RoomProvider][canFlipCard] Authorization check:', {
+          currentPlayerId: state.currentPlayer,
+          currentPlayerFound: !!currentPlayerData,
+          currentPlayerIsLocal: currentPlayerData?.isLocal,
+        })
+
+        // Block if current player is explicitly marked as remote (isLocal === false)
+        if (currentPlayerData && currentPlayerData.isLocal === false) {
+          console.log(
+            '[RoomProvider][canFlipCard] BLOCKED: Current player is remote (not your turn)'
+          )
+          return false
+        }
+
+        // If player data not found in map, this might be an issue - allow for now but warn
+        if (!currentPlayerData) {
+          console.warn(
+            '[RoomProvider][canFlipCard] WARNING: Current player not found in players map, allowing move'
+          )
+        }
+      }
+
+      console.log('[RoomProvider][canFlipCard] ALLOWED: All checks passed')
+      return true
+    },
+    [
+      isGameActive,
+      state.isProcessingMove,
+      state.gameCards,
+      state.flippedCards,
+      state.currentPlayer,
+      roomData,
+      players,
+    ]
+  )
+
+  const currentGameStatistics: GameStatistics = useMemo(
+    () => ({
+      totalMoves: state.moves,
+      matchedPairs: state.matchedPairs,
+      totalPairs: state.totalPairs,
+      gameTime: state.gameStartTime ? (state.gameEndTime || Date.now()) - state.gameStartTime : 0,
+      accuracy: state.moves > 0 ? (state.matchedPairs / state.moves) * 100 : 0,
+      averageTimePerMove:
+        state.moves > 0 && state.gameStartTime
+          ? ((state.gameEndTime || Date.now()) - state.gameStartTime) / state.moves
+          : 0,
+    }),
+    [state.moves, state.matchedPairs, state.totalPairs, state.gameStartTime, state.gameEndTime]
+  )
+
+  // PAUSE/RESUME: Computed values for pause/resume functionality
+  const hasConfigChanged = useMemo(() => {
+    if (!state.originalConfig) return false
+    return (
+      state.gameType !== state.originalConfig.gameType ||
+      state.difficulty !== state.originalConfig.difficulty ||
+      state.turnTimer !== state.originalConfig.turnTimer
+    )
+  }, [state.gameType, state.difficulty, state.turnTimer, state.originalConfig])
+
+  const canResumeGame = useMemo(() => {
+    return !!state.pausedGamePhase && !!state.pausedGameState && !hasConfigChanged
+  }, [state.pausedGamePhase, state.pausedGameState, hasConfigChanged])
+
+  // Action creators - send moves to arcade session
+  const startGame = useCallback(() => {
+    // Must have at least one active player
+    if (activePlayers.length === 0) {
+      console.error('[RoomMemoryPairs] Cannot start game without active players')
+      return
+    }
+
+    // Capture player metadata from local players map
+    // This ensures all room members can display player info even if they don't own the players
+    const playerMetadata: { [playerId: string]: any } = {}
+    for (const playerId of activePlayers) {
+      const playerData = players.get(playerId)
+      if (playerData) {
+        playerMetadata[playerId] = {
+          id: playerId,
+          name: playerData.name,
+          emoji: playerData.emoji,
+          userId: viewerId || '',
+          color: playerData.color,
+        }
+      }
+    }
+
+    // Use current session state configuration (no local state!)
+    const cards = generateGameCards(state.gameType, state.difficulty)
+    // Use first active player as playerId for START_GAME move
+    const firstPlayer = activePlayers[0]
+    sendMove({
+      type: 'START_GAME',
+      playerId: firstPlayer,
+      data: {
+        cards,
+        activePlayers,
+        playerMetadata,
+      },
+    })
+  }, [state.gameType, state.difficulty, activePlayers, players, viewerId, sendMove])
+
+  const flipCard = useCallback(
+    (cardId: string) => {
+      console.log('[RoomProvider] flipCard called:', {
+        cardId,
+        viewerId,
+        currentPlayer: state.currentPlayer,
+        activePlayers: state.activePlayers,
+        gamePhase: state.gamePhase,
+        canFlip: canFlipCard(cardId),
+      })
+
+      if (!canFlipCard(cardId)) {
+        console.log('[RoomProvider] Cannot flip card - canFlipCard returned false')
+        return
+      }
+
+      const move = {
+        type: 'FLIP_CARD' as const,
+        playerId: state.currentPlayer, // Use the current player ID from game state (database player ID)
+        data: { cardId },
+      }
+      console.log('[RoomProvider] Sending FLIP_CARD move via sendMove:', move)
+      sendMove(move)
+    },
+    [canFlipCard, sendMove, viewerId, state.currentPlayer, state.activePlayers, state.gamePhase]
+  )
+
+  const resetGame = useCallback(() => {
+    // Must have at least one active player
+    if (activePlayers.length === 0) {
+      console.error('[RoomMemoryPairs] Cannot reset game without active players')
+      return
+    }
+
+    // Capture player metadata from local players map
+    const playerMetadata: { [playerId: string]: any } = {}
+    for (const playerId of activePlayers) {
+      const playerData = players.get(playerId)
+      if (playerData) {
+        playerMetadata[playerId] = {
+          id: playerId,
+          name: playerData.name,
+          emoji: playerData.emoji,
+          userId: viewerId || '',
+          color: playerData.color,
+        }
+      }
+    }
+
+    // Use current session state configuration (no local state!)
+    const cards = generateGameCards(state.gameType, state.difficulty)
+    // Use first active player as playerId for START_GAME move
+    const firstPlayer = activePlayers[0]
+    sendMove({
+      type: 'START_GAME',
+      playerId: firstPlayer,
+      data: {
+        cards,
+        activePlayers,
+        playerMetadata,
+      },
+    })
+  }, [state.gameType, state.difficulty, activePlayers, players, viewerId, sendMove])
+
+  const setGameType = useCallback(
+    (gameType: typeof state.gameType) => {
+      // Use first active player as playerId, or empty string if none
+      const playerId = activePlayers[0] || ''
+      sendMove({
+        type: 'SET_CONFIG',
+        playerId,
+        data: { field: 'gameType', value: gameType },
+      })
+    },
+    [activePlayers, sendMove]
+  )
+
+  const setDifficulty = useCallback(
+    (difficulty: typeof state.difficulty) => {
+      const playerId = activePlayers[0] || ''
+      sendMove({
+        type: 'SET_CONFIG',
+        playerId,
+        data: { field: 'difficulty', value: difficulty },
+      })
+    },
+    [activePlayers, sendMove]
+  )
+
+  const setTurnTimer = useCallback(
+    (turnTimer: typeof state.turnTimer) => {
+      const playerId = activePlayers[0] || ''
+      sendMove({
+        type: 'SET_CONFIG',
+        playerId,
+        data: { field: 'turnTimer', value: turnTimer },
+      })
+    },
+    [activePlayers, sendMove]
+  )
+
+  const goToSetup = useCallback(() => {
+    // Send GO_TO_SETUP move - synchronized across all room members
+    const playerId = activePlayers[0] || state.currentPlayer || ''
+    sendMove({
+      type: 'GO_TO_SETUP',
+      playerId,
+      data: {},
+    })
+  }, [activePlayers, state.currentPlayer, sendMove])
+
+  const resumeGame = useCallback(() => {
+    // PAUSE/RESUME: Resume paused game if config unchanged
+    if (!canResumeGame) {
+      console.warn('[RoomMemoryPairs] Cannot resume - no paused game or config changed')
+      return
+    }
+
+    const playerId = activePlayers[0] || state.currentPlayer || ''
+    sendMove({
+      type: 'RESUME_GAME',
+      playerId,
+      data: {},
+    })
+  }, [canResumeGame, activePlayers, state.currentPlayer, sendMove])
+
+  const hoverCard = useCallback(
+    (cardId: string | null) => {
+      // HOVER: Send hover state for networked presence
+      // Use current player as the one hovering
+      const playerId = state.currentPlayer || activePlayers[0] || ''
+      if (!playerId) return // No active player to send hover for
+
+      sendMove({
+        type: 'HOVER_CARD',
+        playerId,
+        data: { cardId },
+      })
+    },
+    [state.currentPlayer, activePlayers, sendMove]
+  )
+
+  // NO MORE effectiveState merging! Just use session state directly with gameMode added
+  const effectiveState = { ...state, gameMode } as MemoryPairsState & { gameMode: GameMode }
+
+  const contextValue: MemoryPairsContextValue = {
+    state: effectiveState,
+    dispatch: () => {
+      // No-op - replaced with sendMove
+      console.warn('dispatch() is deprecated in arcade mode, use action creators instead')
+    },
+    isGameActive,
+    canFlipCard,
+    currentGameStatistics,
+    hasConfigChanged,
+    canResumeGame,
+    canModifyPlayers: false, // Room-based games: always show buttons (false = show buttons)
+    startGame,
+    resumeGame,
+    flipCard,
+    resetGame,
+    goToSetup,
+    setGameType,
+    setDifficulty,
+    setTurnTimer,
+    hoverCard,
+    exitSession,
+    gameMode,
+    activePlayers,
+  }
+
+  return <MemoryPairsContext.Provider value={contextValue}>{children}</MemoryPairsContext.Provider>
+}
+
+// Export the hook for this provider
+export { useMemoryPairs } from './MemoryPairsContext'
--- a/apps/web/src/app/arcade/matching/context/index.ts
+++ b/apps/web/src/app/arcade/matching/context/index.ts
@@ -0,0 +1,20 @@
+/**
+ * Central export point for arcade matching game context
+ * Re-exports the hook from the appropriate provider
+ */
+
+// Export the hook (works with both local and room providers)
+export { useMemoryPairs } from './MemoryPairsContext'
+
+// Export the room provider (networked multiplayer)
+export { RoomMemoryPairsProvider } from './RoomMemoryPairsProvider'
+
+// Export types
+export type {
+  GameCard,
+  GameMode,
+  GamePhase,
+  GameType,
+  MemoryPairsState,
+  MemoryPairsContextValue,
+} from './types'
--- a/apps/web/src/app/arcade/matching/context/types.ts
+++ b/apps/web/src/app/arcade/matching/context/types.ts
@@ -59,6 +59,7 @@ export interface MemoryPairsState {
  moves: number
  scores: PlayerScore
  activePlayers: Player[] // Track active player IDs
+  playerMetadata?: { [playerId: string]: any } // Player metadata for cross-user visibility
  consecutiveMatches: { [playerId: string]: number } // Track consecutive matches per player

  // Timing
@@ -72,6 +73,24 @@ export interface MemoryPairsState {
  isProcessingMove: boolean
  showMismatchFeedback: boolean
  lastMatchedPair: [string, string] | null
+
+  // PAUSE/RESUME: Paused game state
+  originalConfig?: { gameType: GameType; difficulty: Difficulty; turnTimer: number }
+  pausedGamePhase?: GamePhase
+  pausedGameState?: {
+    gameCards: GameCard[]
+    currentPlayer: Player
+    matchedPairs: number
+    moves: number
+    scores: PlayerScore
+    activePlayers: Player[]
+    playerMetadata: { [playerId: string]: any }
+    consecutiveMatches: { [playerId: string]: number }
+    gameStartTime: number | null
+  }
+
+  // HOVER: Networked hover state
+  playerHovers?: { [playerId: string]: string | null }
 }

 export type MemoryPairsAction =
@@ -101,6 +120,11 @@ export interface MemoryPairsContextValue {
  currentGameStatistics: GameStatistics
  gameMode: GameMode // Derived from global context
  activePlayers: Player[] // Active player IDs from arena
+  canModifyPlayers: boolean // Whether players can be added/removed (controls button visibility)
+
+  // PAUSE/RESUME: Computed pause/resume values
+  hasConfigChanged?: boolean
+  canResumeGame?: boolean

  // Actions
  startGame: () => void
@@ -108,6 +132,10 @@ export interface MemoryPairsContextValue {
  resetGame: () => void
  setGameType: (type: GameType) => void
  setDifficulty: (difficulty: Difficulty) => void
+  setTurnTimer?: (timer: number) => void
+  goToSetup?: () => void
+  resumeGame?: () => void
+  hoverCard?: (cardId: string | null) => void
  exitSession: () => void
 }

--- a/apps/web/src/app/arcade/matching/page.tsx
+++ b/apps/web/src/app/arcade/matching/page.tsx
@@ -1,13 +1,13 @@
 import { ArcadeGuardedPage } from '@/components/ArcadeGuardedPage'
 import { MemoryPairsGame } from './components/MemoryPairsGame'
-import { ArcadeMemoryPairsProvider } from './context/ArcadeMemoryPairsContext'
+import { LocalMemoryPairsProvider } from './context/LocalMemoryPairsProvider'

 export default function MatchingPage() {
  return (
    <ArcadeGuardedPage>
-      <ArcadeMemoryPairsProvider>
+      <LocalMemoryPairsProvider>
        <MemoryPairsGame />
-      </ArcadeMemoryPairsProvider>
+      </LocalMemoryPairsProvider>
    </ArcadeGuardedPage>
  )
 }
--- a/apps/web/src/app/arcade/room/page.tsx
+++ b/apps/web/src/app/arcade/room/page.tsx
@@ -1,33 +1,20 @@
 'use client'

-import { useRouter } from 'next/navigation'
-import { useEffect } from 'react'
-import { ArcadeGuardedPage } from '@/components/ArcadeGuardedPage'
 import { useRoomData } from '@/hooks/useRoomData'
 import { MemoryPairsGame } from '../matching/components/MemoryPairsGame'
-import { ArcadeMemoryPairsProvider } from '../matching/context/ArcadeMemoryPairsContext'
+import { RoomMemoryPairsProvider } from '../matching/context/RoomMemoryPairsProvider'

 /**
 * /arcade/room - Renders the game for the user's current room
 * Since users can only be in one room at a time, this is a simple singular route
+ *
+ * Note: We don't redirect to /arcade if no room exists because:
+ * - It would conflict with arcade session redirects and create loops
+ * - useArcadeRedirect on /arcade page handles redirecting to active sessions
 */
 export default function RoomPage() {
-  const router = useRouter()
  const { roomData, isLoading } = useRoomData()

-  // Debug logging
-  useEffect(() => {
-    console.log('[RoomPage] State:', { isLoading, hasRoomData: !!roomData, roomData })
-  }, [isLoading, roomData])
-
-  // Redirect to arcade if no room
-  useEffect(() => {
-    if (!isLoading && !roomData) {
-      console.log('[RoomPage] No active room, redirecting to /arcade')
-      router.push('/arcade')
-    }
-  }, [isLoading, roomData, router])
-
  // Show loading state
  if (isLoading) {
    return (
@@ -46,20 +33,44 @@ export default function RoomPage() {
    )
  }

-  // Show nothing while redirecting
+  // Show error if no room (instead of redirecting)
  if (!roomData) {
-    return null
+    return (
+      <div
+        style={{
+          display: 'flex',
+          flexDirection: 'column',
+          alignItems: 'center',
+          justifyContent: 'center',
+          height: '100vh',
+          fontSize: '18px',
+          color: '#666',
+          gap: '1rem',
+        }}
+      >
+        <div>No active room found</div>
+        <a
+          href="/arcade"
+          style={{
+            color: '#3b82f6',
+            textDecoration: 'underline',
+          }}
+        >
+          Go to Champion Arena
+        </a>
+      </div>
+    )
  }

  // Render the appropriate game based on room's gameName
+  // Note: We don't use ArcadeGuardedPage here because room-based games
+  // have their own navigation logic via useRoomData
  switch (roomData.gameName) {
    case 'matching':
      return (
-        <ArcadeGuardedPage>
-          <ArcadeMemoryPairsProvider>
-            <MemoryPairsGame />
-          </ArcadeMemoryPairsProvider>
-        </ArcadeGuardedPage>
+        <RoomMemoryPairsProvider>
+          <MemoryPairsGame />
+        </RoomMemoryPairsProvider>
      )

    // TODO: Add other games (complement-race, memory-quiz, etc.)
--- a/apps/web/src/app/arcade/rooms/[roomId]/complement-race/page.tsx
+++ b/apps/web/src/app/arcade/rooms/[roomId]/complement-race/page.tsx
@@ -1,24 +0,0 @@
-'use client'
-
-import { useParams } from 'next/navigation'
-import { PageWithNav } from '@/components/PageWithNav'
-import { ComplementRaceGame } from '@/app/arcade/complement-race/components/ComplementRaceGame'
-import { ComplementRaceProvider } from '@/app/arcade/complement-race/context/ComplementRaceContext'
-
-export default function RoomComplementRacePage() {
-  const params = useParams()
-  const roomId = params.roomId as string
-
-  // TODO Phase 4: Integrate room context with game state
-  // - Connect to room socket events
-  // - Sync game state across players
-  // - Handle multiplayer race dynamics
-
-  return (
-    <PageWithNav navTitle="Speed Complement Race" navEmoji="🏁">
-      <ComplementRaceProvider>
-        <ComplementRaceGame />
-      </ComplementRaceProvider>
-    </PageWithNav>
-  )
-}
--- a/apps/web/src/app/arcade/rooms/[roomId]/matching/page.tsx
+++ b/apps/web/src/app/arcade/rooms/[roomId]/matching/page.tsx
@@ -1,24 +0,0 @@
-'use client'
-
-import { useParams } from 'next/navigation'
-import { ArcadeGuardedPage } from '@/components/ArcadeGuardedPage'
-import { MemoryPairsGame } from '@/app/arcade/matching/components/MemoryPairsGame'
-import { ArcadeMemoryPairsProvider } from '@/app/arcade/matching/context/ArcadeMemoryPairsContext'
-
-export default function RoomMatchingPage() {
-  const params = useParams()
-  const roomId = params.roomId as string
-
-  // TODO Phase 4: Integrate room context with game state
-  // - Connect to room socket events
-  // - Sync game state across players
-  // - Handle multiplayer moves
-
-  return (
-    <ArcadeGuardedPage>
-      <ArcadeMemoryPairsProvider>
-        <MemoryPairsGame />
-      </ArcadeMemoryPairsProvider>
-    </ArcadeGuardedPage>
-  )
-}
--- a/apps/web/src/app/arcade/rooms/[roomId]/memory-quiz/page.tsx
+++ b/apps/web/src/app/arcade/rooms/[roomId]/memory-quiz/page.tsx
@@ -1,16 +0,0 @@
-'use client'
-
-import { useParams } from 'next/navigation'
-
-// Temporarily redirect to solo arcade version
-// TODO Phase 4: Implement room-aware memory quiz with multiplayer sync
-export default function RoomMemoryQuizPage() {
-  const params = useParams()
-  const roomId = params.roomId as string
-
-  // Import and use the arcade version for now
-  // This prevents 404s while we work on full multiplayer integration
-  const MemoryQuizGame = require('@/app/arcade/memory-quiz/page').default
-
-  return <MemoryQuizGame />
-}
--- a/apps/web/src/app/games/matching/context/types.js
+++ b/apps/web/src/app/games/matching/context/types.js
@@ -0,0 +1,3 @@
+"use strict";
+// TypeScript interfaces for Memory Pairs Challenge game
+Object.defineProperty(exports, "__esModule", { value: true });
--- a/apps/web/src/app/games/matching/context/types.ts
+++ b/apps/web/src/app/games/matching/context/types.ts
@@ -40,6 +40,20 @@ export interface GameStatistics {
  averageTimePerMove: number
 }

+export interface PlayerMetadata {
+  id: string // Player ID
+  name: string
+  emoji: string
+  userId: string // Which user owns this player
+  color?: string
+}
+
+export interface GameConfiguration {
+  gameType: GameType
+  difficulty: Difficulty
+  turnTimer: number
+}
+
 export interface MemoryPairsState {
  // Core game data
  cards: GameCard[]
@@ -51,6 +65,22 @@ export interface MemoryPairsState {
  difficulty: Difficulty
  turnTimer: number // Seconds for two-player mode

+  // Paused game state - for Resume functionality
+  originalConfig?: GameConfiguration // Config when game started - used to detect changes
+  pausedGamePhase?: 'playing' | 'results' // Set when GO_TO_SETUP called from active game
+  pausedGameState?: {
+    // Snapshot of game state when paused
+    gameCards: GameCard[]
+    currentPlayer: Player
+    matchedPairs: number
+    moves: number
+    scores: PlayerScore
+    activePlayers: Player[]
+    playerMetadata: { [playerId: string]: PlayerMetadata }
+    consecutiveMatches: { [playerId: string]: number }
+    gameStartTime: number | null
+  }
+
  // Game progression
  gamePhase: GamePhase
  currentPlayer: Player
@@ -59,6 +89,7 @@ export interface MemoryPairsState {
  moves: number
  scores: PlayerScore
  activePlayers: Player[] // Track active player IDs
+  playerMetadata: { [playerId: string]: PlayerMetadata } // Player metadata snapshot for cross-user visibility
  consecutiveMatches: { [playerId: string]: number } // Track consecutive matches per player

  // Timing
@@ -72,6 +103,9 @@ export interface MemoryPairsState {
  isProcessingMove: boolean
  showMismatchFeedback: boolean
  lastMatchedPair: [string, string] | null
+
+  // Hover state for networked presence
+  playerHovers: { [playerId: string]: string | null } // playerId -> cardId (or null if not hovering)
 }

 export type MemoryPairsAction =
@@ -101,13 +135,19 @@ export interface MemoryPairsContextValue {
  currentGameStatistics: GameStatistics
  gameMode: GameMode // Derived from global context
  activePlayers: Player[] // Active player IDs from arena
+  hasConfigChanged: boolean // True if current config differs from originalConfig
+  canResumeGame: boolean // True if there's a paused game and config hasn't changed

  // Actions
  startGame: () => void
+  resumeGame: () => void
  flipCard: (cardId: string) => void
  resetGame: () => void
  setGameType: (type: GameType) => void
  setDifficulty: (difficulty: Difficulty) => void
+  setTurnTimer: (timer: number) => void
+  hoverCard: (cardId: string | null) => void // Send hover state for networked presence
+  goToSetup: () => void
  exitSession: () => void // Exit arcade session (no-op for non-arcade mode)
 }

@@ -133,14 +173,6 @@ export interface GameGridProps {
  disabled?: boolean
 }

-// Configuration interfaces
-export interface GameConfiguration {
-  gameMode: GameMode
-  gameType: GameType
-  difficulty: Difficulty
-  turnTimer: number
-}
-
 export interface MatchValidationResult {
  isValid: boolean
  reason?: string
--- a/apps/web/src/app/games/matching/utils/cardGeneration.js
+++ b/apps/web/src/app/games/matching/utils/cardGeneration.js
@@ -0,0 +1,164 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.generateAbacusNumeralCards = generateAbacusNumeralCards;
+exports.generateComplementCards = generateComplementCards;
+exports.generateGameCards = generateGameCards;
+exports.getGridConfiguration = getGridConfiguration;
+exports.generateCardId = generateCardId;
+// Utility function to generate unique random numbers
+function generateUniqueNumbers(count, options) {
+    const numbers = new Set();
+    const { min, max } = options;
+    while (numbers.size < count) {
+        const randomNum = Math.floor(Math.random() * (max - min + 1)) + min;
+        numbers.add(randomNum);
+    }
+    return Array.from(numbers);
+}
+// Utility function to shuffle an array
+function shuffleArray(array) {
+    const shuffled = [...array];
+    for (let i = shuffled.length - 1; i > 0; i--) {
+        const j = Math.floor(Math.random() * (i + 1));
+        [shuffled[i], shuffled[j]] = [shuffled[j], shuffled[i]];
+    }
+    return shuffled;
+}
+// Generate cards for abacus-numeral game mode
+function generateAbacusNumeralCards(pairs) {
+    // Generate unique numbers based on difficulty
+    // For easier games, use smaller numbers; for harder games, use larger ranges
+    const numberRanges = {
+        6: { min: 1, max: 50 }, // 6 pairs: 1-50
+        8: { min: 1, max: 100 }, // 8 pairs: 1-100
+        12: { min: 1, max: 200 }, // 12 pairs: 1-200
+        15: { min: 1, max: 300 }, // 15 pairs: 1-300
+    };
+    const range = numberRanges[pairs];
+    const numbers = generateUniqueNumbers(pairs, range);
+    const cards = [];
+    numbers.forEach((number) => {
+        // Abacus representation card
+        cards.push({
+            id: `abacus_${number}`,
+            type: 'abacus',
+            number,
+            matched: false,
+        });
+        // Numerical representation card
+        cards.push({
+            id: `number_${number}`,
+            type: 'number',
+            number,
+            matched: false,
+        });
+    });
+    return shuffleArray(cards);
+}
+// Generate cards for complement pairs game mode
+function generateComplementCards(pairs) {
+    // Define complement pairs for friends of 5 and friends of 10
+    const complementPairs = [
+        // Friends of 5
+        { pair: [0, 5], targetSum: 5 },
+        { pair: [1, 4], targetSum: 5 },
+        { pair: [2, 3], targetSum: 5 },
+        // Friends of 10
+        { pair: [0, 10], targetSum: 10 },
+        { pair: [1, 9], targetSum: 10 },
+        { pair: [2, 8], targetSum: 10 },
+        { pair: [3, 7], targetSum: 10 },
+        { pair: [4, 6], targetSum: 10 },
+        { pair: [5, 5], targetSum: 10 },
+        // Additional pairs for higher difficulties
+        { pair: [6, 4], targetSum: 10 },
+        { pair: [7, 3], targetSum: 10 },
+        { pair: [8, 2], targetSum: 10 },
+        { pair: [9, 1], targetSum: 10 },
+        { pair: [10, 0], targetSum: 10 },
+        // More challenging pairs (can be used for expert mode)
+        { pair: [11, 9], targetSum: 20 },
+        { pair: [12, 8], targetSum: 20 },
+    ];
+    // Select the required number of complement pairs
+    const selectedPairs = complementPairs.slice(0, pairs);
+    const cards = [];
+    selectedPairs.forEach(({ pair: [num1, num2], targetSum }, index) => {
+        // First number in the pair
+        cards.push({
+            id: `comp1_${index}_${num1}`,
+            type: 'complement',
+            number: num1,
+            complement: num2,
+            targetSum,
+            matched: false,
+        });
+        // Second number in the pair
+        cards.push({
+            id: `comp2_${index}_${num2}`,
+            type: 'complement',
+            number: num2,
+            complement: num1,
+            targetSum,
+            matched: false,
+        });
+    });
+    return shuffleArray(cards);
+}
+// Main card generation function
+function generateGameCards(gameType, difficulty) {
+    switch (gameType) {
+        case 'abacus-numeral':
+            return generateAbacusNumeralCards(difficulty);
+        case 'complement-pairs':
+            return generateComplementCards(difficulty);
+        default:
+            throw new Error(`Unknown game type: ${gameType}`);
+    }
+}
+// Utility function to get responsive grid configuration based on difficulty and screen size
+function getGridConfiguration(difficulty) {
+    const configs = {
+        6: {
+            totalCards: 12,
+            mobileColumns: 3, // 3x4 grid in portrait
+            tabletColumns: 4, // 4x3 grid on tablet
+            desktopColumns: 4, // 4x3 grid on desktop
+            landscapeColumns: 6, // 6x2 grid in landscape
+            cardSize: { width: '140px', height: '180px' },
+            gridTemplate: 'repeat(3, 1fr)',
+        },
+        8: {
+            totalCards: 16,
+            mobileColumns: 3, // 3x6 grid in portrait (some spillover)
+            tabletColumns: 4, // 4x4 grid on tablet
+            desktopColumns: 4, // 4x4 grid on desktop
+            landscapeColumns: 6, // 6x3 grid in landscape (some spillover)
+            cardSize: { width: '120px', height: '160px' },
+            gridTemplate: 'repeat(3, 1fr)',
+        },
+        12: {
+            totalCards: 24,
+            mobileColumns: 3, // 3x8 grid in portrait
+            tabletColumns: 4, // 4x6 grid on tablet
+            desktopColumns: 6, // 6x4 grid on desktop
+            landscapeColumns: 6, // 6x4 grid in landscape (changed from 8x3)
+            cardSize: { width: '100px', height: '140px' },
+            gridTemplate: 'repeat(3, 1fr)',
+        },
+        15: {
+            totalCards: 30,
+            mobileColumns: 3, // 3x10 grid in portrait
+            tabletColumns: 5, // 5x6 grid on tablet
+            desktopColumns: 6, // 6x5 grid on desktop
+            landscapeColumns: 10, // 10x3 grid in landscape
+            cardSize: { width: '90px', height: '120px' },
+            gridTemplate: 'repeat(3, 1fr)',
+        },
+    };
+    return configs[difficulty];
+}
+// Generate a unique ID for cards
+function generateCardId(type, identifier) {
+    return `${type}_${identifier}_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
+}
--- a/apps/web/src/app/games/matching/utils/matchValidation.js
+++ b/apps/web/src/app/games/matching/utils/matchValidation.js
@@ -0,0 +1,188 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.validateAbacusNumeralMatch = validateAbacusNumeralMatch;
+exports.validateComplementMatch = validateComplementMatch;
+exports.validateMatch = validateMatch;
+exports.canFlipCard = canFlipCard;
+exports.getMatchHint = getMatchHint;
+exports.calculateMatchScore = calculateMatchScore;
+exports.analyzeGamePerformance = analyzeGamePerformance;
+// Validate abacus-numeral match (abacus card matches with number card of same value)
+function validateAbacusNumeralMatch(card1, card2) {
+    // Both cards must have the same number
+    if (card1.number !== card2.number) {
+        return {
+            isValid: false,
+            reason: 'Numbers do not match',
+            type: 'invalid',
+        };
+    }
+    // Cards must be different types (one abacus, one number)
+    if (card1.type === card2.type) {
+        return {
+            isValid: false,
+            reason: 'Both cards are the same type',
+            type: 'invalid',
+        };
+    }
+    // One must be abacus, one must be number
+    const hasAbacus = card1.type === 'abacus' || card2.type === 'abacus';
+    const hasNumber = card1.type === 'number' || card2.type === 'number';
+    if (!hasAbacus || !hasNumber) {
+        return {
+            isValid: false,
+            reason: 'Must match abacus with number representation',
+            type: 'invalid',
+        };
+    }
+    // Neither should be complement type for this game mode
+    if (card1.type === 'complement' || card2.type === 'complement') {
+        return {
+            isValid: false,
+            reason: 'Complement cards not valid in abacus-numeral mode',
+            type: 'invalid',
+        };
+    }
+    return {
+        isValid: true,
+        type: 'abacus-numeral',
+    };
+}
+// Validate complement match (two numbers that add up to target sum)
+function validateComplementMatch(card1, card2) {
+    // Both cards must be complement type
+    if (card1.type !== 'complement' || card2.type !== 'complement') {
+        return {
+            isValid: false,
+            reason: 'Both cards must be complement type',
+            type: 'invalid',
+        };
+    }
+    // Both cards must have the same target sum
+    if (card1.targetSum !== card2.targetSum) {
+        return {
+            isValid: false,
+            reason: 'Cards have different target sums',
+            type: 'invalid',
+        };
+    }
+    // Check if the numbers are actually complements
+    if (!card1.complement || !card2.complement) {
+        return {
+            isValid: false,
+            reason: 'Complement information missing',
+            type: 'invalid',
+        };
+    }
+    // Verify the complement relationship
+    if (card1.number !== card2.complement || card2.number !== card1.complement) {
+        return {
+            isValid: false,
+            reason: 'Numbers are not complements of each other',
+            type: 'invalid',
+        };
+    }
+    // Verify the sum equals the target
+    const sum = card1.number + card2.number;
+    if (sum !== card1.targetSum) {
+        return {
+            isValid: false,
+            reason: `Sum ${sum} does not equal target ${card1.targetSum}`,
+            type: 'invalid',
+        };
+    }
+    return {
+        isValid: true,
+        type: 'complement',
+    };
+}
+// Main validation function that determines which validation to use
+function validateMatch(card1, card2) {
+    // Cannot match the same card with itself
+    if (card1.id === card2.id) {
+        return {
+            isValid: false,
+            reason: 'Cannot match card with itself',
+            type: 'invalid',
+        };
+    }
+    // Cannot match already matched cards
+    if (card1.matched || card2.matched) {
+        return {
+            isValid: false,
+            reason: 'Cannot match already matched cards',
+            type: 'invalid',
+        };
+    }
+    // Determine which type of match to validate based on card types
+    const hasComplement = card1.type === 'complement' || card2.type === 'complement';
+    if (hasComplement) {
+        // If either card is complement type, use complement validation
+        return validateComplementMatch(card1, card2);
+    }
+    else {
+        // Otherwise, use abacus-numeral validation
+        return validateAbacusNumeralMatch(card1, card2);
+    }
+}
+// Helper function to check if a card can be flipped
+function canFlipCard(card, flippedCards, isProcessingMove) {
+    // Cannot flip if processing a move
+    if (isProcessingMove)
+        return false;
+    // Cannot flip already matched cards
+    if (card.matched)
+        return false;
+    // Cannot flip if already flipped
+    if (flippedCards.some((c) => c.id === card.id))
+        return false;
+    // Cannot flip if two cards are already flipped
+    if (flippedCards.length >= 2)
+        return false;
+    return true;
+}
+// Get hint for what kind of match the player should look for
+function getMatchHint(card) {
+    switch (card.type) {
+        case 'abacus':
+            return `Find the number ${card.number}`;
+        case 'number':
+            return `Find the abacus showing ${card.number}`;
+        case 'complement':
+            if (card.complement !== undefined && card.targetSum !== undefined) {
+                return `Find ${card.complement} to make ${card.targetSum}`;
+            }
+            return 'Find the matching complement';
+        default:
+            return 'Find the matching card';
+    }
+}
+// Calculate match score based on difficulty and time
+function calculateMatchScore(difficulty, timeForMatch, isComplementMatch) {
+    const baseScore = isComplementMatch ? 15 : 10; // Complement matches worth more
+    const difficultyMultiplier = difficulty / 6; // Scale with difficulty
+    const timeBonus = Math.max(0, (10000 - timeForMatch) / 1000); // Bonus for speed
+    return Math.round(baseScore * difficultyMultiplier + timeBonus);
+}
+// Analyze game performance
+function analyzeGamePerformance(totalMoves, matchedPairs, totalPairs, gameTime) {
+    const accuracy = totalMoves > 0 ? (matchedPairs / totalMoves) * 100 : 0;
+    const efficiency = totalPairs > 0 ? (matchedPairs / (totalPairs * 2)) * 100 : 0; // Ideal is 100% (each pair found in 2 moves)
+    const averageTimePerMove = totalMoves > 0 ? gameTime / totalMoves : 0;
+    // Calculate grade based on accuracy and efficiency
+    let grade = 'F';
+    if (accuracy >= 90 && efficiency >= 80)
+        grade = 'A';
+    else if (accuracy >= 80 && efficiency >= 70)
+        grade = 'B';
+    else if (accuracy >= 70 && efficiency >= 60)
+        grade = 'C';
+    else if (accuracy >= 60 && efficiency >= 50)
+        grade = 'D';
+    return {
+        accuracy,
+        efficiency,
+        averageTimePerMove,
+        grade,
+    };
+}
--- a/apps/web/src/components/PageWithNav.tsx
+++ b/apps/web/src/components/PageWithNav.tsx
@@ -58,14 +58,14 @@ export function PageWithNav({
  }

  // Get active and inactive players as arrays
+  // Only show LOCAL players in the active/inactive lists (remote players shown separately in networkPlayers)
  const activePlayerList = Array.from(activePlayers)
    .map((id) => players.get(id))
-    .filter((p) => p !== undefined)
-    .map((p) => ({ id: p.id, name: p.name, emoji: p.emoji }))
+    .filter((p): p is NonNullable<typeof p> => p !== undefined && p.isLocal !== false) // Filter out remote players

-  const inactivePlayerList = Array.from(players.values())
-    .filter((p) => !activePlayers.has(p.id))
-    .map((p) => ({ id: p.id, name: p.name, emoji: p.emoji }))
+  const inactivePlayerList = Array.from(players.values()).filter(
+    (p) => !activePlayers.has(p.id) && p.isLocal !== false
+  ) // Filter out remote players

  // Compute game mode from active player count
  const gameMode =
@@ -98,7 +98,13 @@ export function PageWithNav({
        : undefined

  // Compute network players (other players in the room, excluding current user)
-  const networkPlayers: Array<{ id: string; emoji?: string; name?: string }> =
+  const networkPlayers: Array<{
+    id: string
+    emoji?: string
+    name?: string
+    color?: string
+    memberName?: string
+  }> =
    isInRoom && roomData
      ? roomData.members
          .filter((member) => member.userId !== viewerId)
@@ -107,7 +113,9 @@ export function PageWithNav({
            return memberPlayerList.map((player) => ({
              id: player.id,
              emoji: player.emoji,
-              name: `${player.name} (${member.displayName})`,
+              name: player.name,
+              color: player.color,
+              memberName: member.displayName,
            }))
          })
      : []
--- a/apps/web/src/components/nav/ActivePlayersList.tsx
+++ b/apps/web/src/components/nav/ActivePlayersList.tsx
@@ -1,9 +1,13 @@
 import React from 'react'
+import { PlayerTooltip } from './PlayerTooltip'

 interface Player {
  id: string
  name: string
  emoji: string
+  color?: string
+  createdAt?: Date | number
+  isLocal?: boolean
 }

 interface ActivePlayersListProps {
@@ -24,105 +28,111 @@ export function ActivePlayersList({
  return (
    <>
      {activePlayers.map((player) => (
-        <div
+        <PlayerTooltip
          key={player.id}
-          style={{
-            position: 'relative',
-            fontSize: shouldEmphasize ? '48px' : '20px',
-            lineHeight: 1,
-            transition: 'font-size 0.4s cubic-bezier(0.4, 0, 0.2, 1), filter 0.4s ease',
-            filter: shouldEmphasize ? 'drop-shadow(0 4px 8px rgba(0,0,0,0.25))' : 'none',
-            cursor: shouldEmphasize ? 'pointer' : 'default',
-          }}
-          title={player.name}
-          onClick={() => shouldEmphasize && onConfigurePlayer(player.id)}
-          onMouseEnter={() => shouldEmphasize && setHoveredPlayerId(player.id)}
-          onMouseLeave={() => shouldEmphasize && setHoveredPlayerId(null)}
+          playerName={player.name}
+          playerColor={player.color}
+          isLocal={player.isLocal !== false}
+          createdAt={player.createdAt}
        >
-          {player.emoji}
-          {shouldEmphasize && hoveredPlayerId === player.id && (
-            <>
-              {/* Configure button - bottom left */}
-              <button
-                onClick={(e) => {
-                  e.stopPropagation()
-                  onConfigurePlayer(player.id)
-                }}
-                style={{
-                  position: 'absolute',
-                  bottom: '-4px',
-                  left: '-4px',
-                  width: '18px',
-                  height: '18px',
-                  borderRadius: '50%',
-                  border: '2px solid white',
-                  background: '#6b7280',
-                  color: 'white',
-                  fontSize: '10px',
-                  display: 'flex',
-                  alignItems: 'center',
-                  justifyContent: 'center',
-                  cursor: 'pointer',
-                  boxShadow: '0 2px 8px rgba(0,0,0,0.3)',
-                  transition: 'all 0.2s ease',
-                  padding: 0,
-                  lineHeight: 1,
-                }}
-                onMouseEnter={(e) => {
-                  e.currentTarget.style.background = '#3b82f6'
-                  e.currentTarget.style.transform = 'scale(1.15)'
-                }}
-                onMouseLeave={(e) => {
-                  e.currentTarget.style.background = '#6b7280'
-                  e.currentTarget.style.transform = 'scale(1)'
-                }}
-                aria-label={`Configure ${player.name}`}
-              >
-                ⚙
-              </button>
+          <div
+            style={{
+              position: 'relative',
+              fontSize: shouldEmphasize ? '48px' : '20px',
+              lineHeight: 1,
+              transition: 'font-size 0.4s cubic-bezier(0.4, 0, 0.2, 1), filter 0.4s ease',
+              filter: shouldEmphasize ? 'drop-shadow(0 4px 8px rgba(0,0,0,0.25))' : 'none',
+              cursor: shouldEmphasize ? 'pointer' : 'default',
+            }}
+            onClick={() => shouldEmphasize && onConfigurePlayer(player.id)}
+            onMouseEnter={() => shouldEmphasize && setHoveredPlayerId(player.id)}
+            onMouseLeave={() => shouldEmphasize && setHoveredPlayerId(null)}
+          >
+            {player.emoji}
+            {shouldEmphasize && hoveredPlayerId === player.id && (
+              <>
+                {/* Configure button - bottom left */}
+                <button
+                  onClick={(e) => {
+                    e.stopPropagation()
+                    onConfigurePlayer(player.id)
+                  }}
+                  style={{
+                    position: 'absolute',
+                    bottom: '-4px',
+                    left: '-4px',
+                    width: '18px',
+                    height: '18px',
+                    borderRadius: '50%',
+                    border: '2px solid white',
+                    background: '#6b7280',
+                    color: 'white',
+                    fontSize: '10px',
+                    display: 'flex',
+                    alignItems: 'center',
+                    justifyContent: 'center',
+                    cursor: 'pointer',
+                    boxShadow: '0 2px 8px rgba(0,0,0,0.3)',
+                    transition: 'all 0.2s ease',
+                    padding: 0,
+                    lineHeight: 1,
+                  }}
+                  onMouseEnter={(e) => {
+                    e.currentTarget.style.background = '#3b82f6'
+                    e.currentTarget.style.transform = 'scale(1.15)'
+                  }}
+                  onMouseLeave={(e) => {
+                    e.currentTarget.style.background = '#6b7280'
+                    e.currentTarget.style.transform = 'scale(1)'
+                  }}
+                  aria-label={`Configure ${player.name}`}
+                >
+                  ⚙
+                </button>

-              {/* Remove button - top right */}
-              <button
-                onClick={(e) => {
-                  e.stopPropagation()
-                  onRemovePlayer(player.id)
-                }}
-                style={{
-                  position: 'absolute',
-                  top: '-4px',
-                  right: '-4px',
-                  width: '20px',
-                  height: '20px',
-                  borderRadius: '50%',
-                  border: '2px solid white',
-                  background: '#ef4444',
-                  color: 'white',
-                  fontSize: '12px',
-                  fontWeight: 'bold',
-                  display: 'flex',
-                  alignItems: 'center',
-                  justifyContent: 'center',
-                  cursor: 'pointer',
-                  boxShadow: '0 2px 8px rgba(0,0,0,0.3)',
-                  transition: 'all 0.2s ease',
-                  padding: 0,
-                  lineHeight: 1,
-                }}
-                onMouseEnter={(e) => {
-                  e.currentTarget.style.background = '#dc2626'
-                  e.currentTarget.style.transform = 'scale(1.1)'
-                }}
-                onMouseLeave={(e) => {
-                  e.currentTarget.style.background = '#ef4444'
-                  e.currentTarget.style.transform = 'scale(1)'
-                }}
-                aria-label={`Remove ${player.name}`}
-              >
-                ×
-              </button>
-            </>
-          )}
-        </div>
+                {/* Remove button - top right */}
+                <button
+                  onClick={(e) => {
+                    e.stopPropagation()
+                    onRemovePlayer(player.id)
+                  }}
+                  style={{
+                    position: 'absolute',
+                    top: '-4px',
+                    right: '-4px',
+                    width: '20px',
+                    height: '20px',
+                    borderRadius: '50%',
+                    border: '2px solid white',
+                    background: '#ef4444',
+                    color: 'white',
+                    fontSize: '12px',
+                    fontWeight: 'bold',
+                    display: 'flex',
+                    alignItems: 'center',
+                    justifyContent: 'center',
+                    cursor: 'pointer',
+                    boxShadow: '0 2px 8px rgba(0,0,0,0.3)',
+                    transition: 'all 0.2s ease',
+                    padding: 0,
+                    lineHeight: 1,
+                  }}
+                  onMouseEnter={(e) => {
+                    e.currentTarget.style.background = '#dc2626'
+                    e.currentTarget.style.transform = 'scale(1.1)'
+                  }}
+                  onMouseLeave={(e) => {
+                    e.currentTarget.style.background = '#ef4444'
+                    e.currentTarget.style.transform = 'scale(1)'
+                  }}
+                  aria-label={`Remove ${player.name}`}
+                >
+                  ×
+                </button>
+              </>
+            )}
+          </div>
+        </PlayerTooltip>
      ))}
    </>
  )
--- a/apps/web/src/components/nav/NetworkPlayerIndicator.tsx
+++ b/apps/web/src/components/nav/NetworkPlayerIndicator.tsx
@@ -1,9 +1,12 @@
 import React from 'react'
+import { PlayerTooltip } from './PlayerTooltip'

 interface NetworkPlayer {
  id: string
  emoji?: string
  name?: string
+  color?: string
+  memberName?: string
 }

 interface NetworkPlayerIndicatorProps {
@@ -17,92 +20,97 @@ interface NetworkPlayerIndicatorProps {
 */
 export function NetworkPlayerIndicator({ player, shouldEmphasize }: NetworkPlayerIndicatorProps) {
  const [isHovered, setIsHovered] = React.useState(false)
+  const playerName = player.name || `Network Player ${player.id.slice(0, 8)}`
+  const extraInfo = player.memberName ? `Controlled by ${player.memberName}` : undefined

  return (
-    <div
-      style={{
-        position: 'relative',
-        fontSize: shouldEmphasize ? '48px' : '20px',
-        lineHeight: 1,
-        transition: 'all 0.4s cubic-bezier(0.4, 0, 0.2, 1)',
-        cursor: 'default',
-      }}
-      title={player.name || `Network Player ${player.id.slice(0, 8)}`}
-      onMouseEnter={() => setIsHovered(true)}
-      onMouseLeave={() => setIsHovered(false)}
+    <PlayerTooltip
+      playerName={playerName}
+      playerColor={player.color}
+      isLocal={false}
+      extraInfo={extraInfo}
    >
-      {/* Network frame border */}
      <div
        style={{
-          position: 'absolute',
-          inset: '-6px',
-          borderRadius: '8px',
-          background: `
+          position: 'relative',
+          fontSize: shouldEmphasize ? '48px' : '20px',
+          lineHeight: 1,
+          transition: 'all 0.4s cubic-bezier(0.4, 0, 0.2, 1)',
+          cursor: 'default',
+        }}
+        onMouseEnter={() => setIsHovered(true)}
+        onMouseLeave={() => setIsHovered(false)}
+      >
+        {/* Network frame border */}
+        <div
+          style={{
+            position: 'absolute',
+            inset: '-6px',
+            borderRadius: '8px',
+            background: `
            linear-gradient(135deg,
              rgba(59, 130, 246, 0.4),
              rgba(147, 51, 234, 0.4),
              rgba(236, 72, 153, 0.4))
          `,
-          opacity: isHovered ? 1 : 0.7,
-          transition: 'opacity 0.2s ease',
-          zIndex: -1,
-        }}
-      />
+            opacity: isHovered ? 1 : 0.7,
+            transition: 'opacity 0.2s ease',
+            zIndex: -1,
+          }}
+        />

-      {/* Animated network signal indicator */}
-      <div
-        style={{
-          position: 'absolute',
-          top: '-8px',
-          right: '-8px',
-          width: '12px',
-          height: '12px',
-          borderRadius: '50%',
-          background: 'rgba(34, 197, 94, 0.9)',
-          boxShadow: '0 0 8px rgba(34, 197, 94, 0.6)',
-          animation: 'networkPulse 2s ease-in-out infinite',
-          zIndex: 1,
-        }}
-        title="Connected"
-      />
+        {/* Animated network signal indicator */}
+        <div
+          style={{
+            position: 'absolute',
+            top: '-8px',
+            right: '-8px',
+            width: '12px',
+            height: '12px',
+            borderRadius: '50%',
+            background: 'rgba(34, 197, 94, 0.9)',
+            boxShadow: '0 0 8px rgba(34, 197, 94, 0.6)',
+            animation: 'networkPulse 2s ease-in-out infinite',
+            zIndex: 1,
+          }}
+        />

-      {/* Player emoji or fallback */}
-      <div
-        style={{
-          position: 'relative',
-          filter: shouldEmphasize ? 'drop-shadow(0 4px 8px rgba(0,0,0,0.25))' : 'none',
-        }}
-      >
-        {player.emoji || '🌐'}
-      </div>
+        {/* Player emoji or fallback */}
+        <div
+          style={{
+            position: 'relative',
+            filter: shouldEmphasize ? 'drop-shadow(0 4px 8px rgba(0,0,0,0.25))' : 'none',
+          }}
+        >
+          {player.emoji || '🌐'}
+        </div>

-      {/* Network icon badge */}
-      <div
-        style={{
-          position: 'absolute',
-          bottom: '-4px',
-          left: '-4px',
-          width: '16px',
-          height: '16px',
-          borderRadius: '50%',
-          border: '2px solid white',
-          background: 'linear-gradient(135deg, #3b82f6, #8b5cf6)',
-          color: 'white',
-          fontSize: '8px',
-          display: 'flex',
-          alignItems: 'center',
-          justifyContent: 'center',
-          boxShadow: '0 2px 6px rgba(0,0,0,0.3)',
-          zIndex: 1,
-        }}
-        title="Network Player"
-      >
-        📡
-      </div>
+        {/* Network icon badge */}
+        <div
+          style={{
+            position: 'absolute',
+            bottom: '-4px',
+            left: '-4px',
+            width: '16px',
+            height: '16px',
+            borderRadius: '50%',
+            border: '2px solid white',
+            background: 'linear-gradient(135deg, #3b82f6, #8b5cf6)',
+            color: 'white',
+            fontSize: '8px',
+            display: 'flex',
+            alignItems: 'center',
+            justifyContent: 'center',
+            boxShadow: '0 2px 6px rgba(0,0,0,0.3)',
+            zIndex: 1,
+          }}
+        >
+          📡
+        </div>

-      <style
-        dangerouslySetInnerHTML={{
-          __html: `
+        <style
+          dangerouslySetInnerHTML={{
+            __html: `
            @keyframes networkPulse {
              0%, 100% {
                opacity: 1;
@@ -114,8 +122,9 @@ export function NetworkPlayerIndicator({ player, shouldEmphasize }: NetworkPlaye
              }
            }
          `,
-        }}
-      />
-    </div>
+          }}
+        />
+      </div>
+    </PlayerTooltip>
  )
 }
--- a/apps/web/src/components/nav/PlayerConfigDialog.tsx
+++ b/apps/web/src/components/nav/PlayerConfigDialog.tsx
@@ -1,4 +1,4 @@
-import { useState } from 'react'
+import { useEffect, useRef, useState } from 'react'
 import { EmojiPicker } from '../../app/games/matching/components/EmojiPicker'
 import { useGameMode } from '../../contexts/GameModeContext'

@@ -11,17 +11,36 @@ export function PlayerConfigDialog({ playerId, onClose }: PlayerConfigDialogProp
  // All hooks must be called before early return
  const { getPlayer, updatePlayer, players } = useGameMode()
  const [showEmojiPicker, setShowEmojiPicker] = useState(false)
+  const [localName, setLocalName] = useState('')
+  const [isSaving, setIsSaving] = useState(false)
+  const debounceTimerRef = useRef<NodeJS.Timeout | null>(null)

  const player = getPlayer(playerId)
-  const [tempName, setTempName] = useState(player?.name || '')
+
+  // Initialize local name from player
+  useEffect(() => {
+    if (player) {
+      setLocalName(player.name)
+    }
+  }, [player])

  if (!player) {
    return null
  }

-  const handleSave = () => {
-    updatePlayer(playerId, { name: tempName })
-    onClose()
+  const handleNameChange = (newName: string) => {
+    setLocalName(newName)
+
+    // Debounce the update to avoid too many API calls
+    if (debounceTimerRef.current) {
+      clearTimeout(debounceTimerRef.current)
+    }
+
+    setIsSaving(true)
+    debounceTimerRef.current = setTimeout(() => {
+      updatePlayer(playerId, { name: newName })
+      setIsSaving(false)
+    }, 500) // Wait 500ms after user stops typing
  }

  const handleEmojiSelect = (emoji: string) => {
@@ -30,7 +49,21 @@ export function PlayerConfigDialog({ playerId, onClose }: PlayerConfigDialogProp
  }

  // Get player number for UI theming (first 4 players get special colors)
-  const allPlayers = Array.from(players.values()).sort((a, b) => a.createdAt - b.createdAt)
+  const allPlayers = Array.from(players.values()).sort((a, b) => {
+    const aTime =
+      typeof a.createdAt === 'number'
+        ? a.createdAt
+        : a.createdAt instanceof Date
+          ? a.createdAt.getTime()
+          : 0
+    const bTime =
+      typeof b.createdAt === 'number'
+        ? b.createdAt
+        : b.createdAt instanceof Date
+          ? b.createdAt.getTime()
+          : 0
+    return aTime - bTime
+  })
  const playerIndex = allPlayers.findIndex((p) => p.id === playerId)
  const displayNumber = playerIndex + 1

@@ -81,22 +114,35 @@ export function PlayerConfigDialog({ playerId, onClose }: PlayerConfigDialogProp
          style={{
            display: 'flex',
            justifyContent: 'space-between',
-            alignItems: 'center',
+            alignItems: 'flex-start',
            marginBottom: '24px',
          }}
        >
-          <h2
-            style={{
-              fontSize: '24px',
-              fontWeight: 'bold',
-              background: `linear-gradient(135deg, ${gradientColor}, ${gradientColor}dd)`,
-              backgroundClip: 'text',
-              color: 'transparent',
-              margin: 0,
-            }}
-          >
-            Configure Player
-          </h2>
+          <div>
+            <h2
+              style={{
+                fontSize: '24px',
+                fontWeight: 'bold',
+                background: `linear-gradient(135deg, ${gradientColor}, ${gradientColor}dd)`,
+                backgroundClip: 'text',
+                color: 'transparent',
+                margin: 0,
+                marginBottom: '4px',
+              }}
+            >
+              Player Settings
+            </h2>
+            <div
+              style={{
+                fontSize: '12px',
+                color: isSaving ? '#f59e0b' : '#10b981',
+                fontWeight: '500',
+                opacity: 0.8,
+              }}
+            >
+              {isSaving ? '💾 Saving...' : '✓ Changes saved automatically'}
+            </div>
+          </div>
          <button
            onClick={onClose}
            style={{
@@ -198,7 +244,7 @@ export function PlayerConfigDialog({ playerId, onClose }: PlayerConfigDialogProp
        </div>

        {/* Name Input */}
-        <div style={{ marginBottom: '24px' }}>
+        <div>
          <label
            style={{
              display: 'block',
@@ -212,8 +258,8 @@ export function PlayerConfigDialog({ playerId, onClose }: PlayerConfigDialogProp
          </label>
          <input
            type="text"
-            value={tempName}
-            onChange={(e) => setTempName(e.target.value)}
+            value={localName}
+            onChange={(e) => handleNameChange(e.target.value)}
            placeholder="Player Name"
            maxLength={20}
            style={{
@@ -243,69 +289,9 @@ export function PlayerConfigDialog({ playerId, onClose }: PlayerConfigDialogProp
              textAlign: 'right',
            }}
          >
-            {tempName.length}/20 characters
+            {localName.length}/20 characters
          </div>
        </div>
-
-        {/* Action Buttons */}
-        <div
-          style={{
-            display: 'flex',
-            gap: '12px',
-          }}
-        >
-          <button
-            onClick={onClose}
-            style={{
-              flex: 1,
-              padding: '12px',
-              background: 'white',
-              border: '2px solid #e5e7eb',
-              borderRadius: '12px',
-              fontSize: '14px',
-              fontWeight: '600',
-              color: '#6b7280',
-              cursor: 'pointer',
-              transition: 'all 0.2s ease',
-            }}
-            onMouseEnter={(e) => {
-              e.currentTarget.style.background = '#f9fafb'
-              e.currentTarget.style.borderColor = '#d1d5db'
-            }}
-            onMouseLeave={(e) => {
-              e.currentTarget.style.background = 'white'
-              e.currentTarget.style.borderColor = '#e5e7eb'
-            }}
-          >
-            Cancel
-          </button>
-          <button
-            onClick={handleSave}
-            style={{
-              flex: 1,
-              padding: '12px',
-              background: `linear-gradient(135deg, ${gradientColor}, ${gradientColor}dd)`,
-              border: 'none',
-              borderRadius: '12px',
-              fontSize: '14px',
-              fontWeight: '600',
-              color: 'white',
-              cursor: 'pointer',
-              transition: 'all 0.2s ease',
-              boxShadow: '0 4px 12px rgba(0,0,0,0.15)',
-            }}
-            onMouseEnter={(e) => {
-              e.currentTarget.style.transform = 'translateY(-2px)'
-              e.currentTarget.style.boxShadow = '0 6px 16px rgba(0,0,0,0.2)'
-            }}
-            onMouseLeave={(e) => {
-              e.currentTarget.style.transform = 'translateY(0)'
-              e.currentTarget.style.boxShadow = '0 4px 12px rgba(0,0,0,0.15)'
-            }}
-          >
-            Save Changes
-          </button>
-        </div>
      </div>
    </div>
  )
--- a/apps/web/src/components/nav/PlayerTooltip.tsx
+++ b/apps/web/src/components/nav/PlayerTooltip.tsx
@@ -0,0 +1,164 @@
+import * as Tooltip from '@radix-ui/react-tooltip'
+import type React from 'react'
+
+interface PlayerTooltipProps {
+  children: React.ReactNode
+  playerName: string
+  playerColor?: string
+  isLocal?: boolean
+  createdAt?: Date | number
+  extraInfo?: string
+}
+
+/**
+ * Radix-based tooltip for displaying rich player information
+ * Shows player name, type (local/network), color, and other details
+ */
+export function PlayerTooltip({
+  children,
+  playerName,
+  playerColor,
+  isLocal = true,
+  createdAt,
+  extraInfo,
+}: PlayerTooltipProps) {
+  // Format creation time
+  const getCreatedTimeAgo = () => {
+    if (!createdAt) return null
+
+    const now = Date.now()
+    const created =
+      typeof createdAt === 'number'
+        ? createdAt
+        : createdAt instanceof Date
+          ? createdAt.getTime()
+          : 0
+    const diff = now - created
+
+    const minutes = Math.floor(diff / 60000)
+    const hours = Math.floor(diff / 3600000)
+    const days = Math.floor(diff / 86400000)
+
+    if (days > 0) return `${days}d ago`
+    if (hours > 0) return `${hours}h ago`
+    if (minutes > 0) return `${minutes}m ago`
+    return 'just now'
+  }
+
+  return (
+    <Tooltip.Provider delayDuration={200}>
+      <Tooltip.Root>
+        <Tooltip.Trigger asChild>{children}</Tooltip.Trigger>
+        <Tooltip.Portal>
+          <Tooltip.Content
+            side="bottom"
+            sideOffset={8}
+            style={{
+              background: 'linear-gradient(135deg, rgba(17, 24, 39, 0.97), rgba(31, 41, 55, 0.97))',
+              backdropFilter: 'blur(8px)',
+              borderRadius: '12px',
+              padding: '12px 16px',
+              boxShadow: '0 8px 24px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(255, 255, 255, 0.1)',
+              maxWidth: '280px',
+              zIndex: 9999,
+              animation: 'tooltipFadeIn 0.2s ease-out',
+            }}
+          >
+            {/* Player name with color accent */}
+            <div
+              style={{
+                display: 'flex',
+                alignItems: 'center',
+                gap: '8px',
+                marginBottom: '8px',
+              }}
+            >
+              {playerColor && (
+                <div
+                  style={{
+                    width: '12px',
+                    height: '12px',
+                    borderRadius: '50%',
+                    background: playerColor,
+                    boxShadow: `0 0 8px ${playerColor}50`,
+                    flexShrink: 0,
+                  }}
+                />
+              )}
+              <div
+                style={{
+                  fontSize: '15px',
+                  fontWeight: '600',
+                  color: 'white',
+                  lineHeight: 1.3,
+                }}
+              >
+                {playerName}
+              </div>
+            </div>
+
+            {/* Player type badge */}
+            <div
+              style={{
+                display: 'inline-flex',
+                alignItems: 'center',
+                gap: '4px',
+                padding: '4px 8px',
+                borderRadius: '6px',
+                background: isLocal
+                  ? 'rgba(16, 185, 129, 0.15)'
+                  : 'linear-gradient(135deg, rgba(59, 130, 246, 0.15), rgba(147, 51, 234, 0.15))',
+                border: `1px solid ${isLocal ? 'rgba(16, 185, 129, 0.3)' : 'rgba(147, 51, 234, 0.3)'}`,
+                fontSize: '11px',
+                fontWeight: '600',
+                color: isLocal ? 'rgba(167, 243, 208, 1)' : 'rgba(196, 181, 253, 1)',
+                marginBottom: extraInfo || createdAt ? '8px' : 0,
+              }}
+            >
+              <span style={{ fontSize: '10px' }}>{isLocal ? '●' : '📡'}</span>
+              {isLocal ? 'Your Player' : 'Network Player'}
+            </div>
+
+            {/* Additional info */}
+            {(extraInfo || createdAt) && (
+              <div
+                style={{
+                  fontSize: '12px',
+                  color: 'rgba(209, 213, 219, 0.9)',
+                  lineHeight: 1.4,
+                  marginTop: '4px',
+                }}
+              >
+                {extraInfo && <div>{extraInfo}</div>}
+                {createdAt && <div style={{ opacity: 0.7 }}>Joined {getCreatedTimeAgo()}</div>}
+              </div>
+            )}
+
+            <Tooltip.Arrow
+              style={{
+                fill: 'rgba(17, 24, 39, 0.97)',
+              }}
+            />
+          </Tooltip.Content>
+        </Tooltip.Portal>
+      </Tooltip.Root>
+
+      <style
+        dangerouslySetInnerHTML={{
+          __html: `
+            @keyframes tooltipFadeIn {
+              from {
+                opacity: 0;
+                transform: translateY(-4px);
+              }
+              to {
+                opacity: 1;
+                transform: translateY(0);
+              }
+            }
+          `,
+        }}
+      />
+    </Tooltip.Provider>
+  )
+}
--- a/apps/web/src/contexts/GameModeContext.tsx
+++ b/apps/web/src/contexts/GameModeContext.tsx
@@ -68,7 +68,7 @@ export function GameModeProvider({ children }: { children: ReactNode }) {
  const { mutate: createPlayer } = useCreatePlayer()
  const { mutate: updatePlayerMutation } = useUpdatePlayer()
  const { mutate: deletePlayer } = useDeletePlayer()
-  const { roomData } = useRoomData()
+  const { roomData, notifyRoomOfPlayerUpdate } = useRoomData()
  const { data: viewerId } = useViewerId()

  const [isInitialized, setIsInitialized] = useState(false)
@@ -167,14 +167,27 @@ export function GameModeProvider({ children }: { children: ReactNode }) {
      isActive: playerData?.isActive ?? false,
    }

-    createPlayer(newPlayer)
+    createPlayer(newPlayer, {
+      onSuccess: () => {
+        // Notify room members if in a room
+        notifyRoomOfPlayerUpdate()
+      },
+    })
  }

  const updatePlayer = (id: string, updates: Partial<Player>) => {
    const player = players.get(id)
    // Only allow updating local players
    if (player?.isLocal) {
-      updatePlayerMutation({ id, updates })
+      updatePlayerMutation(
+        { id, updates },
+        {
+          onSuccess: () => {
+            // Notify room members if in a room
+            notifyRoomOfPlayerUpdate()
+          },
+        }
+      )
    } else {
      console.warn('[GameModeContext] Cannot update remote player:', id)
    }
@@ -184,7 +197,12 @@ export function GameModeProvider({ children }: { children: ReactNode }) {
    const player = players.get(id)
    // Only allow removing local players
    if (player?.isLocal) {
-      deletePlayer(id)
+      deletePlayer(id, {
+        onSuccess: () => {
+          // Notify room members if in a room
+          notifyRoomOfPlayerUpdate()
+        },
+      })
    } else {
      console.warn('[GameModeContext] Cannot remove remote player:', id)
    }
@@ -194,7 +212,15 @@ export function GameModeProvider({ children }: { children: ReactNode }) {
    const player = players.get(id)
    // Only allow changing active status of local players
    if (player?.isLocal) {
-      updatePlayerMutation({ id, updates: { isActive: active } })
+      updatePlayerMutation(
+        { id, updates: { isActive: active } },
+        {
+          onSuccess: () => {
+            // Notify room members if in a room
+            notifyRoomOfPlayerUpdate()
+          },
+        }
+      )
    } else {
      console.warn('[GameModeContext] Cannot change active status of remote player:', id)
    }
@@ -227,6 +253,11 @@ export function GameModeProvider({ children }: { children: ReactNode }) {
        isActive: index === 0,
      })
    })
+
+    // Notify room members after reset (slight delay to ensure mutations complete)
+    setTimeout(() => {
+      notifyRoomOfPlayerUpdate()
+    }, 100)
  }

  const activePlayerCount = activePlayers.size
--- a/apps/web/src/db/index.js
+++ b/apps/web/src/db/index.js
@@ -0,0 +1,80 @@
+"use strict";
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    var desc = Object.getOwnPropertyDescriptor(m, k);
+    if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
+      desc = { enumerable: true, get: function() { return m[k]; } };
+    }
+    Object.defineProperty(o, k2, desc);
+}) : (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    o[k2] = m[k];
+}));
+var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
+    Object.defineProperty(o, "default", { enumerable: true, value: v });
+}) : function(o, v) {
+    o["default"] = v;
+});
+var __importStar = (this && this.__importStar) || (function () {
+    var ownKeys = function(o) {
+        ownKeys = Object.getOwnPropertyNames || function (o) {
+            var ar = [];
+            for (var k in o) if (Object.prototype.hasOwnProperty.call(o, k)) ar[ar.length] = k;
+            return ar;
+        };
+        return ownKeys(o);
+    };
+    return function (mod) {
+        if (mod && mod.__esModule) return mod;
+        var result = {};
+        if (mod != null) for (var k = ownKeys(mod), i = 0; i < k.length; i++) if (k[i] !== "default") __createBinding(result, mod, k[i]);
+        __setModuleDefault(result, mod);
+        return result;
+    };
+})();
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.schema = exports.db = void 0;
+const better_sqlite3_1 = __importDefault(require("better-sqlite3"));
+const better_sqlite3_2 = require("drizzle-orm/better-sqlite3");
+const schema = __importStar(require("./schema"));
+exports.schema = schema;
+/**
+ * Database connection and client
+ *
+ * Creates a singleton SQLite connection with Drizzle ORM.
+ * Enables foreign key constraints (required for cascading deletes).
+ *
+ * IMPORTANT: The database connection is lazy-loaded to avoid accessing
+ * the database at module import time, which would cause build failures
+ * when the database doesn't exist (e.g., in CI/CD environments).
+ */
+const databaseUrl = process.env.DATABASE_URL || './data/sqlite.db';
+let _sqlite = null;
+let _db = null;
+/**
+ * Get the database connection (lazy-loaded singleton)
+ * Only creates the connection when first accessed at runtime
+ */
+function getDb() {
+    if (!_db) {
+        _sqlite = new better_sqlite3_1.default(databaseUrl);
+        // Enable foreign keys (SQLite requires explicit enable)
+        _sqlite.pragma('foreign_keys = ON');
+        // Enable WAL mode for better concurrency
+        _sqlite.pragma('journal_mode = WAL');
+        _db = (0, better_sqlite3_2.drizzle)(_sqlite, { schema });
+    }
+    return _db;
+}
+/**
+ * Database client instance
+ * Uses a Proxy to lazy-load the connection on first access
+ */
+exports.db = new Proxy({}, {
+    get(_target, prop) {
+        return getDb()[prop];
+    },
+});
--- a/apps/web/src/db/migrate.js
+++ b/apps/web/src/db/migrate.js
@@ -0,0 +1,22 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const migrator_1 = require("drizzle-orm/better-sqlite3/migrator");
+const index_1 = require("./index");
+/**
+ * Migration runner
+ *
+ * Runs all pending migrations in the drizzle/ folder.
+ * Safe to run multiple times (migrations are idempotent).
+ *
+ * Usage: pnpm db:migrate
+ */
+try {
+    console.log('🔄 Running migrations...');
+    (0, migrator_1.migrate)(index_1.db, { migrationsFolder: './drizzle' });
+    console.log('✅ Migrations complete');
+    process.exit(0);
+}
+catch (error) {
+    console.error('❌ Migration failed:', error);
+    process.exit(1);
+}
--- a/apps/web/src/db/schema/abacus-settings.js
+++ b/apps/web/src/db/schema/abacus-settings.js
@@ -0,0 +1,53 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.abacusSettings = void 0;
+const sqlite_core_1 = require("drizzle-orm/sqlite-core");
+const users_1 = require("./users");
+/**
+ * Abacus display settings table - UI preferences per user
+ *
+ * One-to-one with users table. Stores abacus display configuration.
+ * Deleted when user is deleted (cascade).
+ */
+exports.abacusSettings = (0, sqlite_core_1.sqliteTable)('abacus_settings', {
+    /** Primary key and foreign key to users table */
+    userId: (0, sqlite_core_1.text)('user_id')
+        .primaryKey()
+        .references(() => users_1.users.id, { onDelete: 'cascade' }),
+    /** Color scheme for beads */
+    colorScheme: (0, sqlite_core_1.text)('color_scheme', {
+        enum: ['monochrome', 'place-value', 'heaven-earth', 'alternating'],
+    })
+        .notNull()
+        .default('place-value'),
+    /** Bead shape */
+    beadShape: (0, sqlite_core_1.text)('bead_shape', {
+        enum: ['diamond', 'circle', 'square'],
+    })
+        .notNull()
+        .default('diamond'),
+    /** Color palette */
+    colorPalette: (0, sqlite_core_1.text)('color_palette', {
+        enum: ['default', 'colorblind', 'mnemonic', 'grayscale', 'nature'],
+    })
+        .notNull()
+        .default('default'),
+    /** Hide inactive beads */
+    hideInactiveBeads: (0, sqlite_core_1.integer)('hide_inactive_beads', { mode: 'boolean' }).notNull().default(false),
+    /** Color numerals based on place value */
+    coloredNumerals: (0, sqlite_core_1.integer)('colored_numerals', { mode: 'boolean' }).notNull().default(false),
+    /** Scale factor for abacus size */
+    scaleFactor: (0, sqlite_core_1.real)('scale_factor').notNull().default(1.0),
+    /** Show numbers below abacus */
+    showNumbers: (0, sqlite_core_1.integer)('show_numbers', { mode: 'boolean' }).notNull().default(true),
+    /** Enable animations */
+    animated: (0, sqlite_core_1.integer)('animated', { mode: 'boolean' }).notNull().default(true),
+    /** Enable interaction */
+    interactive: (0, sqlite_core_1.integer)('interactive', { mode: 'boolean' }).notNull().default(false),
+    /** Enable gesture controls */
+    gestures: (0, sqlite_core_1.integer)('gestures', { mode: 'boolean' }).notNull().default(false),
+    /** Enable sound effects */
+    soundEnabled: (0, sqlite_core_1.integer)('sound_enabled', { mode: 'boolean' }).notNull().default(true),
+    /** Sound volume (0.0 - 1.0) */
+    soundVolume: (0, sqlite_core_1.real)('sound_volume').notNull().default(0.8),
+});
--- a/apps/web/src/db/schema/arcade-rooms.js
+++ b/apps/web/src/db/schema/arcade-rooms.js
@@ -0,0 +1,39 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.arcadeRooms = void 0;
+const cuid2_1 = require("@paralleldrive/cuid2");
+const sqlite_core_1 = require("drizzle-orm/sqlite-core");
+exports.arcadeRooms = (0, sqlite_core_1.sqliteTable)('arcade_rooms', {
+    id: (0, sqlite_core_1.text)('id')
+        .primaryKey()
+        .$defaultFn(() => (0, cuid2_1.createId)()),
+    // Room identity
+    code: (0, sqlite_core_1.text)('code', { length: 6 }).notNull().unique(), // e.g., "ABC123"
+    name: (0, sqlite_core_1.text)('name', { length: 50 }).notNull(),
+    // Creator info
+    createdBy: (0, sqlite_core_1.text)('created_by').notNull(), // User/guest ID
+    creatorName: (0, sqlite_core_1.text)('creator_name', { length: 50 }).notNull(),
+    createdAt: (0, sqlite_core_1.integer)('created_at', { mode: 'timestamp' })
+        .notNull()
+        .$defaultFn(() => new Date()),
+    // Lifecycle
+    lastActivity: (0, sqlite_core_1.integer)('last_activity', { mode: 'timestamp' })
+        .notNull()
+        .$defaultFn(() => new Date()),
+    ttlMinutes: (0, sqlite_core_1.integer)('ttl_minutes').notNull().default(60), // Time to live
+    isLocked: (0, sqlite_core_1.integer)('is_locked', { mode: 'boolean' }).notNull().default(false),
+    // Game configuration
+    gameName: (0, sqlite_core_1.text)('game_name', {
+        enum: ['matching', 'memory-quiz', 'complement-race'],
+    }).notNull(),
+    gameConfig: (0, sqlite_core_1.text)('game_config', { mode: 'json' }).notNull(), // Game-specific settings
+    // Current state
+    status: (0, sqlite_core_1.text)('status', {
+        enum: ['lobby', 'playing', 'finished'],
+    })
+        .notNull()
+        .default('lobby'),
+    currentSessionId: (0, sqlite_core_1.text)('current_session_id'), // FK to arcade_sessions (nullable)
+    // Metadata
+    totalGamesPlayed: (0, sqlite_core_1.integer)('total_games_played').notNull().default(0),
+});
--- a/apps/web/src/db/schema/arcade-sessions.js
+++ b/apps/web/src/db/schema/arcade-sessions.js
@@ -0,0 +1,30 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.arcadeSessions = void 0;
+const sqlite_core_1 = require("drizzle-orm/sqlite-core");
+const arcade_rooms_1 = require("./arcade-rooms");
+const users_1 = require("./users");
+exports.arcadeSessions = (0, sqlite_core_1.sqliteTable)('arcade_sessions', {
+    userId: (0, sqlite_core_1.text)('user_id')
+        .primaryKey()
+        .references(() => users_1.users.id, { onDelete: 'cascade' }),
+    // Session metadata
+    currentGame: (0, sqlite_core_1.text)('current_game', {
+        enum: ['matching', 'memory-quiz', 'complement-race'],
+    }).notNull(),
+    gameUrl: (0, sqlite_core_1.text)('game_url').notNull(), // e.g., '/arcade/matching'
+    // Game state (JSON blob)
+    gameState: (0, sqlite_core_1.text)('game_state', { mode: 'json' }).notNull(),
+    // Active players snapshot (for quick access)
+    activePlayers: (0, sqlite_core_1.text)('active_players', { mode: 'json' }).notNull(),
+    // Room association (null for solo play)
+    roomId: (0, sqlite_core_1.text)('room_id').references(() => arcade_rooms_1.arcadeRooms.id, { onDelete: 'set null' }),
+    // Timing & TTL
+    startedAt: (0, sqlite_core_1.integer)('started_at', { mode: 'timestamp' }).notNull(),
+    lastActivityAt: (0, sqlite_core_1.integer)('last_activity_at', { mode: 'timestamp' }).notNull(),
+    expiresAt: (0, sqlite_core_1.integer)('expires_at', { mode: 'timestamp' }).notNull(), // TTL-based
+    // Status
+    isActive: (0, sqlite_core_1.integer)('is_active', { mode: 'boolean' }).notNull().default(true),
+    // Version for optimistic locking
+    version: (0, sqlite_core_1.integer)('version').notNull().default(1),
+});
--- a/apps/web/src/db/schema/index.js
+++ b/apps/web/src/db/schema/index.js
@@ -0,0 +1,29 @@
+"use strict";
+/**
+ * Database schema exports
+ *
+ * This is the single source of truth for the database schema.
+ * All tables, relations, and types are exported from here.
+ */
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    var desc = Object.getOwnPropertyDescriptor(m, k);
+    if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
+      desc = { enumerable: true, get: function() { return m[k]; } };
+    }
+    Object.defineProperty(o, k2, desc);
+}) : (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    o[k2] = m[k];
+}));
+var __exportStar = (this && this.__exportStar) || function(m, exports) {
+    for (var p in m) if (p !== "default" && !Object.prototype.hasOwnProperty.call(exports, p)) __createBinding(exports, m, p);
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+__exportStar(require("./abacus-settings"), exports);
+__exportStar(require("./arcade-rooms"), exports);
+__exportStar(require("./arcade-sessions"), exports);
+__exportStar(require("./players"), exports);
+__exportStar(require("./room-members"), exports);
+__exportStar(require("./user-stats"), exports);
+__exportStar(require("./users"), exports);
--- a/apps/web/src/db/schema/players.js
+++ b/apps/web/src/db/schema/players.js
@@ -0,0 +1,36 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.players = void 0;
+const cuid2_1 = require("@paralleldrive/cuid2");
+const sqlite_core_1 = require("drizzle-orm/sqlite-core");
+const users_1 = require("./users");
+/**
+ * Players table - user-created player profiles for games
+ *
+ * Each user can have multiple players (for multi-player modes).
+ * Players are scoped to a user and deleted when user is deleted.
+ */
+exports.players = (0, sqlite_core_1.sqliteTable)('players', {
+    id: (0, sqlite_core_1.text)('id')
+        .primaryKey()
+        .$defaultFn(() => (0, cuid2_1.createId)()),
+    /** Foreign key to users table - cascades on delete */
+    userId: (0, sqlite_core_1.text)('user_id')
+        .notNull()
+        .references(() => users_1.users.id, { onDelete: 'cascade' }),
+    /** Player display name */
+    name: (0, sqlite_core_1.text)('name').notNull(),
+    /** Player emoji avatar */
+    emoji: (0, sqlite_core_1.text)('emoji').notNull(),
+    /** Player color (hex) for UI theming */
+    color: (0, sqlite_core_1.text)('color').notNull(),
+    /** Whether this player is currently active in games */
+    isActive: (0, sqlite_core_1.integer)('is_active', { mode: 'boolean' }).notNull().default(false),
+    /** When this player was created */
+    createdAt: (0, sqlite_core_1.integer)('created_at', { mode: 'timestamp' })
+        .notNull()
+        .$defaultFn(() => new Date()),
+}, (table) => ({
+    /** Index for fast lookups by userId */
+    userIdIdx: (0, sqlite_core_1.index)('players_user_id_idx').on(table.userId),
+}));
--- a/apps/web/src/db/schema/room-members.js
+++ b/apps/web/src/db/schema/room-members.js
@@ -0,0 +1,27 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.roomMembers = void 0;
+const cuid2_1 = require("@paralleldrive/cuid2");
+const sqlite_core_1 = require("drizzle-orm/sqlite-core");
+const arcade_rooms_1 = require("./arcade-rooms");
+exports.roomMembers = (0, sqlite_core_1.sqliteTable)('room_members', {
+    id: (0, sqlite_core_1.text)('id')
+        .primaryKey()
+        .$defaultFn(() => (0, cuid2_1.createId)()),
+    roomId: (0, sqlite_core_1.text)('room_id')
+        .notNull()
+        .references(() => arcade_rooms_1.arcadeRooms.id, { onDelete: 'cascade' }),
+    userId: (0, sqlite_core_1.text)('user_id').notNull(), // User/guest ID - UNIQUE: one room per user (enforced by index below)
+    displayName: (0, sqlite_core_1.text)('display_name', { length: 50 }).notNull(),
+    isCreator: (0, sqlite_core_1.integer)('is_creator', { mode: 'boolean' }).notNull().default(false),
+    joinedAt: (0, sqlite_core_1.integer)('joined_at', { mode: 'timestamp' })
+        .notNull()
+        .$defaultFn(() => new Date()),
+    lastSeen: (0, sqlite_core_1.integer)('last_seen', { mode: 'timestamp' })
+        .notNull()
+        .$defaultFn(() => new Date()),
+    isOnline: (0, sqlite_core_1.integer)('is_online', { mode: 'boolean' }).notNull().default(true),
+}, (table) => ({
+    // Explicit unique index for clarity and database-level enforcement
+    userIdIdx: (0, sqlite_core_1.uniqueIndex)('idx_room_members_user_id_unique').on(table.userId),
+}));
--- a/apps/web/src/db/schema/user-stats.js
+++ b/apps/web/src/db/schema/user-stats.js
@@ -0,0 +1,29 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.userStats = void 0;
+const sqlite_core_1 = require("drizzle-orm/sqlite-core");
+const users_1 = require("./users");
+/**
+ * User stats table - game statistics per user
+ *
+ * One-to-one with users table. Tracks aggregate game performance.
+ * Deleted when user is deleted (cascade).
+ */
+exports.userStats = (0, sqlite_core_1.sqliteTable)('user_stats', {
+    /** Primary key and foreign key to users table */
+    userId: (0, sqlite_core_1.text)('user_id')
+        .primaryKey()
+        .references(() => users_1.users.id, { onDelete: 'cascade' }),
+    /** Total number of games played */
+    gamesPlayed: (0, sqlite_core_1.integer)('games_played').notNull().default(0),
+    /** Total number of games won */
+    totalWins: (0, sqlite_core_1.integer)('total_wins').notNull().default(0),
+    /** User's most-played game type */
+    favoriteGameType: (0, sqlite_core_1.text)('favorite_game_type', {
+        enum: ['abacus-numeral', 'complement-pairs'],
+    }),
+    /** Best completion time in milliseconds */
+    bestTime: (0, sqlite_core_1.integer)('best_time'),
+    /** Highest accuracy percentage (0.0 - 1.0) */
+    highestAccuracy: (0, sqlite_core_1.real)('highest_accuracy').notNull().default(0),
+});
--- a/apps/web/src/db/schema/users.js
+++ b/apps/web/src/db/schema/users.js
@@ -0,0 +1,28 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.users = void 0;
+const cuid2_1 = require("@paralleldrive/cuid2");
+const sqlite_core_1 = require("drizzle-orm/sqlite-core");
+/**
+ * Users table - stores both guest and authenticated users
+ *
+ * Guest users are created automatically on first visit via middleware.
+ * They can upgrade to full accounts later while preserving their data.
+ */
+exports.users = (0, sqlite_core_1.sqliteTable)('users', {
+    id: (0, sqlite_core_1.text)('id')
+        .primaryKey()
+        .$defaultFn(() => (0, cuid2_1.createId)()),
+    /** Stable guest ID from HttpOnly cookie - unique per browser session */
+    guestId: (0, sqlite_core_1.text)('guest_id').notNull().unique(),
+    /** When this user record was created */
+    createdAt: (0, sqlite_core_1.integer)('created_at', { mode: 'timestamp' })
+        .notNull()
+        .$defaultFn(() => new Date()),
+    /** When guest upgraded to full account (null for guests) */
+    upgradedAt: (0, sqlite_core_1.integer)('upgraded_at', { mode: 'timestamp' }),
+    /** Email (only set after upgrade) */
+    email: (0, sqlite_core_1.text)('email').unique(),
+    /** Display name (only set after upgrade) */
+    name: (0, sqlite_core_1.text)('name'),
+});
--- a/apps/web/src/hooks/tests/useArcadeGuard.test.ts
+++ b/apps/web/src/hooks/tests/useArcadeGuard.test.ts
@@ -65,9 +65,11 @@ describe('useArcadeGuard', () => {

  it('should fetch active session on mount', async () => {
    const mockSession = {
-      gameUrl: '/arcade/matching',
-      currentGame: 'matching',
-      gameState: {},
+      session: {
+        gameUrl: '/arcade/matching',
+        currentGame: 'matching',
+        gameState: {},
+      },
    }

    ;(global.fetch as any).mockResolvedValue({
@@ -91,9 +93,11 @@ describe('useArcadeGuard', () => {

  it('should redirect to active session if on different page', async () => {
    const mockSession = {
-      gameUrl: '/arcade/memory-quiz',
-      currentGame: 'memory-quiz',
-      gameState: {},
+      session: {
+        gameUrl: '/arcade/memory-quiz',
+        currentGame: 'memory-quiz',
+        gameState: {},
+      },
    }

    ;(global.fetch as any).mockResolvedValue({
@@ -112,9 +116,11 @@ describe('useArcadeGuard', () => {

  it('should NOT redirect if already on active session page', async () => {
    const mockSession = {
-      gameUrl: '/arcade/matching',
-      currentGame: 'matching',
-      gameState: {},
+      session: {
+        gameUrl: '/arcade/matching',
+        currentGame: 'matching',
+        gameState: {},
+      },
    }

    ;(global.fetch as any).mockResolvedValue({
@@ -152,9 +158,11 @@ describe('useArcadeGuard', () => {
  it('should call onRedirect callback when redirecting', async () => {
    const onRedirect = vi.fn()
    const mockSession = {
-      gameUrl: '/arcade/memory-quiz',
-      currentGame: 'memory-quiz',
-      gameState: {},
+      session: {
+        gameUrl: '/arcade/memory-quiz',
+        currentGame: 'memory-quiz',
+        gameState: {},
+      },
    }

    ;(global.fetch as any).mockResolvedValue({
@@ -248,9 +256,11 @@ describe('useArcadeGuard', () => {
    })

    const mockSession = {
-      gameUrl: '/arcade/matching',
-      currentGame: 'matching',
-      gameState: {},
+      session: {
+        gameUrl: '/arcade/matching',
+        currentGame: 'matching',
+        gameState: {},
+      },
    }

    ;(global.fetch as any).mockResolvedValue({
@@ -285,4 +295,136 @@ describe('useArcadeGuard', () => {
    // Should not crash, just set loading to false
    expect(result.current.hasActiveSession).toBe(false)
  })
+
+  describe('enabled flag behavior', () => {
+    it('should NOT redirect from HTTP check when enabled=false', async () => {
+      const mockSession = {
+        session: {
+          gameUrl: '/arcade/memory-quiz',
+          currentGame: 'memory-quiz',
+          gameState: {},
+        },
+      }
+
+      ;(global.fetch as any).mockResolvedValue({
+        ok: true,
+        json: async () => mockSession,
+      })
+
+      vi.spyOn(nextNavigation, 'usePathname').mockReturnValue('/arcade-rooms')
+
+      renderHook(() => useArcadeGuard({ enabled: false }))
+
+      await waitFor(() => {
+        expect(global.fetch).not.toHaveBeenCalled()
+      })
+
+      // Should NOT redirect
+      expect(mockRouter.push).not.toHaveBeenCalled()
+    })
+
+    it('should NOT redirect from WebSocket when enabled=false', async () => {
+      let onSessionStateCallback: ((data: any) => void) | null = null
+
+      vi.spyOn(arcadeSocket, 'useArcadeSocket').mockImplementation((events) => {
+        onSessionStateCallback = events?.onSessionState || null
+        return mockUseArcadeSocket
+      })
+
+      ;(global.fetch as any).mockResolvedValue({
+        ok: false,
+        status: 404,
+      })
+
+      vi.spyOn(nextNavigation, 'usePathname').mockReturnValue('/arcade-rooms')
+
+      const { result } = renderHook(() => useArcadeGuard({ enabled: false }))
+
+      await waitFor(() => {
+        expect(result.current.loading).toBe(false)
+      })
+
+      // Simulate session-state event from WebSocket
+      onSessionStateCallback?.({
+        gameUrl: '/arcade/room',
+        currentGame: 'matching',
+        gameState: {},
+        activePlayers: [1],
+        version: 1,
+      })
+
+      await waitFor(() => {
+        // Should track the session
+        expect(result.current.hasActiveSession).toBe(true)
+        expect(result.current.activeSession).toEqual({
+          gameUrl: '/arcade/room',
+          currentGame: 'matching',
+        })
+      })
+
+      // But should NOT redirect since enabled=false
+      expect(mockRouter.push).not.toHaveBeenCalled()
+    })
+
+    it('should STILL redirect from WebSocket when enabled=true', async () => {
+      let onSessionStateCallback: ((data: any) => void) | null = null
+
+      vi.spyOn(arcadeSocket, 'useArcadeSocket').mockImplementation((events) => {
+        onSessionStateCallback = events?.onSessionState || null
+        return mockUseArcadeSocket
+      })
+
+      ;(global.fetch as any).mockResolvedValue({
+        ok: false,
+        status: 404,
+      })
+
+      vi.spyOn(nextNavigation, 'usePathname').mockReturnValue('/arcade-rooms')
+
+      renderHook(() => useArcadeGuard({ enabled: true }))
+
+      await waitFor(() => {
+        expect(mockUseArcadeSocket.joinSession).toHaveBeenCalled()
+      })
+
+      // Simulate session-state event from WebSocket
+      onSessionStateCallback?.({
+        gameUrl: '/arcade/room',
+        currentGame: 'matching',
+        gameState: {},
+        activePlayers: [1],
+        version: 1,
+      })
+
+      // Should redirect when enabled=true
+      await waitFor(() => {
+        expect(mockRouter.push).toHaveBeenCalledWith('/arcade/room')
+      })
+    })
+
+    it('should track session state even when enabled=false', async () => {
+      const mockSession = {
+        session: {
+          gameUrl: '/arcade/room',
+          currentGame: 'matching',
+          gameState: {},
+        },
+      }
+
+      ;(global.fetch as any).mockResolvedValue({
+        ok: true,
+        json: async () => mockSession,
+      })
+
+      const { result } = renderHook(() => useArcadeGuard({ enabled: false }))
+
+      await waitFor(() => {
+        expect(result.current.loading).toBe(false)
+      })
+
+      // Should still provide session info even without redirects
+      expect(result.current.hasActiveSession).toBe(false) // No fetch happened
+      expect(result.current.activeSession).toBe(null)
+    })
+  })
 })
--- a/apps/web/src/hooks/useArcadeGuard.ts
+++ b/apps/web/src/hooks/useArcadeGuard.ts
@@ -73,11 +73,14 @@ export function useArcadeGuard(options: UseArcadeGuardOptions = {}): UseArcadeGu
        currentGame: data.currentGame,
      })

-      // Redirect if we're not already on the active game page
-      if (pathname !== data.gameUrl) {
+      // Redirect if we're not already on the active game page (only if enabled)
+      const isAlreadyAtTarget = pathname === data.gameUrl
+      if (enabled && !isAlreadyAtTarget) {
        console.log('[ArcadeGuard] Redirecting to active session:', data.gameUrl)
        onRedirect?.(data.gameUrl)
        router.push(data.gameUrl)
+      } else if (isAlreadyAtTarget) {
+        console.log('[ArcadeGuard] Already at target URL, no redirect needed')
      }
    },

@@ -126,11 +129,14 @@ export function useArcadeGuard(options: UseArcadeGuardOptions = {}): UseArcadeGu
            currentGame: session.currentGame,
          })

-          // Redirect if we're not already on the active game page
-          if (pathname !== session.gameUrl) {
+          // Redirect if we're not already on the active game page (only if enabled)
+          const isAlreadyAtTarget = pathname === session.gameUrl
+          if (enabled && !isAlreadyAtTarget) {
            console.log('[ArcadeGuard] Redirecting to active session:', session.gameUrl)
            onRedirect?.(session.gameUrl)
            router.push(session.gameUrl)
+          } else if (isAlreadyAtTarget) {
+            console.log('[ArcadeGuard] Already at target URL, no redirect needed')
          }
        } else if (response.status === 404) {
          // No active session
--- a/apps/web/src/hooks/useArcadeRedirect.ts
+++ b/apps/web/src/hooks/useArcadeRedirect.ts
@@ -71,10 +71,13 @@ export function useArcadeRedirect(options: UseArcadeRedirectOptions = {}): UseAr
      // Determine if we need to redirect
      const isArcadeLobby = currentGame === null || currentGame === undefined
      const isWrongGame = currentGame && currentGame !== data.currentGame
+      const isAlreadyAtTarget = _pathname === data.gameUrl

-      if (isArcadeLobby || isWrongGame) {
+      if ((isArcadeLobby || isWrongGame) && !isAlreadyAtTarget) {
        console.log('[ArcadeRedirect] Redirecting to active game:', data.gameUrl)
        router.push(data.gameUrl)
+      } else if (isAlreadyAtTarget) {
+        console.log('[ArcadeRedirect] Already at target URL, no redirect needed')
      }
    },

--- a/apps/web/src/hooks/useArcadeSession.ts
+++ b/apps/web/src/hooks/useArcadeSession.ts
@@ -12,6 +12,12 @@ export interface UseArcadeSessionOptions<TState> extends UseOptimisticGameStateO
   */
  userId: string

+  /**
+   * Room ID for multi-user sync (optional)
+   * If provided, game state will sync across all users in the room
+   */
+  roomId?: string
+
  /**
   * Auto-join session on mount
   * @default true
@@ -42,8 +48,9 @@ export interface UseArcadeSessionReturn<TState> {

  /**
   * Send a game move (applies optimistically and sends to server)
+   * Note: playerId must be provided by caller (not omitted)
   */
-  sendMove: (move: Omit<GameMove, 'playerId' | 'timestamp'>) => void
+  sendMove: (move: Omit<GameMove, 'timestamp'>) => void

  /**
   * Exit the arcade session
@@ -76,7 +83,7 @@ export interface UseArcadeSessionReturn<TState> {
 export function useArcadeSession<TState>(
  options: UseArcadeSessionOptions<TState>
 ): UseArcadeSessionReturn<TState> {
-  const { userId, autoJoin = true, ...optimisticOptions } = options
+  const { userId, roomId, autoJoin = true, ...optimisticOptions } = options

  // Optimistic state management
  const optimistic = useOptimisticGameState<TState>(optimisticOptions)
@@ -122,9 +129,9 @@ export function useArcadeSession<TState>(
  // Auto-join session when connected
  useEffect(() => {
    if (connected && autoJoin && userId) {
-      joinSession(userId)
+      joinSession(userId, roomId)
    }
-  }, [connected, autoJoin, userId, joinSession])
+  }, [connected, autoJoin, userId, roomId, joinSession])

  // Send move with optimistic update
  const sendMove = useCallback(
@@ -143,10 +150,10 @@ export function useArcadeSession<TState>(
      // Apply optimistically
      optimistic.applyOptimisticMove(fullMove)

-      // Send to server
-      socketSendMove(userId, fullMove)
+      // Send to server with roomId for room-based games
+      socketSendMove(userId, fullMove, roomId)
    },
-    [userId, optimistic, socketSendMove]
+    [userId, roomId, optimistic, socketSendMove]
  )

  const exitSession = useCallback(() => {
@@ -156,9 +163,9 @@ export function useArcadeSession<TState>(

  const refresh = useCallback(() => {
    if (connected && userId) {
-      joinSession(userId)
+      joinSession(userId, roomId)
    }
-  }, [connected, userId, joinSession])
+  }, [connected, userId, roomId, joinSession])

  return {
    state: optimistic.state,
--- a/apps/web/src/hooks/useArcadeSocket.ts
+++ b/apps/web/src/hooks/useArcadeSocket.ts
@@ -20,8 +20,8 @@ export interface ArcadeSocketEvents {
 export interface UseArcadeSocketReturn {
  socket: Socket | null
  connected: boolean
-  joinSession: (userId: string) => void
-  sendMove: (userId: string, move: GameMove) => void
+  joinSession: (userId: string, roomId?: string) => void
+  sendMove: (userId: string, move: GameMove, roomId?: string) => void
  exitSession: (userId: string) => void
  pingSession: (userId: string) => void
 }
@@ -103,24 +103,28 @@ export function useArcadeSocket(events: ArcadeSocketEvents = {}): UseArcadeSocke
  }, [])

  const joinSession = useCallback(
-    (userId: string) => {
+    (userId: string, roomId?: string) => {
      if (!socket) {
        console.warn('[ArcadeSocket] Cannot join session - socket not connected')
        return
      }
-      console.log('[ArcadeSocket] Joining session for user:', userId)
-      socket.emit('join-arcade-session', { userId })
+      console.log(
+        '[ArcadeSocket] Joining session for user:',
+        userId,
+        roomId ? `in room ${roomId}` : '(solo)'
+      )
+      socket.emit('join-arcade-session', { userId, roomId })
    },
    [socket]
  )

  const sendMove = useCallback(
-    (userId: string, move: GameMove) => {
+    (userId: string, move: GameMove, roomId?: string) => {
      if (!socket) {
        console.warn('[ArcadeSocket] Cannot send move - socket not connected')
        return
      }
-      const payload = { userId, move }
+      const payload = { userId, move, roomId }
      console.log(
        '[ArcadeSocket] Sending game-move event with payload:',
        JSON.stringify(payload, null, 2)
--- a/apps/web/src/hooks/useRoomData.ts
+++ b/apps/web/src/hooks/useRoomData.ts
@@ -40,25 +40,21 @@ export function useRoomData() {
  // Fetch the user's current room
  useEffect(() => {
    if (!userId) {
-      console.log('[useRoomData] No userId, clearing room data')
      setRoomData(null)
      setHasAttemptedFetch(false)
      return
    }

-    console.log('[useRoomData] Fetching current room for user:', userId)
    setIsLoading(true)
    setHasAttemptedFetch(false)

    // Fetch current room data
    fetch('/api/arcade/rooms/current')
      .then((res) => {
-        console.log('[useRoomData] API response status:', res.status)
        if (!res.ok) throw new Error('Failed to fetch current room')
        return res.json()
      })
      .then((data) => {
-        console.log('[useRoomData] API response data:', data)
        if (data.room) {
          const roomData = {
            id: data.room.id,
@@ -68,10 +64,8 @@ export function useRoomData() {
            members: data.members || [],
            memberPlayers: data.memberPlayers || {},
          }
-          console.log('[useRoomData] Setting room data:', roomData)
          setRoomData(roomData)
        } else {
-          console.log('[useRoomData] No room in response, clearing room data')
          setRoomData(null)
        }
        setIsLoading(false)
@@ -98,13 +92,12 @@ export function useRoomData() {
    const sock = io({ path: '/api/socket' })

    sock.on('connect', () => {
-      console.log('[useRoomData] Socket connected, joining room:', roomData.id)
      // Join the room to receive updates
      sock.emit('join-room', { roomId: roomData.id, userId })
    })

    sock.on('disconnect', () => {
-      console.log('[useRoomData] Socket disconnected')
+      // Socket disconnected
    })

    setSocket(sock)
@@ -127,7 +120,6 @@ export function useRoomData() {
      members: RoomMember[]
      memberPlayers: Record<string, RoomPlayer[]>
    }) => {
-      console.log('[useRoomData] Received room-joined event:', data)
      if (data.roomId === roomData.id) {
        setRoomData((prev) => {
          if (!prev) return null
@@ -146,7 +138,6 @@ export function useRoomData() {
      members: RoomMember[]
      memberPlayers: Record<string, RoomPlayer[]>
    }) => {
-      console.log('[useRoomData] Received member-joined event:', data)
      if (data.roomId === roomData.id) {
        setRoomData((prev) => {
          if (!prev) return null
@@ -165,7 +156,6 @@ export function useRoomData() {
      members: RoomMember[]
      memberPlayers: Record<string, RoomPlayer[]>
    }) => {
-      console.log('[useRoomData] Received member-left event:', data)
      if (data.roomId === roomData.id) {
        setRoomData((prev) => {
          if (!prev) return null
@@ -182,7 +172,6 @@ export function useRoomData() {
      roomId: string
      memberPlayers: Record<string, RoomPlayer[]>
    }) => {
-      console.log('[useRoomData] Received room-players-updated event:', data)
      if (data.roomId === roomData.id) {
        setRoomData((prev) => {
          if (!prev) return null
@@ -207,10 +196,19 @@ export function useRoomData() {
    }
  }, [socket, roomData?.id])

+  // Function to notify room members of player updates
+  const notifyRoomOfPlayerUpdate = () => {
+    if (socket && roomData?.id && userId) {
+      console.log('[useRoomData] Notifying room of player update')
+      socket.emit('players-updated', { roomId: roomData.id, userId })
+    }
+  }
+
  return {
    roomData,
    // Loading if: userId is pending, currently fetching, or have userId but haven't tried fetching yet
    isLoading: isUserIdPending || isLoading || (!!userId && !hasAttemptedFetch),
    isInRoom: !!roomData,
+    notifyRoomOfPlayerUpdate,
  }
 }
--- a/apps/web/src/lib/arcade/player-manager.js
+++ b/apps/web/src/lib/arcade/player-manager.js
@@ -0,0 +1,120 @@
+"use strict";
+/**
+ * Player manager for arcade rooms
+ * Handles fetching and validating player participation in rooms
+ */
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.getAllPlayers = getAllPlayers;
+exports.getActivePlayers = getActivePlayers;
+exports.getRoomActivePlayers = getRoomActivePlayers;
+exports.getRoomPlayerIds = getRoomPlayerIds;
+exports.validatePlayerInRoom = validatePlayerInRoom;
+exports.getPlayer = getPlayer;
+exports.getPlayers = getPlayers;
+const drizzle_orm_1 = require("drizzle-orm");
+const db_1 = require("../../db");
+/**
+ * Get all players for a user (regardless of isActive status)
+ * @param viewerId - The guestId from the cookie (same as what getViewerId() returns)
+ */
+async function getAllPlayers(viewerId) {
+    // First get the user record by guestId
+    const user = await db_1.db.query.users.findFirst({
+        where: (0, drizzle_orm_1.eq)(db_1.schema.users.guestId, viewerId),
+    });
+    if (!user) {
+        return [];
+    }
+    // Now query all players by the actual user.id (no isActive filter)
+    return await db_1.db.query.players.findMany({
+        where: (0, drizzle_orm_1.eq)(db_1.schema.players.userId, user.id),
+        orderBy: db_1.schema.players.createdAt,
+    });
+}
+/**
+ * Get a user's active players (solo mode)
+ * These are the players that will participate when the user joins a solo game
+ * @param viewerId - The guestId from the cookie (same as what getViewerId() returns)
+ */
+async function getActivePlayers(viewerId) {
+    // First get the user record by guestId
+    const user = await db_1.db.query.users.findFirst({
+        where: (0, drizzle_orm_1.eq)(db_1.schema.users.guestId, viewerId),
+    });
+    if (!user) {
+        return [];
+    }
+    // Now query players by the actual user.id
+    return await db_1.db.query.players.findMany({
+        where: (0, drizzle_orm_1.and)((0, drizzle_orm_1.eq)(db_1.schema.players.userId, user.id), (0, drizzle_orm_1.eq)(db_1.schema.players.isActive, true)),
+        orderBy: db_1.schema.players.createdAt,
+    });
+}
+/**
+ * Get active players for all members in a room
+ * Returns only players marked isActive=true from each room member
+ * Returns a map of userId -> Player[]
+ */
+async function getRoomActivePlayers(roomId) {
+    // Get all room members
+    const members = await db_1.db.query.roomMembers.findMany({
+        where: (0, drizzle_orm_1.eq)(db_1.schema.roomMembers.roomId, roomId),
+    });
+    // Fetch active players for each member (respects isActive flag)
+    const playerMap = new Map();
+    for (const member of members) {
+        const players = await getActivePlayers(member.userId);
+        playerMap.set(member.userId, players);
+    }
+    return playerMap;
+}
+/**
+ * Get all player IDs that should participate in a room game
+ * Flattens the player lists from all room members
+ */
+async function getRoomPlayerIds(roomId) {
+    const playerMap = await getRoomActivePlayers(roomId);
+    const allPlayers = [];
+    for (const players of playerMap.values()) {
+        allPlayers.push(...players.map((p) => p.id));
+    }
+    return allPlayers;
+}
+/**
+ * Validate that a player ID belongs to a user who is a member of a room
+ */
+async function validatePlayerInRoom(playerId, roomId) {
+    // Get the player
+    const player = await db_1.db.query.players.findFirst({
+        where: (0, drizzle_orm_1.eq)(db_1.schema.players.id, playerId),
+    });
+    if (!player)
+        return false;
+    // Check if the player's user is a member of the room
+    const member = await db_1.db.query.roomMembers.findFirst({
+        where: (0, drizzle_orm_1.and)((0, drizzle_orm_1.eq)(db_1.schema.roomMembers.roomId, roomId), (0, drizzle_orm_1.eq)(db_1.schema.roomMembers.userId, player.userId)),
+    });
+    return !!member;
+}
+/**
+ * Get player details by ID
+ */
+async function getPlayer(playerId) {
+    return await db_1.db.query.players.findFirst({
+        where: (0, drizzle_orm_1.eq)(db_1.schema.players.id, playerId),
+    });
+}
+/**
+ * Get multiple players by IDs
+ */
+async function getPlayers(playerIds) {
+    if (playerIds.length === 0)
+        return [];
+    const players = [];
+    for (const id of playerIds) {
+        const player = await getPlayer(id);
+        if (player)
+            players.push(player);
+    }
+    return players;
+}
--- a/apps/web/src/lib/arcade/player-manager.ts
+++ b/apps/web/src/lib/arcade/player-manager.ts
@@ -8,8 +8,29 @@ import { db, schema } from '@/db'
 import type { Player } from '@/db/schema/players'

 /**
- * Get a user's active players
- * These are the players that will participate when the user joins a game
+ * Get all players for a user (regardless of isActive status)
+ * @param viewerId - The guestId from the cookie (same as what getViewerId() returns)
+ */
+export async function getAllPlayers(viewerId: string): Promise<Player[]> {
+  // First get the user record by guestId
+  const user = await db.query.users.findFirst({
+    where: eq(schema.users.guestId, viewerId),
+  })
+
+  if (!user) {
+    return []
+  }
+
+  // Now query all players by the actual user.id (no isActive filter)
+  return await db.query.players.findMany({
+    where: eq(schema.players.userId, user.id),
+    orderBy: schema.players.createdAt,
+  })
+}
+
+/**
+ * Get a user's active players (solo mode)
+ * These are the players that will participate when the user joins a solo game
 * @param viewerId - The guestId from the cookie (same as what getViewerId() returns)
 */
 export async function getActivePlayers(viewerId: string): Promise<Player[]> {
@@ -30,7 +51,8 @@ export async function getActivePlayers(viewerId: string): Promise<Player[]> {
 }

 /**
- * Get all active players for all members in a room
+ * Get active players for all members in a room
+ * Returns only players marked isActive=true from each room member
 * Returns a map of userId -> Player[]
 */
 export async function getRoomActivePlayers(roomId: string): Promise<Map<string, Player[]>> {
@@ -39,7 +61,7 @@ export async function getRoomActivePlayers(roomId: string): Promise<Map<string,
    where: eq(schema.roomMembers.roomId, roomId),
  })

-  // Fetch active players for each member
+  // Fetch active players for each member (respects isActive flag)
  const playerMap = new Map<string, Player[]>()
  for (const member of members) {
    const players = await getActivePlayers(member.userId)
--- a/apps/web/src/lib/arcade/room-code.js
+++ b/apps/web/src/lib/arcade/room-code.js
@@ -0,0 +1,37 @@
+"use strict";
+/**
+ * Room code generation utility
+ * Generates short, memorable codes for joining rooms
+ */
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.generateRoomCode = generateRoomCode;
+exports.isValidRoomCode = isValidRoomCode;
+exports.normalizeRoomCode = normalizeRoomCode;
+const CHARS = 'ABCDEFGHJKLMNPQRSTUVWXYZ23456789'; // Removed ambiguous chars: 0,O,1,I
+const CODE_LENGTH = 6;
+/**
+ * Generate a random 6-character room code
+ * Format: ABC123 (uppercase letters + numbers, no ambiguous chars)
+ */
+function generateRoomCode() {
+    let code = '';
+    for (let i = 0; i < CODE_LENGTH; i++) {
+        const randomIndex = Math.floor(Math.random() * CHARS.length);
+        code += CHARS[randomIndex];
+    }
+    return code;
+}
+/**
+ * Validate a room code format
+ */
+function isValidRoomCode(code) {
+    if (code.length !== CODE_LENGTH)
+        return false;
+    return code.split('').every((char) => CHARS.includes(char));
+}
+/**
+ * Normalize a room code (uppercase, remove spaces/dashes)
+ */
+function normalizeRoomCode(code) {
+    return code.toUpperCase().replace(/[\s-]/g, '');
+}
--- a/apps/web/src/lib/arcade/room-manager.js
+++ b/apps/web/src/lib/arcade/room-manager.js
@@ -0,0 +1,154 @@
+"use strict";
+/**
+ * Arcade room manager
+ * Handles database operations for arcade rooms
+ */
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.createRoom = createRoom;
+exports.getRoomById = getRoomById;
+exports.getRoomByCode = getRoomByCode;
+exports.updateRoom = updateRoom;
+exports.touchRoom = touchRoom;
+exports.deleteRoom = deleteRoom;
+exports.listActiveRooms = listActiveRooms;
+exports.cleanupExpiredRooms = cleanupExpiredRooms;
+exports.isRoomCreator = isRoomCreator;
+const drizzle_orm_1 = require("drizzle-orm");
+const db_1 = require("../../db");
+const room_code_1 = require("./room-code");
+/**
+ * Create a new arcade room
+ * Generates a unique room code and creates the room in the database
+ */
+async function createRoom(options) {
+    const now = new Date();
+    // Generate unique room code (retry up to 5 times if collision)
+    let code = (0, room_code_1.generateRoomCode)();
+    let attempts = 0;
+    const MAX_ATTEMPTS = 5;
+    while (attempts < MAX_ATTEMPTS) {
+        const existing = await getRoomByCode(code);
+        if (!existing)
+            break;
+        code = (0, room_code_1.generateRoomCode)();
+        attempts++;
+    }
+    if (attempts === MAX_ATTEMPTS) {
+        throw new Error('Failed to generate unique room code');
+    }
+    const newRoom = {
+        code,
+        name: options.name,
+        createdBy: options.createdBy,
+        creatorName: options.creatorName,
+        createdAt: now,
+        lastActivity: now,
+        ttlMinutes: options.ttlMinutes || 60,
+        isLocked: false,
+        gameName: options.gameName,
+        gameConfig: options.gameConfig,
+        status: 'lobby',
+        currentSessionId: null,
+        totalGamesPlayed: 0,
+    };
+    const [room] = await db_1.db.insert(db_1.schema.arcadeRooms).values(newRoom).returning();
+    console.log('[Room Manager] Created room:', room.id, 'code:', room.code);
+    return room;
+}
+/**
+ * Get a room by ID
+ */
+async function getRoomById(roomId) {
+    return await db_1.db.query.arcadeRooms.findFirst({
+        where: (0, drizzle_orm_1.eq)(db_1.schema.arcadeRooms.id, roomId),
+    });
+}
+/**
+ * Get a room by code
+ */
+async function getRoomByCode(code) {
+    return await db_1.db.query.arcadeRooms.findFirst({
+        where: (0, drizzle_orm_1.eq)(db_1.schema.arcadeRooms.code, code.toUpperCase()),
+    });
+}
+/**
+ * Update a room
+ */
+async function updateRoom(roomId, updates) {
+    const now = new Date();
+    // Always update lastActivity on any room update
+    const updateData = {
+        ...updates,
+        lastActivity: now,
+    };
+    const [updated] = await db_1.db
+        .update(db_1.schema.arcadeRooms)
+        .set(updateData)
+        .where((0, drizzle_orm_1.eq)(db_1.schema.arcadeRooms.id, roomId))
+        .returning();
+    return updated;
+}
+/**
+ * Update room activity timestamp
+ * Call this on any room activity to refresh TTL
+ */
+async function touchRoom(roomId) {
+    await db_1.db
+        .update(db_1.schema.arcadeRooms)
+        .set({ lastActivity: new Date() })
+        .where((0, drizzle_orm_1.eq)(db_1.schema.arcadeRooms.id, roomId));
+}
+/**
+ * Delete a room
+ * Cascade deletes all room members
+ */
+async function deleteRoom(roomId) {
+    await db_1.db.delete(db_1.schema.arcadeRooms).where((0, drizzle_orm_1.eq)(db_1.schema.arcadeRooms.id, roomId));
+    console.log('[Room Manager] Deleted room:', roomId);
+}
+/**
+ * List active rooms
+ * Returns rooms ordered by most recently active
+ */
+async function listActiveRooms(gameName) {
+    const whereConditions = [];
+    // Filter by game if specified
+    if (gameName) {
+        whereConditions.push((0, drizzle_orm_1.eq)(db_1.schema.arcadeRooms.gameName, gameName));
+    }
+    // Only return non-locked rooms in lobby or playing status
+    whereConditions.push((0, drizzle_orm_1.eq)(db_1.schema.arcadeRooms.isLocked, false), (0, drizzle_orm_1.or)((0, drizzle_orm_1.eq)(db_1.schema.arcadeRooms.status, 'lobby'), (0, drizzle_orm_1.eq)(db_1.schema.arcadeRooms.status, 'playing')));
+    return await db_1.db.query.arcadeRooms.findMany({
+        where: whereConditions.length > 0 ? (0, drizzle_orm_1.and)(...whereConditions) : undefined,
+        orderBy: [(0, drizzle_orm_1.desc)(db_1.schema.arcadeRooms.lastActivity)],
+        limit: 50, // Limit to 50 most recent rooms
+    });
+}
+/**
+ * Clean up expired rooms
+ * Delete rooms that have exceeded their TTL
+ */
+async function cleanupExpiredRooms() {
+    const now = new Date();
+    // Find rooms where lastActivity + ttlMinutes < now
+    const expiredRooms = await db_1.db.query.arcadeRooms.findMany({
+        columns: { id: true, ttlMinutes: true, lastActivity: true },
+    });
+    const toDelete = expiredRooms.filter((room) => {
+        const expiresAt = new Date(room.lastActivity.getTime() + room.ttlMinutes * 60 * 1000);
+        return expiresAt < now;
+    });
+    if (toDelete.length > 0) {
+        const ids = toDelete.map((r) => r.id);
+        await db_1.db.delete(db_1.schema.arcadeRooms).where((0, drizzle_orm_1.or)(...ids.map((id) => (0, drizzle_orm_1.eq)(db_1.schema.arcadeRooms.id, id))));
+        console.log(`[Room Manager] Cleaned up ${toDelete.length} expired rooms`);
+    }
+    return toDelete.length;
+}
+/**
+ * Check if a user is the creator of a room
+ */
+async function isRoomCreator(roomId, userId) {
+    const room = await getRoomById(roomId);
+    return room?.createdBy === userId;
+}
--- a/apps/web/src/lib/arcade/room-membership.js
+++ b/apps/web/src/lib/arcade/room-membership.js
@@ -0,0 +1,179 @@
+"use strict";
+/**
+ * Room membership manager
+ * Handles database operations for room members
+ */
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.addRoomMember = addRoomMember;
+exports.getRoomMember = getRoomMember;
+exports.getRoomMembers = getRoomMembers;
+exports.getOnlineRoomMembers = getOnlineRoomMembers;
+exports.setMemberOnline = setMemberOnline;
+exports.touchMember = touchMember;
+exports.removeMember = removeMember;
+exports.removeAllMembers = removeAllMembers;
+exports.getOnlineMemberCount = getOnlineMemberCount;
+exports.isMember = isMember;
+exports.getUserRooms = getUserRooms;
+const drizzle_orm_1 = require("drizzle-orm");
+const db_1 = require("../../db");
+/**
+ * Add a member to a room
+ * Automatically removes user from any other rooms they're in (modal room enforcement)
+ * Returns the new membership and info about rooms that were auto-left
+ */
+async function addRoomMember(options) {
+    const now = new Date();
+    // Check if member already exists in THIS room
+    const existing = await getRoomMember(options.roomId, options.userId);
+    if (existing) {
+        // Already in this room - just update status (no auto-leave needed)
+        const [updated] = await db_1.db
+            .update(db_1.schema.roomMembers)
+            .set({
+            isOnline: true,
+            lastSeen: now,
+        })
+            .where((0, drizzle_orm_1.eq)(db_1.schema.roomMembers.id, existing.id))
+            .returning();
+        return { member: updated };
+    }
+    // AUTO-LEAVE LOGIC: Remove from all other rooms before joining this one
+    const currentRooms = await getUserRooms(options.userId);
+    const autoLeaveResult = {
+        leftRooms: [],
+        previousRoomMembers: [],
+    };
+    for (const roomId of currentRooms) {
+        if (roomId !== options.roomId) {
+            // Get member info before removing (for socket events)
+            const memberToRemove = await getRoomMember(roomId, options.userId);
+            if (memberToRemove) {
+                autoLeaveResult.previousRoomMembers.push({
+                    roomId,
+                    member: memberToRemove,
+                });
+            }
+            // Remove from room
+            await removeMember(roomId, options.userId);
+            autoLeaveResult.leftRooms.push(roomId);
+            console.log(`[Room Membership] Auto-left room ${roomId} for user ${options.userId}`);
+        }
+    }
+    // Now add to new room
+    const newMember = {
+        roomId: options.roomId,
+        userId: options.userId,
+        displayName: options.displayName,
+        isCreator: options.isCreator || false,
+        joinedAt: now,
+        lastSeen: now,
+        isOnline: true,
+    };
+    try {
+        const [member] = await db_1.db.insert(db_1.schema.roomMembers).values(newMember).returning();
+        console.log('[Room Membership] Added member:', member.userId, 'to room:', member.roomId);
+        return {
+            member,
+            autoLeaveResult: autoLeaveResult.leftRooms.length > 0 ? autoLeaveResult : undefined,
+        };
+    }
+    catch (error) {
+        // Handle unique constraint violation
+        // This should rarely happen due to auto-leave logic above, but catch it for safety
+        if (error.code === 'SQLITE_CONSTRAINT' ||
+            error.message?.includes('UNIQUE') ||
+            error.message?.includes('unique')) {
+            console.error('[Room Membership] Unique constraint violation:', error.message);
+            throw new Error('ROOM_MEMBERSHIP_CONFLICT: User is already in another room. This should have been handled by auto-leave logic.');
+        }
+        throw error;
+    }
+}
+/**
+ * Get a specific room member
+ */
+async function getRoomMember(roomId, userId) {
+    return await db_1.db.query.roomMembers.findFirst({
+        where: (0, drizzle_orm_1.and)((0, drizzle_orm_1.eq)(db_1.schema.roomMembers.roomId, roomId), (0, drizzle_orm_1.eq)(db_1.schema.roomMembers.userId, userId)),
+    });
+}
+/**
+ * Get all members in a room
+ */
+async function getRoomMembers(roomId) {
+    return await db_1.db.query.roomMembers.findMany({
+        where: (0, drizzle_orm_1.eq)(db_1.schema.roomMembers.roomId, roomId),
+        orderBy: db_1.schema.roomMembers.joinedAt,
+    });
+}
+/**
+ * Get online members in a room
+ */
+async function getOnlineRoomMembers(roomId) {
+    return await db_1.db.query.roomMembers.findMany({
+        where: (0, drizzle_orm_1.and)((0, drizzle_orm_1.eq)(db_1.schema.roomMembers.roomId, roomId), (0, drizzle_orm_1.eq)(db_1.schema.roomMembers.isOnline, true)),
+        orderBy: db_1.schema.roomMembers.joinedAt,
+    });
+}
+/**
+ * Update member's online status
+ */
+async function setMemberOnline(roomId, userId, isOnline) {
+    await db_1.db
+        .update(db_1.schema.roomMembers)
+        .set({
+        isOnline,
+        lastSeen: new Date(),
+    })
+        .where((0, drizzle_orm_1.and)((0, drizzle_orm_1.eq)(db_1.schema.roomMembers.roomId, roomId), (0, drizzle_orm_1.eq)(db_1.schema.roomMembers.userId, userId)));
+}
+/**
+ * Update member's last seen timestamp
+ */
+async function touchMember(roomId, userId) {
+    await db_1.db
+        .update(db_1.schema.roomMembers)
+        .set({ lastSeen: new Date() })
+        .where((0, drizzle_orm_1.and)((0, drizzle_orm_1.eq)(db_1.schema.roomMembers.roomId, roomId), (0, drizzle_orm_1.eq)(db_1.schema.roomMembers.userId, userId)));
+}
+/**
+ * Remove a member from a room
+ */
+async function removeMember(roomId, userId) {
+    await db_1.db
+        .delete(db_1.schema.roomMembers)
+        .where((0, drizzle_orm_1.and)((0, drizzle_orm_1.eq)(db_1.schema.roomMembers.roomId, roomId), (0, drizzle_orm_1.eq)(db_1.schema.roomMembers.userId, userId)));
+    console.log('[Room Membership] Removed member:', userId, 'from room:', roomId);
+}
+/**
+ * Remove all members from a room
+ */
+async function removeAllMembers(roomId) {
+    await db_1.db.delete(db_1.schema.roomMembers).where((0, drizzle_orm_1.eq)(db_1.schema.roomMembers.roomId, roomId));
+    console.log('[Room Membership] Removed all members from room:', roomId);
+}
+/**
+ * Get count of online members in a room
+ */
+async function getOnlineMemberCount(roomId) {
+    const members = await getOnlineRoomMembers(roomId);
+    return members.length;
+}
+/**
+ * Check if a user is a member of a room
+ */
+async function isMember(roomId, userId) {
+    const member = await getRoomMember(roomId, userId);
+    return !!member;
+}
+/**
+ * Get all rooms a user is a member of
+ */
+async function getUserRooms(userId) {
+    const memberships = await db_1.db.query.roomMembers.findMany({
+        where: (0, drizzle_orm_1.eq)(db_1.schema.roomMembers.userId, userId),
+        columns: { roomId: true },
+    });
+    return memberships.map((m) => m.roomId);
+}
--- a/apps/web/src/lib/arcade/room-ttl-cleanup.js
+++ b/apps/web/src/lib/arcade/room-ttl-cleanup.js
@@ -0,0 +1,55 @@
+"use strict";
+/**
+ * Room TTL Cleanup Scheduler
+ * Periodically cleans up expired rooms
+ */
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.startRoomTTLCleanup = startRoomTTLCleanup;
+exports.stopRoomTTLCleanup = stopRoomTTLCleanup;
+const room_manager_1 = require("./room-manager");
+// Cleanup interval: run every 5 minutes
+const CLEANUP_INTERVAL_MS = 5 * 60 * 1000;
+let cleanupInterval = null;
+/**
+ * Start the TTL cleanup scheduler
+ * Runs cleanup every 5 minutes
+ */
+function startRoomTTLCleanup() {
+    if (cleanupInterval) {
+        console.log('[Room TTL] Cleanup scheduler already running');
+        return;
+    }
+    console.log('[Room TTL] Starting cleanup scheduler (every 5 minutes)');
+    // Run immediately on start
+    (0, room_manager_1.cleanupExpiredRooms)()
+        .then((count) => {
+        if (count > 0) {
+            console.log(`[Room TTL] Initial cleanup removed ${count} expired rooms`);
+        }
+    })
+        .catch((error) => {
+        console.error('[Room TTL] Initial cleanup failed:', error);
+    });
+    // Then run periodically
+    cleanupInterval = setInterval(async () => {
+        try {
+            const count = await (0, room_manager_1.cleanupExpiredRooms)();
+            if (count > 0) {
+                console.log(`[Room TTL] Cleanup removed ${count} expired rooms`);
+            }
+        }
+        catch (error) {
+            console.error('[Room TTL] Cleanup failed:', error);
+        }
+    }, CLEANUP_INTERVAL_MS);
+}
+/**
+ * Stop the TTL cleanup scheduler
+ */
+function stopRoomTTLCleanup() {
+    if (cleanupInterval) {
+        clearInterval(cleanupInterval);
+        cleanupInterval = null;
+        console.log('[Room TTL] Cleanup scheduler stopped');
+    }
+}
--- a/apps/web/src/lib/arcade/session-manager.js
+++ b/apps/web/src/lib/arcade/session-manager.js
@@ -0,0 +1,296 @@
+"use strict";
+/**
+ * Arcade session manager
+ * Handles database operations and validation for arcade sessions
+ */
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.getArcadeSessionByRoom = getArcadeSessionByRoom;
+exports.createArcadeSession = createArcadeSession;
+exports.getArcadeSession = getArcadeSession;
+exports.applyGameMove = applyGameMove;
+exports.deleteArcadeSession = deleteArcadeSession;
+exports.updateSessionActivity = updateSessionActivity;
+exports.cleanupExpiredSessions = cleanupExpiredSessions;
+const drizzle_orm_1 = require("drizzle-orm");
+const db_1 = require("../../db");
+const validation_1 = require("./validation");
+const TTL_HOURS = 24;
+/**
+ * Helper: Get database user ID from guest ID
+ * The API uses guestId (from cookies) but database FKs use the internal user.id
+ */
+async function getUserIdFromGuestId(guestId) {
+    const user = await db_1.db.query.users.findFirst({
+        where: (0, drizzle_orm_1.eq)(db_1.schema.users.guestId, guestId),
+        columns: { id: true },
+    });
+    return user?.id;
+}
+/**
+ * Get arcade session by room ID (for room-based multiplayer games)
+ * Returns the shared session for all room members
+ * @param roomId - The room ID
+ */
+async function getArcadeSessionByRoom(roomId) {
+    const [session] = await db_1.db
+        .select()
+        .from(db_1.schema.arcadeSessions)
+        .where((0, drizzle_orm_1.eq)(db_1.schema.arcadeSessions.roomId, roomId))
+        .limit(1);
+    if (!session)
+        return undefined;
+    // Check if session has expired
+    if (session.expiresAt < new Date()) {
+        // Clean up expired room session
+        await db_1.db.delete(db_1.schema.arcadeSessions).where((0, drizzle_orm_1.eq)(db_1.schema.arcadeSessions.roomId, roomId));
+        return undefined;
+    }
+    return session;
+}
+/**
+ * Create a new arcade session
+ * For room-based games, checks if a session already exists for the room
+ */
+async function createArcadeSession(options) {
+    const now = new Date();
+    const expiresAt = new Date(now.getTime() + TTL_HOURS * 60 * 60 * 1000);
+    // For room-based games, check if session already exists for this room
+    if (options.roomId) {
+        const existingRoomSession = await getArcadeSessionByRoom(options.roomId);
+        if (existingRoomSession) {
+            console.log('[Session Manager] Room session already exists, returning existing:', {
+                roomId: options.roomId,
+                sessionUserId: existingRoomSession.userId,
+                version: existingRoomSession.version,
+            });
+            return existingRoomSession;
+        }
+    }
+    // Find or create user by guest ID
+    let user = await db_1.db.query.users.findFirst({
+        where: (0, drizzle_orm_1.eq)(db_1.schema.users.guestId, options.userId),
+    });
+    if (!user) {
+        console.log('[Session Manager] Creating new user with guestId:', options.userId);
+        const [newUser] = await db_1.db
+            .insert(db_1.schema.users)
+            .values({
+            guestId: options.userId, // Let id auto-generate via $defaultFn
+            createdAt: now,
+        })
+            .returning();
+        user = newUser;
+        console.log('[Session Manager] Created user with id:', user.id);
+    }
+    else {
+        console.log('[Session Manager] Found existing user with id:', user.id);
+    }
+    const newSession = {
+        userId: user.id, // Use the actual database ID, not the guestId
+        currentGame: options.gameName,
+        gameUrl: options.gameUrl,
+        gameState: options.initialState,
+        activePlayers: options.activePlayers,
+        roomId: options.roomId, // Associate session with room
+        startedAt: now,
+        lastActivityAt: now,
+        expiresAt,
+        isActive: true,
+        version: 1,
+    };
+    console.log('[Session Manager] Creating new session:', {
+        userId: user.id,
+        roomId: options.roomId,
+        gameName: options.gameName,
+    });
+    const [session] = await db_1.db.insert(db_1.schema.arcadeSessions).values(newSession).returning();
+    return session;
+}
+/**
+ * Get active arcade session for a user
+ * @param guestId - The guest ID from the cookie (not the database user.id)
+ */
+async function getArcadeSession(guestId) {
+    const userId = await getUserIdFromGuestId(guestId);
+    if (!userId)
+        return undefined;
+    const [session] = await db_1.db
+        .select()
+        .from(db_1.schema.arcadeSessions)
+        .where((0, drizzle_orm_1.eq)(db_1.schema.arcadeSessions.userId, userId))
+        .limit(1);
+    if (!session)
+        return undefined;
+    // Check if session has expired
+    if (session.expiresAt < new Date()) {
+        await deleteArcadeSession(guestId);
+        return undefined;
+    }
+    // Check if session has a valid room association
+    // Sessions without rooms are orphaned and should be cleaned up
+    if (!session.roomId) {
+        console.log('[Session Manager] Deleting orphaned session without room:', session.userId);
+        await deleteArcadeSession(guestId);
+        return undefined;
+    }
+    // Verify the room still exists
+    const room = await db_1.db.query.arcadeRooms.findFirst({
+        where: (0, drizzle_orm_1.eq)(db_1.schema.arcadeRooms.id, session.roomId),
+    });
+    if (!room) {
+        console.log('[Session Manager] Deleting session with non-existent room:', session.roomId);
+        await deleteArcadeSession(guestId);
+        return undefined;
+    }
+    return session;
+}
+/**
+ * Apply a game move to the session (with validation)
+ * @param userId - The guest ID from the cookie
+ * @param move - The game move to apply
+ * @param roomId - Optional room ID for room-based games (enables shared session)
+ */
+async function applyGameMove(userId, move, roomId) {
+    // For room-based games, look up the shared room session
+    // For solo games, look up the user's personal session
+    const session = roomId ? await getArcadeSessionByRoom(roomId) : await getArcadeSession(userId);
+    if (!session) {
+        return {
+            success: false,
+            error: 'No active session found',
+        };
+    }
+    if (!session.isActive) {
+        return {
+            success: false,
+            error: 'Session is not active',
+        };
+    }
+    // Get the validator for this game
+    const validator = (0, validation_1.getValidator)(session.currentGame);
+    console.log('[SessionManager] About to validate move:', {
+        moveType: move.type,
+        playerId: move.playerId,
+        gameStateCurrentPlayer: session.gameState?.currentPlayer,
+        gameStateActivePlayers: session.gameState?.activePlayers,
+        gameStatePhase: session.gameState?.gamePhase,
+    });
+    // Fetch player ownership for authorization checks (room-based games)
+    let playerOwnership;
+    let internalUserId;
+    if (session.roomId) {
+        try {
+            // Convert guestId to internal userId for ownership comparison
+            internalUserId = await getUserIdFromGuestId(userId);
+            if (!internalUserId) {
+                console.error('[SessionManager] Failed to convert guestId to userId:', userId);
+                return {
+                    success: false,
+                    error: 'User not found',
+                };
+            }
+            const players = await db_1.db.query.players.findMany({
+                columns: {
+                    id: true,
+                    userId: true,
+                },
+            });
+            playerOwnership = Object.fromEntries(players.map((p) => [p.id, p.userId]));
+            console.log('[SessionManager] Player ownership map:', playerOwnership);
+            console.log('[SessionManager] Internal userId for authorization:', internalUserId);
+        }
+        catch (error) {
+            console.error('[SessionManager] Failed to fetch player ownership:', error);
+        }
+    }
+    // Validate the move with authorization context (use internal userId, not guestId)
+    const validationResult = validator.validateMove(session.gameState, move, {
+        userId: internalUserId || userId, // Use internal userId for room-based games
+        playerOwnership,
+    });
+    console.log('[SessionManager] Validation result:', {
+        valid: validationResult.valid,
+        error: validationResult.error,
+    });
+    if (!validationResult.valid) {
+        return {
+            success: false,
+            error: validationResult.error || 'Invalid move',
+        };
+    }
+    // Update the session with new state (using optimistic locking)
+    const now = new Date();
+    const expiresAt = new Date(now.getTime() + TTL_HOURS * 60 * 60 * 1000);
+    try {
+        const [updatedSession] = await db_1.db
+            .update(db_1.schema.arcadeSessions)
+            .set({
+            gameState: validationResult.newState,
+            lastActivityAt: now,
+            expiresAt,
+            version: session.version + 1,
+        })
+            .where((0, drizzle_orm_1.eq)(db_1.schema.arcadeSessions.userId, session.userId) // Use the userId from the session we just fetched
+        )
+            // Version check for optimistic locking would go here
+            // SQLite doesn't support WHERE clauses in UPDATE with RETURNING easily
+            // We'll handle this by checking the version after
+            .returning();
+        if (!updatedSession) {
+            return {
+                success: false,
+                error: 'Failed to update session',
+            };
+        }
+        return {
+            success: true,
+            session: updatedSession,
+        };
+    }
+    catch (error) {
+        console.error('Error updating session:', error);
+        return {
+            success: false,
+            error: 'Database error',
+        };
+    }
+}
+/**
+ * Delete an arcade session
+ * @param guestId - The guest ID from the cookie (not the database user.id)
+ */
+async function deleteArcadeSession(guestId) {
+    const userId = await getUserIdFromGuestId(guestId);
+    if (!userId)
+        return;
+    await db_1.db.delete(db_1.schema.arcadeSessions).where((0, drizzle_orm_1.eq)(db_1.schema.arcadeSessions.userId, userId));
+}
+/**
+ * Update session activity timestamp (keep-alive)
+ * @param guestId - The guest ID from the cookie (not the database user.id)
+ */
+async function updateSessionActivity(guestId) {
+    const userId = await getUserIdFromGuestId(guestId);
+    if (!userId)
+        return;
+    const now = new Date();
+    const expiresAt = new Date(now.getTime() + TTL_HOURS * 60 * 60 * 1000);
+    await db_1.db
+        .update(db_1.schema.arcadeSessions)
+        .set({
+        lastActivityAt: now,
+        expiresAt,
+    })
+        .where((0, drizzle_orm_1.eq)(db_1.schema.arcadeSessions.userId, userId));
+}
+/**
+ * Clean up expired sessions (should be called periodically)
+ */
+async function cleanupExpiredSessions() {
+    const now = new Date();
+    const result = await db_1.db
+        .delete(db_1.schema.arcadeSessions)
+        .where((0, drizzle_orm_1.eq)(db_1.schema.arcadeSessions.expiresAt, now))
+        .returning();
+    return result.length;
+}
--- a/apps/web/src/lib/arcade/session-manager.ts
+++ b/apps/web/src/lib/arcade/session-manager.ts
@@ -37,8 +37,35 @@ async function getUserIdFromGuestId(guestId: string): Promise<string | undefined
  return user?.id
 }

+/**
+ * Get arcade session by room ID (for room-based multiplayer games)
+ * Returns the shared session for all room members
+ * @param roomId - The room ID
+ */
+export async function getArcadeSessionByRoom(
+  roomId: string
+): Promise<schema.ArcadeSession | undefined> {
+  const [session] = await db
+    .select()
+    .from(schema.arcadeSessions)
+    .where(eq(schema.arcadeSessions.roomId, roomId))
+    .limit(1)
+
+  if (!session) return undefined
+
+  // Check if session has expired
+  if (session.expiresAt < new Date()) {
+    // Clean up expired room session
+    await db.delete(schema.arcadeSessions).where(eq(schema.arcadeSessions.roomId, roomId))
+    return undefined
+  }
+
+  return session
+}
+
 /**
 * Create a new arcade session
+ * For room-based games, checks if a session already exists for the room
 */
 export async function createArcadeSession(
  options: CreateSessionOptions
@@ -46,6 +73,19 @@ export async function createArcadeSession(
  const now = new Date()
  const expiresAt = new Date(now.getTime() + TTL_HOURS * 60 * 60 * 1000)

+  // For room-based games, check if session already exists for this room
+  if (options.roomId) {
+    const existingRoomSession = await getArcadeSessionByRoom(options.roomId)
+    if (existingRoomSession) {
+      console.log('[Session Manager] Room session already exists, returning existing:', {
+        roomId: options.roomId,
+        sessionUserId: existingRoomSession.userId,
+        version: existingRoomSession.version,
+      })
+      return existingRoomSession
+    }
+  }
+
  // Find or create user by guest ID
  let user = await db.query.users.findFirst({
    where: eq(schema.users.guestId, options.userId),
@@ -80,6 +120,12 @@ export async function createArcadeSession(
    version: 1,
  }

+  console.log('[Session Manager] Creating new session:', {
+    userId: user.id,
+    roomId: options.roomId,
+    gameName: options.gameName,
+  })
+
  const [session] = await db.insert(schema.arcadeSessions).values(newSession).returning()
  return session
 }
@@ -130,9 +176,18 @@ export async function getArcadeSession(guestId: string): Promise<schema.ArcadeSe

 /**
 * Apply a game move to the session (with validation)
+ * @param userId - The guest ID from the cookie
+ * @param move - The game move to apply
+ * @param roomId - Optional room ID for room-based games (enables shared session)
 */
-export async function applyGameMove(userId: string, move: GameMove): Promise<SessionUpdateResult> {
-  const session = await getArcadeSession(userId)
+export async function applyGameMove(
+  userId: string,
+  move: GameMove,
+  roomId?: string
+): Promise<SessionUpdateResult> {
+  // For room-based games, look up the shared room session
+  // For solo games, look up the user's personal session
+  const session = roomId ? await getArcadeSessionByRoom(roomId) : await getArcadeSession(userId)

  if (!session) {
    return {
@@ -159,8 +214,40 @@ export async function applyGameMove(userId: string, move: GameMove): Promise<Ses
    gameStatePhase: (session.gameState as any)?.gamePhase,
  })

-  // Validate the move
-  const validationResult = validator.validateMove(session.gameState, move)
+  // Fetch player ownership for authorization checks (room-based games)
+  let playerOwnership: Record<string, string> | undefined
+  let internalUserId: string | undefined
+  if (session.roomId) {
+    try {
+      // Convert guestId to internal userId for ownership comparison
+      internalUserId = await getUserIdFromGuestId(userId)
+      if (!internalUserId) {
+        console.error('[SessionManager] Failed to convert guestId to userId:', userId)
+        return {
+          success: false,
+          error: 'User not found',
+        }
+      }
+
+      const players = await db.query.players.findMany({
+        columns: {
+          id: true,
+          userId: true,
+        },
+      })
+      playerOwnership = Object.fromEntries(players.map((p) => [p.id, p.userId]))
+      console.log('[SessionManager] Player ownership map:', playerOwnership)
+      console.log('[SessionManager] Internal userId for authorization:', internalUserId)
+    } catch (error) {
+      console.error('[SessionManager] Failed to fetch player ownership:', error)
+    }
+  }
+
+  // Validate the move with authorization context (use internal userId, not guestId)
+  const validationResult = validator.validateMove(session.gameState, move, {
+    userId: internalUserId || userId, // Use internal userId for room-based games
+    playerOwnership,
+  })

  console.log('[SessionManager] Validation result:', {
    valid: validationResult.valid,
--- a/apps/web/src/lib/arcade/validation/MatchingGameValidator.js
+++ b/apps/web/src/lib/arcade/validation/MatchingGameValidator.js
@@ -0,0 +1,469 @@
+"use strict";
+/**
+ * Server-side validator for matching game
+ * Validates all game moves and state transitions
+ */
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.matchingGameValidator = exports.MatchingGameValidator = void 0;
+const cardGeneration_1 = require("../../../app/games/matching/utils/cardGeneration");
+const matchValidation_1 = require("../../../app/games/matching/utils/matchValidation");
+class MatchingGameValidator {
+    validateMove(state, move, context) {
+        switch (move.type) {
+            case 'FLIP_CARD':
+                return this.validateFlipCard(state, move.data.cardId, move.playerId, context);
+            case 'START_GAME':
+                return this.validateStartGame(state, move.data.activePlayers, move.data.cards, move.data.playerMetadata);
+            case 'CLEAR_MISMATCH':
+                return this.validateClearMismatch(state);
+            case 'GO_TO_SETUP':
+                return this.validateGoToSetup(state);
+            case 'SET_CONFIG':
+                return this.validateSetConfig(state, move.data.field, move.data.value);
+            case 'RESUME_GAME':
+                return this.validateResumeGame(state);
+            case 'HOVER_CARD':
+                return this.validateHoverCard(state, move.data.cardId, move.playerId);
+            default:
+                return {
+                    valid: false,
+                    error: `Unknown move type: ${move.type}`,
+                };
+        }
+    }
+    validateFlipCard(state, cardId, playerId, context) {
+        // Game must be in playing phase
+        if (state.gamePhase !== 'playing') {
+            return {
+                valid: false,
+                error: 'Cannot flip cards outside of playing phase',
+            };
+        }
+        // Check if it's the player's turn (in multiplayer)
+        if (state.activePlayers.length > 1 && state.currentPlayer !== playerId) {
+            console.log('[Validator] Turn check failed:', {
+                activePlayers: state.activePlayers,
+                currentPlayer: state.currentPlayer,
+                currentPlayerType: typeof state.currentPlayer,
+                playerId,
+                playerIdType: typeof playerId,
+                matches: state.currentPlayer === playerId,
+            });
+            return {
+                valid: false,
+                error: 'Not your turn',
+            };
+        }
+        // Check player ownership authorization (if context provided)
+        if (context?.userId && context?.playerOwnership) {
+            const playerOwner = context.playerOwnership[playerId];
+            if (playerOwner && playerOwner !== context.userId) {
+                console.log('[Validator] Player ownership check failed:', {
+                    playerId,
+                    playerOwner,
+                    requestingUserId: context.userId,
+                });
+                return {
+                    valid: false,
+                    error: 'You can only move your own players',
+                };
+            }
+        }
+        // Find the card
+        const card = state.gameCards.find((c) => c.id === cardId);
+        if (!card) {
+            return {
+                valid: false,
+                error: 'Card not found',
+            };
+        }
+        // Validate using existing game logic
+        if (!(0, matchValidation_1.canFlipCard)(card, state.flippedCards, state.isProcessingMove)) {
+            return {
+                valid: false,
+                error: 'Cannot flip this card',
+            };
+        }
+        // Calculate new state
+        const newFlippedCards = [...state.flippedCards, card];
+        let newState = {
+            ...state,
+            flippedCards: newFlippedCards,
+            isProcessingMove: newFlippedCards.length === 2,
+            // Clear mismatch feedback when player flips a new card
+            showMismatchFeedback: false,
+        };
+        // If two cards are flipped, check for match
+        if (newFlippedCards.length === 2) {
+            const [card1, card2] = newFlippedCards;
+            const matchResult = (0, matchValidation_1.validateMatch)(card1, card2);
+            if (matchResult.isValid) {
+                // Match found - update cards
+                newState = {
+                    ...newState,
+                    gameCards: newState.gameCards.map((c) => c.id === card1.id || c.id === card2.id
+                        ? { ...c, matched: true, matchedBy: state.currentPlayer }
+                        : c),
+                    matchedPairs: state.matchedPairs + 1,
+                    scores: {
+                        ...state.scores,
+                        [state.currentPlayer]: (state.scores[state.currentPlayer] || 0) + 1,
+                    },
+                    consecutiveMatches: {
+                        ...state.consecutiveMatches,
+                        [state.currentPlayer]: (state.consecutiveMatches[state.currentPlayer] || 0) + 1,
+                    },
+                    moves: state.moves + 1,
+                    flippedCards: [],
+                    isProcessingMove: false,
+                };
+                // Check if game is complete
+                if (newState.matchedPairs === newState.totalPairs) {
+                    newState = {
+                        ...newState,
+                        gamePhase: 'results',
+                        gameEndTime: Date.now(),
+                    };
+                }
+            }
+            else {
+                // Match failed - keep cards flipped briefly so player can see them
+                // Client will handle clearing them after a delay
+                const shouldSwitchPlayer = state.activePlayers.length > 1;
+                const nextPlayerIndex = shouldSwitchPlayer
+                    ? (state.activePlayers.indexOf(state.currentPlayer) + 1) % state.activePlayers.length
+                    : 0;
+                const nextPlayer = shouldSwitchPlayer
+                    ? state.activePlayers[nextPlayerIndex]
+                    : state.currentPlayer;
+                newState = {
+                    ...newState,
+                    currentPlayer: nextPlayer,
+                    consecutiveMatches: {
+                        ...state.consecutiveMatches,
+                        [state.currentPlayer]: 0,
+                    },
+                    moves: state.moves + 1,
+                    // Keep flippedCards so player can see both cards
+                    flippedCards: newFlippedCards,
+                    isProcessingMove: true, // Keep processing state so no more cards can be flipped
+                    showMismatchFeedback: true,
+                };
+            }
+        }
+        return {
+            valid: true,
+            newState,
+        };
+    }
+    validateStartGame(state, activePlayers, cards, playerMetadata) {
+        // Allow starting a new game from any phase (for "New Game" button)
+        // Must have at least one player
+        if (!activePlayers || activePlayers.length === 0) {
+            return {
+                valid: false,
+                error: 'Must have at least one player',
+            };
+        }
+        // Use provided cards or generate new ones
+        const gameCards = cards || (0, cardGeneration_1.generateGameCards)(state.gameType, state.difficulty);
+        const newState = {
+            ...state,
+            gameCards,
+            cards: gameCards,
+            activePlayers,
+            playerMetadata: playerMetadata || {}, // Store player metadata for cross-user visibility
+            gamePhase: 'playing',
+            gameStartTime: Date.now(),
+            currentPlayer: activePlayers[0],
+            flippedCards: [],
+            matchedPairs: 0,
+            moves: 0,
+            scores: activePlayers.reduce((acc, p) => ({ ...acc, [p]: 0 }), {}),
+            consecutiveMatches: activePlayers.reduce((acc, p) => ({ ...acc, [p]: 0 }), {}),
+            // PAUSE/RESUME: Save original config so we can detect changes
+            originalConfig: {
+                gameType: state.gameType,
+                difficulty: state.difficulty,
+                turnTimer: state.turnTimer,
+            },
+            // Clear any paused game state (starting fresh)
+            pausedGamePhase: undefined,
+            pausedGameState: undefined,
+        };
+        return {
+            valid: true,
+            newState,
+        };
+    }
+    validateClearMismatch(state) {
+        // Only clear if there's actually a mismatch showing
+        // This prevents race conditions where CLEAR_MISMATCH arrives after cards have already been cleared
+        if (!state.showMismatchFeedback || state.flippedCards.length === 0) {
+            // Nothing to clear - return current state unchanged
+            return {
+                valid: true,
+                newState: state,
+            };
+        }
+        // Clear mismatched cards and feedback
+        return {
+            valid: true,
+            newState: {
+                ...state,
+                flippedCards: [],
+                showMismatchFeedback: false,
+                isProcessingMove: false,
+            },
+        };
+    }
+    /**
+     * STANDARD ARCADE PATTERN: GO_TO_SETUP
+     *
+     * Transitions the game back to setup phase, allowing players to reconfigure
+     * the game. This is synchronized across all room members.
+     *
+     * Can be called from any phase (setup, playing, results).
+     *
+     * PAUSE/RESUME: If called from 'playing' or 'results', saves game state
+     * to allow resuming later (if config unchanged).
+     *
+     * Pattern for all arcade games:
+     * - Validates the move is allowed
+     * - Sets gamePhase to 'setup'
+     * - Preserves current configuration (gameType, difficulty, etc.)
+     * - Saves game state for resume if coming from active game
+     * - Resets game progression state (scores, cards, etc.)
+     */
+    validateGoToSetup(state) {
+        // Determine if we're pausing an active game (for Resume functionality)
+        const isPausingGame = state.gamePhase === 'playing' || state.gamePhase === 'results';
+        return {
+            valid: true,
+            newState: {
+                ...state,
+                gamePhase: 'setup',
+                // Pause/Resume: Save game state if pausing from active game
+                pausedGamePhase: isPausingGame ? state.gamePhase : undefined,
+                pausedGameState: isPausingGame
+                    ? {
+                        gameCards: state.gameCards,
+                        currentPlayer: state.currentPlayer,
+                        matchedPairs: state.matchedPairs,
+                        moves: state.moves,
+                        scores: state.scores,
+                        activePlayers: state.activePlayers,
+                        playerMetadata: state.playerMetadata,
+                        consecutiveMatches: state.consecutiveMatches,
+                        gameStartTime: state.gameStartTime,
+                    }
+                    : undefined,
+                // Keep originalConfig if it exists (was set when game started)
+                // This allows detecting if config changed while paused
+                // Reset visible game progression
+                gameCards: [],
+                cards: [],
+                flippedCards: [],
+                currentPlayer: '',
+                matchedPairs: 0,
+                moves: 0,
+                scores: {},
+                activePlayers: [],
+                playerMetadata: {},
+                consecutiveMatches: {},
+                gameStartTime: null,
+                gameEndTime: null,
+                currentMoveStartTime: null,
+                celebrationAnimations: [],
+                isProcessingMove: false,
+                showMismatchFeedback: false,
+                lastMatchedPair: null,
+                // Preserve configuration - players can modify in setup
+                // gameType, difficulty, turnTimer stay as-is
+            },
+        };
+    }
+    /**
+     * STANDARD ARCADE PATTERN: SET_CONFIG
+     *
+     * Updates a configuration field during setup phase. This is synchronized
+     * across all room members in real-time, allowing collaborative setup.
+     *
+     * Pattern for all arcade games:
+     * - Only allowed during setup phase
+     * - Validates field name and value
+     * - Updates the configuration field
+     * - Other room members see the change immediately (optimistic + server validation)
+     *
+     * @param state Current game state
+     * @param field Configuration field name
+     * @param value New value for the field
+     */
+    validateSetConfig(state, field, value) {
+        // Can only change config during setup phase
+        if (state.gamePhase !== 'setup') {
+            return {
+                valid: false,
+                error: 'Cannot change configuration outside of setup phase',
+            };
+        }
+        // Validate field-specific values
+        switch (field) {
+            case 'gameType':
+                if (value !== 'abacus-numeral' && value !== 'complement-pairs') {
+                    return { valid: false, error: `Invalid gameType: ${value}` };
+                }
+                break;
+            case 'difficulty':
+                if (![6, 8, 12, 15].includes(value)) {
+                    return { valid: false, error: `Invalid difficulty: ${value}` };
+                }
+                break;
+            case 'turnTimer':
+                if (typeof value !== 'number' || value < 5 || value > 300) {
+                    return { valid: false, error: `Invalid turnTimer: ${value}` };
+                }
+                break;
+            default:
+                return { valid: false, error: `Unknown config field: ${field}` };
+        }
+        // PAUSE/RESUME: If there's a paused game and config is changing,
+        // clear the paused game state (can't resume anymore)
+        const clearPausedGame = !!state.pausedGamePhase;
+        // Apply the configuration change
+        return {
+            valid: true,
+            newState: {
+                ...state,
+                [field]: value,
+                // Update totalPairs if difficulty changes
+                ...(field === 'difficulty' ? { totalPairs: value } : {}),
+                // Clear paused game if config changed
+                ...(clearPausedGame
+                    ? { pausedGamePhase: undefined, pausedGameState: undefined, originalConfig: undefined }
+                    : {}),
+            },
+        };
+    }
+    /**
+     * STANDARD ARCADE PATTERN: RESUME_GAME
+     *
+     * Resumes a paused game if configuration hasn't changed.
+     * Restores the saved game state from when GO_TO_SETUP was called.
+     *
+     * Pattern for all arcade games:
+     * - Validates there's a paused game
+     * - Validates config hasn't changed since pause
+     * - Restores game state and phase
+     * - Clears paused game state
+     */
+    validateResumeGame(state) {
+        // Must be in setup phase
+        if (state.gamePhase !== 'setup') {
+            return {
+                valid: false,
+                error: 'Can only resume from setup phase',
+            };
+        }
+        // Must have a paused game
+        if (!state.pausedGamePhase || !state.pausedGameState) {
+            return {
+                valid: false,
+                error: 'No paused game to resume',
+            };
+        }
+        // Config must match original (no changes while paused)
+        if (state.originalConfig) {
+            const configChanged = state.gameType !== state.originalConfig.gameType ||
+                state.difficulty !== state.originalConfig.difficulty ||
+                state.turnTimer !== state.originalConfig.turnTimer;
+            if (configChanged) {
+                return {
+                    valid: false,
+                    error: 'Cannot resume - configuration has changed',
+                };
+            }
+        }
+        // Restore the paused game
+        return {
+            valid: true,
+            newState: {
+                ...state,
+                gamePhase: state.pausedGamePhase,
+                gameCards: state.pausedGameState.gameCards,
+                cards: state.pausedGameState.gameCards,
+                currentPlayer: state.pausedGameState.currentPlayer,
+                matchedPairs: state.pausedGameState.matchedPairs,
+                moves: state.pausedGameState.moves,
+                scores: state.pausedGameState.scores,
+                activePlayers: state.pausedGameState.activePlayers,
+                playerMetadata: state.pausedGameState.playerMetadata,
+                consecutiveMatches: state.pausedGameState.consecutiveMatches,
+                gameStartTime: state.pausedGameState.gameStartTime,
+                // Clear paused state
+                pausedGamePhase: undefined,
+                pausedGameState: undefined,
+                // Keep originalConfig for potential future pauses
+            },
+        };
+    }
+    /**
+     * Validate hover state update for networked presence
+     *
+     * Hover moves are lightweight and always valid - they just update
+     * which card a player is hovering over for UI feedback to other players.
+     */
+    validateHoverCard(state, cardId, playerId) {
+        // Hover is always valid - it's just UI state for networked presence
+        // Update the player's hover state
+        return {
+            valid: true,
+            newState: {
+                ...state,
+                playerHovers: {
+                    ...state.playerHovers,
+                    [playerId]: cardId,
+                },
+            },
+        };
+    }
+    isGameComplete(state) {
+        return state.gamePhase === 'results' || state.matchedPairs === state.totalPairs;
+    }
+    getInitialState(config) {
+        return {
+            cards: [],
+            gameCards: [],
+            flippedCards: [],
+            gameType: config.gameType,
+            difficulty: config.difficulty,
+            turnTimer: config.turnTimer,
+            gamePhase: 'setup',
+            currentPlayer: '',
+            matchedPairs: 0,
+            totalPairs: config.difficulty,
+            moves: 0,
+            scores: {},
+            activePlayers: [],
+            playerMetadata: {}, // Initialize empty player metadata
+            consecutiveMatches: {},
+            gameStartTime: null,
+            gameEndTime: null,
+            currentMoveStartTime: null,
+            timerInterval: null,
+            celebrationAnimations: [],
+            isProcessingMove: false,
+            showMismatchFeedback: false,
+            lastMatchedPair: null,
+            // PAUSE/RESUME: Initialize paused game fields
+            originalConfig: undefined,
+            pausedGamePhase: undefined,
+            pausedGameState: undefined,
+            // HOVER: Initialize hover state
+            playerHovers: {},
+        };
+    }
+}
+exports.MatchingGameValidator = MatchingGameValidator;
+// Singleton instance
+exports.matchingGameValidator = new MatchingGameValidator();
--- a/apps/web/src/lib/arcade/validation/MatchingGameValidator.ts
+++ b/apps/web/src/lib/arcade/validation/MatchingGameValidator.ts
@@ -15,17 +15,38 @@ import { canFlipCard, validateMatch } from '@/app/games/matching/utils/matchVali
 import type { GameValidator, MatchingGameMove, ValidationResult } from './types'

 export class MatchingGameValidator implements GameValidator<MemoryPairsState, MatchingGameMove> {
-  validateMove(state: MemoryPairsState, move: MatchingGameMove): ValidationResult {
+  validateMove(
+    state: MemoryPairsState,
+    move: MatchingGameMove,
+    context?: { userId?: string; playerOwnership?: Record<string, string> }
+  ): ValidationResult {
    switch (move.type) {
      case 'FLIP_CARD':
-        return this.validateFlipCard(state, move.data.cardId, move.playerId)
+        return this.validateFlipCard(state, move.data.cardId, move.playerId, context)

      case 'START_GAME':
-        return this.validateStartGame(state, move.data.activePlayers, move.data.cards)
+        return this.validateStartGame(
+          state,
+          move.data.activePlayers,
+          move.data.cards,
+          move.data.playerMetadata
+        )

      case 'CLEAR_MISMATCH':
        return this.validateClearMismatch(state)

+      case 'GO_TO_SETUP':
+        return this.validateGoToSetup(state)
+
+      case 'SET_CONFIG':
+        return this.validateSetConfig(state, move.data.field, move.data.value)
+
+      case 'RESUME_GAME':
+        return this.validateResumeGame(state)
+
+      case 'HOVER_CARD':
+        return this.validateHoverCard(state, move.data.cardId, move.playerId)
+
      default:
        return {
          valid: false,
@@ -37,7 +58,8 @@ export class MatchingGameValidator implements GameValidator<MemoryPairsState, Ma
  private validateFlipCard(
    state: MemoryPairsState,
    cardId: string,
-    playerId: string
+    playerId: string,
+    context?: { userId?: string; playerOwnership?: Record<string, string> }
  ): ValidationResult {
    // Game must be in playing phase
    if (state.gamePhase !== 'playing') {
@@ -63,6 +85,22 @@ export class MatchingGameValidator implements GameValidator<MemoryPairsState, Ma
      }
    }

+    // Check player ownership authorization (if context provided)
+    if (context?.userId && context?.playerOwnership) {
+      const playerOwner = context.playerOwnership[playerId]
+      if (playerOwner && playerOwner !== context.userId) {
+        console.log('[Validator] Player ownership check failed:', {
+          playerId,
+          playerOwner,
+          requestingUserId: context.userId,
+        })
+        return {
+          valid: false,
+          error: 'You can only move your own players',
+        }
+      }
+    }
+
    // Find the card
    const card = state.gameCards.find((c) => c.id === cardId)
    if (!card) {
@@ -162,7 +200,8 @@ export class MatchingGameValidator implements GameValidator<MemoryPairsState, Ma
  private validateStartGame(
    state: MemoryPairsState,
    activePlayers: Player[],
-    cards?: GameCard[]
+    cards?: GameCard[],
+    playerMetadata?: { [playerId: string]: any }
  ): ValidationResult {
    // Allow starting a new game from any phase (for "New Game" button)

@@ -182,6 +221,7 @@ export class MatchingGameValidator implements GameValidator<MemoryPairsState, Ma
      gameCards,
      cards: gameCards,
      activePlayers,
+      playerMetadata: playerMetadata || {}, // Store player metadata for cross-user visibility
      gamePhase: 'playing',
      gameStartTime: Date.now(),
      currentPlayer: activePlayers[0],
@@ -190,6 +230,15 @@ export class MatchingGameValidator implements GameValidator<MemoryPairsState, Ma
      moves: 0,
      scores: activePlayers.reduce((acc, p) => ({ ...acc, [p]: 0 }), {}),
      consecutiveMatches: activePlayers.reduce((acc, p) => ({ ...acc, [p]: 0 }), {}),
+      // PAUSE/RESUME: Save original config so we can detect changes
+      originalConfig: {
+        gameType: state.gameType,
+        difficulty: state.difficulty,
+        turnTimer: state.turnTimer,
+      },
+      // Clear any paused game state (starting fresh)
+      pausedGamePhase: undefined,
+      pausedGameState: undefined,
    }

    return {
@@ -199,6 +248,16 @@ export class MatchingGameValidator implements GameValidator<MemoryPairsState, Ma
  }

  private validateClearMismatch(state: MemoryPairsState): ValidationResult {
+    // Only clear if there's actually a mismatch showing
+    // This prevents race conditions where CLEAR_MISMATCH arrives after cards have already been cleared
+    if (!state.showMismatchFeedback || state.flippedCards.length === 0) {
+      // Nothing to clear - return current state unchanged
+      return {
+        valid: true,
+        newState: state,
+      }
+    }
+
    // Clear mismatched cards and feedback
    return {
      valid: true,
@@ -211,6 +270,243 @@ export class MatchingGameValidator implements GameValidator<MemoryPairsState, Ma
    }
  }

+  /**
+   * STANDARD ARCADE PATTERN: GO_TO_SETUP
+   *
+   * Transitions the game back to setup phase, allowing players to reconfigure
+   * the game. This is synchronized across all room members.
+   *
+   * Can be called from any phase (setup, playing, results).
+   *
+   * PAUSE/RESUME: If called from 'playing' or 'results', saves game state
+   * to allow resuming later (if config unchanged).
+   *
+   * Pattern for all arcade games:
+   * - Validates the move is allowed
+   * - Sets gamePhase to 'setup'
+   * - Preserves current configuration (gameType, difficulty, etc.)
+   * - Saves game state for resume if coming from active game
+   * - Resets game progression state (scores, cards, etc.)
+   */
+  private validateGoToSetup(state: MemoryPairsState): ValidationResult {
+    // Determine if we're pausing an active game (for Resume functionality)
+    const isPausingGame = state.gamePhase === 'playing' || state.gamePhase === 'results'
+
+    return {
+      valid: true,
+      newState: {
+        ...state,
+        gamePhase: 'setup',
+
+        // Pause/Resume: Save game state if pausing from active game
+        pausedGamePhase: isPausingGame ? state.gamePhase : undefined,
+        pausedGameState: isPausingGame
+          ? {
+              gameCards: state.gameCards,
+              currentPlayer: state.currentPlayer,
+              matchedPairs: state.matchedPairs,
+              moves: state.moves,
+              scores: state.scores,
+              activePlayers: state.activePlayers,
+              playerMetadata: state.playerMetadata,
+              consecutiveMatches: state.consecutiveMatches,
+              gameStartTime: state.gameStartTime,
+            }
+          : undefined,
+
+        // Keep originalConfig if it exists (was set when game started)
+        // This allows detecting if config changed while paused
+
+        // Reset visible game progression
+        gameCards: [],
+        cards: [],
+        flippedCards: [],
+        currentPlayer: '',
+        matchedPairs: 0,
+        moves: 0,
+        scores: {},
+        activePlayers: [],
+        playerMetadata: {},
+        consecutiveMatches: {},
+        gameStartTime: null,
+        gameEndTime: null,
+        currentMoveStartTime: null,
+        celebrationAnimations: [],
+        isProcessingMove: false,
+        showMismatchFeedback: false,
+        lastMatchedPair: null,
+        // Preserve configuration - players can modify in setup
+        // gameType, difficulty, turnTimer stay as-is
+      },
+    }
+  }
+
+  /**
+   * STANDARD ARCADE PATTERN: SET_CONFIG
+   *
+   * Updates a configuration field during setup phase. This is synchronized
+   * across all room members in real-time, allowing collaborative setup.
+   *
+   * Pattern for all arcade games:
+   * - Only allowed during setup phase
+   * - Validates field name and value
+   * - Updates the configuration field
+   * - Other room members see the change immediately (optimistic + server validation)
+   *
+   * @param state Current game state
+   * @param field Configuration field name
+   * @param value New value for the field
+   */
+  private validateSetConfig(
+    state: MemoryPairsState,
+    field: 'gameType' | 'difficulty' | 'turnTimer',
+    value: any
+  ): ValidationResult {
+    // Can only change config during setup phase
+    if (state.gamePhase !== 'setup') {
+      return {
+        valid: false,
+        error: 'Cannot change configuration outside of setup phase',
+      }
+    }
+
+    // Validate field-specific values
+    switch (field) {
+      case 'gameType':
+        if (value !== 'abacus-numeral' && value !== 'complement-pairs') {
+          return { valid: false, error: `Invalid gameType: ${value}` }
+        }
+        break
+
+      case 'difficulty':
+        if (![6, 8, 12, 15].includes(value)) {
+          return { valid: false, error: `Invalid difficulty: ${value}` }
+        }
+        break
+
+      case 'turnTimer':
+        if (typeof value !== 'number' || value < 5 || value > 300) {
+          return { valid: false, error: `Invalid turnTimer: ${value}` }
+        }
+        break
+
+      default:
+        return { valid: false, error: `Unknown config field: ${field}` }
+    }
+
+    // PAUSE/RESUME: If there's a paused game and config is changing,
+    // clear the paused game state (can't resume anymore)
+    const clearPausedGame = !!state.pausedGamePhase
+
+    // Apply the configuration change
+    return {
+      valid: true,
+      newState: {
+        ...state,
+        [field]: value,
+        // Update totalPairs if difficulty changes
+        ...(field === 'difficulty' ? { totalPairs: value } : {}),
+        // Clear paused game if config changed
+        ...(clearPausedGame
+          ? { pausedGamePhase: undefined, pausedGameState: undefined, originalConfig: undefined }
+          : {}),
+      },
+    }
+  }
+
+  /**
+   * STANDARD ARCADE PATTERN: RESUME_GAME
+   *
+   * Resumes a paused game if configuration hasn't changed.
+   * Restores the saved game state from when GO_TO_SETUP was called.
+   *
+   * Pattern for all arcade games:
+   * - Validates there's a paused game
+   * - Validates config hasn't changed since pause
+   * - Restores game state and phase
+   * - Clears paused game state
+   */
+  private validateResumeGame(state: MemoryPairsState): ValidationResult {
+    // Must be in setup phase
+    if (state.gamePhase !== 'setup') {
+      return {
+        valid: false,
+        error: 'Can only resume from setup phase',
+      }
+    }
+
+    // Must have a paused game
+    if (!state.pausedGamePhase || !state.pausedGameState) {
+      return {
+        valid: false,
+        error: 'No paused game to resume',
+      }
+    }
+
+    // Config must match original (no changes while paused)
+    if (state.originalConfig) {
+      const configChanged =
+        state.gameType !== state.originalConfig.gameType ||
+        state.difficulty !== state.originalConfig.difficulty ||
+        state.turnTimer !== state.originalConfig.turnTimer
+
+      if (configChanged) {
+        return {
+          valid: false,
+          error: 'Cannot resume - configuration has changed',
+        }
+      }
+    }
+
+    // Restore the paused game
+    return {
+      valid: true,
+      newState: {
+        ...state,
+        gamePhase: state.pausedGamePhase,
+        gameCards: state.pausedGameState.gameCards,
+        cards: state.pausedGameState.gameCards,
+        currentPlayer: state.pausedGameState.currentPlayer,
+        matchedPairs: state.pausedGameState.matchedPairs,
+        moves: state.pausedGameState.moves,
+        scores: state.pausedGameState.scores,
+        activePlayers: state.pausedGameState.activePlayers,
+        playerMetadata: state.pausedGameState.playerMetadata,
+        consecutiveMatches: state.pausedGameState.consecutiveMatches,
+        gameStartTime: state.pausedGameState.gameStartTime,
+        // Clear paused state
+        pausedGamePhase: undefined,
+        pausedGameState: undefined,
+        // Keep originalConfig for potential future pauses
+      },
+    }
+  }
+
+  /**
+   * Validate hover state update for networked presence
+   *
+   * Hover moves are lightweight and always valid - they just update
+   * which card a player is hovering over for UI feedback to other players.
+   */
+  private validateHoverCard(
+    state: MemoryPairsState,
+    cardId: string | null,
+    playerId: string
+  ): ValidationResult {
+    // Hover is always valid - it's just UI state for networked presence
+    // Update the player's hover state
+    return {
+      valid: true,
+      newState: {
+        ...state,
+        playerHovers: {
+          ...state.playerHovers,
+          [playerId]: cardId,
+        },
+      },
+    }
+  }
+
  isGameComplete(state: MemoryPairsState): boolean {
    return state.gamePhase === 'results' || state.matchedPairs === state.totalPairs
  }
@@ -234,6 +530,7 @@ export class MatchingGameValidator implements GameValidator<MemoryPairsState, Ma
      moves: 0,
      scores: {},
      activePlayers: [],
+      playerMetadata: {}, // Initialize empty player metadata
      consecutiveMatches: {},
      gameStartTime: null,
      gameEndTime: null,
@@ -243,6 +540,12 @@ export class MatchingGameValidator implements GameValidator<MemoryPairsState, Ma
      isProcessingMove: false,
      showMismatchFeedback: false,
      lastMatchedPair: null,
+      // PAUSE/RESUME: Initialize paused game fields
+      originalConfig: undefined,
+      pausedGamePhase: undefined,
+      pausedGameState: undefined,
+      // HOVER: Initialize hover state
+      playerHovers: {},
    }
  }
 }
--- a/apps/web/src/lib/arcade/validation/index.js
+++ b/apps/web/src/lib/arcade/validation/index.js
@@ -0,0 +1,37 @@
+"use strict";
+/**
+ * Game validator registry
+ * Maps game names to their validators
+ */
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    var desc = Object.getOwnPropertyDescriptor(m, k);
+    if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
+      desc = { enumerable: true, get: function() { return m[k]; } };
+    }
+    Object.defineProperty(o, k2, desc);
+}) : (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    o[k2] = m[k];
+}));
+var __exportStar = (this && this.__exportStar) || function(m, exports) {
+    for (var p in m) if (p !== "default" && !Object.prototype.hasOwnProperty.call(exports, p)) __createBinding(exports, m, p);
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.matchingGameValidator = void 0;
+exports.getValidator = getValidator;
+const MatchingGameValidator_1 = require("./MatchingGameValidator");
+const validators = new Map([
+    ['matching', MatchingGameValidator_1.matchingGameValidator],
+    // Add other game validators here as they're implemented
+]);
+function getValidator(gameName) {
+    const validator = validators.get(gameName);
+    if (!validator) {
+        throw new Error(`No validator found for game: ${gameName}`);
+    }
+    return validator;
+}
+var MatchingGameValidator_2 = require("./MatchingGameValidator");
+Object.defineProperty(exports, "matchingGameValidator", { enumerable: true, get: function () { return MatchingGameValidator_2.matchingGameValidator; } });
+__exportStar(require("./types"), exports);
--- a/apps/web/src/lib/arcade/validation/types.js
+++ b/apps/web/src/lib/arcade/validation/types.js
@@ -0,0 +1,6 @@
+"use strict";
+/**
+ * Isomorphic game validation types
+ * Used on both client and server for arcade session validation
+ */
+Object.defineProperty(exports, "__esModule", { value: true });
--- a/apps/web/src/lib/arcade/validation/types.ts
+++ b/apps/web/src/lib/arcade/validation/types.ts
@@ -33,6 +33,7 @@ export interface MatchingStartGameMove extends GameMove {
  data: {
    activePlayers: string[] // Player IDs (UUIDs)
    cards?: any[] // GameCard type from context
+    playerMetadata?: { [playerId: string]: any } // Player metadata for cross-user visibility
  }
 }

@@ -41,22 +42,63 @@ export interface MatchingClearMismatchMove extends GameMove {
  data: Record<string, never>
 }

+// Standard setup moves - pattern for all arcade games
+export interface MatchingGoToSetupMove extends GameMove {
+  type: 'GO_TO_SETUP'
+  data: Record<string, never>
+}
+
+export interface MatchingSetConfigMove extends GameMove {
+  type: 'SET_CONFIG'
+  data: {
+    field: 'gameType' | 'difficulty' | 'turnTimer'
+    value: any
+  }
+}
+
+export interface MatchingResumeGameMove extends GameMove {
+  type: 'RESUME_GAME'
+  data: Record<string, never>
+}
+
+export interface MatchingHoverCardMove extends GameMove {
+  type: 'HOVER_CARD'
+  data: {
+    cardId: string | null // null when mouse leaves card
+  }
+}
+
 export type MatchingGameMove =
  | MatchingFlipCardMove
  | MatchingStartGameMove
  | MatchingClearMismatchMove
+  | MatchingGoToSetupMove
+  | MatchingSetConfigMove
+  | MatchingResumeGameMove
+  | MatchingHoverCardMove

 // Generic game state union
 export type GameState = MemoryPairsState // Add other game states as union later

+/**
+ * Validation context for authorization checks
+ */
+export interface ValidationContext {
+  userId?: string
+  playerOwnership?: Record<string, string> // playerId -> userId mapping
+}
+
 /**
 * Base validator interface that all games must implement
 */
 export interface GameValidator<TState = unknown, TMove extends GameMove = GameMove> {
  /**
   * Validate a game move and return the new state if valid
+   * @param state Current game state
+   * @param move The move to validate
+   * @param context Optional validation context for authorization checks
   */
-  validateMove(state: TState, move: TMove): ValidationResult
+  validateMove(state: TState, move: TMove, context?: ValidationContext): ValidationResult

  /**
   * Check if the game is in a terminal state (completed)
--- a/apps/web/tsconfig.server.json
+++ b/apps/web/tsconfig.server.json
@@ -0,0 +1,33 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "module": "commonjs",
+    "target": "es2020",
+    "outDir": ".",
+    "rootDir": ".",
+    "noEmit": false,
+    "incremental": false,
+    "skipLibCheck": true,
+    "skipDefaultLibCheck": true,
+    "esModuleInterop": true,
+    "resolveJsonModule": true,
+    "moduleResolution": "node",
+    "types": ["node", "react"]
+  },
+  "include": [
+    "src/db/index.ts",
+    "src/db/schema.ts",
+    "src/db/migrate.ts",
+    "src/lib/arcade/**/*.ts",
+    "src/app/games/matching/context/types.ts",
+    "src/app/games/matching/utils/cardGeneration.ts",
+    "src/app/games/matching/utils/matchValidation.ts",
+    "socket-server.ts"
+  ],
+  "exclude": [
+    "node_modules",
+    "**/*.test.ts",
+    "**/*.test.tsx",
+    "**/*.spec.ts"
+  ]
+}
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
  "name": "soroban-monorepo",
-  "version": "2.7.3",
+  "version": "2.16.7",
  "private": true,
  "description": "Beautiful Soroban Flashcard Generator - Monorepo",
  "workspaces": [
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -240,6 +240,9 @@ importers:
      storybook:
        specifier: ^9.1.7
        version: 9.1.10(@testing-library/dom@9.3.4)(prettier@3.6.2)(vite@5.4.20(@types/node@20.19.19)(terser@5.44.0))
+      tsc-alias:
+        specifier: ^1.8.16
+        version: 1.8.16
      tsx:
        specifier: ^4.20.5
        version: 4.20.6
@@ -4679,6 +4682,10 @@ packages:
    resolution: {integrity: sha512-OkTL9umf+He2DZkUq8f8J9of7yL6RJKI24dVITBmNfZBmri9zYZQrKkuXiKhyfPSu8tUhnVBB1iKXevvnlR4Ww==}
    engines: {node: '>= 12'}

+  commander@9.5.0:
+    resolution: {integrity: sha512-KRs7WVDKg86PWiuAqhDrAQnTXZKraVcCc6vFdL14qrZ/DcWwuRo7VoiYXalXO7S5GKpqYiVEwCbgFDfxNHKJBQ==}
+    engines: {node: ^12.20.0 || >=14}
+
  common-path-prefix@3.0.0:
    resolution: {integrity: sha512-QE33hToZseCH3jS0qN96O/bSh3kaw/h+Tq7ngyY9eWDUnTlTNUyqfqvCXioLe5Na5jFsL78ra/wuBU4iuEgd4w==}

@@ -6937,6 +6944,10 @@ packages:
  ms@2.1.3:
    resolution: {integrity: sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==}

+  mylas@2.1.13:
+    resolution: {integrity: sha512-+MrqnJRtxdF+xngFfUUkIMQrUUL0KsxbADUkn23Z/4ibGg192Q+z+CQyiYwvWTsYjJygmMR8+w3ZDa98Zh6ESg==}
+    engines: {node: '>=12.0.0'}
+
  mz@2.7.0:
    resolution: {integrity: sha512-z81GNO7nnYMEhrGh9LeymoE4+Yr0Wn5McHIZMK5cfQCl+NDX08sCZgUc9/6MHni9IWuFLm1Z3HTCXu2z9fN62Q==}

@@ -7508,6 +7519,10 @@ packages:
    engines: {node: '>=18'}
    hasBin: true

+  plimit-lit@1.6.1:
+    resolution: {integrity: sha512-B7+VDyb8Tl6oMJT9oSO2CW8XC/T4UcJGrwOVoNGwOQsQYhlpfajmrMj5xeejqaASq3V/EqThyOeATEOMuSEXiA==}
+    engines: {node: '>=12'}
+
  pluralize@8.0.0:
    resolution: {integrity: sha512-Nc3IT5yHzflTfbjgqWcCPpo7DaKy4FnpB0l/zCAW0Tc7jxAiuqSxHasntB3D7887LSrA93kDJ9IXovxJYxyLCA==}
    engines: {node: '>=4'}
@@ -7744,6 +7759,10 @@ packages:
    resolution: {integrity: sha512-773xhDQnZBMFobEiztv8LIl70ch5MSF/jUQVlhwFyBILqq96anmoctVIYz+ZRp0qbCKATTn6ev02M3r7Ga5vqA==}
    engines: {node: '>=0.4.x'}

+  queue-lit@1.5.2:
+    resolution: {integrity: sha512-tLc36IOPeMAubu8BkW8YDBV+WyIgKlYU7zUNs0J5Vk9skSZ4JfGlPOqplP0aHdfv7HL0B2Pg6nwiq60Qc6M2Hw==}
+    engines: {node: '>=12'}
+
  queue-microtask@1.2.3:
    resolution: {integrity: sha512-NuaNSa6flKT5JaSYQzJok04JzTL1CA6aGhv5rfLW3PgqA+M2ChpZQnAC8h8i4ZFkBS8X5RqkDBHA7r4hej3K9A==}

@@ -8702,6 +8721,11 @@ packages:
  ts-pattern@5.0.5:
    resolution: {integrity: sha512-tL0w8U/pgaacOmkb9fRlYzWEUDCfVjjv9dD4wHTgZ61MjhuMt46VNWTG747NqW6vRzoWIKABVhFSOJ82FvXrfA==}

+  tsc-alias@1.8.16:
+    resolution: {integrity: sha512-QjCyu55NFyRSBAl6+MTFwplpFcnm2Pq01rR/uxfqJoLMm6X3O14KEGtaSDZpJYaE1bJBGDjD0eSuiIWPe2T58g==}
+    engines: {node: '>=16.20.2'}
+    hasBin: true
+
  tsconfck@2.1.2:
    resolution: {integrity: sha512-ghqN1b0puy3MhhviwO2kGF8SeMDNhEbnKxjK7h6+fvY9JAxqvXi8y5NAHSQv687OVboS2uZIByzGd45/YxrRHg==}
    engines: {node: ^14.13.1 || ^16 || >=18}
@@ -14271,6 +14295,8 @@ snapshots:

  commander@8.3.0: {}

+  commander@9.5.0: {}
+
  common-path-prefix@3.0.0: {}

  commondir@1.0.1: {}
@@ -16834,6 +16860,8 @@ snapshots:

  ms@2.1.3: {}

+  mylas@2.1.13: {}
+
  mz@2.7.0:
    dependencies:
      any-promise: 1.3.0
@@ -17334,6 +17362,10 @@ snapshots:
    optionalDependencies:
      fsevents: 2.3.2

+  plimit-lit@1.6.1:
+    dependencies:
+      queue-lit: 1.5.2
+
  pluralize@8.0.0: {}

  polished@4.3.1:
@@ -17583,6 +17615,8 @@ snapshots:

  querystring-es3@0.2.1: {}

+  queue-lit@1.5.2: {}
+
  queue-microtask@1.2.3: {}

  ramda@0.29.0: {}
@@ -18698,6 +18732,16 @@ snapshots:

  ts-pattern@5.0.5: {}

+  tsc-alias@1.8.16:
+    dependencies:
+      chokidar: 3.6.0
+      commander: 9.5.0
+      get-tsconfig: 4.11.0
+      globby: 11.1.0
+      mylas: 2.1.13
+      normalize-path: 3.0.0
+      plimit-lit: 1.6.1
+
  tsconfck@2.1.2(typescript@5.9.3):
    optionalDependencies:
      typescript: 5.9.3