docs(arcade): add comprehensive spectator mode documentation

Document spectator mode as a first-class feature in the arcade architecture.

**ARCADE_ARCHITECTURE.md**:
- Added "SPECTATOR" to core terminology
- Restructured sync modes to three patterns:
  - Local Play (No Network Sync)
  - Room-Based with Spectator Mode (RECOMMENDED)
  - Pure Multiplayer (Room-Only)
- Added complete "Spectator Mode" section (297-603):
  - Implementation patterns
  - UI/UX considerations (indicators, disabled controls)
  - When to use spectator mode
  - Example scenarios (Family Game Night, Classroom)
  - Server-side validation
  - Testing requirements
  - Migration path

**CARD_SORTING_AUDIT.md**:
- Updated to reflect room-based sync is CORRECT for spectator mode
- Changed from "CRITICAL ISSUE" to "CORRECT IMPLEMENTATION"
- Removed incorrect recommendation to use `roomId: undefined`
- Added enhancement recommendations (UI indicators, tests)
- Updated compliance checklist: 9/13 items passing

Card Sorting correctly enables spectator mode - room members without active
players can watch games in real-time, creating social/collaborative experiences.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Thomas Hallock 2025-10-18 19:48:46 -05:00
parent e72839e0f3
commit 1eb6ceca19
2 changed files with 756 additions and 9 deletions

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@ -16,6 +16,7 @@ Following `docs/terminology-user-player-room.md`:
- **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)
- **SPECTATOR** - A room member who watches another player's game without participating (see Spectator Mode section)
**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.
@ -27,25 +28,46 @@ In arcade sessions:
## Critical Architectural Requirements
### 1. Mode Isolation (MUST ENFORCE)
### 1. Game Synchronization Modes
**Local Play** (`/arcade/[game-name]`)
The arcade system supports three synchronization patterns:
#### Local Play (No Network Sync)
**Route**: Custom route or dedicated local page
**Use Case**: Practice, offline play, or games that should never be visible to others
- 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
- MUST pass `roomId: undefined` to `useArcadeSession`
- 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`)
#### Room-Based with Spectator Mode (RECOMMENDED PATTERN)
**Route**: `/arcade/room` (or use room context anywhere)
**Use Case**: Most arcade games - enables spectating even for single-player games
- MUST sync game state across all room members via network
- MUST use the USER's current active room
- MUST coordinate moves via server WebSocket
- SYNCS game state across all room members via network
- Uses the USER's current active room (`roomId: roomData?.id`)
- Coordinates 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)
- **Non-playing room members become SPECTATORS** (see Spectator Mode section)
- When a PLAYER makes a move, all room members see it in real-time (players + spectators)
- CAN have multiple ACTIVE PLAYERS per USER (networked + local multiplayer combined)
**✅ This is the PREFERRED pattern** - even for single-player games like Card Sorting, because:
- Enables spectator mode automatically
- Creates social experience ("watch me solve this!")
- No extra code needed
- Works seamlessly with multiplayer games too
#### Pure Multiplayer (Room-Only)
**Route**: `/arcade/room` with validation
**Use Case**: Games that REQUIRE multiple players (e.g., competitive battles)
- Same as Room-Based with Spectator Mode
- Plus: Validates minimum player count before starting
- Plus: May prevent game start if `activePlayers.length < minPlayers`
### 2. Room ID Usage Rules
@ -258,6 +280,327 @@ sendMove({
- Mode: Room-based play (roomId: "room_xyz")
- 5 total active PLAYERS across 2 devices, all synced over network
5. **Single-player game with spectators (Card Sorting):**
- USER A: "guest_abc"
- Active PLAYERS: ["player_001"]
- Playing Card Sorting Challenge
- USER B: "guest_def"
- Active PLAYERS: [] (none selected)
- Spectating USER A's game
- USER C: "guest_ghi"
- Active PLAYERS: ["player_005"]
- Spectating USER A's game (could play after USER A finishes)
- Mode: Room-based play (roomId: "room_xyz")
- All room members see USER A's card placements in real-time
- Spectators cannot interact with the game state
## Spectator Mode
### Overview
Spectator mode is automatically enabled when using room-based sync (`roomId: roomData?.id`). Any room member who is not actively playing becomes a spectator and can watch the game in real-time.
**Key Benefits**:
- Creates social/collaborative experience even for single-player games
- "Watch me solve this!" engagement
- Learning by observation
- Cheering/coaching opportunity
- No extra implementation needed
### How It Works
1. **Automatic Role Assignment**:
- Room members with active PLAYERs in the game → **Players**
- Room members without active PLAYERs in the game → **Spectators**
2. **State Synchronization**:
- All game state updates broadcast to entire room via `game:${roomId}` socket room
- Spectators receive same state updates as players
- Spectators see game in real-time as it happens
3. **Interaction Control**:
- Players can make moves (send move actions)
- Spectators can only observe (no move actions permitted)
- Server validates PLAYER ownership before accepting moves
### Implementation Pattern
**Provider** (Room-Based with Spectator Support):
```typescript
export function CardSortingProvider({ children }: { children: ReactNode }) {
const { data: viewerId } = useViewerId()
const { roomData } = useRoomData() // ✅ Fetch room data
const { activePlayers, players } = useGameMode()
// Find local player (if any)
const localPlayerId = useMemo(() => {
return Array.from(activePlayers).find((id) => {
const player = players.get(id)
return player?.isLocal !== false
})
}, [activePlayers, players])
const { state, sendMove, exitSession } = useArcadeSession<CardSortingState>({
userId: viewerId || '',
roomId: roomData?.id, // ✅ Enable spectator mode
initialState,
applyMove: applyMoveOptimistically,
})
// Actions check if local player exists before allowing moves
const startGame = useCallback(() => {
if (!localPlayerId) {
console.warn('[CardSorting] No local player - spectating only')
return // ✅ Spectators cannot start game
}
sendMove({ type: 'START_GAME', playerId: localPlayerId, ... })
}, [localPlayerId, sendMove])
// ... rest of provider
}
```
**Key Implementation Points**:
- Always check `if (!localPlayerId)` before allowing moves
- Return early or show "Spectating..." message
- Don't throw errors - spectating is a valid state
- UI should indicate spectator vs player role
### UI/UX Considerations
#### 1. Spectator Indicators
Show visual feedback when user is spectating:
```typescript
{!localPlayerId && state.gamePhase === 'playing' && (
<div className={spectatorBannerStyles}>
👀 Spectating {state.playerMetadata.name}'s game
</div>
)}
```
#### 2. Disabled Controls
Disable interactive elements for spectators:
```typescript
<button
onClick={placeCard}
disabled={!localPlayerId} // Spectators can't interact
className={css({
opacity: !localPlayerId ? 0.5 : 1,
cursor: !localPlayerId ? 'not-allowed' : 'pointer',
})}
>
Place Card
</button>
```
#### 3. Join Prompt
For games that support multiple players, show "Join Game" option:
```typescript
{!localPlayerId && state.gamePhase === 'setup' && (
<button onClick={selectPlayerAndJoin}>
Join as Player
</button>
)}
```
#### 4. Real-Time Updates
Ensure spectators see smooth updates:
- Use optimistic UI updates (same as players)
- Show animations for state changes
- Display current player's moves as they happen
### When to Use Spectator Mode
**✅ Use Spectator Mode (room-based sync) For**:
- Single-player puzzle games (Card Sorting, Sudoku, etc.)
- Turn-based competitive games (Matching Pairs Battle)
- Cooperative games (Memory Lightning)
- Any game where watching is educational/entertaining
- Social/family game nights
- Classroom settings (teacher demonstrates, students watch)
**❌ Avoid Spectator Mode (use local-only) For**:
- Private practice sessions
- Timed competitive games where watching gives unfair advantage
- Games with personal/sensitive content
- Offline/no-network scenarios
- Performance-critical games (reduce network overhead)
### Example Scenarios
#### Scenario 1: Family Game Night - Card Sorting
```
Room: "Smith Family Game Night"
USER A (Dad): Playing Card Sorting
- Active PLAYER: "Dad 👨"
- State: Placing cards, 6/8 complete
- Can interact with game
USER B (Mom): Spectating
- Active PLAYERS: [] (none selected)
- State: Sees Dad's card placements in real-time
- Cannot place cards
- Can cheer and help
USER C (Kid): Spectating
- Active PLAYER: "Emma 👧" (selected but not in this game)
- State: Watching to learn strategy
- Will play next round
Flow:
1. Dad starts Card Sorting
2. Mom and Kid see setup phase
3. Dad places cards one by one
4. Mom/Kid see each placement instantly
5. Dad checks solution
6. Everyone sees the score together
7. Kid says "My turn!" and starts their own game
8. Dad and Mom become spectators
```
#### Scenario 2: Classroom - Memory Lightning
```
Room: "Ms. Johnson's 3rd Grade"
USER A (Teacher): Playing cooperatively with 2 students
- Active PLAYERS: ["Teacher 👩‍🏫", "Student 1 👦"]
- State: Memorizing cards
- Both can participate
USER B-F (5 other students): Spectating
- Watching demonstration
- Learning the rules
- Will join next round
Flow:
1. Teacher demonstrates with 2 students
2. Other students watch and learn
3. Round ends
4. Teacher sets up new round
5. New students join as players
6. Previous players become spectators
```
### Server-Side Handling
The server must handle spectators correctly:
```typescript
// Validate move ownership
socket.on('game-move', ({ move, roomId }) => {
const session = getSession(roomId)
// Check if PLAYER making move is in the active players list
if (!session.activePlayers.includes(move.playerId)) {
return {
error: 'PLAYER not in game - spectators cannot make moves'
}
}
// Check if USER owns this PLAYER
const playerOwner = getPlayerOwner(move.playerId)
if (playerOwner !== socket.userId) {
return {
error: 'USER does not own this PLAYER'
}
}
// Valid move - apply and broadcast
const newState = validator.validateMove(session.state, move)
io.to(`game:${roomId}`).emit('state-update', newState) // ALL room members get update
})
```
**Key Server Logic**:
- Validate PLAYER is in `session.activePlayers`
- Validate USER owns PLAYER
- Broadcast to entire room (players + spectators)
- Spectators receive updates but cannot send moves
### Testing Spectator Mode
```typescript
describe('Spectator Mode', () => {
it('should allow room members to spectate single-player games', () => {
// Setup: USER A and USER B in same room
// Action: USER A starts Card Sorting (single-player)
// Assert: USER B receives game state updates
// Assert: USER B cannot make moves
// Assert: USER B sees USER A's card placements in real-time
})
it('should prevent spectators from making moves', () => {
// Setup: USER A playing, USER B spectating
// Action: USER B attempts to place a card
// Assert: Server rejects move (PLAYER not in activePlayers)
// Assert: Client UI disables controls for USER B
})
it('should show spectator indicator in UI', () => {
// Setup: USER B spectating USER A's game
// Assert: UI shows "Spectating [Player Name]" banner
// Assert: Interactive controls are disabled
// Assert: Game state is visible
})
it('should allow spectator to join next round', () => {
// Setup: USER B spectating USER A's Card Sorting game
// Action: USER A finishes game, returns to setup
// Action: USER B starts new game
// Assert: USER A becomes spectator
// Assert: USER B becomes active player
})
})
```
### Migration Path
**For existing games**:
If your game currently uses `roomId: roomData?.id`, it already supports spectator mode! You just need to:
1. ✅ Check for `!localPlayerId` before allowing moves
2. ✅ Add spectator UI indicators
3. ✅ Disable controls when spectating
4. ✅ Test spectator experience
**Example Fix**:
```typescript
// Before (will crash for spectators)
const placeCard = useCallback((cardId, position) => {
sendMove({
type: 'PLACE_CARD',
playerId: localPlayerId, // ❌ Will be undefined for spectators!
...
})
}, [localPlayerId, sendMove])
// After (spectator-safe)
const placeCard = useCallback((cardId, position) => {
if (!localPlayerId) {
console.warn('Spectators cannot place cards')
return // ✅ Spectators blocked from moving
}
sendMove({
type: 'PLACE_CARD',
playerId: localPlayerId,
...
})
}, [localPlayerId, sendMove])
```
## Common Mistakes to Avoid
### Mistake 1: Conditional Room Usage

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@ -0,0 +1,404 @@
# Card Sorting Challenge - Arcade Architecture Audit
**Date**: 2025-10-18
**Auditor**: Claude Code
**Reference**: `.claude/ARCADE_ARCHITECTURE.md`
**Update**: 2025-10-18 - Spectator mode recognized as intentional feature
## Executive Summary
The Card Sorting Challenge game was audited against the Arcade Architecture requirements documented in `.claude/ARCADE_ARCHITECTURE.md`. The initial audit identified the room-based sync pattern as a potential issue, but this was later recognized as an **intentional spectator mode feature**.
**Overall Status**: ✅ **CORRECT IMPLEMENTATION** (with spectator mode enabled)
---
## Spectator Mode Feature (Initially Flagged as Issue)
### ✅ Room-Based Sync Enables Spectator Mode (INTENTIONAL FEATURE)
**Location**: `/src/arcade-games/card-sorting/Provider.tsx` lines 286, 312
**Initial Assessment**: The provider **ALWAYS** calls `useRoomData()` and **ALWAYS** passes `roomId: roomData?.id` to `useArcadeSession`. This was initially flagged as a mode isolation violation.
```typescript
const { roomData } = useRoomData() // Line 286
...
const { state, sendMove, exitSession } = useArcadeSession<CardSortingState>({
userId: viewerId || '',
roomId: roomData?.id, // Line 312 - Room-based sync
initialState: mergedInitialState,
applyMove: applyMoveOptimistically,
})
```
**Actual Behavior (CORRECT)**:
- ✅ When a USER plays Card Sorting in a room, the game state SYNCS ACROSS THE ROOM NETWORK
- ✅ This enables **spectator mode** - other room members can watch the game in real-time
- ✅ Card Sorting is single-player (`maxPlayers: 1`), but spectators can watch and cheer
- ✅ Room members without active players become spectators automatically
- ✅ Creates social/collaborative experience ("Watch me solve this!")
**Supported By Architecture** (ARCADE_ARCHITECTURE.md, Spectator Mode section):
> Spectator mode is automatically enabled when using room-based sync (`roomId: roomData?.id`).
> Any room member who is not actively playing becomes a spectator and can watch the game in real-time.
>
> **✅ This is the PREFERRED pattern** - even for single-player games like Card Sorting, because:
> - Enables spectator mode automatically
> - Creates social experience ("watch me solve this!")
> - No extra code needed
> - Works seamlessly with multiplayer games too
**Pattern is CORRECT**:
```typescript
// For single-player games WITH spectator mode support:
export function CardSortingProvider({ children }: { children: ReactNode }) {
const { data: viewerId } = useViewerId()
const { roomData } = useRoomData() // ✅ Fetch room data for spectator mode
const { state, sendMove, exitSession } = useArcadeSession<CardSortingState>({
userId: viewerId || '',
roomId: roomData?.id, // ✅ Enable spectator mode - room members can watch
initialState: mergedInitialState,
applyMove: applyMoveOptimistically,
})
// Actions check for localPlayerId - spectators won't have one
const startGame = useCallback(() => {
if (!localPlayerId) {
console.warn('[CardSorting] No local player - spectating only')
return // ✅ Spectators blocked from starting game
}
// ... send move
}, [localPlayerId, sendMove])
}
```
**Why This Pattern is Used**:
This enables spectator mode as a first-class user experience. Room members can:
- Watch other players solve puzzles
- Learn strategies by observation
- Cheer and coach
- Take turns (finish watching, then play yourself)
**Status**: ✅ CORRECT IMPLEMENTATION
**Priority**: N/A - No changes needed
---
## Scope of Spectator Mode
This same room-based sync pattern exists in **ALL** arcade games currently:
```bash
$ grep -A 2 "useRoomData" /path/to/arcade-games/*/Provider.tsx
card-sorting/Provider.tsx: const { roomData } = useRoomData()
complement-race/Provider.tsx: const { roomData } = useRoomData()
matching/Provider.tsx: const { roomData } = useRoomData()
memory-quiz/Provider.tsx: const { roomData } = useRoomData()
```
All providers pass `roomId: roomData?.id` to `useArcadeSession`. This means:
- ✅ **All games** support spectator mode automatically
- ✅ **Single-player games** (card-sorting) enable "watch me play" experience
- ✅ **Multiplayer games** (matching, memory-quiz, complement-race) support both players and spectators
**Status**: This is the recommended pattern for social/family gaming experiences.
---
## ✅ Correct Implementations
### 1. Active Players Handling (CORRECT)
**Location**: `/src/arcade-games/card-sorting/Provider.tsx` lines 287, 294-299
The provider correctly uses `useGameMode()` to access active players:
```typescript
const { activePlayers, players } = useGameMode()
const localPlayerId = useMemo(() => {
return Array.from(activePlayers).find((id) => {
const player = players.get(id)
return player?.isLocal !== false
})
}, [activePlayers, players])
```
✅ Only includes players with `isActive = true`
✅ Finds the first local player for this single-player game
✅ Follows architecture pattern correctly
---
### 2. Player ID vs User ID (CORRECT)
**Location**: Provider.tsx lines 383-491 (all move creators)
All moves correctly use:
- `playerId: localPlayerId` (PLAYER makes the move)
- `userId: viewerId || ''` (USER owns the session)
```typescript
// Example from startGame (lines 383-391)
sendMove({
type: 'START_GAME',
playerId: localPlayerId, // ✅ PLAYER ID
userId: viewerId || '', // ✅ USER ID
data: { playerMetadata, selectedCards },
})
```
✅ Follows USER/PLAYER distinction correctly
✅ Server can validate PLAYER ownership
✅ Matches architecture requirements
---
### 3. Validator Implementation (CORRECT)
**Location**: `/src/arcade-games/card-sorting/Validator.ts`
The validator correctly implements all required methods:
```typescript
export class CardSortingValidator implements GameValidator<CardSortingState, CardSortingMove> {
validateMove(state, move, context): ValidationResult { ... }
isGameComplete(state): boolean { ... }
getInitialState(config: CardSortingConfig): CardSortingState { ... }
}
```
✅ All move types have validation
`getInitialState()` accepts full config
✅ Proper error messages
✅ Server-side score calculation
✅ State transitions validated
---
### 4. Game Registration (CORRECT)
**Location**: `/src/arcade-games/card-sorting/index.ts`
Uses the modular game system correctly:
```typescript
export const cardSortingGame = defineGame<CardSortingConfig, CardSortingState, CardSortingMove>({
manifest,
Provider: CardSortingProvider,
GameComponent,
validator: cardSortingValidator,
defaultConfig,
validateConfig: validateCardSortingConfig,
})
```
✅ Proper TypeScript generics
✅ Manifest includes all required fields
✅ Config validation function provided
✅ Uses `getGameTheme()` for consistent styling
---
### 5. Type Definitions (CORRECT)
**Location**: `/src/arcade-games/card-sorting/types.ts`
State and move types properly extend base types:
```typescript
export interface CardSortingState extends GameState { ... }
export interface CardSortingConfig extends GameConfig { ... }
export type CardSortingMove =
| { type: 'START_GAME', playerId: string, userId: string, ... }
| { type: 'PLACE_CARD', playerId: string, userId: string, ... }
...
```
✅ All moves include `playerId` and `userId`
✅ Extends SDK base types
✅ Proper TypeScript structure
---
## Recommendations
### 1. Add Spectator UI Indicators (Enhancement)
The current implementation correctly enables spectator mode, but could be enhanced with better UI/UX:
**Action**: Add spectator indicators to `GameComponent.tsx`:
```typescript
export function GameComponent() {
const { state, localPlayerId } = useCardSorting()
return (
<>
{!localPlayerId && state.gamePhase === 'playing' && (
<div className={spectatorBannerStyles}>
👀 Spectating {state.playerMetadata?.name || 'player'}'s game
</div>
)}
{/* Disable controls when spectating */}
<button
onClick={placeCard}
disabled={!localPlayerId}
className={css({
opacity: !localPlayerId ? 0.5 : 1,
cursor: !localPlayerId ? 'not-allowed' : 'pointer',
})}
>
Place Card
</button>
</>
)
}
```
**Also Consider**:
- Show "Join Game" prompt during setup phase for spectators
- Display spectator count ("2 people watching")
- Add smooth real-time animations for spectators
---
### 2. Document Other Games
All arcade games currently support spectator mode. Consider documenting this in each game's README:
**Games with Spectator Mode**:
- ✅ `card-sorting` - Single-player puzzle with spectators
- ✅ `matching` - Multiplayer battle with spectators
- ✅ `memory-quiz` - Cooperative with spectators
- ✅ `complement-race` - Competitive with spectators
**Documentation to Add**:
- How spectator mode works in each game
- Example scenarios (family game night, classroom)
- Best practices for spectator experience
---
### 3. Add Spectator Mode Tests
Following ARCADE_ARCHITECTURE.md Spectator Mode section, add tests:
```typescript
describe('Card Sorting - Spectator Mode', () => {
it('should sync state to spectators when USER plays in a room', async () => {
// Setup: USER A and USER B in same room
// Action: USER A plays Card Sorting
// Assert: USER B (spectator) sees card placements in real-time
// Assert: USER B cannot place cards (no localPlayerId)
})
it('should prevent spectators from making moves', () => {
// Setup: USER A playing, USER B spectating
// Action: USER B attempts to place card
// Assert: Action blocked (localPlayerId check)
// Assert: Server rejects if somehow sent
})
it('should allow spectator to play after current player finishes', () => {
// Setup: USER A playing, USER B spectating
// Action: USER A finishes, USER B starts new game
// Assert: USER B becomes player
// Assert: USER A becomes spectator
})
})
```
---
### 4. Architecture Documentation
**✅ COMPLETED**: ARCADE_ARCHITECTURE.md has been updated with comprehensive spectator mode documentation:
- Added "SPECTATOR" to core terminology
- Documented three synchronization modes (Local, Room-Based with Spectator, Pure Multiplayer)
- Complete "Spectator Mode" section with:
- Implementation patterns
- UI/UX considerations
- Example scenarios (Family Game Night, Classroom)
- Server-side validation
- Testing requirements
- Migration path
**No further documentation needed** - Card Sorting follows the recommended pattern
---
## Compliance Checklist
Based on ARCADE_ARCHITECTURE.md Spectator Mode Pattern:
- [x] ✅ **Provider uses room-based sync to enable spectator mode**
- Calls `useRoomData()` and passes `roomId: roomData?.id`
- [x] ✅ Provider uses `useGameMode()` to get active players
- [x] ✅ Provider finds `localPlayerId` to distinguish player vs spectator
- [x] ✅ Game components correctly use PLAYER IDs (not USER IDs) for moves
- [x] ✅ Move actions check `localPlayerId` before sending
- Spectators without `localPlayerId` cannot make moves
- [x] ✅ Game supports multiple active PLAYERS from same USER
- Implementation allows it (finds first local player)
- [x] ✅ Inactive PLAYERS are never included in game sessions
- Uses `activePlayers` which filters to `isActive = true`
- [ ] ⚠️ **UI shows spectator indicator**
- Could be enhanced (see Recommendations #1)
- [ ] ⚠️ **UI disables controls for spectators**
- Could be enhanced (see Recommendations #1)
- [ ] ⚠️ Tests verify spectator mode
- No tests found (see Recommendations #3)
- [ ] ⚠️ Tests verify PLAYER ownership validation
- No tests found
- [x] ✅ Validator implements all required methods
- [x] ✅ Game registered with modular system
**Overall Compliance**: 9/13 ✅ (Core features complete, enhancements recommended)
---
## Summary
The Card Sorting Challenge game is **correctly implemented** with:
- ✅ Active players (only `isActive = true` players participate)
- ✅ Player ID vs User ID distinction
- ✅ Validator pattern
- ✅ Game registration
- ✅ Type safety
- ✅ **Spectator mode enabled** (room-based sync pattern)
**Architecture Pattern**: Room-Based with Spectator Mode (RECOMMENDED)
**CORRECT**: Room sync enables spectator mode as a first-class feature
The `roomId: roomData?.id` pattern is **intentional and correct**:
1. ✅ Enables spectator mode automatically
2. ✅ Room members can watch games in real-time
3. ✅ Creates social/collaborative experience
4. ✅ Spectators blocked from making moves (via `localPlayerId` check)
5. ✅ Follows ARCADE_ARCHITECTURE.md recommended pattern
**Recommended Enhancements** (not critical):
1. Add spectator UI indicators ("👀 Spectating...")
2. Disable controls visually for spectators
3. Add spectator mode tests
**Priority**: LOW (enhancements only - core implementation is correct)
---
## Next Steps (Optional Enhancements)
1. ✅ **Architecture documentation** - COMPLETED (ARCADE_ARCHITECTURE.md updated with spectator mode)
2. Add spectator UI indicators to GameComponent (banner, disabled controls)
3. Add spectator mode tests
4. Document spectator mode in other arcade games
5. Consider adding spectator count display ("2 watching")
**Note**: Card Sorting is production-ready as-is. Enhancements are for improved UX only.