# WIA-EDU-014 Game-Based Learning Standard v1.2

## Phase 3: Protocol & Multiplayer Systems

**Status:** ✅ Complete
**Version:** 1.2.0
**Date:** 2025-12-25
**Philosophy:** 弘익人間 (Benefit All Humanity)

---

## 1. Overview

Phase 3 introduces WebSocket-based protocols for real-time multiplayer experiences, live collaboration, and synchronous interaction in educational games.

## 2. Scope

Phase 3 covers:
- WebSocket connection management
- Real-time game session protocols
- State synchronization
- Player actions and events
- Chat and communication
- Live leaderboards
- Latency management
- Security and anti-cheating

## 3. WebSocket Connection

### 3.1 Connection Establishment
```
wss://game.platform.com/v1/multiplayer
```

### 3.2 Authentication
```json
{
  "type": "auth",
  "token": "Bearer eyJhbG...",
  "playerId": "player_xyz789"
}
```

Response:
```json
{
  "type": "auth_success",
  "sessionId": "session_12345",
  "timestamp": "2025-12-25T15:00:00Z"
}
```

## 4. Session Management

### 4.1 Create Session
```json
{
  "type": "session.create",
  "gameId": "game_abc123",
  "mode": "cooperative|competitive|team",
  "maxPlayers": 4,
  "settings": {
    "difficulty": "medium",
    "timeLimit": 1800,
    "chatEnabled": true
  }
}
```

### 4.2 Join Session
```json
{
  "type": "session.join",
  "sessionId": "session_12345"
}
```

### 4.3 Leave Session
```json
{
  "type": "session.leave",
  "sessionId": "session_12345",
  "reason": "voluntary|disconnect|timeout"
}
```

## 5. State Synchronization

### 5.1 State Update
```json
{
  "type": "state.update",
  "sessionId": "session_12345",
  "timestamp": "2025-12-25T15:05:23.456Z",
  "sequence": 1847,
  "state": {
    "currentChallenge": "ch_15_03",
    "teamScore": 450,
    "timeRemaining": 1200,
    "playerStates": {
      "player_xyz789": {"position": "zone_a", "score": 150}
    }
  }
}
```

## 6. Player Actions

### 6.1 Action Message
```json
{
  "type": "player.action",
  "actionType": "answer_submit|move|use_tool",
  "playerId": "player_xyz789",
  "timestamp": "2025-12-25T15:06:10.123Z",
  "data": {...}
}
```

## 7. Chat Protocol

### 7.1 Chat Message
```json
{
  "type": "chat.message",
  "from": "player_xyz789",
  "to": "all|player_id",
  "message": "Message text",
  "timestamp": "2025-12-25T15:07:00Z",
  "filtered": false
}
```

### 7.2 Safety Features
- Server-side profanity filtering
- Rate limiting (max 10 messages/minute)
- Report system
- Mute controls

## 8. Leaderboard Updates

```json
{
  "type": "leaderboard.update",
  "sessionId": "session_12345",
  "rankings": [
    {"rank": 1, "playerId": "player_def456", "score": 480},
    {"rank": 2, "playerId": "player_xyz789", "score": 450}
  ],
  "timestamp": "2025-12-25T15:08:00Z"
}
```

## 9. Disconnection Handling

### 9.1 Disconnect Detection
```json
{
  "type": "connection.lost",
  "timestamp": "2025-12-25T15:12:00Z"
}
```

### 9.2 Reconnection
```json
{
  "type": "reconnect",
  "sessionId": "session_12345",
  "playerId": "player_xyz789",
  "lastSequence": 1847
}
```

Response includes missed state updates.

## 10. Security

- TLS 1.3 required (wss://)
- Token-based authentication
- Server-side validation of all actions
- Rate limiting per connection
- Anti-cheat detection

---

**Next Phase:** Phase 4 defines WIA ecosystem integration.

弘益人間 · Benefit All Humanity
© 2025 WIA - MIT License