Flixtris
Stack blocks. Send garbage. Crush your friends.
The classic puzzle game reimagined for the modern web. Play solo, compete in daily challenges, battle friends in real-time multiplayer, or organize tournaments — all in your browser, no downloads required. Pure JavaScript, modular architecture, instant fun.
Created by Carlos S. Nah
Version 1.1.0 - Latest Updates
- Mobile Optimized - Fixed game board display issues on mobile devices
- Modular Architecture - Refactored codebase into focused, maintainable modules
- Tournament Mode - Create and manage tournaments with single elimination or round-robin formats
- Auto-Update System - PWA users receive notifications when updates are available
- Enhanced Leaderboards - Global, daily, and weekly leaderboards with improved UI
Features
-
Five Game Modes
- Classic - Endless mode with increasing difficulty
- Daily Challenge - Same piece sequence for everyone, compare scores
- Hardcore - No pause, no ghost piece, no mercy
- Multiplayer - Real-time 1v1 battles with live opponent board view
- Battle Royale - 2-16 players, last one standing wins!
-
Tournament System 🆕
- Single Elimination and Round Robin formats
- Support for 4, 8, or 16 players
- Track match results and standings
- Persistent tournament data
-
Play Custom Seeds - Enter a shared seed code to challenge friends
-
NES-Style Scoring
- Single: 40 pts
- Double: 100 pts
- Triple: 300 pts
- Tetris: 1200 pts
- All multiplied by (Level + 1)
-
Retro Sound Effects - 8-bit style sounds generated with Web Audio API
-
Fully Mobile Responsive - Optimized touch controls and layout for all screen sizes
-
PWA Support - Install as an app, works offline, auto-updates when online
-
Leaderboards - Global, daily, and weekly leaderboards with persistent storage
Controls
Keyboard
| Key | Action |
|---|
| ← → | Move left/right |
| ↑ | Rotate |
| ↓ | Soft drop |
| Space | Hard drop |
| P | Pause (not in Hardcore) |
| H | Help |
Mobile
Touch control buttons appear below the game canvas on mobile devices.
Game Modes
Daily Seed Sharing
In Daily mode, everyone gets the same piece sequence based on the date.
Seed format: FLX-YYYY-MM-DD
Share your score with friends:
Flixtris Daily Challenge
FLX-2026-1-3
Score: 12430 | Level: 8 | Lines: 72
Can you beat my score?
Friends can enter the seed via "Play Seed" to get the exact same game.
Multiplayer Mode
Challenge friends to real-time 1v1 battles!
How it works:
- Select "Multiplayer" from the main menu
- Create a room or join with a 4-character room code
- Wait for your opponent to join
- Both players click "Ready!"
- Game starts with a countdown - both players get the same piece sequence
- See your opponent's board in real-time as you play
- Highest score wins!
Multiplayer Features:
-
🎯 Garbage Lines - Clear multiple lines to send garbage to your opponent!
- Double: 1 garbage line
- Triple: 2 garbage lines
- Tetris: 4 garbage lines
-
😀 Quick Emojis - Send reactions during the game (👍 🔥 😀 💀 and more)
-
🔄 Rematch - Quick rematch button to play again with the same opponent
-
🔌 Reconnection - Disconnect? No problem! Auto-reconnect keeps your game alive
-
💾 Server Persistence - Server saves state, survives restarts
Installation
Client (Static Files)
Serve with any static server:
npx serve .
# or
python -m http.server 8000
Open in browser and optionally install as a PWA.
Premium Roadmap Progress (Phase 1–3)
The premium roadmap is being implemented incrementally. Current status:
- Completed
- Phase 1 Foundations
- Cosmetics Store scaffolding (themes, piece skins, premium emojis)
- Entitlements stored locally in IndexedDB (
purchases store)
- Basic local balance support (for testing; can be extended to server-backed profiles)
- Premium emoji gating in multiplayer (owned emojis become usable)
- Phase 2 Foundations
- Replay recording (input timeline, seed, mode, scores)
- Replay viewer (overlay with timeline, play/pause/stop, seek, progress indicator)
- Advanced analytics:
- APM/LPM, holes, average column height, comboMax
- Misdrop detection, drought tracking, T-spin counting
- In progress
- Phase 3 Ranked Mode (scaffolding added)
- Ranked queue join/leave from client
- Server-authoritative RNG seed broadcast at match start
- Basic ELO update endpoint and storage (Redis-backed)
- Client snapshot sending for anti-cheat validation (soft enforcement)
- Deterministic replay seek refinements and richer playback UI (step controls, speed selector)
- Cloud sync for entitlements/replays/analytics (planned)
Using the Cosmetics Store (Phase 1)
The store is designed to be local-first and data-attribute driven:
- Themes:
- Buttons with
data-store-theme="light|neon|retro" will purchase/apply themes.
- Piece Skins:
- Buttons with
data-store-skin="outline|pixel" will purchase skins.
- Premium Emojis:
- Buttons with
data-store-emoji="fire|grin|skull" purchase emojis.
- Emoji panel buttons should include
data-emoji="🔥" and optionally data-emoji-id="fire" so entitlement checks map correctly.
Testing tips:
- Grant test balance in DevTools to try purchases:
window.Flixtris.api.db.saveSetting("balance", 500)
- Owned items display as “Owned” and buttons disable accordingly.
Replays & Analytics (Phase 2)
What’s recorded:
- Replay inputs (keys + timestamps), mode, seed, duration, score/lines/level, and line clear metadata.
- Analytics metrics:
- APM/LPM
- Board holes and average height (computed at game end)
- ComboMax (max combo streak)
- Misdrops (locks that increase holes)
- DroughtMax (max pieces between I tetromino)
- T-Spins (counted when T clears occur post-rotation)
Viewer usage:
- “Your Replays” list shows recorded replays with Play/Delete buttons.
- Replay Viewer overlay provides:
- Play/Pause/Stop controls
- Seek slider that deterministically fast-forwards inputs to a timestamp
- Progress label reflecting elapsed vs recorded duration
- Event timeline listing inputs with relative timestamps
Running Tests
Basic tests are provided to validate analytics and replay playback:
- Test runner:
npm run test (executes analytics and replay tests sequentially)
- Individual tests:
npm run test:analyticsnpm run test:replay
Notes:
- Tests run in Node with minimal DOM shims and requestAnimationFrame polyfills.
- Analytics test validates the presence and sanity of computed metrics.
- Replay test runs a short input stream and checks board state changes.
Next Steps
- Tighten deterministic replay seeking and add richer playback controls (step, speed, progress bar sync with exact input timing).
- Visual analytics dashboards (charts for height/holes over time, combo streak distribution).
- Cloud sync layer for profiles, purchases, settings, replays, and analytics.
- Phase 3 ranked mode with server-authoritative RNG and anti-cheat primitives.
Multiplayer Server
The multiplayer feature requires running the WebSocket server with Redis:
Prerequisites:
- Node.js 16+
- Redis server (local or cloud-hosted like Redis Cloud, Upstash, etc.)
# Start Redis (if running locally)
redis-server
# Navigate to server directory
cd server
# Install dependencies
npm install
# Start the server
npm start
Environment Variables:
| Variable | Default | Description |
|---|
PORT | 3001 | WebSocket server port |
REDIS_URL | redis://localhost:6379 | Redis connection URL |
# Example with custom configuration
PORT=8080 REDIS_URL=redis://user:pass@host:6379 npm start
Health Check:
curl http://localhost:3001/health
# Returns: {"status":"ok","redis":"connected","rooms":0,"uptime":123.45}
Server Features:
- 🗄️ Redis persistence - Rooms survive server restarts
- ⚡ Automatic TTL - Rooms expire after 30 minutes in Redis
- 🔌 Graceful degradation - Works in memory-only mode if Redis unavailable
- 🔄 Reconnection tokens - Valid for 30 minutes, stored in Redis
- 📡 Health endpoint - Monitor server and Redis status
- 🛡️ Graceful shutdown - Notifies players, closes connections cleanly
Production Deployment:
# Using Docker with Redis
docker run -d --name redis redis:alpine
docker run -d --name flixtris-server \
-e REDIS_URL=redis://redis:6379 \
-e PORT=3001 \
-p 3001:3001 \
--link redis \
node:18-alpine sh -c "cd /app && npm start"
- Deploy behind a reverse proxy (nginx, Caddy) with SSL for
wss://
- Use Redis Cloud, Upstash, or AWS ElastiCache for managed Redis
- Scale horizontally - multiple server instances can share the same Redis
Tournament Mode
Create and manage competitive tournaments:
- Create Tournament - Choose between Single Elimination or Round Robin
- Add Players - Support for 4, 8, or 16 players
- Track Matches - View bracket, match results, and player standings
- Play Matches - Each match uses the game engine with score tracking
- Determine Winner - Automatic advancement and winner declaration
Tournament Types:
- Single Elimination - Lose once and you're out
- Round Robin - Everyone plays everyone, highest score wins
Auto-Update System
Flixtris includes an intelligent update system for PWA users:
- Automatic Checks - Checks for updates every minute when online
- User-Friendly Notifications - Update banner at bottom of screen
- One-Click Updates - Click "Update Now" to refresh with latest version
- Offline Support - Skips checks when offline, resumes when back online
- Service Worker Integration - Seamless PWA cache updates
The update system ensures you always have the latest features and bug fixes without manual intervention.
Project Structure
flixtris/
├── index.html # Main HTML
├── manifest.json # PWA manifest
├── version.json # Version info for update system
├── sw.js # Service Worker for PWA and caching
├── css/
│ └── styles.css # All application styles
├── js/
│ ├── db.js # IndexedDB storage and data management
│ ├── sound.js # Web Audio sound effects
│ ├── screens.js # Screen navigation and state 🆕
│ ├── settings.js # Settings management 🆕
│ ├── leaderboard.js # Leaderboard display and management 🆕
│ ├── tournament.js # Tournament system 🆕
│ ├── updates.js # Auto-update system 🆕
│ ├── game.js # Core game logic and rendering
│ ├── bot.js # AI bot implementation
│ ├── multiplayer.js # WebSocket multiplayer client
│ └── ui.js # UI coordination and event handling
├── server/
│ ├── index.js # WebSocket multiplayer server (Redis-backed)
│ ├── package.json # Server dependencies (ws, redis)
│ └── .gitignore # Ignore node_modules and env files
└── icons/
├── icon.svg
├── icon-192.png
└── icon-512.png
Tech Stack
- Vanilla JavaScript (ES6+) with modular architecture
- HTML5 Canvas for game rendering
- Web Audio API for sound effects
- IndexedDB for persistent storage
- CSS Variables & Flexbox for responsive design
- Service Workers for PWA functionality
- WebSocket for real-time multiplayer
- Node.js (server)
- Redis (server persistence)
Philosophy: No frameworks. No build tools. Minimal dependencies. Maximum performance and maintainability through clean, modular code.
Multiplayer Protocol
The multiplayer system uses a simple JSON message protocol:
Room Management:
create_room / room_createdjoin_room / room_joinedready / player_readyleave_room / player_left
Game Updates:
game_update / opponent_updategame_over / player_game_over
Battle Features:
send_garbage / incoming_garbagesend_emoji / emoji_receivedrequest_rematch / rematch_starting
Connection:
reconnect / reconnectedserver_shutdown
Redis Data Structure
The server uses the following Redis keys:
| Key Pattern | Type | Description |
|---|
flixtris:room:{code} | String (JSON) | Room metadata (code, seed, started, createdAt) |
flixtris:room:{code}:players | String (JSON) | Player data array |
flixtris:reconnect:{token} | String (JSON) | Reconnection token data |
flixtris:rooms:active | Set | Set of active room codes |
All keys have a 30-minute TTL for automatic cleanup.
License
MIT
