Theme: BLACK CAT
Size: 12.8KB (99% of 13KB limit)
Category: Online (Multiplayer)
A multiplayer cat battle royale with simplified Pathfinder 2nd Edition mechanics. Players control cats in a low-poly synthwave-esque city environment, surviving against other players, environmental hazards, and a roaming boss cat.
- Multiplayer Battle Royale: Real-time multiplayer using WebSocket/PartySocket
- Pathfinder 2e Mechanics: Simplified stats, combat, and diplomacy system
- Boss Cat AI: Roaming "Shadow Cat" boss with enhanced stats
- Low-Poly 3D Rendering: Custom canvas-based 3D renderer
- Cat Classes: Fighter, Rogue, Wizard, and Cleric cats with unique abilities
- WASD: Camera controls
- Arrow Keys: Cat Movement Controls
- X: Attack
- Z: Stealth (if Rogue)
- C: Cast (if Wizard or Cleric)
- H: Heal (if Cleric)
- T: View Stat Block
- Space: End Turn
- 1: Target Choice
- 2: Target Choice
- 3: Target Choice
- Spawn: Random cat character with Pathfinder 2nd Edition stats
- Explore: Navigate city blocks and alleyways
- Encounter: Meet other player cats and choose combat or diplomacy
- Survive: Avoid the shrinking storm area and roaming boss
- Win: Last cat standing wins the battle royale
The game uses extreme compression techniques to fit within 13KB:
- Micro-Pathfinder: Essential PF2e mechanics
- Micro-Renderer: 3D projection and rendering
- Micro-Game: Core game loop and networking
- Function Minification: Aggressive code compression
- PartySocket Integration: Uses competition-provided PartySocket when available
- WebSocket Fallback: Native WebSocket for local development
- Offline Mode: Graceful degradation for single-player experience
- Real-time Sync: Player positions, combat, and boss movement
- Custom Projection: Perspective projection without external libraries
- Depth Sorting: Painter's algorithm for polygon rendering
- Procedural Geometry: All models generated algorithmically
- Low-Poly Style: Minimal polygons for optimal performance
npm install
npm run dev # Start development server
npm test # Run test suite
npm run build # Build full-featured version (exceeds 13KB)node build-ultra.js # Build ultra-compressed versionnode optimize.js # Analyze code size and optimization targets
npm run size # Check current build sizeroll-for-mischief/
├── src/ # Source code
│ ├── micro-pathfinder.js # Ultra-compressed P2e system
│ ├── micro-renderer.js # Minimal 3D renderer
│ ├── micro-game.js # Core game logic
│ └── index.html # HTML template
├── dist/ # Built game files
├── test/ # Test suite
├── build-micro.js # Ultra-compression build
└── cats-13k-micro.zip # Final 13KB submission
✅ Size Limit: 12.8KB (200ish bytes under the 13KB limit)
✅ Theme: "BLACK CAT" - players are cats, boss is "Shadow Cat"
✅ Offline-First: Works without internet connection
✅ Online Features: Multiplayer via PartySocket (optional)
✅ No External Libraries: Everything custom-built
✅ Browser Compatible: Works in modern browsers
The initial implementation included:
- Complete JRPG-style dialog system
- DOOM style billboard 3D cat sprites
- Inspired Pathfinder 2nd Edition spell system
- Comprehensive UI with bordered dialogs
- Extra player / Boss AI
Total Size: 20KB uncompressed, 12.8KB compressed
To meet the 13KB limit, the game was drastically simplified:
- JS minification techniques
- Streamlined features
- Sprite compression
- Roadroller
Final Size: 12.8KB compressed
The game supports real-time multiplayer through:
- Room-based sessions via PartySocket
- Party-game Room based Join mechanics
- Game State/Chat broadcasts
- Player turn timeouts
If size limits were relaxed, the game could be expanded with:
- Other Pathfinder 2nd Edition Mechanics (Diplomacy, Proper Stealth)
- Detailed 3D cat models and animations
- Complete Pathfinder 2e spell and feat system
- Interactive environment objects
- Sound effects and background music
- Advanced boss encounters with multiple phases
- Persistent leaderboards and statistics
Created for JS13kGames 2025 competition - Theme: "BLACK CAT"