Try It Now
Flappy Bird (NES Homebrew) — fully playable in your browser
LOADING EMULATOR...
Initializing WASM cores
↑↓←→ MoveX / Z ButtonsEnter Start
Batteries Included
🎮
Universal Emulation
NES to PlayStation. Game Boy to Arcade. Automatic core selection based on file extension.
☁️
Cloud-Ready Saves
Slot-based saves with screenshots. Auto-save. Emergency saves on tab close. You provide the backend.
📱
Touch Controls
GPU-accelerated virtual D-pad. Multi-touch combos. Per-system button layouts.
🏆
RetroAchievements
Official RA integration. Unlock achievements. Hardcore mode with restrictions.
⏪
Rewind Time
Made a mistake? Rewind. Auto-enabled for lightweight 8/16-bit systems.
📹
Gameplay Recording
Capture gameplay as WebM video. VP9 codec at 30fps. Just press F5.
Simple by Design
Minimal Setup
App.tsx
import { GamePlayer } from 'koin.js';
export default function App() {
return (
<GamePlayer
romId="game-123"
romUrl="/roms/mario.nes"
system="NES"
title="Super Mario Bros."
/>
);
}Cloud Integration
App.tsx
<GamePlayer
romId="game-123"
romUrl="/roms/game.nes"
system="NES"
title="My Game"
// Your backend handlers
onSaveState={handleSave}
onLoadState={handleLoad}
onAutoSave={handleAutoSave}
// Optional theming
systemColor="#FF3333"
shader="crt/crt-lottes"
/>