Self-Writing Game Engine prompt → complete game → a bot plays it to prove it's winnable & fun

● offline-ready

Describe a game in one sentence

seed verify with headless bot use WebLLM for flavor

No game yet

Type a prompt and press Generate. The engine will build a game and a bot will test it before you play.

Generation log — watch it build & self-correct

›Idle. Awaiting a prompt.

Design document

The generated game's design rationale, chosen mechanics and difficulty curve will appear here.

Difficulty curve

Verifier telemetry

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Your generated games

Games you generate are saved locally (IndexedDB) with a screenshot thumbnail. Nothing leaves your browser.

Everything — parsing, mechanics, level, art, music and the bot that verifies playability — runs locally in your browser. No server, no tracking, works offline.
Part of localFirstTools. Export any game as a standalone HTML you can share.