Build a racing game from a single prompt
Codex made a racing game with multiple racers, eight maps and items from one prompt, acting as designer, developer and QA tester by playing it.
What they did
Codex got one detailed prompt for a Three.js voxel kart racer, plus an image generation skill and a web game development skill. It then worked alone, acting as designer, developer and QA tester by playing the game. It was repeatedly re-prompted from a random list of ten generic prompts, such as finding what's missing, adding features, testing them and fixing bugs.
How it went
The build produced a racing game with different racers, eight maps and space-bar items, using over 7 million tokens. Earlier iterations are published so you can see how it improved. The source gives no quality assessment.
Worth knowing
The whole run used more than 7 million tokens from a single initial prompt, so expect heavy usage. The prompt is summarized, not verbatim.
Labels
It then worked alone, acting as designer, developer and QA tester by playing the game.
Codex made a racing game with multiple racers, eight maps and items from one prompt, acting as designer, developer and QA tester by playing it.
The build produced a racing game with different racers, eight maps and space-bar items, using over 7 million tokens.
Codex got one detailed prompt for a Three.js voxel kart racer, plus an image generation skill and a web game development skill.
The “Material” label failed its quality check and is not used for selection.
Details
- Agents
- Codex
- Source
- vendor site
- Source date
- undated
- Accounts
- 4
- In registry since
- Oct 12, 2026