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.
Done withCodex
- 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.
Try it yourself with Codex
Build a browser-based [racing] game in [folder] with [number] racers, [number] maps, and [power-ups or items]. Then play-test it yourself, fix any bugs or balance problems you find, and write a short QA report. You are done when the game runs with one command and you have listed how to start it and what you fixed.
3 more accounts of this
Source: openai.com · Undated
Five of these in your inbox every morning
The best things people got an AI agent to do, each with the prompt to try it.
More like this
Turn tickets into merged pull requests
Pulls tasks from GitHub Issues or Linear, then runs Claude Code or Codex in isolated Kubernetes pods to carry each one through to a PR.
Recommend a hotel from client notes using Codex
A travel advisor had Codex use client notes to recommend a Belmond hotel in Italy, checking live booking engines and generating a detailed Word doc.
Diagnose a killed process on a server
Codex CLI over SSH found the OOM killer in kernel logs on a 2 GB droplet with no swap and listed fixes by risk without changing anything.
Play RollerCoaster Tycoon
Ramp Labs put Claude Code in RollerCoaster Tycoon.
Build Godot games with paired design and coding agents
Cowork handles design docs, task queues and playtests while Claude Code writes GDScript and runs Godot and git.
Build a match-3 game from a single prompt
An author prompted Gemini 3 Pro once to produce a working Candy Crush-style game with a shareable link, and says a non-technical friend did too.