Build a small 3D island adventure game with an agent
A creator had Codex, with a 3D model maker called Tripo plugged in, build a playable island adventure game; they say it took under an hour.
Done with OpenAI CodexGPT-6 Astra
What they did
The creator asked GPT-6 Astra, working inside Codex, for a small, cozy island adventure. It needed a lighthouse, cottages and lanterns. Tripo, a tool that makes 3D models, was connected to Codex. Astra first built a rough playable version with stand-in shapes. Tripo then made the 3D models and gave the main character a skeleton and animations. Astra fitted it all together and polished the lighting, movement, camera and a lighthouse ending.
How it went
The author says the game, LUMEN ISLES, is playable and was made in under an hour. They show it in a video.
Worth knowing
Building a rough playable version with stand-in shapes first, then swapping in the finished models, kept the work simple.
Try it yourself with OpenAI Codex
Using the Tripo CLI connected to this environment, build a small playable 3D game: [describe the world, e.g. a cozy island with a lighthouse and cottages]. First make a working prototype with simple placeholder models and show it to me. Once I approve, use Tripo to generate the 3D assets, rig and animate the main character, and replace the placeholders. Then integrate everything and polish lighting, movement and camera. End with [finale idea]. Summarize what you built and how to run it.
Swap the highlighted [parts] for your own details.
Source: X · @TokenGremlin · Oct 15, 2026
Written with AI assistance from the original post and checked against our editorial guidelines. Results are as reported by the source, not independently verified.
