Build a 3D racing game with no art files using an agent
Jhin Lee had Gemini 4 Argon build a kart racing game in 15 short prompts; he reports about 3.5 hours of build time and zero image or model files.
Done with GeminiGemini 4 Argon
What they did
Jhin Lee asked Gemini 4 Argon, inside Google's Antigravity tool, for a Mario Kart-style game with no outside art or sound files. He gave casual feedback like a playtester. The agent built characters from simple shapes and screenshotted the game to fix them. It also generated music from instruments built into macOS and published a browser version.
How it went
He says it took 15 prompts and about 3.5 hours. The agent spotted a character looked wrong from behind and fixed it. It also traced a broken web deploy to a hidden file blocking graphics.
Worth knowing
It needed pushback: first audio sounded cheap, characters were designed only from the front, and the game started about 22% too fast for humans.
Try it yourself with Gemini
Build a [type of game] in [framework] using no outside image, model or sound files; generate everything in code. After each change, run the game, take a screenshot, and check it looks right from the player's view. I'll give short playtest feedback and you fix it. When it works, show me how you plan to publish a browser version to [hosting service] and wait for my approval before deploying.
Swap the highlighted [parts] for your own details.
Source: DEV Community · Jhin Lee · Oct 19, 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. Spotted a mistake? Tell us.
