Building a 60FPS Flutter kart game with zero assets in 15 Gemini 4 Argon prompts
rseroter · x · 2026-10-22
Developer Jhin Lee stress-tested Gemini 4 Argon (inside Antigravity) with an unusual challenge: build a 60FPS Mario Kart-style 3D racing game in Flutter with zero external assets—no .glb models, no .png textures, no .mp3 audio. Everything is generated in code.
Key numbers:
- 15 prompts, 3h 26m active build time (4h 35m wall-clock with playtesting)
- 96.7% code shared between macOS desktop and WebAssembly
- 4 playable mascots, 3-tier drift boosts, jump ramps, coins, 7 items; live on GitHub Pages (MIT)
Notably, in prompts 5–9 the agent launched the macOS app and screenshotted its own window to fix camera angles, silhouettes and collisions; prompts 10–12 fixed "cheap" audio. The author gave short playtest-style feedback instead of long specs, and argues the case for Flutter as a game platform.
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