Full walkthrough: building a GBA game with GPT-6 Astra, prompts included
HugoDuprez · x · 2026-09-08
This is developer Hugo Duprez's full blog walkthrough of building a Game Boy Advance game with GPT-6 Astra:
- Initial prompt: defines a turn-based bow duel — D-pad for angle/power, A to shoot, arrows following gravity- and wind-affected arcs, health with headshot bonuses, best-of-three matches, believable AI aiming mistakes with difficulty settings, plus control and UI requirements
- Art assets: generated via Sprite Fusion's API with instructions for consistent characters, scenery, arrow, and splash-screen logo, including poses and animations
- Result: a ROM running on real GBA hardware (AGS-001)
Full prompts, assets, and the ROM are published, making this a complete reference for LLM-driven retro game development.
Related event: Developer Builds a Playable GBA Game with GPT-6 Astra(2 posts)→
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