Claude builds a full bullet hell (danmaku) game from data-driven prompt specs
caxco93 · reddit · 2026-10-02
Reddit user caxco93 tested whether Claude could build a Danmaku (bullet hell) game, given how mathematical motion design already works well with it, and published the full prompt history.
Key steps:
- Started by having Claude build a basic entity engine with vanilla TypeScript + Vite, then define a data-based standard for danmaku attack patterns (loops, angles, velocity as pure data)
- First round hit a bug: bullet counts grew into the thousands while only 7 petals showed; fixed after feedback
- Iterated into a 60s boss battle animation with dramatic zoom, electricity effects, anime motion-line backgrounds, a WARNING for the final stage, non-textual storytelling, and per-stage uniqueness
- Synthesized sounds via the Web Audio API, deliberately avoiding one sound per bullet to prevent noise
Verdict: Claude handles math-heavy, rule-driven bullet patterns well, making this genre a good fit for AI coding.
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