Claude Code builds a browser mech game in 2 days, with AI autopilot playtesting
vinishkapoor · reddit · 2026-11-15
A developer shipped AI Parabellum, a third-person browser mech game written entirely by Claude Code (Opus 5.5) in about two days with zero manual code edits. Six missions culminate in "the Core," with a hijacking hook: overheat an enemy mech, hold E, and climb into it.
Lessons from the build:
- Look before gameplay: after a low-poly top-down first draft flopped, Claude built one rainy-night street with a walking mech and only proceeded once it looked right.
- Hardest bug: camera turning revealed the city was a film set (building fronts with nothing behind); Claude walled the area and stopped camera clipping.
- Invisible walls became a visible red AI defense grid with a warning.
- AI playtesting: Claude wrote an autopilot that plays every mission in a headless browser, finds stuck points, fixes game and bot, and recorded the trailer frame by frame with real game audio.
Stack: three.js, 20 CC BY Sketchfab models, Poly Haven skies/textures; all sound and music generated in code. Free to play in desktop browsers, no sign-up.
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