Claude Code wrote all 15k lines of a 5-chapter co-op game in 3 weeks — what kept it cohesive
Zealousideal-Bar-316 · reddit · 2026-10-19
A developer shares how Claude Code (Opus 5.5) wrote all 15k lines of GDScript for Pixel & Pincel, a 2-player co-op platformer in Godot 4.7, over three weeks.
What made it cohesive:
- Persistent rules: a design doc plus a memory file Claude reads every session — rules living only in chat drifted.
- Self-auditing: before the final chapter, Claude counted every reused mechanic (one appeared 9 times) and built the last chapter only from new ones.
- Approving concepts before building kept rework rare.
- Bots playtest every chapter online/offline after each change, plus a human reviewing footage — the human caught the heroine running backwards, which every automated test missed.
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