Dad and 6-Year-Old Daughter Build Full Unicorn Game with Claude: 136k Lines of Code
OnyxMonolith · reddit · 2026-10-29
A quantitative engineer shares how he and his 6-year-old daughter used Claude Sonnet 5.5 as the coding agent to build a complete pixel-art unicorn sandbox game in under a month. Claude wrote 136k lines of TypeScript including a code-only software 3D renderer, synthesized all 75 sound effects and 9 music loops, a map compiler proving reachability, and 3,000+ tests. Their loop: daughter plays and gives notes (up to 25 per round), dad feeds them to Claude. Key practices: written tech spec first, throwaway engine spikes, style checks before mass rendering, a 245-row decision log, runtime measurement of real bugs, screenshot/signal-analysis checks for what Claude can't see or hear, and no subagents for auditability.
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