Solo dev builds NFL play-calling daily game with Claude Code, hits 300K routes
muddycleats92 · reddit · 2026-10-29
A Reddit dev showcased ROUTES, a daily football play-calling game built almost entirely with Claude Code: draw receiver routes, read coverage, and throw against a sim trained on real NFL data, with a 30-week season where defenses keep improving and a global Daily mode.
Key engineering highlights:
- Single file, zero dependencies: one HTML file plus a tiny Node server.
- Headless test harness: Claude built a harness that loads the real game into a fake DOM and plays full seasons in Node, validating changes across thousands of simulated plays.
- No accounts or database: state lives in browser localStorage; the server just appends plays and Daily results to a plain log for analytics.
The game grew organically to 3,000 unique players and 300K+ routes, with 500+ playing yesterday's Daily.
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