Raincheck Raccoons
A simultaneous-choice rooftop snack heist for 2–10 friends on their phones. Pick a roof and a role, then find out who had the same idea.
- 18,000simulated matches to balance the rules
- 83API, lifecycle and browser checks
- 2–10players, no account
The game
The city is asleep. Every player secretly picks a rooftop and a role (Sneak, Scoop or Lookout). Stay under the roof’s noise limit and the crew splits the snacks; wake the neighbours and everyone on that roof leaves empty-pawed. After six raids, the biggest stash wins. Join with a 6-character room code or link; solo practice plays the real rules against three labelled bots.
Engineering
- A 2–10 player game in TypeScript, React 19 and Cloudflare Workers with server-side rules, deadlines, scoring and host handoff. The frontend runs as Next.js on Vercel and talks to the Cloudflare game backend through signed server-to-server requests.
- Simultaneous moves stay consistent with revision-checked Cloudflare D1 writes and bounded retries, plus round and match IDs on every choice. Tests with 9 concurrent joins and 10 concurrent choices resolved each round once with no duplicate scores.
- Account-free play secured with random session tokens stored as SHA-256 hashes in HttpOnly cookies, Zod payload validation, a 4 KB body cap, same-origin checks and rate limits. Authentication moved ahead of quota writes after review found forged cookies could create database rows.
- Fixed a race where a late polling response could restore a room the player had just left, using a request-generation guard, and confirmed the fix with a browser test that held a real response until after leaving.
- Original SVG art (city scenes, 8 avatars, role icons) and browser-synthesized sound with the Web Audio API; responsive layouts checked at 320, 390, 768 and 1440 px.
Process and verification
- Tuned the scoring rules with 18,000 simulated matches and a 5,280-case role comparison, which led to raising one role’s reward so it stayed a real strategic choice.
- Directed a multi-agent OpenAI Codex workflow from 100 game concepts to a 12-concept shortlist, then defined API contracts and file ownership for backend, art/audio and QA agents, with independent review.
- 27 engine tests (400 seeded scoring setups), 52 API and lifecycle checks, and 31 Playwright checks run against the public deployment.