Claude builds full 3D browser game from 2024 tweet in one session

Willison's original 2024 tweet contained a GPT-3-generated game concept and DALL-E concept art for a raccoon heist game. Two years later, he decided to test whether a modern AI coding assistant could build the entire game from those artifacts alone, with minimal instruction. The key innovation here is not just that Claude succeeded, but the infrastructure Willison used to make the task tractable: GitHub Pages as a live-preview system during development, coupled with Claude Code's ability to commit and push changes in real time. This removed the friction of "show me what you've built so far"—Willison could watch the game materialize incrementally in the browser without leaving his phone, where he wrote the entire prompt in Notes. Claude's decision to use Playwright for self-testing is particularly striking; the AI didn't just build features, it verified them with automated playthroughs, caught canvas rendering bugs that desktop-only testing had masked, and wrote regression tests. The game itself is complete: three escalating difficulty levels, procedurally generated low-poly characters, collision detection, guards with line-of-sight logic, a scent-tracking hound that ignores line-of-sight, mobile UI, and a persistent high-score system. All textures and the title art were generated via the OpenAI API and baked into the repo, so the live game makes no external API calls.