I left Claude Code running for 24h — it built a 3D roguelite and shot its own trailer

**Setup**: three prompts, one every \~8 hours, each one a "gauntlet" prompt that hands the agent a goal and lets it run. No intervention inside a session. Prompt 1 built the base game, prompt 2 followed up after the first real playtest, prompt 3 closed the round. The whole timeline — 08/08 01:17 to 23:36. **What came out**: an isometric, controller-first roguelite where the base never stops walking. A spider-fortress marches a route on its own and can't halt; you run ahead of it mining veins, plant turrets, repair the hull, and decide what to abandon — while the noise of all that pulls the horde onto you. Three.js + TypeScript + Vite, DualShock 4 through the Gamepad API. 60k lines of TypeScript across 130 files, plus \~8.5k lines of design and architecture docs it wrote for itself to hand off between sessions. **On the assets, up front**: the 3D models come from the Kenney and KayKit packs (KayKit is paid). Claude picked what it needed from a local library and built the rest as…