Started with a single sentence — "zap a snake on a plane" — and had a playable 3D first-person shooter running in the browser nine minutes after approving the plan. 18 TypeScript source files, a procedural airplane cabin with carpeted aisles and overhead bins, 5 snake species with different health pools and behaviors, a TAS-9000 stun gun with precision bolts and wide-angle EMP, a 3-stage campaign from Economy to Cockpit, and a Web Speech API pilot announcer delivering comedic PA lines through a bandpass radio filter. The whole thing runs on Three.js r170, zero art assets, zero external dependencies beyond the renderer. Every texture is procedural. Every sound is Web Audio API oscillator synthesis — taser crackles, airline chimes, spatial rattlesnake tails. The 285-line index.html is a full 90s CRT in-flight entertainment UI with scanline filters and a briefing screen. Pure prompt-to-game, no starter template, no boilerplate.