My “Rally Adventure” one-shot game, made with Opus 5 medium thinking

TL;DR: I gave Claude Opus a single prompt asking for an off-road driving game with a retro Screamer Rally look, and let it fan out sub-agents. A few hours later I had Rally Adventure: Three.js, TypeScript and Rapier, every texture and every sound generated in code. After seeing the tweet by Jake Verbaten on his fire truck game I’ve decided to give it a try. This is the prompt, strongly inspired by…