Claude and I built Morituri, a free gladiator brawler you can play online with your friends, in a month (Opus 5.5 + three.js)

This is **MORITURI**, a gladiator platform fighter that runs in the browser, built with Claude Code (Opus 5.5) over the last month. Every shot is the real game engine running bot matches, and Claude shot and cut the video itself. **How Claude made the trailer** I expected a screen recording. Instead, Claude: 1. Added a hidden trailer mode that plays a seeded bot match on a virtual clock, so the same fight replays exactly, frame for frame, every time. 2. Simulated 80 bouts without rendering them to find the good moments: knockouts, hazard kills and ultimates. 3. Filmed those moments frame by frame in a headless browser at 1080p, with scripted cinematic cameras. The hero angles are found by ray-casting, so scenery never hides the champion. 4. Rebuilt the sound from each clip's event log through the game's own audio engine, so every hit and crowd roar lands in sync. The music is the game's arena theme, rearranged at 132 bpm with the game's own synth instruments, and the cuts land…