I had Claude make my game's trailer by re-rendering real player replays inside the engine, no video editor

Play the free demo on Steam: [https://store.steampowered.com/app/4923650/](https://store.steampowered.com/app/4923650/) Play in your browser: [https://ninja.mightybig.ca/](https://ninja.mightybig.ca/) This little trailer for my game Rope Ninja (2D ninja-rope racing) was made with Claude Opus 5.5 in Claude Code. I never opened a video editor. Earlier attempts used screen recordings and looked bad. In a raw capture the runner is about 50px tall, so you're mostly watching scenery. So instead of cutting footage, it rendered new footage from inside the game: • Real runs, re-simulated: it pulled players' recorded runs from my Firebase leaderboard. Runs store their inputs and the sim is deterministic, so it replays them through the actual game. Most finish on the exact same tick as the recorded time. • A trailer camera in the engine: it added a dev-only capture mode. Playwright drives a headless browser, steps the game one 60fps frame at a time, hides the HUD, and uses a camera that…