I pasted the prompt skeleton from this article into Claude Opus 5.5 and picked one rule off its list: a ship that sinks if you load one side

It built Listing. Containers come one at a time off a crane, the hull rolls toward the heavy side, past 12° the low stack slides into the sea, lose 4 and she capsizes

816 lines of three.js, one file, no assets
39 minutes and $6.22 for the run that worked
the first try hit my 50-minute timeout. I asked for ONE file in one go and it finished

The cursor in the video is the game's own scripted playtest. It overloads starboard, loses 2 boxes at 13.7°, then saves the ship

Every step from an empty folder to a game on a phone is in the article

https://polymarket.com/event/anthropic-ipo-closing-market-cap-higher-strikes?via=macintosh