I put the entire game of Minecraft into Portal 2 as a mod; it supports multiplayer and lets you play the entire story with a Minecraft overlay!

Claude Opus 5.5 built Portal 2 inside Roblox 🌀 - real see-through portals (you can see yourself through them) - speedy thing goes in, speedy thing comes out - custom FPS controller, viewmodel + animations - cubes, buttons, doors, GLaDOS Every line of code written by Claude