So it turns out that someone was combining Super Mario 64 and Minecraft code before Claude made it possible.
@beardalaxy @GD5426 Injecting a character from a different with all his/her movements should be trivial. You probably don't even need the source code, you could just use information analyzed from speedrunners or something like that.
However, this guy was able to inject Minecraft's mechanics, physics, UI, all the blocks, mobs, etc into Mario 64 manually and it's very impressive.