Super Mario 64's physics running on a Game Boy Advance

The full story

sm64-gba runs Super Mario 64's movement and collision code on Game Boy Advance hardware, matching the original bit for bit on every frame. The project says Claude Opus 5.5 wrote the code, the test harness and the notes.

Two rounds of optimisation made it 4.9 times faster on average, and the playable demo reaches 30 fps on 99% of frames. So far it has only been tested in emulators, and the default build uses no data from the game.