> TASBot is best described as a special R.O.B. robot outfitted with Legos to hold a custom circuit board that can exactly mimic the behavior of a video game controller. TASBot can play games on real video game consoles with superhuman abilities, usually leading to game breaking glitches in front of live audiences.
They use a modified ROM to set the memory state, but that could be done with SMB3 manually, apparently.