[elihu]

The video mentions that moves that can only be done by pressing right and left at the same time aren't allowed, as that can't be done on a controller. I wonder if keyboard input is tolerated but only if it blocks impossible combinations, or if it's just on the honor system not to do those moves?

[stormbrew]

It'd be impossible to do that on the honour system. It would take an absurd amount of coordination to avoid ever doing it in a game like SMB, and the effects would be pretty immediately obvious.

If you're using an emulator, you have to enable allowing it. If you're using a hardware adapter you'd have to have your adapter blocking it.