I have not watched the entire video, so there might be some coarse language, if that's the case I'm sorry. But this was too amazing to not post. This guy is emulating Metroid Fusion and Metroid Zero Mission on his computer, and controlling both with one controller at the same time.
In order to do this you would have to be an expert at both games, which this guy clearly is, the idea of 100% even one of these games in this amount of time is nuts, but to do it while you're also controlling another game, holy crackers! A few things make this possible, Metroid doors don't open unless you shoot them, this gives you the chance to move left in one game while the other game is staying in place. Let's see someone do this with Castlvania.