[center]And some very holy crap.[/center]
I don't know the specifics of what's going on here, but it looks like a single controller is controlling four games at once. Pretty damn formidable. The concept alone is mindblowing. Seeing it done is ridiculous, regardless of any tools he used.
EDIT: While we're on the topic, This is pretty epic too. I don't know if it's more or less impressive, ... but .. just ... damn.
I want those hacks! They look fun.
http://www.youtube.com/watch?v=VlU6jfvAFzc&mode=related&search=
http://video.google.com/videoplay?docid=-2509794034861880408
its not hard to do frame by frame, mostly just tedius. the movies are tool assisted this generally means slowed down to play 1 frame at a time allowing input per frame, and rerecording if needed.
TASvideos has a video of the same controller input beating Mega Mans III through VI. I fucking love TASes.
tasvideos also contains links to youtube and google video for some of its videos, and that is what I linked to above^. Megaman 3, 4, 5 and 6 and a Megaman x1 & 2 video.
edit: ah, the first one (NES megaman) is not available (you can download it from tasvideos).
I'll see your four Mega Men, and raise you two.
...Though I can certainly understand the author's decision to do only one level. 😛
I'm aware of that one too.