I came across this on the weekend by accident really, and it's just like the street fighter hacked pcb board where they got the air fireballs from. This on the other hand lets you play as the enemies in the game, has a special meter that lets you throw bombs, and has weird effects when you pick up certain items....it's pretty fun too.
http://www.youtube.com/watch?v=9RhgvxADzZg
http://www.youtube.com/watch?v=9RhgvxADzZg