Aside from Mario Brothers 3, that just looked damn nice.
For my Single Player submission, it's "Felix the Cat" by Hudson soft hands freaking down. I ran into that game by accident back in 97' just damned fun game.
More fun I had with co op would have to be "Indy Heat", or maybe "Tecmo Football" (and I hate sports games in general but damn it was fun). With Indy Heat me and my nephew would block/kick/set fire to the star of the game Danny Sullivan's ass because he would cheat SOOOOOOO bad, had like unlimited Nitro Boosts, or kick him out of the pit early to give an end game chance during the last laps.
TAKE THAT DANNY SULLIVAN!