Mike Tyson: Punchout! on the NES. I played many games as a kid and some of my best memories were playing this one. Of course like most who played this once you mastered the "fastest" way to beat each character it lost a lot of its appeal. But the thing was back then you had to know someone who had bought the "cheat books" or had a subscription of some kind to figure it out. The internet ruined some games in that aspect. Played this just the other day on my old NES and managed to make it to Sandman without being knocked down. I don't have the skills I used to in order to finish it though :/