Game You've Played the Most
This would probably have to be Sonic 2. Having limited games growing up, I tended to just play the same stuff over and over (Little Mermaid, Mario 3, Legend of Zelda, Adventure of Link, and Tetris), and I remember being particularly fond of Sonic 2. I don't recall if I ever actually beat it, but I did spend many hours entertaining myself with it. In actual fact, I may have spent more overall time on recent games that have taken me 80+ hours to beat, but I'm choosing Sonic 2 because of the sheer amount of times I replayed it. We're talking many days and several years. God, I still love the music and the gameplay :)