Oh me. I've played sooooo many games in my 26 years of life. How could I possibly ever make a choice for the Top 3?
1. Starcraft Broodwar (Starcraft II is also good, but I'm not gonna use 2 of my 3 spaces, just to include it)
2. Legend of Zelda - Ocarina of Time (years of my life taken up playing that game over and over and over and over and over... again, I would also include Legend of Zela - A Link to the Past, but I don't wanna use up 2 spaces for it)
3. Super Mario World (this was the 1st game I ever owned, and I have beaten it >30 times. I've done full 100% game completion on it.)
Oh how I wish I could've chosen more than 3... I feel like so much has been left out (especially new games).