#14 - Sonic Adventure 2 (Dreamcast)
Used to lock myself away for hours as a kid and play this. In terms of controls and level design, I don't think there is a better platformer out there. The game gave you a real sense of control and Sonic wasn't overbearingly fast, unlike most of the 3D Sonic games released in the past decade. The soundtrack is awesome and the graphics were incredible. One of the final levels set in orbit around the Earth blew me away.