Wolfenstein 3D was the game that kick-started the modern FPS genre. At time it was released, id Software was a relatively unknown company. Playing as a Polish-American prisoner, you break out of the Wolfenstein prison, kill hundreds of Nazis, and eventually take on Adolf Hitler in a robot suit. Yeah, it's just as crazy as it sounds. You can get a glimpse of the original game in this year's Wolfenstein: The Old Blood, as you get to play levels from the classic in dream sequences.