Wolfenstein 3D (id Software)
Finally, here we are, at the game that may not have been the first first-person shooter, but the game that inarguably defined the FPS genre. Building on the tech developed for Hovertank 3D and Catacomb 3D the year before, Carmack and id Software gave us the fastest, smoothest first-person 3D anyone had ever seen. And they gave us Nazis and Mecha-Hitler to shoot. The FPS was born. Except even in 1992 we hadn’t yet started calling them first-person shooters. That would come later.