Wolfenstein 3D (often incorrectly credited as the first,
first person shooter) is an
FPS game for DOS computers created by ID, who are the creators of DOOM, as well Quake, and even FPS games before wolfenstein.
The game consists of fighting
nazis, mutants, dogs (or giant rats in the crappy
nintendo version) and several larger
boss enemies, including
Hitler and Hans Grosse.
The game is extremely historically accurate as well.
I am playing wolfenstein 3D blasting away nazis with a chaingun, woot.