Doom 64, developed and published by Midway San Diego, is a game for the N64 based on a heavily overhauled version of Doom. It features entirely new maps and graphics assets, and numerous changes to weapon and enemy behavior. It also adds two new enemy types and the Unmaker/Lasergun weapon, an unused idea from Doom's original design document. Due to the unwieldiness of the N64 controller, most players nowadays will opt to play the game through one of its PC ports.
A notable detail of the game is that the Doomguy is somewhat shorter than usual, only about as tall as an Imp's torso. This was presumably done to make enemies more intimidating.
Doom 64 has two, unofficial, PC ports. Doom 64 EX is the more accurate of the two; Doom 64: Absolution is, in fact, a total conversion of Doom II, and as such, certain concessions had to be made. This version includes six new stages.