Press SPACEBAR to start playing game. Doom is a 1993 science fiction horror-themed first-person shooter video game by id Software. In Doom, players assume the role of a space marine, popularly known as "Doomguy", who must fight his way through the hordes of invading demons from Hell. The game is divided into three nine-level episodes. The Ultimate Doom, an updated release of the original game featuring the fourth episode, came out in 1995