Doom is a first-person shooter video game made by id Software in 1993. It is one of the first games to use three-dimensional levels. The game is about killing demons and zombies in order to stop an invasion. Doom has traps, including crushing ceilings, radiation pools, and exploding barrels, that can kill the player. Doom was also the first game with multiplayer deathmatch. This means you can fight with other players instead of the demons and zombies. The game was made with a computer language called C using some new techniques created by John Carmack.