Doom is a first-person shooter video game made by id Software in 1993. It is one of the first games to use 3 dimensional levels. The game is about killing demons and zombies. Doom has traps that will hurt you and sometimes make you die and fall to the ground. 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 John Carmack created.
Doom is split into three basic components, the engine, the Iwad file, and the optional Pwad file. The engine contains the code needed to run the game on a computer. The Iwad file contains the default levels, sounds, pictures, and other components. Pwad files contain custom levels.
Doom is a shareware game of three episodes of eight levels and one secret level. The episodes are Knee-Deep In The Dead, The Shores Of Hell and Inferno. In the shareware version the only episode that can be played is Knee-Deep In The Dead. The expansion pack of Doom is Ultimate Doom, which has the fourth episode, Thy Flesh Consumed.