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There, he works alongside the Union Aerospace Corporation (UAC), a multi-planetary conglomerate and military contractor performing secret experiments on interdimensional travel. The player takes the role of a marine (unnamed to further represent the person playing), "one of Earth's toughest, hardened in combat and trained for action", who has been incarcerated on Mars after assaulting a senior officer when ordered to fire upon civilians. Doom also offers a low-detail mode (double-width pixels, effectively halving horizontal resolution at the same 320x200 output) and variable screen sizes as measures for improving frame rates on slower PCs, such as those with an 80386 processor.ĭoom has a simple plot its background is given in the instruction manual, and the in-game story advances mainly through short messages displayed between the game's episodes. Id's programmers had to make use of several tricks for these features to run smoothly on 1993-vintage personal computers. Most significantly, Doom levels are not truly three-dimensional: they are internally represented on a two-dimensional plane, with height differences added separately (a similar trick is still used by many games to create huge outdoor environments). The player is kept on guard by the grunting and snarling of monsters, and receives occasional clues to the locations of secret areas by hearing hidden doors open remotely. A stereo sound system, which makes it possible to roughly tell the direction and distance of a sound's origin.
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![doom 2 cover doom 2 cover](https://static.wikia.nocookie.net/doom/images/b/b1/Doom_novel_4.jpg)
There is a scene in " The Color of Money" where Tom Cruse shows up at a pool hall with a custom pool cue in a case.