Doom (1993 video game)

DOOM is a first person shooter game published by ID Software in 1993.

It introduced the concept of playing over a network together (cooperation mode) or against each other (deathmatch mode) into the genre of first person shooter games.

The source code of DOOM was published by ID Software in 1997 under a proprietary license. The game was then ported on to various other operating systems. In late 1999, the license was changed to the GPL. A sequel, DOOM II was released at the end of the third quarter in 1994. There are several websites still in operation with information and news about DOOM and DOOM II. Some of the larger sites are http://www.doomworld.com, http://www.doomcenter.com, and http://www.newdoom.com.