The source code was released in 1997 under a proprietary license, and then later in 1999 under the GNU General Public License v2.0 or later. The Doom franchise continued with Doom II: Hell on Earth (1994) and expansion packs including Master Levels for Doom II (1995). Its graphic violence and hellish imagery drew controversy.ĭoom has been ported to numerous platforms. It pioneered online distribution and technologies including 3D graphics, networked multiplayer gaming, and support for custom modifications via packaged WAD files. Along with its predecessor Wolfenstein 3D, it helped define the FPS genre and inspired numerous similar games, often called Doom clones.

An updated version with an additional episode and more difficult levels, The Ultimate Doom, was released in 1995 and sold at retail.ĭoom is one of the most significant games in video game history, frequently cited as one of the greatest games ever made. The first episode, comprising nine levels, was distributed freely as shareware and played by an estimated 15–20 million people within two years the full game, with two further episodes, was sold via mail order. Players assume the role of a space marine, popularly known as Doomguy, fighting his way through hordes of invading demons from Hell. Doom is a 1993 first-person shooter (FPS) game developed by id Software for MS-DOS.

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