With one third of the game ( 9 levels ) distributed as shareware, Doom was played by an estimated 10 million people within two years of its release, popularizing the mode of gameplay and spawning a gaming subculture ; as a sign of its effect on the industry, games from the mid-1990s boom of first-person shooters are often known simply as " Doom clones ".

According to GameSpy, Doom was voted by industry insiders to be the greatest game of all time in 2004.

The Doom franchise was continued with the follow-up Doom II: Hell on Earth ( 1994 ) and numerous expansion packs, including The Ultimate Doom ( 1995 ), Master Levels for Doom II ( 1995 ), and Final Doom ( 1996 ).

The series started to lose mainstream appeal as the technology of the Doom game engine was surpassed in the mid-1990s, although fans have continued making WADs, speedruns, and modifications to the original.

On May 7, 2008, following speculation by John Carmack at QuakeCon on August 3, 2007, Doom 4 was announced as in production.

This episode was developed by independent master level designers with id's approval, and was designed for expert Doom players seeking a major challenge.

In some versions of Doom II, both of these secret levels incorporate level design and characters from Dooms precursor, Wolfenstein 3D, which was also developed by id.

The advance from id Software's previous game Wolfenstein 3D was enabled by several new features in the Doom engine:

The use of darkness to frighten or confuse the player was nearly unheard of in games released prior to Doom.

Wolfenstein 3D was not designed to be expandable, but fans had nevertheless figured out how to create their own levels for it, and Doom was designed to further extend the possibilities.

The development of Doom was surrounded by much anticipation.

The large number of posts in Internet newsgroups about Doom led to the SPISPOPD joke, to which a nod was given in the game in the form of a cheat code.

The first public version of Doom was uploaded to Software Creations BBS and an FTP server at the University of Wisconsin – Madison on December 10, 1993.

Doom was released as shareware, with people encouraged to distribute it further.

They did so: in 1995, Doom was estimated to have been installed on more than 10 million computers.

In 1995, The Ultimate Doom ( version 1. 9, including episode IV ) was released, making this the first time that Doom was sold commercially in stores.

Some Id Software titles ported to Linux are Doom ( the first Id Software game to be ported ), Quake, Quake II, Quake III Arena, Return to Castle Wolfenstein, Wolfenstein: Enemy Territory, Doom 3, Quake 4, and Enemy Territory: Quake Wars.

Doom was ported to numerous platforms, inspired many knock-offs and was eventually followed by the technically similar Doom II.

On August 13, during the QuakeCon 2009 media conference, it was announced that Doom II would be ported to Xbox Live Arcade, and was released in May the following year.

Originally developed on NeXT computers, it was ported to DOS for Doom < nowiki >'</ nowiki > s initial release and was later ported to several game consoles and operating systems.

Doom is one of the most widely ported video games in the first-person shooter genre: starting with the original MS-DOS version ( released as shareware on December 10, 1993 ), it has been released officially for a number of computer operating systems, video game consoles, handheld game consoles, and other devices.

Doom was ported to IRIX during the summer of 1994 by Dave D. Taylor.

Doom was ported to Solaris in late 1994, and was designed to run with game files from Doom 1. 8.

The Ultimate Doom, Doom II and Final Doom were ported by Lion Entertainment and released by GT Interactive using a Mac OS launcher application to run original PC WADs.

Ninja Gaiden III: The Ancient Ship of Doom was ported by Tiger Electronics as an LCD handheld game.

Doom became a " killer app " that all capable consoles and operating systems were expected to have, and versions of Doom have subsequently been released for the following systems: DOS, Microsoft Windows, Linux, Apple Macintosh, Super NES, Sega 32X, Sony PlayStation, Game Boy Advance, iOS, Symbian OS, RISC OS, Atari Jaguar, Sega Saturn, Nintendo 64, Tapwave Zodiac, 3DO, Xbox, and Xbox Live Arcade.

The source code for the Linux version of Doom was released to the public in 1997 under a license that granted rights to non-commercial use, and was re-released under the GNU General Public License in 1999.

Since the majority of Doom players were DOS users the first step for a fan project was to port the Linux source code to DOS.

Although Doom was originally created for MS-DOS, the original source release was for the subsequent Linux version.

PrBoom is a Doom source port derived from Linux and Windows ports of Boom and MBF that includes an optional OpenGL renderer as well as options allowing it to restore the behavior of earlier executables ( such as Doom 1. 9, Boom, and MBF ) in essential ways.

DOSDoom was one of the first Doom source ports, created by taking the original Linux release of the Doom source code and porting it back to DOS.

Doom Legacy is a source port originally written as a fork of DOSDoom, introducing mouse-look, jumping, a console, 32-player deathmatch, skins, and, later, native Windows, Linux and Mac OS X ports.

Chocolate Doom is a source port for Windows, Linux, and other modern operating systems that is designed to behave as closely as possible to the original DOS executable (" Vanilla Doom "), going as far as to duplicate bugs found in the DOS executable, even bugs that make the game crash.

He created ports of both games to IRIX, AIX, Solaris and Linux, and helped program the Atari Jaguar ports of Doom and Wolfenstein 3D.

The last Linux Doom binaries were provided by id Software on October 13, 1996 through the company's ftp-server.

The source code to the Linux version of Doom was released by id Software on December 23, 1997 under a non-profit End user license agreement, it was re-released on October 2, 1999 under the terms of the GNU General Public License.

* October 10 — id Software releases Doom II and Dave D. Taylor creates a Linux port of the original Doom, becoming the first major game for the new operating system.

GtkRadiant 1. 5. x can be used to make Doom 3 maps in Linux, by utilizing Doom 3's integrated map compiler in conjunction.

Doom ( typeset as DOOM in official documents ) is a 1993 science fiction horror-themed first-person shooter video game by id Software.

On June 26, 2009, John Carmack released Doom Resurrection, a new game developed by Escalation Studios for iOS and published by id Software.

Many versions of Doom ( and its sequels ) include secret levels which are accessed by the player discovering alternate exits, often hidden behind secret doors or in areas which are difficult to reach.

Another important feature of the Doom engine is its modular data files, which allow most of the game's content to be replaced by loading custom WAD files.

This prediction came true at least in part: Doom became a major problem at workplaces, both occupying the time of employees and clogging computer networks with traffic caused by deathmatches.

At the Microsoft campus, Doom was by one account equal to a " religious phenomenon ".

The network problems caused by Doom can be largely attributed to Doom versions 1. 1 and prior using " broadcast " packets, which must be processed by every computer on the network segment regardless of whether or not it's actually playing the game.

This was fixed in Doom version 1. 2 and later by using unicast packets.

Doom was not the first first-person shooter with a deathmatch mode — Maze War was a multiplayer FPS in 1973, and by 1977 was running over ethernet on Xerox computers.

Although the majority of WADs contain one or several custom levels mostly in the style of the original game, others implement new monsters and other resources, and heavily alter the gameplay ; several popular movies, television series, other video games and other brands from popular culture have been turned into Doom WADs by fans ( without authorization ), including Aliens, Star Wars, The X-Files, The Simpsons, South Park, Sailor Moon, Dragon Ball Z, Red Faction, The Thing, Pokémon and Batman.

The phrase " Doom clone | Doom clone " was initially popular to describe the style of gameplay in Doom-like games, but after 1996 was gradually replaced by " first-person shooter " By 1998 the phrase " first-person shooter " had firmly superseded " Doom clone "