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.

Due to its widespread distribution, Doom hence became the game that introduced deathmatching to a large audience ( and was also the first game to use the term " deathmatch ").

Gaining the first large mod-making community, Doom affected the culture surrounding first-person shooters, and also the industry.

The game's development and impact on popular culture is also the subject of the book Masters of Doom by David Kushner.

The weapons are also almost exact functional copies of those from Doom, with the same key bindings.

Heretic also features an improved version of the Doom engine, sporting the ability to look up and down within constraints, as well as fly.

Whereas Doom, Doom II, and Heretic rely on lines within the maps to perform simple actions, Hexen also allows these actions to be activated via Action Code Script ( ACS ).

Hexen is compatible with many Doom source ports ; Hexens features are also compatible with Doom WADs made for source ports regardless of what game they are being played on.

Id Software has also been associated with novels since the publication of the original Doom novels.

Hollenshead also mentioned that the title would be completely developed in-house, marking the first game since 2004's Doom 3 to be done so.

Id Software has also overseen several games using its technology that were not made in one of their IPs such as Shadowcaster, ( early-Id Tech 1 ), Heretic, Hexen ( Id Tech 1 ), Hexen II ( Quake engine ), and Orcs and Elves ( Doom RPG engine ).

Doctor Doom also uses robotic versions of himself to keep the peace while he's away.

In the Marvel 1602 storyline, Latveria is ruled by Count Otto von Doom, also known as Otto the Handsome.

He was also cast again by Daniel Abineri in the role of Johnny, in the stage musical Bad Boy Johnny and the Prophets of Doom in 1989.

Many elements of the 1939 film were also incorporated into Indiana Jones and the Temple of Doom.

Budgetary inflation also caused Temple of Doom to cost $ 28. 17 million, $ 8 million more than Raiders of the Lost Ark.

Under the guise of a friendly skateboarder, Wart also makes a minor appearance in the Nintendo Adventure Book Doors to Doom, when Mario and Luigi become lost in Subcon after travelling through a warp zone.

A second 20 minute pilot was filmed on 27 and 28 January 1987, with the name changed from Dungeon Doom to Knightmare, and ' life force ' added, an idea borrowed from the computer game Atic Atac, which also influenced the show in other ways.

The origin of the term deathmatch in the context of video games is disputed, especially as it is not well-defined ; for pointers, the term might have been coined by game designer John Romero while he and lead programmer John Carmack were developing the LAN multiplayer mode for the video game Doom, another source to investigate is the fighting game World Heroes 2, also developed and released in the early 1990s as an early use of the term.

The octagon in the garden also featured in Jeeves and the Impending Doom.

Lander also provided the voice of Smartass, the chief weasel of Judge Doom ’ s Toon Patrol in the 1988 film Who Framed Roger Rabbit.

Waltham Abbey is also renowned for its 15th-century Doom ( painting ).

It was widely ignored for its outdated Wolfenstein 3D engine, which was technologically surpassed by Doom at the time.

The game engine for Doom 3, id Tech 4, has been licensed out for the use of other developers, such as in Human Head Studios ' Prey, Raven Software's Quake 4, Splash Damage's Enemy Territory: Quake Wars, Raven Software's Wolfenstein and Splash Damage's Brink ; however id Tech 4 has not been widely licensed compared to Epic Games ' Unreal Engine.

The reception of Doom II was very positive, and it is widely regarded as a refinement of everything that made the original Doom good.

During this period, the PC was not yet widely recognised as a games platform in the UK, an attitude PC Zone arguably helped to change by championing a succession of notable games such as Star Control II, Star Wars: X-Wing, Ultima Underworld and Doom.

The PC version is widely considered to be significantly more difficult than Doom or Doom 2.

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.

His most widely read book is Doom Patrols, a " theoretical fiction " that outlines the state of postmodernism during the early 1990s, using poetic language, personal anecdotes, and creative prose.

The engine was designed by John Carmack, who also created previous engines such as those for Doom and Quake, which are also widely recognized as marking significant advances in the field.

Wolfenstein 3D was the first widely known FPS, and Doom was the first major breakthrough in graphics ; it used a number of clever techniques to make the game run fast enough to play on consumer-grade machines.