"Doom Construction Kit: Mastering and modifying Doom" was one of many guide books for creating WADs. It included a CD with editing programs and complete WADs that could be played or studied.

Doom WADs are mods for the computer game Doom or its sequel Doom II, standing for Where's All the Data?. Immediately after its release in 1993, Doom attracted a sizeable following of players who created their own WAD files — packages containing levels, graphics and other game data — and played a vital part in spawning the mod-making culture which is now commonplace for first-person shooters. Literally thousands of WADs, ranging from single custom levels to full original games, have been created for Doom; most of these can be downloaded for free over the Internet. Several WADs have also been released commercially, and for some people the WAD-making hobby became a gateway to a professional career as a level designer. Cover for Doom Construction Kit, a guide for creating Doom WADs. ... Cover for Doom Construction Kit, a guide for creating Doom WADs. ... CD redirects here; see Cd for other meanings of CD. Image of a compact disc (pencil included for scale) A compact disc (or CD) is an optical disc used to store digital data, originally developed for storing digital audio. ... Sandbox Editor for Crysis UnrealEd is the level editor for Epics Unreal series of first-person shooters. ... This article does not cite any references or sources. ... “Computer and video games” redirects here. ... Doom (or DOOM)[1] is a 1993 computer game by id Software that is a landmark title in the first-person shooter genre. ... Doom II: Hell on Earth is a first-person shooter video game created by id Software. ... Year 1993 (MCMXCIII) was a common year starting on Friday (link will display full 1993 Gregorian calendar). ... In computer and video games, a level (sometimes called a stage, course, episode, round, world, map, wave, board, phase, or landscape) is a separate area in a games virtual world, in modern games typically representing a specific location such as a building or a city. ... This article needs additional references or sources for verification. ... Maze War, one of the two candidates for the first FPS. This article is about the video game genre. ... This article does not cite any references or sources. ... A hobby is a spare-time recreational pursuit. ... This article or section does not cite its references or sources. ... A level designer is a person who creates levels, challenges or missions for computer and/or video games using a specific set of programs. ...

There are two types of WADs: PWADs and IWADs. IWADS contain the data necessary to load the game, while PWADs contain additional data, such as new character sprites, as necessary for custom levels.

History

Extensibility in Doom

When developing Doom, id Software was aware that many players had tried to create custom levels and other modifications for their previous game, Wolfenstein 3D. However, the procedures involved in creating and loading modifications for that game were cumbersome. Doom (or DOOM)[1] is a 1993 computer game by id Software that is a landmark title in the first-person shooter genre. ... id Software (IPA: officially, though originally ) is an American computer game developer based in Mesquite, Texas, a suburb of Dallas. ... In computer and video games, a level (sometimes called a stage, course, episode, round, world, map, wave, board, phase, or landscape) is a separate area in a games virtual world, in modern games typically representing a specific location such as a building or a city. ... Wolfenstein 3D (commonly abbreviated to Wolf 3D) is the computer game that started the first person shooter genre on the PC. It was created by id Software and published by Apogee Software on May 5, 1992. ...

John Carmack, lead programmer at id Software, designed the Doom internals from the ground up to allow players to extend the game. For that reason, game data such as levels, graphics, sound effects and music are stored separately from the game engine, in "WAD files". According to Doom's initial design document, WAD stands for "Where's All the Data?". John D. Carmack II (born August 20, 1970) is a widely recognized figure in the video game industry. ... This article needs additional references or sources for verification. ... Sound effects or audio effects are artificially created or enhanced sounds, or sound processes used to emphasize artistic or other content of movies, video games, music, or other media. ... // Music is an art form consisting of sound and silence expressed through time. ... A game engine is the core software component of a computer or video game or other interactive application with real-time graphics. ... To meet Wikipedias quality standards, this article or section may require cleanup. ...

The idea of making Doom easily modifiable was primarily backed by Carmack, a well-known supporter of copyleft and the hacker ideal of people sharing and building upon each other's work, and by John Romero, who had hacked games in his youth and wanted to allow other gamers to do the same. Not everybody in the id Software crew was happy with this development; some, including Jay Wilbur and Kevin Cloud, objected due to legal concerns and in the belief that it would not be of any benefit to the company's business. The reversed c in a full circle is the copyleft symbol. ... Hacker, as it relates to computers, has several common meanings. ... Alfonso John Romero (born October 28, 1967 in Colorado Springs, Colorado) is a well-known game designer, programmer, and developer in the video game industry. ... Kevin Cloud is a computer games graphic designer. ...

Utilities and WADs appearing

The Doom Editing Utility was the first of many programs allowing people to create their own Doom levels.

Immediately after the initial shareware release of Doom, on December 10, 1993, enthusiasts began working on tools to modify the game. On January 26, 1994, the first version of the Doom Editing Utility, a program created by Doom fans which made it possible to create entire new levels, was uploaded to the Internet, and many other editing programs followed. (Carmack additionally released the source code for the utilities used to create the game, but these were programmed in Objective-C, for NeXT workstations, and were therefore not directly usable for most people, who were PC users.) Image File history File links Doom Editor Utility screenshot. ... Image File history File links Doom Editor Utility screenshot. ... DEU (Doom Editing Utility) allows the creation and editing of WAD files for use with id Softwares computer game Doom. ... Look up shareware in Wiktionary, the free dictionary. ... December 10 is the 344th day (345th in leap years) of the year in the Gregorian calendar, 21 days before the next year. ... Year 1993 (MCMXCIII) was a common year starting on Friday (link will display full 1993 Gregorian calendar). ... is the 26th day of the year in the Gregorian calendar. ... Year 1994 (MCMXCIV) was a common year starting on Saturday (link will display full 1994 Gregorian calendar). ... DEU (Doom Editing Utility) allows the creation and editing of WAD files for use with id Softwares computer game Doom. ... Source code (commonly just source or code) is any series of statements written in some human-readable computer programming language. ... Objective-C, often referred to as ObjC or more seldomly as Objective C or Obj-C, is an object oriented programming language implemented as an extension to C. It is used primarily on Mac OS X and GNUstep, two environments based on the OpenStep standard, and is the primary language... For other meanings, see Next. ... IBM PC (IBM 5150) with keyboard and green screen monochrome monitor (IBM 5151), running MS-DOS 5. ...

Soon, countless hobbyists were building custom WADs and sharing them over AOL and CompuServe forums, and other Internet-based channels. Many of the WADs were in the style of the stock game, others were based on TV series, movies, or original themes. Some of the id Software staff have revealed that they were impressed by some of the WADs; John Carmack later said the following about a Star Wars-themed modification: It has been suggested that AOL search data scandal be merged into this article or section. ... CompuServe, (in full, CompuServe Information Services, or CIS), was the first major commercial online service in the United States. ... Television series redirects here. ... “Moving picture” redirects here. ... John D. Carmack II (born August 20, 1970) is a widely recognized figure in the video game industry. ... Star Wars is an epic space opera saga and a fictional universe initially developed by George Lucas during the 1970s and expanded since that time. ...

"I still remember the first time I saw the original Star Wars DOOM mod. Seeing how someone had put the death star into our game felt so amazingly cool. I was so proud of what had been made possible, and I was completely sure that making games that could serve as a canvas for other people to work on was a valid direction."^[1]

Another particularly notable early modification is the Aliens TC (see below in the conversions section), based on the movie Aliens. Aliens is a 1986 science fiction movie starring Sigourney Weaver, Michael Biehn, Lance Henriksen, Carrie Henn, Bill Paxton and Paul Reiser. ...

Even though WADs which transformed the game by replacing graphics and sounds were somewhat limited; much of the game's behaviour, including the timing and power of weapons and enemies, was hard-coded in the Doom executable file and impossible to alter from WADs. One program called DeHackEd addressed this fact by letting users modify parameters inside the Doom executable itself. DeHackEd is an editor originally created for Dooms original EXE that allows the operation of the executable to be changed. ...

Commercial WADs

"The Doom Hacker's Guide" by Hank Leukart, who also created and maintained the official Doom FAQ

Around 1994 and 1995, WADs were distributed primarily through BBSs and via CD collections found in computer shops or bundled together with instruction guides for level creation (in later years Internet FTP servers became the primary method for obtaining these works). Although the Doom software license required that no profit be made from custom WADs, such CD compilations could be sold as long as the price only covered distribution costs. Image File history File links Download high resolution version (525x694, 118 KB)Cover for The Doom Hackers Guide, a guide for creating Doom WADs. ... Image File history File links Download high resolution version (525x694, 118 KB)Cover for The Doom Hackers Guide, a guide for creating Doom WADs. ... FAQ is an abbreviation for Frequently Asked Question(s). The term refers to listed questions and answers, all supposed to be frequently asked in some context, and pertaining to a particular topic. ... Year 1994 (MCMXCIV) was a common year starting on Saturday (link will display full 1994 Gregorian calendar). ... Year 1995 (MCMXCV) was a common year starting on Sunday (link will display full 1995 Gregorian calendar). ... Ward Christensen and the computer that ran one of the first public Bulletin Board Systems, CBBS from BBS: The Documentary “BBS” redirects here. ... CD may stand for: Compact Disc Canadian Forces Decoration Cash Dispenser (at least used in Japan) CD LPMud Driver Centrum-Demokraterne (Centre Democrats of Denmark) Certificate of Deposit České Dráhy (Czech Railways) Chad (NATO country code) Chalmers Datorförening (computer club of the Chalmers University of Technology) a 1960s... “FTP” redirects here. ...

id Software was at the time working on their next game Quake, using new technology, but started side projects picking up some of the most talented WAD makers from the community to create official expansions and compete with the unauthorized collection CDs. The team produced the 21 Master Levels, which on December 26, 1995 were released on a CD along with Maximum Doom, a collection of 1,830 WADs that had been downloaded arbitrarily from the Internet. In 1996, Final Doom, a package of two 32-level sets created by TeamTNT, was released as an official id Software product. Zombies attacking the player at the starting of Episode 1, Mission 3: The Necropolis. ... The Master Levels for Doom II was released on 26 December 1995 by id Software as an expansion pack for the computer game Doom II. The CD contains twenty WAD files created by various authors under contract. ... is the 360th day of the year (361st in leap years) in the Gregorian calendar. ... Year 1995 (MCMXCV) was a common year starting on Sunday (link will display full 1995 Gregorian calendar). ... Year 1996 (MCMXCVI) was a leap year starting on Monday (link will display full 1996 Gregorian calendar). ... Final Doom is a first-person shooter computer game that uses the game engine, items and characters from Doom II. It consists of two 32-level megawads (level files), TNT: Evilution by brothers Dario and Milo Casali and TeamTNT, and The Plutonia Experiment by the Casali brothers. ... TeamTNT is a group of mappers that created the TNT: Evilution episode of Final Doom, as well as several free level packs and developer resources for Doom II. TeamTNT is responsible for development of the BOOM and Boom-DM Engines used by many level designers during the height of Doom...

Additionally, a handful of first-person shooter games released at the time used the Doom engine under a commercial license from id Software, as such essentially being custom WADs packaged with the Doom engine. An example is the 1997 release HacX. For the band, see 1997 (band). ...

In addition to the many people who contributed to commercially released WADs, some authors became involved with the development of other games:

• Tim Willits, who contributed two Master levels, later became the lead designer at id Software
• Dario Casali, author of a quarter of Final Doom, was hired by Valve Software to work on Half-Life
• Sverre Kvernmo, designer of five Master levels and member of TeamTNT, was hired by Ion Storm for Daikatana
• Iikka Keränen, author of several Doom WADs and later Quake mods, was hired by Ion Storm to create levels for Anachronox and Daikatana, and by Looking Glass Studios to create levels for Thief 2. Keränen was later hired by Valve Software
• John Anderson^[2] (level designer), also known as "Dr Sleep", author of five Master levels and E4M7 of Ultimate Doom, later worked on Blood, Unreal and Daikatana
• Matthias Worch (level designer), joined Ritual Entertainment to work on SiN. He later contributed to the Unreal series.

Tim Willits by his workstation Tim Willits is the lead designer at the game developer id Software. ... id Software (IPA: officially, though originally ) is an American computer game developer based in Mesquite, Texas, a suburb of Dallas. ... Brothers Dario and Milo Casali are best-known as for creating The Plutonia Experiment, one of two stand-alone megawads for the Doom expansion, Final Doom. ... Final Doom is a first-person shooter computer game that uses the game engine, items and characters from Doom II. It consists of two 32-level megawads (level files), TNT: Evilution by brothers Dario and Milo Casali and TeamTNT, and The Plutonia Experiment by the Casali brothers. ... Valve Software is a Bellevue, Washington-based video game developer made famous by its first product, Half-Life, which was released in November 1998. ... Half-Life For a quantity subject to exponential decay, the half-life is the time required for the quantity to fall to half of its initial value. ... A solar wind is a stream of particles (mostly high-energy protons ~ 500 keV) which are ejected from the upper atmosphere of a star (in the case of a star other than the Earths Sun, it may be called a stellar wind instead). ... This article or section does not adequately cite its references or sources. ... Iikka Keränen, a native of Finland, lives in Kirkland, Washington and is a level designer at Valve Software. ... Zombies attacking the player at the starting of Episode 1, Mission 3: The Necropolis. ... Anachronox (pronounced ) is a 3-D, third person computer role-playing game produced by Tom Hall and the Ion Storm games studio and released in 2001. ... This article or section does not adequately cite its references or sources. ... Looking Glass Studios was a computer game development company during the 1990s. ... Thief is a series of mainly first-person computer games where the player takes the role of Garrett, a thief in a steampunk world resembling a cross between the Late Middle Ages and the Victorian era, with some primitive technology thrown in. ... Blood is a PC game developed by Monolith Productions and distributed by GT Interactive. ... Unreal is a first-person shooter computer game developed by Epic Games and published by GT Interactive (now owned by Atari) on May 22, 1998. ... This article or section does not adequately cite its references or sources. ... Matthias Worch (born 1976) is a German video game designer and computer graphics artist who works for Factor 5. ... Ritual Entertainment is a computer game software developer established in 1996 and based in Dallas, Texas. ... For other uses, see Sin (disambiguation). ... Unreal is a first-person shooter computer game developed by Epic Games and published by GT Interactive (now owned by Atari) on May 22, 1998. ...

The source port era

Around 1997, interest in Doom WADs began to decline, as attention was drawn to newer games with more advanced technology and yet more customizable design, including id's own Quake. For the band, see 1997 (band). ... Zombies attacking the player at the starting of Episode 1, Mission 3: The Necropolis. ...

In late 1997, id Software released the source code to the Doom engine (initially under a restrictive license; it was however released again under the terms of the GNU GPL). With the source code available, it became possible for programmers to modify any aspect of the game, remove technical limitations and bugs, and add entirely new features. Doom Engine is a psychedelic doom metal band based in Oxfordshire. ... GPL redirects here. ... A software bug is an error, flaw, mistake, failure, or fault in a computer program that prevents it from behaving as intended (e. ...

These engine modifications, or Doom source ports, have since become the target for much of the WAD editing activity (although some purists prefer the original, unmodified engine). As of 2004, several source ports are still actively developed, and Doom retains a following of people who still create WADs. A Doom source port is a source port of the Doom engine, the game engine used by the computer game Doom. ... Year 2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar. ...

• Versions and ports of Doom

The Doom logo. ...

Types of modifications

Levels and level packs

The most common kind of WAD consists of a single level, usually retaining theme of the original game, but possibly including new music and some modified graphics to define a more unique setting or mood. Both single-player and deathmatch multiplayer levels are common. Look up level in Wiktionary, the free dictionary. ... This article does not cite any references or sources. ... Deathmatch (abbreviated DM) is a widely-used gameplay mode very well integrated into first-person shooter computer games. ... Online gaming redirects here. ...

Also common are WADs which contain several levels, sometimes in the form of an episode, replacing some 8-10 levels, and sometimes in the form of a megawad, which replaces all or most levels in the game (36 in Doom, 32 in Doom II).

Megawads often represent the work of several people over several months and in some cases years.

Conversions

WADs which change the appearance or behavior of weapons, enemies, etc, are called conversions. There are partial conversions (PCs) which modify some parts of the game, and total conversions (TCs) which change most or everything in the game, including levels, enemies, weapons, and possibly even the basic gameplay (e.g. Chex Quest). Chex Quest is a total conversion of the computer game Doom (specifically Ultimate Doom). ...

Notable WADs

The following is a non-inclusive listing of highly popular, unique or historically significant WADs that may be considered uncontroversial in its selection. See the external links section below for alternative lists and review sites.

Megawads

• Eternal Doom is a set of levels for Doom II created by TeamTNT after Final Doom, released non-commercially in several versions — the final one on 14 November 1997. Eternal Doom places the player and the original Doom's demons in 34 levels varyingly in the theme of medieval castles and futuristic high-tech bases, featuring a time travel sub-plot. A distinguishing aspect of Eternal Doom is the size of the levels, the average being about four times the size of the levels in Doom and Doom II. Eternal Doom has been praised for the levels' grand architecture and complex layouts, but the size of some of the largest castles, combined with level design which sometimes forces the player to travel back and forth between switches located around the map — often difficult to find, has also been subject to criticism.
• Memento Mori and Memento Mori 2
• Requiem
• Hell Revealed (May 1997) is a 32-level megawad for Doom II created by Yonatan Donner, one of the players behind the Doom Done Quick speedrunning project, and Haggay Niv. It was designed with the intent of providing a challenge for expert players, and has become infamous for its difficulty: the hardest levels in the set feature battlegrounds where the player is pitted against dozens of the hardest monsters at once, some levels containing around 500 monsters in total. Second to the original games Doom and Doom II, Hell Revealed has been subject to the most Doom speedrunning competition of any Doom WAD. A sequel built around the same concept and featuring yet more monsters, Hell Revealed 2, was created by a different team and released December 31, 2003.
• 10 Sectors started as a competition at Doomworld, where entrants were challenged to make the best level they could for the BOOM source port using only 10 sectors, with the winner, Michal Mesko, receiving a Voodoo 5 5500 AGP graphics card.
• Alien Vendetta
• NeoDoom
• CoopBuildLM is a large WAD consisting of 32 maps that pits Internet players cooperatively against hundreds and hundreds of demons, with Doom II weapon spawns placed throughout maps, locked doors blocking exits, etc. It is not uncommon to find 10 or 12 Cyberdemons guarding a single switch; indeed, at least 3 maps consist almost entirely of hundreds of Cyberdemons. This WAD is very popular on ZDaemon.

TeamTNT is a group of mappers that created the TNT: Evilution episode of Final Doom, as well as several free level packs and developer resources for Doom II. TeamTNT is responsible for development of the BOOM and Boom-DM Engines used by many level designers during the height of Doom... is the 318th day of the year (319th in leap years) in the Gregorian calendar. ... For the band, see 1997 (band). ... The Middle Ages formed the middle period in a traditional schematic division of European history into three ages: the classical civilization of Antiquity, the Middle Ages, and modern times. ... For other uses, see Castle (disambiguation). ... Time travel is a concept that has long fascinated humanity—whether it is Merlin experiencing time backwards, or religious traditions like Mohammeds trip to Jerusalem and ascent to heaven, returning before a glass knocked over had spilt its contents. ... Section of the dome of Florence Cathedral. ... For the band, see 1997 (band). ... A speedrun is a play-through of a computer or video game, the whole game or a selected part such as a single level of it, with the intent of completing it as quickly as possible. ... ... is the 365th day of the year (366th in leap years) in the Gregorian calendar. ... Year 2003 (MMIII) was a common year starting on Wednesday of the Gregorian calendar. ... Doomworlds front page Doomworld is the oldest unofficial news website dedicated to the computer game Doom, having been founded in 1998. ... Boom was a port of the Doom source code by TeamTNT (who also made the Evilution level set in Final Doom). ... ZDaemon is a modified Doom source port based on ZDoom for both Windows and *NIX (server only at this time), purposely-built for playing multiplayer games of Doom over the internet. ...

Total conversions

Batman Doom exchanges the Doom space marine for the Dark Knight and the hell-infested cities in Doom II for Gotham City.

• Aliens TC (1994) by Justin Fisher, based on the movie Aliens, was the first total conversion and is one of the most famous: in the week following the release of Doom II, there was more discussion in the Doom newsgroups related to Aliens TC than Doom II. The popularity of the Aliens TC even reached outside the Doom community, for instance providing inspiration for the 1998 Dreamworks game Jurassic Park: Trespasser. Fisher was offered employment by various game developers (including Dreamworks for the team that would later make Trespasser), but declined in order to finish his university degree. Batman Doom (a DOOM WAD) screenshot. ... Batman Doom (a DOOM WAD) screenshot. ... Space Marines are fictional soldiers that operate in outer space. ... Batman (originally referred to as the Bat-Man and still referred to at times as the Batman) is a DC Comics fictional superhero who first appeared in Detective Comics #27 in May 1939. ... For other uses, see Hell (disambiguation). ... This article is about the fictional place. ... Year 1994 (MCMXCIV) was a common year starting on Saturday (link will display full 1994 Gregorian calendar). ... Aliens is a 1986 science fiction movie directed by James Cameron and starring Sigourney Weaver, Michael Biehn, Lance Henriksen, Carrie Henn, Bill Paxton and Paul Reiser. ... Doom II: Hell on Earth is a first-person shooter video game created by id Software. ... A newsgroup is a repository usually within the Usenet system, for messages posted from many users at different locations. ... Year 1998 (MCMXCVIII) was a common year starting on Thursday (link will display full 1998 Gregorian calendar). ... This article is about the film studio. ...

  
  The Aliens TC was noted for its suspenseful atmosphere. The first level is devoid of enemies, a surprising feature considering the fast-paced action of Doom. Later on, however, the players faces the aliens and even gets to use the powerloader from Aliens as a weapon. Fisher had gotten the idea to create the Aliens TC within his first five minutes of playing Doom in late December 1993, noting a similarity in atmosphere of Doom and the movie. Incidentally, it has later become known that id Software originally planned to base Doom on an Aliens license, but abandoned the idea in the early stages of development. The xenomorph as it appears in Alien vs. ... Year 1993 (MCMXCIII) was a common year starting on Friday (link will display full 1993 Gregorian calendar). ...

• Batman Doom uses characters and locations from the world of the comic book superhero Batman.
• Chex Quest - A total conversion made so DOOM can be approved for children. This was packaged in Chex cereal boxes, however when the promotion ended fans put Chex Quest up for download on the Internet.
• Doom 64 TC is a replication of Doom 64, the Nintendo 64 version of Doom, which contains different levels, graphics and sounds.

FreeDoom

• FreeDoom is a project to create a free replacement (modified BSD License) for the set of graphics, sound effects, music and levels (and miscellaneous other resources) used by Doom. Since the Doom engine is free software, it can be distributed along with the new resources, in effect providing a full game that is free. FreeDoom would also allow users to play any of the thousands of other WADs that normally require the original game.
• Sonic Robo Blast 2 is a modification of the Doom engine, that turns it from a first-person shooter into a third-person platformer based on Sonic the Hedgehog.
• Goldeneye Doom 2 Total Conversion is a modification of Doom 2 that adds elements from the Nintendo 64 game Goldeneye 007.
• The Darkest Hour is a 7-level modification of Doom 2 that puts the player in the Star Wars universe. It was followed by a 5-level "prequel" called Dawn: A Prelude.

A comic book is a magazine or book containing the art form of comics. ... For the Aqua Teen Hunger Force episode, see Super Hero (Aqua Teen Hunger Force episode). ... Batman (originally referred to as the Bat-Man and still referred to at times as the Batman) is a DC Comics fictional superhero who first appeared in Detective Comics #27 in May 1939. ... Chex Quest is a total conversion of the computer game Doom (specifically Ultimate Doom). ... A box of Corn Chex. ... Doom 64 is a video game for the Nintendo 64 released by Midway Games in 1997. ... The Nintendo 64 ), often abbreviated as N64, was Nintendos third home video game console for the international market. ... Image File history File links Freedoom_aaa. ... Image File history File links Freedoom_aaa. ... Clockwise from top: The logo of the GNU Project (the GNU head), the Linux kernel mascot Tux the Penguin, and the FreeBSD daemon Free software is a term coined by Richard Stallman and the Free Software Foundation[1] to refer to software that can be used, studied, and modified without... The BSD license is a permissive license and is one of the most widely used free software licenses. ... For the journal by ACM SIGGRAPH, see Computer Graphics (Publication). ... Sound effects or audio effects are artificially created or enhanced sounds, or sound processes used to emphasize artistic or other content of movies, video games, music, or other media. ... // Music is an art form consisting of sound and silence expressed through time. ... In computer and video games, a level (sometimes called a stage, course, episode, round, world, map, wave, board, phase, or landscape) is a separate area in a games virtual world, in modern games typically representing a specific location such as a building or a city. ... Doom Engine is a psychedelic doom metal band based in Oxfordshire. ... Clockwise from top: The logo of the GNU Project (the GNU head), the Linux kernel mascot Tux the Penguin, and the FreeBSD daemon Free software is a term coined by Richard Stallman and the Free Software Foundation[1] to refer to software that can be used, studied, and modified without... This article is about the video game character. ... The Nintendo 64 ), often abbreviated as N64, was Nintendos third home video game console for the international market. ... GoldenEye 007 is a 1997 first-person shooter video game developed by Rareware for the Nintendo 64 video game console, and based on the 1995 James Bond film GoldenEye. ... Star Wars is an epic space opera saga and a fictional universe initially developed by George Lucas during the 1970s and expanded since that time. ...

Miscellaneous

• Doomsday of UAC (also known as UAC_DEAD after the file name) by Leo Martin Lim, released June 23, 1994, featured what was considered one of the most realistic environments of the time. Exploiting an until-then unknown bug in the Doom engine's rendering code, it also introduced a special effect in the form of an "invisible bridge"; this trick has been used extensively later on.
• The Harris levels. Levels created by Eric Harris, Columbine Shooter.

is the 174th day of the year (175th in leap years) in the Gregorian calendar. ... Year 1994 (MCMXCIV) was a common year starting on Saturday (link will display full 1994 Gregorian calendar). ... The Harris levels are levels created by Eric Harris, one of the two teen gunmen in the Columbine High School massacre, for the interactive computer game Doom. ...

Editors

Many level editors are available for Doom. The original Doom Editing Utility has been ported to a number of operating systems, but lost significance over time; however, many of today's editors still have their roots in DEU and its editing paradigm, including DETH, DeePsea, Linux Doom Editor, and Yadex. Other level editors include WadAuthor and the relatively young Doom Builder (initially released in summer 2003), which, among other things, features a 3D editing mode. Sandbox Editor for Crysis UnrealEd is the level editor for Epics Unreal series of first-person shooters. ... DEU (Doom Editing Utility) allows the creation and editing of WAD files for use with id Softwares computer game Doom. ... // An operating system (OS) is the software that manages the sharing of the resources of a computer. ... Doom Builder is an editor for the computer game Doom with support for both vertex and linedef based editing styles. ... Year 2003 (MMIII) was a common year starting on Wednesday of the Gregorian calendar. ...

A number of other, specialized editors also were created over time to modify graphics and sound lumps, most notably Wintex and XWE. Things, such as monsters and items, and weapon behavior can also be modified to some degree using the executable patching utility DeHackEd. DeHackEd is an editor originally created for Dooms original EXE that allows the operation of the executable to be changed. ...

The utility Slige can be used to automatically generate random maps. Slige is a random level generator for the computer game Doom. ...

Notes

Guide books

• Joseph Bell, David Skrede: The Doom Construction Kit: Mastering and Modifying Doom, Waite Group Press (April 1, 1995), ISBN 1-57169-003-4
• Hank Leukart: The Doom Hacker's Guide, Mis Press (March 1, 1995), ISBN 1-55828-428-1
• Steve Benner, et al.: 3D Game Alchemy for Doom, Doom II, Heretic and Hexen, SAMS Publishing (1996), ISBN 0-672-30935-1

is the 91st day of the year (92nd in leap years) in the Gregorian calendar. ... Year 1995 (MCMXCV) was a common year starting on Sunday (link will display full 1995 Gregorian calendar). ... is the 60th day of the year (61st in leap years) in the Gregorian calendar. ... Year 1995 (MCMXCV) was a common year starting on Sunday (link will display full 1995 Gregorian calendar). ... Year 1996 (MCMXCVI) was a leap year starting on Monday (link will display full 1996 Gregorian calendar). ...

References

• Kushner, David: Masters of Doom: How Two Guys Created an Empire and Transformed Pop Culture, Random House Publishing Group 2003, ISBN 0-375-50524-5; pages 166-169
• Larsen, Henrik: The Unofficial Master Levels for Doom II FAQ, version 1.02 (retrieved October 4, 2004)
• Doomworld: The Top 100 WADs Of All Time (retrieved December 6, 2004)
• 1999 Slashdot interview with John Carmack (retrieved December 9, 2004)
• Interview with Justin Fisher (retrieved December 9, 2004)

is the 277th day of the year (278th in leap years) in the Gregorian calendar. ... Year 2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar. ... December 6 is the 340th day of the year (341st in leap years) in the Gregorian calendar. ... Year 2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar. ... is the 343rd day of the year (344th in leap years) in the Gregorian calendar. ... Year 2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar. ... is the 343rd day of the year (344th in leap years) in the Gregorian calendar. ... Year 2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar. ...

External links

• The largest repository of Doom modifications by far is the "idgames" FTP archive, containing over 10,000 files. The idgames archive is currently hosted by 3dgamers.com and available at ftp://3darchives.in-span.net/pub/idgames/ and many mirrors. Doomworld provides a web-based interface to the idgames archive with search functionality and the ability for visitors to rate WADs.
• World's first original WAD created by Jeff Bird.
• Open Directory Project listings of websites related to modifications and add-ons for Doom:
  • Modifications and add-ons for the Doom series
  • Modifications and add-ons for Doom II
• WADs In Progress
• Doomworld: The Top 100 WADs Of All Time