Cover art for the mail order DOS version
Wolfenstein 3D is a first-person shooter video game developed by id Software and published by Apogee Software and FormGen. Originally released on May 5, 1992 for MS-DOS, it was inspired by the 1981 Muse Software video game Castle Wolfenstein, and is the third installment in the Wolfenstein series. In Wolfenstein 3D, the player assumes the role of Allied spy William "B.J." Blazkowicz during World War II as he escapes from the Nazi German prison Castle Wolfenstein and carries out a series of crucial missions against the Nazis. The player traverses each of the game's levels to find an elevator to the next level or kill a final boss, fighting Nazi soldiers, dogs, and other enemies with knives and a variety of guns.
Wolfenstein 3D was the second major release by id Software, after the Commander Keen series of episodes. In mid-1991, programmer John Carmack experimented with making a fast 3D game engine by restricting the gameplay and viewpoint to a single plane, producing Hovertank 3D and Catacomb 3-D as prototypes. After a design session prompted the company to shift from the family-friendly Keen to a more violent theme, programmer John Romero suggested remaking the 1981 stealth shooter Castle Wolfenstein as a fast-paced action game. He and designer Tom Hall designed the game, built on Carmack's engine, to be fast and violent, unlike other computer games on the market at the time. Wolfenstein 3D features artwork by Adrian Carmack and sound effects and music by Bobby Prince. The game was released through Apogee in two sets of three episodes under the shareware model, in which the first episode is released for free to drive interest in paying for the rest. An additional episode, Spear of Destiny, was released as a stand-alone retail title through FormGen.
Wolfenstein 3D was a critical and commercial success, garnering numerous awards and selling over 200,000 copies by the end of 1993. It is widely regarded as having helped popularize the first-person shooter genre and establishing the standard of fast-paced action and technical prowess for many subsequent games in the genre, as well as showcasing the viability of the shareware publishing model at the time. FormGen developed an additional two episodes for the game, while Apogee released a pack of over 800 fan-created levels. Id Software never returned to the series, but did license the engine to numerous other titles before releasing the source code for free in 1995, and multiple other games in the Wolfenstein series have been developed by other companies since 2001.
Wolfenstein 3D is a first-person shooter presented with rudimentary 3D graphics. The game is broken up into levels, each of which is a flat plane divided into areas and rooms by a grid-based pattern of walls and doors, all of equal height. Each level is themed after Nazi bunkers and buildings. To finish a level, the player must traverse through the area to reach an elevator. Levels—ten in the original episodes—are grouped together into named episodes, with the final level focusing on a boss fight with a particularly difficult enemy. While traversing the levels, the player must fight Nazi guards and soldiers, dogs, and other enemies while managing supplies of ammunition and health. The player can find weapons and ammunition placed in the levels or can collect them from dead enemies; weapons include a knife, a pistol, a submachine gun, and a rapid-fire chain gun. While the levels are presented in a 3D perspective, the enemies and objects are instead 2D sprites presented from several set viewing angles, a technique sometimes referred to as 2.5D graphics.
The player's health is represented by a percentage starting at 100, which is diminished when they are shot or attacked by enemies. If the player's health falls to zero, they lose one life and start the level over with a knife, a pistol, and eight bullets. The player begins each episode with three lives and can gain more by finding extra-life tokens or by earning enough points. Points are scored by killing enemies or collecting treasures scattered throughout the levels. Points can also be scored by killing all enemies in a level, collecting all treasure, finding all secret areas, or completing a level under a par time; the player's completion ratio and speed is displayed when a level is completed. Secret areas containing treasure, health refills, or ammunition can be found in hidden rooms revealed by activating certain wall tiles that slide back when triggered. The original version of the game allows the player to save their progress at any point, though in many of its ports the player can only save between levels.
Wolfenstein 3D is divided into two sets of three episodes: "Escape from Castle Wolfenstein", "Operation: Eisenfaust", and "Die, Führer, Die!" serve as the primary trilogy, with a second trilogy titled The Nocturnal Missions including "A Dark Secret", "Trail of the Madman", and "Confrontation". The protagonist is William "B.J." Blazkowicz, an American spy of Polish descent, and the game follows his efforts to destroy the Nazi regime. In "Escape", Blazkowicz has been captured while trying to find the plans for Operation Eisenfaust (Iron Fist) and imprisoned in Castle Wolfenstein, from which he must escape. "Operation: Eisenfaust" follows his discovery and thwarting of the Nazi plan to create an army of undead mutants in Castle Hollehammer, while in "Die, Führer, Die!" he infiltrates a bunker under the Reichstag, culminating in a battle with Adolf Hitler in a robotic suit equipped with four chain guns.
The Nocturnal Missions form a prequel storyline dealing with German plans for chemical warfare. "A Dark Secret" deals with the initial pursuit through a weapons research facility of the scientist responsible for developing the weaponry. "Trail of the Madman" takes place in Castle Erlangen, where Blazkowicz's goal is to find the maps and plans for the chemical war. The story ends in "Confrontation", which is set in Castle Offenbach as he confronts the Nazi general behind the chemical warfare initiative.
An additional episode entitled Spear of Destiny was released as a retail game by FormGen. It follows Blazkowicz on a different prequel mission trying to recapture the Spear of Destiny from the Nazis after it was stolen from Versailles. FormGen later developed two sequel episodes, "Return to Danger" and "Ultimate Challenge", each of which feature Blazkowicz as he fights through another Nazi base to recover the Spear of Destiny after it has been stolen again as part of a plot to build a nuclear weapon or summon demons.
In October–December 1990, a team of employees from programming studio Softdisk calling themselves Ideas from the Deep developed the three-part video game Commander Keen in Invasion of the Vorticons, the first game in the Commander Keen series. The group, who worked at Softdisk in Shreveport, Louisiana developing games for the Gamer's Edge video game subscription service and disk magazine, was composed of programmers John Romero and John Carmack, designer Tom Hall, artist Adrian Carmack, and manager Jay Wilbur. After the release of the game in December through shareware publisher Apogee Software, the team planned to quit Softdisk and start their own company. When their boss, Softdisk owner Al Vekovius, confronted them on both their plans and their use of company resources to develop the game—the team had created it on their work computers, both in the office after hours and by taking the computers to John Carmack's house on the weekends—the team made no secret of their intentions. After a few weeks of negotiation, the team agreed to produce a series of games for Gamer's Edge, one every two months.
Ideas from the Deep, now formally established as id Software, used some of these to prototype ideas for their own games. Adrian Carmack used them to push his preferred, dark art style, while John Carmack began to experiment with 3D computer graphics, which until then was largely the purview of flight simulation games such as Wing Commander (1990). Carmack found that this was largely due to the limitations of personal computers of the time, which had difficulty displaying a fast action game in 3D due to the number of surfaces it needed to calculate, but felt that the increasing computational power of PCs meant that it may be possible. During 1991, he experimented with limiting the possible surfaces the computer needed to display, creating game levels with walls designed only on a flat grid rather than with arbitrary shapes or angles. He also took the unusual approach of creating the displayed graphics through ray casting, in which only the surfaces visible to the player were calculated rather than the entire area surrounding the player. After six weeks of development, Carmack had created a rudimentary 3D game engine that used animated 2D sprites for enemies. Id Software then used the engine for the April 1991 Softdisk game Hovertank 3D, in which the player drives a tank through a plane of colored walls and shoots nuclear monsters. In the fall of 1991, after the team—sans Wilbur—had relocated to Madison, Wisconsin, and he had largely finished the engine work for Commander Keen in Goodbye, Galaxy, Carmack decided to implement a feature from Ultima Underworld: The Stygian Abyss, a role-playing game in development by Blue Sky Productions. Ultima Underworld was planned to display texture-mapped 3D graphics without Hovertank's restrictions of flat walls and simple lighting. Deciding that he could add texture mapping without sacrificing the engine's speed or greatly increasing the system requirements as Underworld was doing, Carmack enhanced the engine over six weeks from Hovertank 3D for another Softdisk game, the November 1991 Catacomb 3-D. Upon seeing it, Scott Miller of Apogee began to push the team to make a 3D shareware action game.
In November 1991, with the second Commander Keen trilogy of episodes nearing completion and their contractual obligations to Softdisk almost finished, id Software sat down to plan out their next major game. Designer Tom Hall, who initially wanted to do a third Keen trilogy, recognized that Carmack's programming focus had shifted from the 2D side-scrolling platform game series to 3D action games. After an initial proposal by Hall of a sci-fi project, "It's Green and Pissed", Romero suggested a 3D remake of the 1981 Castle Wolfenstein. The team was interested in the idea, as Romero, Hall, and John Carmack all had fond memories of the original title and felt the maze-like shooter gameplay fit well with Carmack's 3D game engine, while Adrian Carmack was interested in moving away from the child-friendly art style of Keen into something more violent. Encouraged by the reception to his idea, Romero expounded on it by proposing a "loud" and "cool" fast action game where the player could shoot soldiers before dragging and looting their bodies. The core of the gameplay would be fast and simple, for Romero believed that due to the novelty of a 3D game and control scheme, players would not be receptive to more complicated, slow gameplay. He felt the game would occupy a unique place in the industry, which was then dominated by slower simulation and strategy games. Adrian and John Carmack were excited by the prospect, while Hall felt that it was enjoyable enough, and that since he was the company's designer that they could return to his ideas at a later date.
Initially the team believed that they would be unable to use the Wolfenstein name due to trademark issues, and came up with multiple possible titles. They contacted Castle Wolfenstein developer Silas Warner, but learned that Muse Software and successor companies no longer existed and the trademark had lapsed, leaving them the option to use the name Wolfenstein 3D. The game concept met with immediate approval from Scott Miller of Apogee, who considered id Software his star developer, and he guaranteed id a US$100,000 payment on the project. Mark Rein, who had been brought on a few months prior as id's probationary president, also sold the idea of doing a retail Wolfenstein project to FormGen, which had published id's December 1991 Commander Keen in Aliens Ate My Babysitter, overcoming the publisher's concerns over Wolfenstein's proposed content. This put id in the unique position of selling simultaneously to the shareware and retail markets.
Romero and Hall designed the gameplay and aesthetics; Romero wanted the goal to be "to mow down Nazis", with the suspense of storming a Nazi bunker full of SS soldiers and Hitler himself, as well as dogs, blood "like you never see in games", and straightforward, lethal weapons. Hall designed the levels while also adding collectible objects in the form of treasure and food for health items. Carmack programmed "the core" of the game's engine in a month; he added a few features to the Wolfenstein 3D engine from Catacomb 3-D, including support for doors and decorative non-wall objects, but primarily focused on making the game run smoother and faster with higher-resolution graphics. The graphics for the game were planned to be in 16 color EGA, but were changed to 256 color VGA four months before release. Romero in turn worked on building a game with the engine, removing elements of the initial design, like looting enemy bodies, that he felt interrupted the flow of fast gameplay. Initially they had an external artist who assisted Adrian Carmack with the artwork who created animated wall textures, but the team felt that the quality was poor and did not use it in the game. The level design, by Romero and Hall, due to the grid-based level design, took some inspiration from Pac-Man, and paid homage with a hidden Pac-Man level. The team ensured that the presentation of the game created the atmosphere that they wanted, adding violent animations by Adrian Carmack for enemies being shot and music and sound effects by Keen composer Bobby Prince to make the guns sound exciting. With the aid of a 16-bit sampler keyboard and cassette recorder, Bobby Prince composed realistic sounds from a shooting range in addition to Foley sounds. The development team along with Scott Miller did the voicing for the enemies.
As development continued, id Software hired their former Softdisk liaison Kevin Cloud as an assistant artist, and moved the company out to Mesquite, Texas, near where Apogee was located. Scott Miller of Apogee was pleased to have his star developers nearby, and agreed to not only increase their royalty rate to 50 percent, but have Apogee create their next game for Softdisk, ScubaVenture, so that id could focus on Wolfenstein. The game was intended to be released using Apogee's shareware model of splitting it into three episodes and releasing the first for free, with ten levels per episode. The level maps were designed in 2D using a custom-made program called Tile Editor (TEd), which had been used for the entire Keen series as well as several other games. Upon finding out that the team was able to create a level in a single day using the program, Miller convinced them to instead develop six episodes, which could be sold in different-sized packs. Around the same time, the team changed members and structure: id fired probationary president Mark Rein and brought back Jay Wilbur, who had stayed in Shreveport, to be both their CEO and business team; Bobby Prince moved into the office temporarily to record sound effects, while Adrian Carmack moved out of the office to get away from the noise.
As the game neared completion, FormGen contacted id with concerns over its violence and shock content. In response, id increased these aspects; Adrian Carmack added skeletons, corpses, and bloody wall details, and Hall and Romero added screams and cries in German, along with a Death Cam that would show a replay of the death of the final boss of an episode. The team also added "Horst-Wessel-Lied", the anthem of the Nazi Party, to the opening screen. John Carmack, meanwhile, added in walls that moved when triggered to hide secret areas, a feature that Hall had been pushing for months but which Carmack had objected to for technical reasons. Hall also added in cheat codes, and wrote a back story for the game. In the early morning of May 5, 1992, the first episode of the shareware game was completed and uploaded by Apogee and id to bulletin board systems. The other episodes were completed a few weeks later. The total development time had been around half a year, with a cost of around US$25,000 to cover the team's rent and US$750 per month salaries.
The following summer, most of the id Software team developed Spear of Destiny, except John Carmack, who instead experimented with a new graphics engine that was licensed for Shadowcaster and became the basis of the Doom engine. The one episode of Spear of Destiny was a prequel to Wolfenstein 3D and used the same engine, but added some new audio, graphics, and enemies. It took two months to create, and was published commercially by FormGen in September 1993.
The first episode was released as shareware for free distribution by Apogee and the whole original trilogy of episodes made available for purchase on May 5 as Wolfenstein 3D, though the purchased episodes were not actually shipped to customers until a few weeks later. The second trilogy that Miller had convinced id to create was released soon after as an add-on pack titled The Nocturnal Missions. Players were able to buy each trilogy separately or as a single game. In 1993 Apogee also published the Wolfenstein 3D Super Upgrades pack, which included 815 fan-made levels called "WolfMaster", along with a map editor titled "MapEdit" and a random level generator named "Wolf Creator". A retail Wolfenstein episode double the length of the Apogee episodes, Spear of Destiny, was released through FormGen on September 18, 1992. FormGen later published two mission packs titled "Return to Danger" and "Ultimate Challenge", each the same length as Spear of Destiny, in May 1994, and later that year published Spear of Destiny and the two mission packs together as the Spear of Destiny Super CD Package. Id released the original six Apogee episodes as a retail title through GT Software in 1993 and produced a collection of both the Apogee and FormGen episodes released through Activision in 1998.
There were two intended promotions associated with the original Apogee release, both of which were cancelled. A pushable wall maze led to a sign reading "Call Apogee and say Aardwolf"; it was intended that the first person to find the sign and carry out its instructions would win a prize, but the quick creation of level editors and cheat programs for the game soon after release led id and Apogee to give up on the idea. Additionally, after completing an episode the player is given a three-letter code in addition to their total score and time. This code was intended to be a verification code as part of a high-score contest, but the sudden prevalence of editor programs resulted in the cancellation of the contest without ever being formally announced.
Since its initial release, Wolfenstein 3D has been ported to numerous other platforms. These include the Super Nintendo Entertainment System (1994), Classic Mac OS (1994), Atari Jaguar (1994), Acorn Archimedes (1994), 3DO (1995), and Apple IIGS (1998). The Super NES and Jaguar ports were developed by id, while the rest were produced by other companies. Later releases include the Game Boy Advance (2002), Xbox Live Arcade, PlayStation Network, and an iOS version programmed by Carmack himself (2009). These ports' sound, graphics, and levels sometimes differ from the original—the Super NES version notably replaced the blood with sweat, dogs with rats, and removed all Nazi references, although the core gameplay and aesthetic are retained. Many of the ports include only the Apogee episodes, but the iOS port includes Spear of Destiny, and a 2007 Steam release for PC, macOS, and Linux includes all of the FormGen episodes. Bethesda Softworks, whose parent company bought id Software in 2009, celebrated the 20th anniversary of Wolfenstein 3D's release by producing a free-to-play browser-based version of the game in 2012.
The Super NES port was completed in three weeks in March 1993 during the development of Doom, after the contractor who had agreed to do the port proved to have made no progress. Nintendo insisted on censoring the game in accordance with their policies. The port was initially going to have green blood, but the final version had no blood at all. Using the source code of the Super NES port, on a whim John Carmack later converted the game to run on the Atari Jaguar. Atari Corporation approved the conversion for publication and Carmack spent three weeks, assisted by Dave Taylor, improving the port's graphics and quality to what he later claimed was four times more detail than the DOS version. He also removed the changes that Nintendo had insisted on. The SNES version was ported to Japan and released on February 10, 1994 under the name Wolfenstein 3D: The Claw of Eisenfaust before being ported back to North America and Europe a little later in 1994. The Acorn Archimedes conversion was done in UK by programmer Eddie Edwards and published by Powerslave Software. By 1994, a port for the Sega Megadrive was under development by Imagineer, who intended to release it by September, but it was cancelled due to technical problems. An Atari Lynx version of the game was offered earlier by Atari Corp. for id, but work on the port was never started due to an unrealized deal between the two companies. The 3DO version was released in October 1995 before being ported to Japan for release on December 15, 1995. The Apple IIGS port had been in development since Fall 1994 by programmer Bill Heineman under the Vitesse company, but due to licensing problems, the game was not released until four years later and published by Logicware. The iOS port was done using the OpenGL interface and coded in C. The Android port was titled "Wolfenstein 3D Touch" and published by Beloko Games.
Id had no clear expectations for Wolfenstein's commercial reception, but hoped that it would make around US$60,000 in its first month; the first royalty check from Apogee was instead for US$100,000. PC Zone quoted a shareware distributor as saying Wolfenstein 3D was the top shareware seller of 1992. By the end of 1993, sales of the Apogee episodes of Wolfenstein 3D as well as Spear of Destiny had reached over 100,000 units each, with the Apogee game still selling strongly by the end of the year as its reach spread without newer retail titles to compete with it for shelf space. By mid-1994 150,000 shareware copies were registered and id sold another 150,000 retail copies as Spear of Destiny; the company estimated that one million shareware copies were distributed worldwide. Over 20 percent of its sales were from outside of the US, despite the lack of any marketing or non-English description and despite the game being banned from sale in Germany due to its inclusion of Nazi symbols by the Federal Department for Media Harmful to Young Persons in 1994, and again in 1997 for Spear of Destiny. The Apogee episodes' sales vastly exceeded the shareware game sales record set by the developer's earlier Commander Keen series and provided id with a much higher profit margin than the sales of its retail counterpart; where Commander Keen games were bringing Apogee around $10,000 a month, Wolfenstein 3D brought in $200,000 per month.
Wolfenstein 3D won the 1993 "Best Action/Arcade Game" award at the Shareware Industry Awards and a Codie award from the Software Publishing Association for Best Action/Arcade Game. It was the first shareware title to win a Codie, and id (with six employees) became the smallest company to ever receive the award. Wolfenstein 3D was noted as one of the top games of the year at the 1993 Game Developers Conference, was named by VideoGames & Computer Entertainment as the Best Action Game and Most Innovative Game of 1992 and by Compute! as the Best Arcade/Action Game, and Computer Gaming World named it the magazine's Action Game of the Year in 1993.
Wolfenstein 3D was well received by reviewers upon its release. Chris Lombardi of Computer Gaming World praised the "sparse [but] gorgeous", "frighteningly realistic", and "extremely violent" graphics, as well as the "immersive" sound and music. Noting the violence, he warned "those sensitive to such things to stay home". Lombardi concluded that Wolfenstein 3D, alongside Ultima Underworld released two months prior, was "the first game technologically capable of creating a sufficient element of disbelief–suspension to emotionally immerse the player in a threatening environment", stating that they knew of no other game that could "evoke such intense psychological responses from its players". Wolfenstein twice received 5 out of 5 stars in Dragon in 1993; Hartley, Patricia, and Kirk Lesser termed it "definitely one of the best arcade games ever created for PC", highly praised the graphics and sound, and said that the "fast-paced action" could keep players enthralled for weeks if they were not concerned about the violence. Sandy Petersen, in the first "Eye of the Monitor" column, claimed that "there is nothing else quite like Wolfenstein" and that it had "evolved almost beyond recognition" from the original 1981 game. He enthusiastically praised the speed and gameplay, calling it "a fun game with lots of action" and "a fun, fairly mindless romp", though he did note that at higher difficulty settings or later levels it became extremely hard. The Spear of Destiny retail episode was also rated highly by Computer Gaming World's Bryan A. Walker, who praised the added enemy types, though he noted that it was essentially the same game as the shareware episodes. Formgen's Spear of Destiny mission packs "Return to Danger" and "Ultimate Challenge" were reviewed by Paul Hyman of Computer Gaming World, who praised the updated graphical details and sound, as well as the smooth gameplay, but noted its overall dated graphics and lack of gameplay changes from the original game.
The early ports of the game also received high reviews, though their sales have been described as "dismal". The four reviewers of Electronic Gaming Monthly called the Super NES version a good conversion that retained the good music, huge levels, and overall fun of the original game and dismissed the censoring in the version as inconsequential. The magazine rated the Jaguar version similarly, commenting that the graphics and audio were superior to other versions of the game, but criticizing the faster movement of the player character as making it less fun to play. A GamePro review of the Jaguar port was highly complimentary, saying Wolfenstein 3D "set a new standard for PC gaming" and that the Jaguar version was the best to date, and better than the original due to its increased graphics and sound capabilities. A Next Generation review of the Jaguar version was less enthusiastic, terming it good but not up to the standards of newer games. Its review of the Macintosh version of the game was also mild, stating that "there isn't a staggering amount of freshness here, but the action is fast, deadly, and (surprise) addictive". Major Mike of GamePro commended the 3DO version's complete absence of pixelation, fast scaling, "rousing" music, and high quality sound effects, but criticized the controls as overly sensitive. He concluded that the game, then over three years old, "still packs a punch as a first-person shooter". Wolfenstein 3D won GamePro's Best 3DO Game of 1995 award, beating the acclaimed The Need for Speed and D. Maximum, on the other hand, while stating that the 3DO port was better than the original and as good as the Jaguar version, felt that it was so aged compared to recent releases like Hexen: Beyond Heretic and the PlayStation version of Doom that a new port was pointless, with the game now "somewhat tiresome and very, very repetitive". A reviewer for Next Generation asserted that Wolfenstein 3D was "still as addictive as it ever was" but essentially agreed with Maximum, contending that anyone interested in first-person shooters would have either already played it on another platform or "moved on" to more advanced games in the genre. A more modern review by Daemon Hatfield of IGN gave the PlayStation Network release of the game a warm reception, saying that while it was "dated and flawed", it was "required playing for any first-person shooter fan".
Wolfenstein 3D has been called the "grandfather of 3D shooters", specifically first-person shooters, because it established the fast-paced action and technical prowess commonly expected in the genre and greatly increased the genre's popularity. Although some prior computer shooting-based games existed, they were generally scrolling shooters, while Wolfenstein 3D helped move the market towards first-person shooters. It has also been attributed with confirming shareware distribution as a serious and profitable business strategy at the time; VideoGames & Computer Entertainment claimed in September 1992 that the game "justified the existence of shareware", and in July 1993 Computer Gaming World claimed that it "almost single-handedly" demonstrated the viability of shareware as a method of publishing, leading to a wave of other shareware first-person shooters. The game's high revenue compared to prior, smaller 2D titles led Apogee as well as others in the shareware games industry to move towards larger, 3D titles built by larger development teams. During development, id approached Sierra Entertainment, then one of the biggest companies in the industry and employer of several of their idols, with the goal of seeing if they could make a deal with the company. After viewing Commander Keen and an early version of Wolfenstein 3D, CEO Ken Williams offered to buy id Software for US$2.5 million and turn it into an in-house development studio. The team was excited by the deal, but had felt there was a large culture clash between the two companies during their visit to Sierra and were hesitant to accept; Romero proposed asking for US$100,000 in cash up front as part of the deal rather than solely accepting payment in Sierra stock as a measure of Williams's seriousness. Williams refused, which id interpreted to mean that Williams did not truly recognize the potential of Wolfenstein 3D and the company, and the deal fell through, causing id to decide to remain an independent company for the foreseeable future. By the end of 1993 just before the release of their next game, Doom, the success of Wolfenstein 3D led id to receive multiple calls every month from investment companies looking to make id a publicly-traded company, which were all turned down.
The game is also recognized as the principle cause for Germany banning video games that contain certain types of symbols and imagery from extremist groups like Nazis under its Strafgesetzbuch section 86a up through 2018. Section 86a had "social adequacy" allowances for works of art, but in 1998, a High District Frankfurt Court case evaluating the Nazi imagery within Wolfenstein 3D determined that video games did not fall under this allowance. The court ruled that because video games drew younger audiences, "this could lead to them growing up with these symbols and insignias and thereby becoming used to them, which again could make them more vulnerable for ideological manipulation by national socialist ideas". Up through 2018, the Germany software ratings board, the Unterhaltungssoftware Selbstkontrolle (USK) refused to rate any game that included inappropriate symbols and imagery, effectively banning the game for sale within the country. However, in August 2018, the decision was reversed by the German government, having determined that the Wolfenstein 3D decision was outdated since the USK now included age ratings alongside other content warnings, and that video games should be considered as art under the social adequacy allowance.
After the game's release, id Software licensed the engine to other developers, like the Commander Keen engine before it, as part of a series of engine licensing deals that id has made throughout its history; games using the Wolfenstein 3D engine or derivatives of it include Blake Stone, the Capstone Software games Corridor 7 and Operation Body Count, as well as Super 3D Noah's Ark. Apogee intended to produce an expansion pack in 1993 titled Rise of the Triad: Wolfenstein 3D Part II, designed by Tom Hall using the Wolfenstein 3D engine, but during development the game was changed into a stand-alone title with an enhanced engine, Rise of the Triad. Additionally, Softdisk produced Catacomb Abyss using the prototype Wolfenstein 3D engine from Catacomb 3-D as part of the Catacomb Adventure Series trilogy of sequels. Although Wolfenstein 3D was not designed to be editable or modified, players developed character and level editors to create original alterations to the game's content. John Carmack and Romero, who had played numerous mods of other games, were delighted, and overrode any concerns about copyright issues by the others. The modding efforts of Wolfenstein players led id Software to explicitly design later titles like Doom and Quake to be easily modifiable by players, even including the map editing tools id Software used with the games. The source code for the original Wolfenstein 3D engine was released by id in 1995; when making the 2009 iOS port, Carmack used some of the enhancements to the engine made by fans after its release. The game's technical achievements also led to numerous imitators such as Ken's Labyrinth, Nitemare 3D, The Terminator: Rampage, Terminal Terror and The Fortress of Dr. Radiaki, among others.
Although id Software did not develop another Wolfenstein game, as their development focus shifted to Doom shortly after release, and has never returned to the series, multiple Wolfenstein titles have been produced by other companies, sometimes using game engines developed by id. The first of these newer Wolfenstein games was Return to Castle Wolfenstein in 2001, a reboot of the series, and the latest is the 2017 Wolfenstein II: The New Colossus.
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