Commander Keen is a series of side-scrolling platform video games developed primarily by id Software.
 The series consists of six main episodes, a "lost" episode, and a final game; all but the final game were originally released for MS-DOS in 1990 and 1991, while the 2001 "Commander Keen" was released for the Game Boy Color.
 The series follows the titular Commander Keen, the secret identity of the eight-year-old genius Billy Blaze, as he defends the Earth and the galaxy from alien threats with his homemade spaceship, rayguns, and pogo stick.
 The first three episodes were developed by Ideas from the Deep, the precursor to id, and published by Apogee Software as the shareware title "Commander Keen in Invasion of the Vorticons"; the "lost" episode 3.5 "Commander Keen in Keen Dreams" was developed by id and published as a retail title by Softdisk; episodes four and five were released by Apogee as the shareware "Commander Keen in Goodbye, Galaxy"; and the simultaneously developed episode six was published in retail by FormGen as "Commander Keen in Aliens Ate My Babysitter".
 Ten years later, a homage and sequel to the series was developed by David A. Palmer Productions and published by Activision as "Commander Keen".
Quake 4 is a military science fiction first-person shooter video game, the fourth title in the "Quake" series.
 The game was developed by Raven Software and published by Activision.
 Raven Software collaborated with id Software, the creators and developers of preceding "Quake" games.
 id Software supervised the development of the game as well as providing the id Tech 4 engine upon which it was built.
 "Quake 4" went gold in early October 2005 and was released on 18 October 2005 for Microsoft Windows and later for Linux, Xbox 360 and OS X.
 A special DVD Collectors Edition was released, including promotional material and the game "Quake II" with its expansions, "The Reckoning" and "Ground Zero".
 The Xbox 360 version of "Quake 4" is based on the Special Collectors Edition, and includes "Quake II".
 On 4 August 2011 the game was made available through Steam.
Winter Olympics, released in the United States as Winter Olympic Games, is the official video game of the XVII Olympic Winter Games in Lillehammer, Norway.
 All versions were published by U.S. Gold, the rightsholder; home computer versions (Amiga and PC) were developed by ID Software (not to be confused with id Software) and console versions (GG, MD/Gen, Master System, Super NES) were developed by Tiertex.
 The game featured 10 winter sporting events.
 There are also major differences between platforms.
 Players can represent countries from all over the world.
The BFG is a fictional weapon found in many video game titles, mostly in first-person shooter series such as "Doom" and "Quake".
Rogue Entertainment was a computer game developer based in Dallas, Texas, which was active in the late 1990s.
 It was founded by Rich Fleider, Steve Maines, and Jim Molinets in 1994.
 Rogue Entertainment's office was in the same building as id Software, all of their games used game engines created by id Software, and two of their games were expansions for id Software's "Quake" series of games.
 The company's first game, "Strife: Quest for the Sigil", was released as shareware on February 23, 1996, with the retail version later being released on May 31, 1996.
 Many former Rogue Entertainment employees moved to Nerve Software after Rogue Entertainment shut down.
Marty Stratton is an executive producer and game director for Id Software.
 After joining Id Software in 1997, Stratton became the Director of Business Development, overseeing the company's interests in European markets.
 In 2006, he became responsible for the overall development of "Quake Live", "Rage", and "Doom" with ZeniMax Media and Bethesda Softworks respectively.
 Prior to his arrival at Id Software, Stratton previously worked for Adeline Software International and Activision in Quality Assurance on "Time Commando" and "".
Doom (stylized as DOOM) is a series of first-person shooter video games developed by id Software.
 The series focuses on the exploits of an unnamed space marine operating under the auspices of Union Aerospace Corporation (UAC), who fights hordes of demons and the undead in order to survive.
QuakeWorld (abbreviated QW) is an update to id Software's seminal multiplayer deathmatch game, "Quake", that enhances the game's multiplayer features (namely UDP support) to allow people with dial-up modems to achieve greatly improved responsiveness when playing on Internet game servers.
 Modern broadband connections such as cable and DSL can use the QW network handling and game physics as well.
 Official id Software development stopped with the test release of QuakeWorld 2.33 on December 21, 1998.
 The last official stable release was 2.30.
 QuakeWorld has been described by IGN as the first popular online first-person shooter.
Rage (stylized as RAGE) is a first-person shooter video game developed by id Software, released in October 2011.
 It was first shown as a tech demo on June 11, 2007, at the Apple Worldwide Developers Conference, and was officially announced on August 2, 2007 at QuakeCon.
 "Rage" uses id Software's id Tech 5 game engine, and was the final game released by the company under the supervision of founder John Carmack.
id Tech is a series of separate game engines designed and developed by id Software.
 Prior to the presentation of the id Tech 5-based game "Rage", the engines lacked official designation and as such were simply referred to as the "Doom" and "Quake" engines, from the name of the main game series the engines have been developed for.
 "id Tech" numbers 2, 3, and 4 have been released as free software under the GNU General Public License, along with the source code to "Wolfenstein 3D", "Doom", and "Quake".

Question: The weapon BFG is found in which game developed by id Software ?
Answer: Doom