List of commercial video games with available source code

For open source video games, see List of open-source video games. For commercial games which were released as freeware without source code, see List of commercial video games released as freeware.

This is a list of commercial video games with available source code. The source code of these commercially developed and distributed video games is available to the public or the games' communities.

In several of the cases listed here, the game's developers released the source code expressly to prevent their work from becoming lost. Such source code is often released under varying (free and non-free, commercial and non-commercial) software licenses to the games' communities or the public; artwork and data are often released under a different license than the source code, as the copyright situation is different or more complicated. The source code may be pushed by the developers to public repositories (e.g. SourceForge or GitHub), or given to selected game community members, or sold with the game, or become available by other means. The game may be written in an interpreted language such as BASIC or Python, and distributed as raw source code without being compiled; early software was often distributed in text form, as in the book BASIC Computer Games. In some cases when a game's source code is not available by other means, the game's community "reconstructs" source code from compiled binary files through time-demanding reverse engineering techniques.

Games with source code available on release

Title	First release	Genre	Engine license	Content license	Original developer	Additional information
Akalabeth: World of Doom	1979	Role-playing video game	Public domain software	Freeware	Richard Garriott	Richard Garriott distributed the Applesoft BASIC written game originally as source code. Also later Origin Systems offered the source code on their FTP servers.
Barkley 2	2021 (cancelled)	ARPG	Proprietary/CC BY-NC 4.0 (engine/game code)	CC BY-NC 4.0	Tales of Game's Studios	Source code released to the public under no license on 11 June 2021, upon the cancellation of the game.
Barotrauma	2017	Role-playing video game	restrictive (only mods)	Proprietary	Undertow Games / Joonas "Regalis" Rikkonen	The game was released in 2017 commercially on Steam by independent developer Undertow Games (Joonas "Regalis" Rikkonen). Source code was released on 4 June 2017 on GitHub under a restrictive mods allowing license. His previous game, SCP – Containment Breach, is also available as free and open-source software under CC BY-SA license.
Beneath a Steel Sky Remastered	2009	Adventure game	GPLv2+	Proprietary	Revolution Software	Source code released under the GPL.
Bomb Alley	1983	Turn-based strategy	Proprietary	Proprietary	Strategic Simulations / Gary Grigsby	The game used the same engine used by Grigsby's previous Guadalcanal Campaign, which was coded and distributed as uncompiled Applesoft BASIC.
Diamond Trust of London	2012	TBS	Public domain software	Public domain	Jason Rohrer	Following a Kickstarter crowdfunding campaign Diamond Trust of London was developed by Jason Rohrer and published by indiePub. On August 28, 2012, it was released for the Nintendo DS. The game has been placed in the public domain, hosted on SourceForge, like most of Rohrer's games.
DONKEY.BAS	1981	Racing game	Proprietary	Proprietary	Bill Gates, Neil Konzen	Was written by Microsoft co-founder Bill Gates and Neil Konzen in 1981 and was included with early versions of the PC DOS operating system for the original IBM PC. Similar early BASIC games which were distributed as source code are GORILLA.BAS and NIBBLES.BAS.
Doom Classic	2009	First-person shooter	GPLv2+	Proprietary	id Software	Source code of the iOS port released in November 2009 as it is based on the PrBoom source port.
ELIZA (DOCTOR)	1966	Chatbot / Rogerian psychotherapist simulator	Public domain software / CC0	Public domain	Joseph Weizenbaum	ELIZA is an influential video game predecessor written at the MIT Artificial Intelligence Laboratory by Joseph Weizenbaum between 1964 and 1966. Weizenbaum's original MAD-SLIP implementation was re-written in Lisp by Bernie Cosell. A BASIC version appeared in Creative Computing in 1977, written in 1973 by Jeff Shrager. This version, which was ported to many of the earliest personal computers, appears to have been subsequently translated into many other versions in many other languages. On May 28, 2021, the original MAD-Slip source code for ELIZA was discovered and released under the CC0 free-software license with permission of Weizenbaum's estate.
Frogatto & Friends	2010	Platform	Zlib license / CC-BY 3.0	Proprietary	Lost Pixel	The game was developed open-source on GitHub with an own open-source game engine by several The Battle for Wesnoth developers and released in July 2010 for several platforms. The game was for purchase on the MacOS' app store, iPhone App Store and BlackBerry App World as the game assets were kept proprietary.
HyperRogue	2011	Roguelike	GPLv2+	Proprietary	Zeno Rogue	Released in 2011 on GitHub as open-source non-Euclidean roguelike, it was commercialized in 2015 on Steam and other distributors.
Ion Fury	2019	First-person shooter	GNU General Public License	Proprietary	Voidpoint	Ion Fury is based on the EDuke32 source port of Duke Nukem 3D, which is under the GNU General Public License. It is possible to compile Ion Fury by downloading the latest version of EDuke32 and compile it with the flag FURY set to 1.
Jagged Alliance 2 Wildfire (now JA2-Stracciatella)	2004	Tactical role-playing game	Own license	Proprietary	iDeal Games	Source code was bundled and released with JA2: Wildfire 2004. The JA: Unfinished Business source code became later available too.
Limit Theory	2018 (canceled)/2022	Real-time strategy	Unlicense	Unlicense	Procedural Reality	Source code released to the public due to the cancelation of the title.
One Hour One Life	2018	Multiplayer survival game	Public domain software	Public domain	Jason Rohrer	Released February 2018 and exclusively sold via the developer's webpage. Like the games before, public domain software and hosted on GitHub.
Pitman	1985	Puzzle game	Proprietary	Proprietary	Yutaka Isokawa	Originally created in 1985 on a MZ-700 home computer by Yutaka Isokawa. The BASIC listing was published in the August 1985 issue of the magazine "Oh!MZ Publications". In 1990 the game was commercially converted for the Game Boy. In 2011, the game community restored a faithful as possible version from the available variants.
Pixel Dungeon	2014	roguelike	GPLv3+	Freeware/Commercial	watabou	Available commercially on Steam, while the Android release source code and original itch.io release are available for free.
Receiver	2012	FPS / stealth game	own non-commercial conditions	Proprietary	Wolfire games	The source code of the game is available since 2012 on GitHub under non-commercial conditions.
Santa Paravia en Fiumaccio	1978	turn-based strategy	Public domain software	Public domain	George Blank	The game by George Blank first appeared in the December 1978 issue of SoftSide magazine as BASIC listing. It was published for sale on tape cassette as a computer game by Instant Software for the Radio Shack TRS-80, the Apple II, TI-99/4A, and PET. It has been translated into many programming languages, such as ANSI C, and has been ported to the Palm Pilot.
Softporn Adventure	1981	Text adventure	Proprietary	Freeware	Chuck Benton / On-Line Systems	A comedic, adult-oriented text adventure game produced for the Apple II in 1981. Softporn Adventure was originally written and released for the Apple II as Applesoft BASIC source code in 1981 by programmer Chuck Benton. The game was released by On-Line Systems and became later the base for Leisure Suit Larry 1. The PC version was also released later as freeware by Al Lowe.
Strife: Veteran Edition (Strife remaster)	2014	FPS	GPLv2+	Proprietary	Samuel Villarreal / Night Dive Studios	In December 2014, Night Dive Studios coordinated the re-release of the 1996 first-person shooter role playing hybrid game Strife as Strife: Veteran Edition, after acquiring rights to the game. Because the game's source code had been lost, a derivative of the Chocolate Doom subproject Chocolate Strife was used as the game's engine, with its original programmers being contracted to do additional coding for the re-release. The source code of Strife: Veteran Edition has been made available under GPLv3 on GitHub by Samuel Villarreal and Night Dive Studios on December 12, 2014. While this was the first source code opened for a Night Dive Studios Studio's game, it was announced more will follow, for instance for System Shock 1.
Quadrilateral Cowboy	2016	Puzzle video game	GPLv3+	Proprietary	Blendo Games	Game source released on August 8, 2016, as it is based on the iodoom3 source port.
Telengard	1982	Dungeon crawler, role-playing, roguelike	Proprietary	Proprietary	Avalon Hill / Daniel Lawrence	As the game's BASIC source code ("DSKTEL.BAS") was available early on, ports and remaster exist therefore by the community.
The Castle Doctrine	2014	MMO	Public domain software	Public domain	Jason Rohrer	The Castle Doctrine is developed by Jason Rohrer in a public SourceForge repository and is like most of his creative works in the public domain. The Castle Doctrine was developed as an early access game and is now sold on Steam.
The Oregon Trail	1975	Role-playing video game	Public domain (?)	Public domain (?)	Don Rawitsch / MECC	First publicly released in 1975 in BASIC, as was the updated 1978 version which was more widely published in Creative Computing, May/June 1978. Source rediscovered in 2011.
The Prisoner	1980	adventure game	Proprietary	Proprietary	Edu-Ware / David Mullich	Developed in BASIC for the Apple II the source code was available with the release. Source code is hosted on GitHub.
Thirty Flights of Loving	2012	Adventure game	GPLv2+	Proprietary	Blendo Games	Game source released in August 2012 as it is based on the KMQuake II source port.
Vulture for Nethack	1987	rogue-like	NetHack General Public License	Freeware / Commercial	NetHack community / Jaakko Peltonen / Clive Crous	Falcon's Eye was developed by Jaakko Peltonen as graphical version of NetHack. After 2001 development had ended, Clive Crous continued Falcon's Eye as Vulture's Eye. While still being Free and open-source software the game is commercialized via the author's website and Desura. In October 2013 the game was put into the Steam Greenlight process and successfully released on Steam in January 2016.
Wargroove	2019	Turn-based tactics	Apache-2.0	Proprietary	Chucklefish	Halley, the custom engine made for Wargroove, has been available on GitHub to the public at least since 2018.
Wolfenstein 3D Classic Platinum	2009	First-person shooter	GPLv2+	Proprietary	id Software	Source code of the iOS port released in March 2009 as it is based on the Wolfenstein 3-D Redux source port.
Wrath: Aeon of Ruin	2019 (early access)	First-person shooter	GPLv2+	Proprietary	KillPixel	Being released in November 2019 as early access game, based on the DarkPlaces engine, the game's source code was also released on GitHub.

Games with available source code

The table below with available source code resulted not from official releases by companies or IP holders but from unclear release situations, like lost and found games, and leaks of unclear legality (e.g. by an individual developer on end-of-product-life) or undeleted content.

Title	Original release	Source code found or leaked	System	Genre	Original developer	Additional information
360: Three Sixty	1999	2020	PlayStation	Racing	Smart Dog	The PlayStation source code can be found in a dummy file on the disc.
Actua Soccer 96	1996	1996	DOS	Sports	Gremlin Interactive	A demo CD that shipped with a game magazine accidentally contained the C++ source code of the game.
Adventure in Time	1981	2016	Atari 8-bit/Apple II	Adventure game	Phoenix Software	In November 2016 the source code for the Atari 8-bit and Apple II versions of Adventure in Time and Birth of the Phoenix were released by Kevin Savetz, along with partial code of The Queen of Phobos for Apple II.
Age of Pirates: Captain Blood	2010	2022	Windows	Action-adventure game/Hack and slash	1C: Seawolf Studio	Source code of game engine was released on GitHub under GPLv3 on November 28, 2022.
Age of Pirates 2: City of Abandoned Ships	2009	2021	Windows	Role-playing game	Akella	Source code of Storm Engine released on GitHub under GPLv3 in a 2021 and support Sea Dogs: To Each His Own and Age of Pirates 2: City of Abandoned Ships.
Airforce Delta	2000	2020	Game Boy Color	Flight simulator	Climax Studios	Source code of the Game Boy Color version was leaked on 4chan in May 2020.
Aliens versus Predator 2	2001	2002	Windows	FPS	Monolith Productions	Source code released on the Monolith Productions FTP server in 2002, then quickly taken down.
Area 51	2005	2024	PlayStation 2, Xbox	FPS	Midway Studios Austin	Final source code for the game was leaked on GitHub by Andrew Sampson on March 7, 2024.
Asteroids	1979	1996	Atari 7800	Arcade	Atari	Source code of Asteroids in the Atari 7800 version was released in physical form by Atari Sunnyvale on their closure 1996. Together with Ms. Pac-Man, Dig Dug, Robotron: 2084 and eight further games reconstructed by the Atari-Museum and published later. Ports for modern FPGAs were made later.
Army Men	1998	2022	Windows	Real-time tactics	The 3DO Company	Source code for the Windows version was uploaded to archive.org in 2022.
Art of Fighting	1992	2014	Neo Geo	Fighting game	SNK	The source code was found on an NEC PC-9821 used for developing Neo Geo titles in 2014.
Aztec	1982	2019	Atari 8-bit	Action-adventure	Datamost	In January 2019 Jason Scott uploaded the source code of this game to the Internet Archive.
Battle Konchuuden	1999	2019	PlayStation	Role-playing game	Jaleco Entertainment	A zip file was found within the retail games dummy data, which included the full PlayStation source code to the game.
Beatmania 5th Mix	1999	2000	PlayStation	Music video game	Konami	With the 2000 Japanese PSX game Beatmania Best Hits there was mistakenly included the source code for the 1999 game Beatmania 5th Mix.
The Bilestoad	1982	2019	Apple II	Action-adventure	Datamost	In January 2019 Jason Scott uploaded the source code of this game to the Internet Archive.
The Black Cauldron	1985	2022	DOS	Adventure	Sierra Entertainment	During October 25–27, 2022, Jason Scott uploaded to GitHub 13 repositories containing source code for a variety of video games.
Blood	1997	2000–2010, 2023	DOS	FPS	QStudios / Monolith Productions	In 2000, partial source code of an alpha version was leaked. In 2010, the complete alpha source code was leaked. Using the code as reference, a reverse engineered build of the final version was created by Alexander Makarov for source ports around 2017. A later alpha draft from July 1996 was leaked in January 2023 by "x0r_jmp".
Blood & Magic	1996	2021	DOS	Real-time strategy	Tachyon Studios	Source code was uploaded to archive.org in 2021.
B.O.B. / Space Funky B.O.B.	1993	2008	SNES	Side-scrolling game	Electronic Arts	On September 12, 2008, the source code of the SNES version became available as it was found on an eBay-bought hard drive.
Buck Rogers: Planet of Zoom	1983	2018	Atari 8-bit	Rail shooter	Sega	On May 17, 2018, Kevin Savetz uploaded scans of the complete source code of the Atari 8-bit conversion of Buck Rogers: Planet of Zoom donated by Charlie Kulas.
California Watersports	2001	2020	PlayStation	Sports	Theyer GFX	The PlayStation source code was released in 2020 with the permission of developer Mark Theyer.
Captain Comic	1988	2012	NES	Platformer	Michael Denio	In September 2012 the source code of the NES version was offered on eBay.
Chicken Run	2000	2011, 2024	Dreamcast, Game Boy Color	Stealth game	Blitz Games	In May 2011, the Sega Dreamcast source code became available, found by a collector on a Dreamcast Dev Kit's harddrive. On 14 January 2024, the Game Boy Color source code was released on archive.org.
Chill	1998	2020	PlayStation	sports game	Silicon Dreams	A zip file was found within the retail game's dummy data, which included the full PlayStation 1 source code to the game.
Columns	1990	2010	Game Gear	Puzzle game	Sega	Game Gear version source code was found in 2006 and released in 2010.
Counter-Strike: Global Offensive	2012	2020	Windows	first-person shooter	Valve	A 2017 version of the game's source code was leaked on 4chan in 2020.
Cruis'n USA	1994	2021	Arcade	Racing game	Midway Games	Uploaded by Jason Scott to GitHub on April 6, 2021.
Cybermorph	1993	2014	Atari Jaguar	Graphic adventure	Attention to Detail	Source released in 2014 on atariage.com.
Cyberpunk 2077	2020	2021	Windows	Role-playing game	CD Projekt Red	Source code obtained in a 2021 ransomware attack against CD, and later leaked online.
Dark Chambers	1988	2008	Atari 2600	Dungeon crawl	Atari Corporation	The source code for the Atari 2600 version of Dark Chambers was uploaded to AtariAge by Curt Vendel on February 9, 2008.
Dark Engine (Thief, Thief II, System Shock 2)	1998	2009–2010	DOS	Stealth game	Looking Glass Studios	In 2009, a complete copy of the Dark Engine source code was discovered in the possession of an ex-Looking Glass Studios employee who was at the time continuing his work for Eidos Interactive. In late April 2010, a user on the Dreamcast Talk forum disassembled the contents of a Dreamcast development kit he had purchased. Later, significant updates for the Dark Engine-based games were published.
Dark Reign 2	2000	2011	Windows	RTS	Pandemic Studios	Released by a former developer of Pandemic Studios under LGPL. Legal status unclear.
Defender	1981	2021	Arcade	Scrolling shooter	Williams Electronics	On 7 January 2021, Jason Scott uploaded to GitHub the source code for the original arcade version of Defender.
Desert Falcon	1987	2008	Atari 2600	Scrolling shooter	General Computer Corporation	The source code for the Atari 2600 version of Desert Falcon was uploaded to AtariAge by Curt Vendel on 9 February 2008.
Devil May Cry 2	2003	2020	Various	Hack and slash	Capcom	Source code was obtained in a 2020 ransomware attack against Capcom.
Donald Duck's Playground	1986	2022	DOS	Adventure	Sierra Entertainment	During October 25–27, 2022, Jason Scott uploaded to GitHub 13 repositories containing source code for a variety of video games.
Donkey Kong	1981	2008	Atari 8-bit	Platform	Nintendo	In August 2008 the 6502 assembly language source code of Donkey Kong was published at the AtariAge forum by Curt Vendel, and was discussed there by the original developer, Landon Dyer.
Doom	1993	2023, 2024	Macintosh, DOS	First-person shooter	id Software	Doom's Macintosh and DOS source code appeared on eBay in two different lots, and once purchased later found its contents online: the first on September 19, 2023 and the second on March 19, 2024.
Doom	1993	2024	SNES	First-person shooter	id Software	Amiga floppy disks containing the SNES source code were released on archive.org on June 5th, 2024.
Double Dragon II: The Revenge	1989	2013	DOS	Beat em up	Technōs Japan	In 2013 the Internet Archive put the undeleted assembly sources (DRGNSRC.LZH) of the DOS version for download.
Dragon Rage	2001	2001	PlayStation 2	Shooter	The 3DO Company	Source code hidden inside a dummy file in the PlayStation 2 version of Jonny Moseley Mad Trix.
Duke Nukem Forever (alpha version only)	2001	2022	Windows	First-person shooter	3D Realms	Source code to an alpha version of the game, dated October 26, 2001, was leaked on May 10, 2022
Empire	1977	197?	FORTRAN/PDP-10	turn-based wargame	Walter Bright	At some point, someone broke through the security systems at Caltech, and took a copy of the source code for the FORTRAN/PDP-10 version of the game. This code was continually modified, being passed around from person to person and ported to other system e.g. to VAX/VMS OS.
Eve Online	2003	2011	Windows	Space strategy MMO	CCP Games	On 20 May 2011, someone released the EVE Online source code on a GitHub repository. After the source code was online four days, CCP issued a DMCA take-down request which was followed by GitHub.
Extreme-G 3	2001	2015	PlayStation 2	Racing game	Acclaim Cheltenham	The source code came into hands of a community member by unknown means around 2015.
Eye of the Beholder II: The Legend of Darkmoon	1991	2021	DOS	Role-playing game	Westwood Associates	The source code was released on archive.org in 2021.
Falcon 4.0	1998	2000	Windows	Combat flight simulator	MicroProse	A 2000 source code leak by a former developer allowed unofficial community development, including upgrades, improved graphics, and bug fixes. In 2013 the source code of one of the community development branches was released to a GitHub repository under a questionable BSD license.
Fall Guys: Ultimate Knockout	2020	2021	Windows	Battle royale game	Mediatonic	Intermediate C++ source code (transpiled from C# with Unity's IL2CPP compiler) accidentally included with a 2021 update.
Fate	2005	2015	Windows	Action RPG	WildTangent	Inadvertently made available when Fate and its sequel Fate: Undiscovered Realms were offered through a May 2015 Humble Bundle. The download link provided to purchasers for the DRM-Free copy lead to an apparently current dump of the source code. This was available for several days before it was corrected.
Far Cry	2004	2023	Various	First-person shooter	Crytek	The source code was released on archive.org in 2023.
The F.A. Premier League Stars	2000	2016	Windows	Sports	Electronic Arts	Source code found in a Windows prototype build.
FIFA 97	1996	1996	Windows	Sports	Electronic Arts	Around 1996 Electronic Arts accidentally put the game's source code on a demo disc.
Forsaken	1998	2007	Windows	6DOF shooter	Probe Entertainment	In 2007, nine years after the first release, the source code became available to the public. The game's community took up the game and kept updating and porting the game via a GitHub repository under a GPL license.
Friday the 13th: The Game	2017	2021	Various	Survival horror	IIIFonic, Black Tower Studios	Partial Unreal Engine project leaked via Google Drive on 2 December 2021.
Frogger (1997)	1997	2023	PlayStation, Windows	Action	SCE Studio Cambridge	PlayStation and Windows source code leaked on 4chan on 27 September 2023.
Frogger (Game.com)	1999	2011	Game.com	Action	Hasbro Interactive	Source code included with Game.com official emulator.
Gears of War	2006	Unknown	Xbox 360 Windows	Third-person shooter	Epic Games	While the exact date and source of the leak isn't commonly known, There are two versions of leaked source code for gears of war 1, both of which contain a playable build while only one contains uncompiled map sources in addition to the build and source code. The first version is just a 2006 English build with xbox 360 controller icons in-place of pc one's. And the other version is a 2007 Chinese localized build with regular pc mouse and keyboard icons.
Glover	1999	2024	PlayStation	Platformer	Blitz Games	On 14 January 2024, the PlayStation source code and numerous builds were uploaded by Codebound to the Internet Archive.
Grand Theft Auto V	2013	2023	Windows	Action-adventure	Rockstar North	Source code obtained as part of the September 2022 Grand Theft Auto VI leaks. Released publicly on 25 December 2023, as a form of protest against the sentencing of the perpetrator of the leaks.
GunZ: The Duel	2005	2011	Windows	Third-person shooter	MAIET Entertainment	In 2011 the source code of GunZ 1.5 became available online.
Gwent: The Witcher Card Game	2018	2021	Windows	Collectible card game	CD Projekt Red	Source code obtained in a 2021 ransomware attack against CD Projekt Red, and was leaked to 4chan on 9 February 2021.
Hägar the Horrible	1992	2021	Commodore 64	Platform	Kingsoft	Source code for the Commodore 64 version was uploaded to archive.org in 2021.
Half-Life 2	2004	2003	Windows	FPS	Valve	An alpha version of Half-Life 2's source code was leaked in 2003, a year before the game's release. A complete snapshot of the game from 2017 also became public in the 2020 Source Engine leak.
Halo Wars	2009	2021	Xbox 360	RTS	Ensemble Studios	Source code for a prototype version dated 3 months before the games release was leaked in 2021.
Hard Drivin'	1989	2024	Atari ST	Sim racing	Tengen	On January 25, 2024, the source code for the Atari ST conversion of Hard Drivin', the Sega Genesis conversion of RoadBlasters and the Sega Genesis version of R.B.I. Baseball '94 was uploaded to the Internet Archive.
Harry Potter and the Chamber of Secrets	2002	2020	Windows	Action-adventure	KnowWonder	Source code from a prototype version was leaked in 2020.
Heavenly Sword	2007	2016	PlayStation 3	Action-adventure	Ninja Theory	Source code was posted online in 2016, and later partially reuploaded to GitHub in 2019.
Hexen: Beyond Heretic	1995	2024	DOS	First-person shooter	id Software	On a CD-ROM containing Doom's Macintosh source code that appeared on eBay was also some of the original DOS source code for Hexen. Once purchased, it later found its contents online on March 19, 2024.
Hexen: Beyond Heretic	1995	2024	Macintosh	First-person shooter	id Software	A CD-ROM containing Hexen's Macintosh source code was sold on ebay on Oct 6, 2024. Its contents have not yet been found online.
Home Alone 2: Lost in New York	1992	2016	NES	Action game	Imagineering	Game source released of the NES game in 2016 by Frank Cifaldi after finding it on an old hard drive.
Hulk	2003	2021	Various	Action	Radical Entertainment	Source code released on 4chan on 22 August 2021.
Jimmy Neutron vs. Jimmy Negatron	2002	2022	Game Boy Advance	Action	Human Soft	Source code, artwork and builds from the Game Boy Advance version were anonymously leaked on 4chan on 8 November 2022. Among these are various character models and assets used in the production of the film Jimmy Neutron: Boy Genius.
Joust	1982	2021	Arcade	Action game	Williams Electronics	On 7 January 2021, Jason Scott uploaded to GitHub the source code for the original arcade version of Joust.
Kelly Slater's Pro Surfer	2002	2021	PlayStation 2	Sports game	Treyarch	Source code found in a ZIP file in a prototype version of the PlayStation 2 version.
Killer7	2005	2016	GameCube	Action-adventure game	Grasshopper Manufacture	Sources and assets from the GameCube game were found in October 2016 on an open webserver.
King's Quest III			DOS	Adventure	Sierra Entertainment	During October 25–27, 2022, Jason Scott uploaded to GitHub 13 repositories containing source code for a variety of video games.
Lethal Enforcers I & II	1997	1997	PlayStation	Rail shooter	Konami	Source code hidden inside a dummy file.
Leisure Suit Larry in the Land of the Lounge Lizards	1987	2022	DOS	Adventure	Sierra Entertainment	During October 25–27, 2022, Jason Scott uploaded to GitHub 13 repositories containing source code for a variety of video games. Both the original and the VGA remake were included.
Leisure Suit Larry Goes Looking for Love (in Several Wrong Places)	1988	2022	DOS	Adventure	Sierra Entertainment	During October 25–27, 2022, Jason Scott uploaded to GitHub 13 repositories containing source code for a variety of video games. Both the original and the VGA remake were included.
Leisure Suit Larry III: Passionate Patti in Pursuit of the Pulsating Pectorals	1989	2022	DOS	Adventure	Sierra Entertainment	During October 25–27, 2022, Jason Scott uploaded to GitHub 13 repositories containing source code for a variety of video games.
Leisure Suit Larry 5: Passionate Patti Does a Little Undercover Work	1991	2022	DOS	Adventure	Sierra Entertainment	During October 25–27, 2022, Jason Scott uploaded to GitHub 13 repositories containing source code for a variety of video games.
Lineage II	2003	2003	Windows	MMORPG	NCSOFT	In 2003 a Chinese Hacker acquired the Lineage II source code, and sold it to someone who set up alternative servers. Shutdown by FBI in 2007.
Mad Planets	1983	2021	Arcade	Multidirectional shooter	Gottlieb	Uploaded to the Internet Archive by Jason Scott on 20 May 2021.
Manic Miner	2002	2022	Game Boy Advance	Platformer	Jester Interactive	Released on 20 February 2022, by Forest of Illusion.
Metal Arms: Glitch in the System	2003	2019	GameCube	Third-person shooter	Sierra Entertainment	Uploaded to archive.org in 2019.
Metin 2	2004	?	Windows	MMORPG	Ymir Entertainment	The source of the leak is unknown for certain, it is said that an ex employee at Ymir Entertainment leaked the source code for revenge after he was fired.
Microsoft Entertainment Pack	1996	2004	Windows	Casual game	Microsoft	In the copies of Windows NT 4.0 and Windows 2000 source code which leaked back in 2004, there are 32-bit versions of Cruel, Golf, Pegged, Reversi, Snake (Rattler Race), Taipei and TicTactics.
The Misadventures of Tron Bonne	1999	2020	PlayStation	Action-adventure	Capcom	Source code was obtained in a 2020 ransomware attack against Capcom.
MoHo	2000	2022	Dreamcast	Action	Lost Toys	Source code to the Dreamcast version was found and released in 2022.
Monopoly	2000	2018	Windows	Board	Artech Studios	The source code for the Microsoft Windows version of the 2000 video game Monopoly was leaked in August 2018.
Mortal Kombat II	1993	2022	Arcade	Fighting	Midway Games	During October 25–27, 2022, Jason Scott uploaded to GitHub 13 repositories containing source code for a variety of video games, including the arcade version of Mortal Kombat II.
Mortal Kombat 3	1994	2023	Arcade	Fighting	Midway Games	In December 2023, Jason Scott uploaded the arcade source of Mortal Kombat 3.
Mortal Kombat Trilogy	1996	2018	Various	Fighting	Midway Games	Game source code for the Nintendo 64 version was leaked anonymously on 4chan, alongside the Windows, PS1, and Arcade source of Mortal Kombat 3.
Monsters, Inc.	2001	2019	PlayStation 2	Platform	Kodiak Interactive	Source code and artwork for the PlayStation 2 version was uploaded to archive.org in 2019.
Mr Nutz 2	1994	2008	Amiga	Platformer	Ocean Software	Amiga game, source code prototype associated with Peter Thierolf.
Mr. Robot and His Robot Factory	1983	2019	Apple II	Platform	Datamost	In January 2019 Jason Scott uploaded the source code of this game to the Internet Archive.
The Muppets on the Go!	1996	2017	Sega Pico	Educational	Climax Studios	Source code found on a backup disc, among art assets and more.
Myst	1995	2014	Atari Jaguar	Graphic adventure	Cyan Worlds	Source released in 2014 on atariage.com.
Narc	1988	2021	Arcade	Run and gun	Williams Electronics	Uploaded by Jason Scott to GitHub on April 6, 2021.
NBA Jam	1993	2021	Arcade	Sports video game	Midway Games	On April 6 2021, Jason Scott uploaded to GitHub the source code for the original arcade version of NBA Jam and NBA Jam: Tournament Edition.
NBA Jam Extreme	1996	2017	Various	Sports game	Sculptured Software	In February 2017 the source code was discovered on an archival CD liquidated by Acclaim Entertainment during their bankruptcy sale. It was subsequently sold on eBay for $500.
NBA Jam 2001	2000	2023	Game Boy Color	Sports game	DC Studios	On November 7, 2023, the source code and numerous builds were uploaded by Codebound to the Internet Archive.
NBA Hangtime	1996	2021	Arcade	Sports game	Midway Games	Uploaded by Jason Scott to GitHub on April 6, 2021.
NFL Blitz 2000	1999	2023	Arcade	Sports game	Midway Games	During October 18–19, 2023, Jason Scott uploaded to GitHub 7 repositories containing source code for a variety of video games and in-house development utilities, including the arcade version of NFL Blitz 2000 and San Francisco Rush: The Rock.
NHL Hockey	1991	2024	Genesis	Sports game	Park Place Productions	On February 16, 2024, the source code was uploaded by Codebound to the Internet Archive.
NHL Open Ice	1996	2021	Arcade	Sports game	Midway Games	Uploaded by Jason Scott to GitHub on April 6, 2021.
Nickelodeon Party Blast	2002	2020	Various	Party game	Data Design Interactive	Found a developer's HDD in September 2020, along with many other Data Design Interactive games.
Ninety-Nine Nights	2006	2021	Xbox 360	Hack and Slash	Q Entertainment	Source code from an unknown point of development was leaked in 2021, later uploaded to archive.org.
Ninja Hattori-kun	1986	2019	Famicom	Platformer	Hudson Soft	Uploaded to GitHub on December 24, 2019.
Various Nintendo games	1990-2017	2020-2021	Various	Various	Various	Throughout 2020, the source code for several games by Nintendo (as well as console firmware) was leaked by anonymous users on 4chan. These include the first four (and seventh) generations of the Pokémon series and the firmware for the Nintendo 64, GameCube, and 3DS. In 2024, Game Freak was breached for more Pokemon games. See Nintendo data leak for more information.
Oni	2001	2021	Various	Third-person shooter	Bungie	On April 29, 2021, an unknown source uploaded the source code to the Internet Archive.
Outlaw Golf	2002	2021	Various	Golf	Hypnotix	On January 2, 2021, Forest of Illusion uploaded a .zip file recovered from a hard drive of Data Design Interactive containing the entire source code for the Windows, Xbox and GameCube versions of the game.
Pac-Man	1982	2019	Atari 8-bit	Maze	Roklan Corp.	In August 2019 the source code for the Atari 8-bit version was released by Kevin Savetz.
Pachinko Dream	1996	1996	PlayStation	Pachinko	Konami	Source code found inside a dummy file.
Pesterminator: The Western Exterminator	1990	2019	NES	side-scrolling	Color Dreams	In November 2019 the NES source code was uploaded to the Internet Archive.
Pinball Fantasies	1994	2020	DOS	Pinball	FrontLine Design	On 20 December 2020, Jason Scott uploaded to GitHub the source code for the DOS port of Pinball Fantasies.
Pocket Music	2002	2022	Game Boy Color	Music	Jester Interactive	Released on 23 February 2022, by Forest of Illusion.
Pole Position	1983	2009	Atari 2600	Racing	General Computer Corporation	On 20 May 2009, Curt Vendel released the source code of the Atari 2600 conversion of Pole Position.
Police Quest: In Pursuit of the Death Angel	1987	2022	DOS	Adventure	Sierra Entertainment	During October 25–27, 2022, Jason Scott uploaded to GitHub 13 repositories containing source code for a variety of video games.
Postal III	2011	2020	Windows	First-person shooter	Running with Scissors	Leaked onto 4chan in June 2020, and contains pre-release Half-Life 2 and Team Fortress 2 content.
Ragnarok Online 2	2007	2014	Windows	MMORPG	Gravity	Posted on a forum found through unknown means.
Raid 2020	1989	2019	Atari 2600	Side-scrolling action game	Color Dreams	Source code was found on a floppy disk and uploaded to archive.org in 2019.
Rat Attack!	1998	2024	PlayStation	Puzzle	Pure Entertainment	PlayStation source code obtained from a developer.
Rayman Raving Rabbids (prototype only)	2006	2022	Windows	Party game	Ubisoft	Source code of an alpha platformer build of Rayman Raving Rabbids was obtained through unknown means and released on December 12, 2022. It also contains the tools and the source code from Ubisoft's Jade Engine.
Rayman 2: The Great Escape	1999	2022	Nintendo DS	Platformer	Ubisoft	Source code for Nintendo DS version was obtained through unknown means and released on February 3, 2022. It also contains assets from the Nintendo 64 version of Donald Duck: Goin' Quackers.
Re-Volt	1999	200?	Windows	Racing game	Acclaim Studios London	Members of the fan-base have acquired the source code of the game around 2004, which was leaked from an anonymous developer who worked on the Xbox Live port. The game community works since then on fan patches and source ports to new platforms like Linux, MacOS and OpenPandora.
Resident Evil: The Umbrella Chronicles	2007	2020	Wii, PlayStation 3	Rail shooter	Capcom	Source code was obtained in a 2020 ransomware attack against Capcom.
Revolution X	1994	2021	Arcade	Shooting gallery	Midway Games	Uploaded by Jason Scott to GitHub on April 6, 2021.
Robotron: 2084	1982	2021	Arcade	Multidirectional shooter	Vid Kidz	On 7 January 2021, Jason Scott uploaded to GitHub the source code for the original arcade version of Robotron: 2084.
Rolling Thunder	1987	2016	Amiga	side-scrolling action game	Tiertex Design Studios	The Amiga version became available on a community forum.
San Francisco Rush: The Rock		2023	Arcade		Midway Games	During October 18–19, 2023, Jason Scott uploaded to GitHub 7 repositories containing source code for a variety of video games and in-house development utilities, including the arcade version of NFL Blitz 2000 and San Francisco Rush: The Rock (an updated version of San Francisco Rush: Extreme Racing).
Silent Hill: Downpour	2012	2024	PlayStation 3, Xbox 360	Survival horror	Vatra Games	Source code was uploaded to Internet Archive on September 3rd, 2024.
The Simpsons: Hit & Run	2003	2021	Various	Racing	Radical Entertainment	Source code obtained from a developer and released on 4chan on August 21, 2021.
Sinistar	1983	2021	Arcade	Multidirectional shooter	Williams Electronics	Uploaded by Jason Scott to GitHub on April 6, 2021.
Smash TV	1990	2021	Arcade	[[ Multidirectional shooter]]	Williams Electronics	Uploaded by Jason Scott to GitHub on April 6, 2021.
Sonic the Hedgehog 2	1992	2006	Genesis	Platformer	Sega Technical Institute	In 2006, portions of the source code were found within the data of an early 1992 prototype build shown in Nick Arcade, as well as symbol tables.
Sonic Unleashed (mobile)	2008	2017	J2ME	Platformer	Gameloft	The J2ME mobile version was uploaded to GitHub in 2017, albeit taken down in 2020.
Speedball 2: Brutal Deluxe	1990	2022	PocketPC / Dreamcast	Sports game	The Bitmap Brothers	Source code to the PocketPC and an unreleased Dreamcast port was found and released in 2022.
Spider-Man 2	2023	2023	PlayStation 5	Action-adventure	Insomniac Games	Source code leaked as part of a ransomware attack on Insomniac Games in December 2023.
Spirit of Speed 1937	2000	2022	Dreamcast	Racing game	Broadsword Interactive	Source code to the Dreamcast version was found and released in 2022.
SpongeBob SquarePants: SuperSponge	2001	2016	PlayStation, Game Boy Advance	Platformer	Climax Development	The PlayStation version's development repository was released on GitHub in 2018, converted from an old Microsoft Visual SourceSafe repository. Curiously, it was discovered that the game contained code from the Linux kernel (specifically the vsprintf function, presumably used for debugging), and therefore violates the GNU General Public License. Source code from a very early build of the GBA version was also found.
S.T.A.L.K.E.R.: Clear Sky (X-Ray Engine 1.5.10)	2008	2014	Windows	FPS	GSC Game World	In August 2014 the source code for the game's X-Ray Engine 1.5.10 became available on GitHub under a non-open-source license. The successor's engine, X-ray 1.6.02, became available too. As of October 2019 the xray-16 engine community fork, "OpenXRay", achieved compiling state and support for the two games Call of Pripyat and Clear Sky with build 558.
Starbound	2016	2023	Windows	Sandbox game	Chucklefish	Leaked onto 4chan on 18 June 2023.
Stargate	1981	2021	Arcade	Scrolling shooter	Vid Kidz	On 7 January 2021, Jason Scott uploaded to GitHub the source code for the original arcade version of Stargate.
Star Trek: New Worlds	2000	2021	Windows	Real-time strategy	Binary Asylum	Source code from a prototype build was uploaded to archive.org in 2021.
Star Wars	1983	2021	Arcade	Rail shooter	Atari, Inc.	During 13–16 October 2021, Jason Scott uploaded to GitHub 78 repositories containing source code to several Atari arcade games. Notable games include Tank 8/Ultra Tank, Quiz Show, Dominos, Sprint 2, Night Driver, Starship 1, Drag Race, Triple Hunt, Super Bug, Canyon Bomber, Avalanche, Super Breakout, Destroyer, Fire Truck, Tournament Table, Video Pinball, Football, Indy 4, Asteroids, Lunar Lander, Sky Diver, Missile Command, Red Baron, Asteroids Deluxe, Centipede, Warlords, Tempest, Battlezone, Space Duel, Gravitar, Liberator, Millipede, Quantum, Food Fight, Black Widow and Crystal Castles.
Star Wars Galaxies	2003	2014	Windows	MMO	Sony Online Entertainment	In 2013, a former Sony Online Entertainment employee leaked a copy of the 2010 production source code for the Star Wars Galaxies client, server, 3rd party libraries and development tools to a group of former players. The code was later leaked beyond its intended recipients and made available online. Live, free to play public servers and public development groups have since come into existence. The source code is centrally maintained by the open-source project SWG Source and is available on GitHub.
Striker '96	1996	2022	PlayStation	Sports	Rage Software	Source code found on a Dreamcast development kit.
Super 3D Noah's Ark	1994	2018	SNES	FPS	Wisdom Tree	In November 2018 the source code for SNES version was bought on eBay and released to the public.
Swashbuckler	1982	2019	Apple II	Fighting	Datamost	In January 2019 Jason Scott uploaded the source code of this game to the Internet Archive.
Team Fortress 2	2007	2012	Windows	first-person shooter	Valve	A 2008 version of the game's source code was leaked alongside several other Orange Box games in 2012. In 2020, an additional 2017 build of the game was leaked.
Tempest 2000	1994	2008	Atari Jaguar	tube shooter	Llamasoft	On 24 August 2008, the source code of Tempest 2000 was released by the defunct Jaguar Sector II website under a CD compilation for Windows titled Jaguar Source Code Collection.
Three Dirty Dwarves	1996	2016	Sega Saturn	Beat 'em up	SegaSoft	Source code found in a prototype build.
Toontown Online	2003	2020	Windows	MMO	Disney Interactive	In 2020, a GitHub user named "satire6" uploaded two repositories containing full source code and assets from a 2010 build of the game.
Tomb Raider II	1997	2021	PlayStation	Action-adventure game	Core Design	Source code was released on archive.org in 2021.
Tony Hawk's Underground	2003	2016	Various	Sports game	Neversoft	The game's C++ source code was leaked in February 2016 to GitHub.
Total Carnage	1992	2021	Arcade	Multidirectional shooter	Midway Games	Uploaded by Jason Scott to GitHub on April 6, 2021.
Trog	1990	2021	Arcade	Racing game	Midway Games	Uploaded by Jason Scott to GitHub on April 6, 2021.
Turrican III	1994	2008	Amiga	Run and gun	Factor 5	Amiga game, source code prototype associated with Peter Thierolf.
Turok: Dinosaur Hunter	1997	2017	Nintendo 64	First-person shooter	Iguana Entertainment / Acclaim Entertainment	In February 2017 the source code of the N64 version was sold on eBay for $2551.99 on a SGI Silicon Graphics Indy development machine which came from the Acclaim Entertainment liquidation. This source code was later released August 26, 2018, then reuploaded, non-encrypted to 4chan the following day.
Trespasser	1998	200?	Windows	Action-adventure, FPS	DreamWorks Interactive	The fan community got the original source code into hand by unknown means and created modifications and unofficial patches with it, the latest DirectX 9 port from 2016 and the development ongoing.
Ultima IX: Ascension	1999	2014	Windows	Role-playing video game	Origin Systems	In November 2014 the Ultima Codex Community was able to acquire the Ultima 9 source code from a former developer for offline archival to prevent permanent loss.
Ultimate Mortal Kombat 3	1994	2009	PlayStation	Beat'em up	Midway Games	The source code and artwork from the PSX version were recovered from floppies in 2009.
Unreal Championship 2	2005	2020	Windows	First-person shooter	Epic Games	Leaked to 4chan on July 29, 2020.
Up'n Down	1984	2018	Atari 8-bit	Racing, maze	Sega	On May 17, 2018, Kevin Savetz uploaded scans of the complete source code of the Atari 8-bit conversion of Up'n Down donated by Charlie Kulas.
Urban Assault	1998	2016	Windows	Real-time strategy	TerraTools	Found on eBay.
Warcraft II: The Dark Saga	1997	2020	PlayStation	Real-time strategy	Blizzard Entertainment	Source code for the PlayStation version was uploaded to archive.org.
Various WayForward games	200?-201?	2024	Various	Various	WayForward	An anonymous seller obtained and sold the source code from many of WayForward's games, including A Boy and His Blob, Adventure Time: Hey Ice King! Why'd You Steal Our Garbage?!!, American Dragon: Jake Long - Rise of the Huntsclan, Barbie and the Magic of Pegasus, DuckTales: Remastered, Mighty Milky Way, Ping Pals, Sigma Star Saga, SpongeBob SquarePants: Lights, Camera, Pants!, The SpongeBob SquarePants Movie, Unfabulous, some unreleased games and LeapFrog titles.
Wipeout	1995	2022	PlayStation, Windows	Racing	Psygnosis	Source code for the PlayStation and Windows versions uploaded by Forest of Illusion.
Wipeout Pulse	2009	2018	PlayStation 2	Racing game	Sony	The PlayStation 2 version contains source code hidden inside a dummy file. The source code is not for the game itself.
Wing Commander series	1990	2011	Various	Space simulator	Origin Systems	The long lost source code of Wing Commander I was given to the fan-community in August 2011 by a former developer for the purpose of long-time preservation. Later most other parts of the series followed.
William Shatner's TekWar	1995	2021	Windows	First-person shooter	Capstone Software	Released on archive.org in 2021.
WWF WrestleMania: The Arcade Game	1995	2021	Arcade	Racing game	Midway Games	Uploaded by Jason Scott to GitHub on April 6, 2021.
The Witcher 3	2015	2024	Windows	Role-playing game	CD Projekt Red	In 2021 source code for the original release & an early version of the "next generation" update was sold for ransom online, with a passworded archive made available publicly. The group responsible later resurfaced in 2024 and released the password for the archive.
Wizardry III: Legacy of Llylgamyn	1983	2021	Various	Role-playing game	Sir-Tech	The source code (for Apple) was released on archive.org in 2021.
Xbox system software	2001	2020	Xbox	Video game console operating system	Microsoft	In May 2020, the Xbox operating system source code was leaked.
Zork and other Infocom games	1977	2008	Various	Adventure game	Infocom	In 2008 a back-up with the source code of all Infocom's video games appeared from an anonymous Infocom source and was archived by the Internet Archive's Jason Scott. On May 5, 2020, the Massachusetts Institute of Technology uploaded to GitHub the source code for 1977–1978 versions and 1977/1989 binaries of Zork. On 12 February 2018, the source code for the original Z-machine interpreter for TRS-80 Color Computer by Infocom was leaked by Brian Moriarty. On November 16, 2023, the source code for the original Infocom intepreter for a wide variety of platforms was uploaded to GitHub. On November 19, the source code for the IBM PC interpreter was uploaded by David Fillmore.

Games with reconstructed source code

See also: List of game engine recreations

Once games, or software in general, become an obsolete product for a company, the tools and source code required to re-create the game are often lost or even actively destroyed and deleted. For instance, with the closure of Atari in Sunnyvale, California, in 1996, the original source codes of several milestones of video game history such as Asteroids and Centipede were all thrown out as trash.

When much time and manual work is invested, it is still possible to recover or restore a source code variant which replicates the program's functions accurately from the binary program. Techniques used to accomplish this are decompiling, disassembling, and reverse engineering the binary executable. This approach typically does not result in the exact original source code but rather a divergent version, as a binary program does not contain all of the information originally carried in the source code. For example, comments and function names cannot be restored if the program was compiled without additional debug information.

Using the techniques listed above within a "bottom-up" development methodology process, the re-created source-code of a game is able to replicate the behavior of the original game exactly, often being "clock-cycle accurate", and/or "pixel-per-pixel accurate". This approach is in contrast to that used by game engine recreations, which are often made using a "top-down" development methodology, and which can result in duplicating the general features provided by a game engine, but not necessarily an accurate representation of the original game.

Title	Original release	Source-code reconstructed	Genre	Original developer	Additional information
Albion	1996 (DOS)	2011	Adventure game	Blue Byte	In 2011, via static recompilation from the original x86 binary executable a port for the ARM architecture of the Pandora handheld was created by fans. The community still updates this recompiled version and released also Windows and Linux builds in 2015, source code available on GitHub under MIT.
Another World	1991	2011	Platform game	Delphine Software International	In 2011, Fabien Sanglard analysed Another World by reverse engineering and reconstructed, based on an earlier approach, a complete C++ source code variant of the internal virtual machine.
Bagman	1982	2010	Arcade game	Valadon Automation	In 2010, the French programmer Jean-François Fabre reconstructed C source code from the game to port it to modern platforms.
Banjo-Kazooie	1998 (Nintendo 64)	2024	Platform game	Rare	Decompiled in 2024 with code released on gitlab.com.
Bermuda Syndrome	1995 (Windows)	2007	Adventure game	Century Interactive	After the end of support for the game, Gregory Montoir reverse engineered in 2007 the game engine and wrote a substitute which allowed the porting of the game to modern platforms, like the OpenPandora handheld.
Boulder Dash	1984 (C64)	2016	Arcade game	First Star Software	The C64 version was bit accurate reverse engineered by enthusiasts in month long work in 2016. The group reverse engineered several more games also from this period, like The Castles of Dr. Creep 3, Miner 2049er, Lode Runner, Manic Miner and Beach Head.
The Castles of Dr. Creep	1984 (C64)	2010	Platform game	Edward R. Hobbs	Robert Crossfield worked on a faithful engine for the game since 2010. The remake/reconstructed version got released for PC on Steam by Edward R. Hobbs & Robert Crossfield in September 2016.
Cannon Fodder	1993 (DOS)	2015	top-down shooter	Sensible Software	In December 2015, Robert Crossfield released version 1.0 of the reverse engineered DOS CD Cannon Fodder version, under the name "OpenFodder" on GitHub under GPL.
Chasm: The Rift	1997 (DOS)	2016	First-person shooter	Action Forms	Around 2016 a reverse engineered version became available on GitHub.
Citadel	1985 (BBC)	2018	Action-adventure game	Superior Software	Buildable, reverse-engineered assembler source for the BBC Microcomputer Model B version of the game was released on the Stardot forums in October 2018, by a user known as Diminished.
Commander Keen 4-6	1991 (DOS)	2021	Sidecrolling shooter	id Software	Between 2019 and 2021 K1n9_Duk3 recreated the source code of Commander Keen 4, 5 and 6, based on the already released source code of Catacomb 3-D, Wolfenstein 3-D and Keen Dreams. When compiled with the Borland C++ v3.0 compiler, compressing the newly created executables with LZEXE 100% identical copies of the original v1.4 executables are achievable. Before that, in 2017 a pixel-accuracy aiming engine re-implementation, based on several disassembly/decompilation efforts, became available by David Gow. C99 source code is hosted on GitHub under GPLv2. Originally only meant for Keen 5, it now supports Keen 4, 5 and 6.
Diablo	1996 (Windows)	2018	Action RPG	Blizzard Entertainment	In 2018 a reverse engineered version was released, based on previously accidentally released debug information and builds by Diablo developers. Builds and compiles successfully for modern OSes.
Diablo II	2000 (Windows)	2015	Action RPG	Blizzard Entertainment	In 2015, an unofficial port for the ARM architecture based Pandora handheld became available by static recompilation and reverse engineering of the original x86 version.
Digger	1983	1998	Arcade	Windmill Software	Reverse engineered by Andrew Jenner in 1998, called Digger Remastered, released as GPL and ported for many platforms.
Driver 2	2000 (PS)	2020	Driving	Reflections Interactive	In 2020 a reverse engineered version was released, based on previously accidentally released debug symbols.
Duke Nukem II	1993 (DOS)	2022	Platform game	Apogee Software	In 2022 reconstructed C code was released.
Dune II	1992 (Windows)	2009	Real-time strategy game	Westwood Studios	In 2009 a group started reverse engineering Dune II under the name OpenDUNE. The resulting code was released under GPLv2 and ported to other platforms like the Pandora.
Dungeon Keeper	1997	2005	realtime dungeon simulator	Bullfrog Productions	Tomasz Lis reverse engineered a version called KeeperFX, the resulting source code is released as GPLv3. After developer Lis stopped working on KeeperFX around 2016 the community took up the work in 2019 and continues the project as KeeperFX Unofficial.
Dungeon Master	1989	2001	Dungeon crawler	FTL Games	In 2001, Dungeon Master (and its successor CSB) was released by Paul R. Stevens in a portable reverse engineered version called CSBwin. CSBwin was reverse engineered from the game's Atari assembler code to a pure C version in months of work. In 2014 Christophe Fontanel released another reverse engineering project which tries to recreate all existing versions.
E.T. the Extra-Terrestrial	1982 (Atari)	2006	Arcade	Atari	In 2006, decompiled by Dennis Debro. Following that, several unofficial fixes for the game were released by a fan site.
Elite	1984 (BBC Micro)	2003	Space trading game	Ian Bell, David Braben	Christian Pinder created Elite: The New Kind as faithful PC version by reverse-engineering platform-neutral C code from the original BBC Micro version of Elite. This version was withdrawn from the main distribution at David Braben's request in 2003. In September 2014, on Elite's 30th birthday, Ian Bell blessed Elite: The New Kind and re-released it for free on his website. Source code of the 1.0 version is available on a GitHub repository.
Escape from Colditz	1991 (Amiga)	2009	Action-adventure game	Mike Halsall, John Law / Digital Magic Software.	Around 2009 some developers reconstructed from the Amiga version a C version under GPLv3. Ported then to many systems.
Exile	1988 (BBC Micro)	2012	Action-adventure game	Peter Irvin, Jeremy Smith	Around 2012 the assembly source code of the BBC Micro version was reconstructed and commented. Later author Peter Irvin blessed also the non-commercial redistribution of the Amiga version of the game.
Freeway	1981 (Atari)	19??	Arcade game	Activision	Decompiled and commented by Rebecca Heineman.
Football Manager	1982	2001	Sports game, Business simulation game	Kevin Toms	In 2001 Paul Robson developed an accurate remake of the original game by reverse engineering in C. The remake has since been ported to the GP2X and Google Android.
Frontier: Elite 2	1993	2006	Space trading game	Frontier Developments	Reverse engineered to C by Tom Morton until 2006.
Frontier: First Encounters (Elite III)	1995	2005	Space trading game	Frontier Developments	Frontier Developments announced in 2000 that FFE would be open-sourced under a GPL-similar license, but this never happened. In response, in October 2005 the game was reverse engineered by John Jordan and builds for modern operation systems were provided. Updated until December 1, 2009, and later continued by other programmers with builds like "FFE_D3D".
Final Fantasy VIII	1999	2019	Role-Playing	Square Enix	In 2019, Marcin Gomulak rewrote the engine from scratch in C#.
Grand Theft Auto III	2001 (Windows)	2020	Action-adventure	DMA Design	Reverse engineered C++ source code, with support for multiple platforms based on GLFW, including the Nintendo Switch. Source code available at GitHub. It was hit with a DMCA takedown on 20 February 2021.
Grand Theft Auto: Vice City	2002	2020	Action-adventure	Rockstar North	Reverse engineering started in early May 2020 and finished in December, being based on the decompiled Grand Theft Auto III code. It was hit with a DMCA takedown on February 20.
Half-Life	1999 (Windows)	2013	FPS	Valve	Since 2002 Valve has released the source code of the game client and the game (server) in its SDK for modder use. The Goldsrc engine and its other components were reverse engineered in context of the Xash3d project. Ports to other systems became available, for instance Android or the OpenPandora.
Inner Worlds	1996 (DOS)	2016	Fantasy adventure platformer	Sleepless Software	Originally shareware, in February 2000 the game was released as freeware in version 1.3. Source code reverse engineered around 2016.
Igor: Objective Uikokahonia	1994 (DOS)	2017	Point and click adventure	Pendulo Studios	Reverse engineered by Gregory Montoir, now hosted on GitHub, currently beta status.
Heart of the Alien	1994 (Sega CD)	2004	Platformer	Interplay Entertainment	After Heart of the Alien became unsupported and unavailable, Gil Megidish took up 2004 the effort of extracting a source code variant from the binary game by reverse engineering to make the game available again on modern platforms. The extracted source code was made open-source and is hosted freely available on SourceForge.
Jak and Daxter: The Precursor Legacy	2001 (PlayStation 2)	2022	Platformer	Naughty Dog	Naughty Dog coded the first three Jak and Daxter games in GOAL, a modified version of Lisp. A group of programmers created a program that could read and decompile GOAL code, which allowed them to reconstruct the game's source code. While all three Jak games are currently planned, the first has the most work done on it - including a port to modern PCs.
Jet Set Willy	1984 (ZX)	2014	Platformer	Software Projects	This classic ZX Spectrum game was disassembled by Richard Dymond back into Z80 source code, and includes some very comprehensive comments.
J.R.R. Tolkien's The Lord of the Rings, Vol. I	1990 (DOS)	2009	Adventure game	Interplay Entertainment	As the game is without official support for many years, a community developer reverse engineered the game engine and created around 2009 a substitute. The LPGLv2.1+ licensed open-source project allowed the porting to modern platforms, for instance Windows, Linux and the OpenPandora handheld.
Kid Chameleon	1992 (Genesis)	?	Platformer	Sega Technical Institute	Reverse engineered assembly of the Sega Genesis game by Sonic fan site Sonic Retro, hosted on GitHub.
KKnD Extreme	1997 (Windows)	2017	Real-time strategy	Beam Software	Reverse engineered and made available on GitHub by Alexandr Parshin.
Little Big Adventure	1994 (Windows)	2004	Action-adventure	Adeline Software International	Reverse engineered after getting an "OK" by Frederick Raynal and placed on SourceForge (later GitHub) as Twin-e.
Manic Miner	1983 (ZX)	2014	Platformer	Bug-Byte	This classic ZX Spectrum game was disassembled by Richard Dymond back into Z80 source code, and includes some very comprehensive comments.
Mercenary, including Damocles and The Dion Crisis	1985	2002 (several years prior; Mercenary)	Adventure game	Novagen Software	A computer scientist fan reverse engineered all of the game engines and created a clone of the complete game series. Source for MDDClone isn't publicly available.
Metroid	1986 (NES)	?	Metroidvania	Nintendo R&D1, Intelligent Systems	The NES game was disassembled by the collaborative work of several developers over the course of years and modified to run on the more powerful MMC3 chip.
Might and Magic 6/7/8	1998 (Windows)	2016	RPG	New World Computing	Reverse engineered as world-of-might-and-magic on GitHub by Alexandr Parshin and other programmers.
Minecraft	2009 (Windows)	2010	Sandbox game	Mojang	The Mod Coder Pack (MCP) offered scripts for de-obfuscation/decompilation of the Java-based version of Minecraft starting in 2010. The Mod Coder Pack was discontinued after Mojang began releasing deobfuscation mappings with each update in 2019.
Nicky Boum	1992	2007	Platform game	Microïds	Reverse-engineered by Gregory Montoir and open-sourced in March 2006 with version 0.1.5. The engine reached with v0.2.0 playable status when development and distribution of the source code was stopped. The source code was made in 2017 available on GitHub for some time, before the repository was set to private.
Oo-Topos	1982 (Apple II)	2015	Interactive fiction	Penguin Software	Penguin Software released several of their Comprehend Adventure engine games as freeware, also from the Transylvania series. After end of official support, Ryan Mallon reconstructed around July 2015 a source code variant of the game's engine to port these games. Ryan Mallon works also on reverse engineering The Lost Vikings engine.
Out Run	1986 (Arcade)	2012	Arcade racing	Sega	Since around 2009 a game enthusiast worked on decompiling source code of Out Run. In 2012 a truthful engine, called "Canon Ball", was released on GitHub. To run the game, the original game's assets are required. Ports to many systems followed, like OpenPandora.
Paper Mario	2000 (N64)	2023	Role-playing video game	Intelligent Systems	Decompiled in 2023 with code released on github.com
Perfect Dark	2000 (Nintendo 64)	2022	First Person Shooter	Rare	Decompiled in 2022 with code released on github.com.
Plants vs. Zombies	2011 (Windows Phone)	2021	Tower Defense	Popcap	Decompiled in 2021 with code released on github.com.
Pokémon Red and Pokémon Blue	1996 (GBC)	2014	Role-playing video games	Game Freak	Reverse engineered assembly of the Game Boy Color game on github.com.
Pokémon Yellow	1998 (GBC)	2014	Role-playing video games	Game Freak	Reverse engineered assembly of the Game Boy Color game on github.com.
Pokémon Gold and Pokémon Silver	1999 (GBC)	2015	Role-playing video games	Game Freak	Reverse engineered assembly of the Game Boy Color game on github.com.
Pokémon Crystal	2000 (GBC)	2014	Role-playing video games	Game Freak	Reverse engineered assembly of the Game Boy Color game on github.com.
Pong	1972	2012	Arcade game	Atari	The available schematics ("source code") was reconstructed and adapted for modern and available electronic parts to a new PCB design in 2012.
RollerCoaster Tycoon 2	2002 (Windows)	2014	Business simulation game	Chris Sawyer	In April 2014, a project to reverse engineer Roller Coaster Tycoon 2 into platform independent C source code, was started under the name OpenRCT2 by Ted 'IntelOrca' John. Hosted as GPLv3 licensed open-source software on GitHub, it requires the original game's graphics and sound assets.
PowerSlave	1996	2015 (console version)	FPS	Lobotomy Software	On May 24, 2015, an unofficial remake based on the PlayStation version was released by Samuel "Kaiser" Villarreal for free. In May 2015 publisher Night Dive Studios acquired the game rights, Villarreal and Night Dive Studios working on a digital distribution re-release. On January 2, 2017, Kaiser released the source code of his reverse engineered engine under the GPLv3 license on GitHub.
		2019 (PC version)			In November 2019 a reverse engineered port of the DOS version of Powerslave was released. The source code was released under the GPLv2 license.
Sid Meier's Civilization	1991 (MS-DOS)	2023 (still ongoing)	Turn-based strategy, 4X	Microprose	In year 2023 the work started on OpenCiv1 project to faithfully rewrite the game source code in platform independent C# language. The source code is hosted on GitHub as Open-source software under MIT license.
Silent Hill 3	2003	2018	Survival horror	Konami	In 2018, Palm Studios published a remake of the engine, written in C++ and using OpenGL.
Skifree	1991 (Windows)	2022	Arcade	Microsoft	In 2022 reconstructed C code was released.
Snipes	1983 (DOS)	2016	early networked Multi player game maze game	SuperSet Software	In July 2016, a faithful port by reverse engineering the original game became available. Permission was granted by original authors Drew Major and Kyle Powell to make it public. The full C/C++ source code is available at GitHub.
Sonic & Knuckles	1994 (Genesis)	?	Platform	Sega, Sonic Team	Reverse engineered assembly of the Sega Genesis game by Sonic fan site Sonic Retro, hosted on GitHub. Also includes a reverse engineered assembly of Sonic the Hedgehog 3.
Sonic Mania	2017 (Windows)	2022	Platform	Christian Whitehead, PagodaWest Games, Headcannon, Hyperkinetic Studios (Plus)	In August 2022, the base game and the 2018 Plus DLC were decompiled, with the code released on GitHub.
Sonic the Hedgehog	1991 (Genesis)	?	Platform	Sega, Sonic Team	Reverse engineered assembly of the Sega Genesis game by Sonic fan site Sonic Retro, hosted on GitHub.
	2013 (Windows)	2021 (Windows)		Christian Whitehead, Simon Thomley	In January 2021, the games' 2013 remaster was decompiled, with the code released on GitHub.
Sonic the Hedgehog 2	1992 (Genesis)	?	Platform	Sega Technical Institute	Reverse engineered assembly of the Sega Genesis game by Sonic fan site Sonic Retro, hosted on GitHub.
	2013 (Windows)	2021 (Windows)		Christian Whitehead, Simon Thomley	In January 2021, the games' 2013 remaster was decompiled, with the code released on GitHub.
Sonic the Hedgehog CD	2011 (Windows)	2021	Platform	Christian Whitehead, Simon Thomley	In January 2021, the games' 2011 remaster was decompiled, with the code released on GitHub.
Space Ace	1984 (Apple IIGS)	2015	Interactive movie	Advanced Microcomputer Systems	In July 2015 Rebecca Heineman released a reverse engineered Apple IIGS source code version on GitHub.
Space Invaders	1978	2019	Arcade	Taito	In December 2019 a C translation by Jason McSweeney was released on GitHub.
Star Castle	1980 (Atari 2600)	2012	Arcade	Atari	Former Atari engineer D. Scott Williamson re-created in three years work Star Castle faithfully for the Atari 2600. After a successful crowdfunding campaign on Kickstarter, he released everything for free on his website, including source code.
StarCraft	1998 (Windows)	2014	Real-time strategy	Blizzard Entertainment	By static recompilation and reverse engineering of the original x86 binary to an intermediate C "pseudo-assembly" source code, an unofficial version for the Pandora handheld and the ARM architecture became available in 2014.
Star Wars Episode I: Racer	1999	2017	Arcade racing	LucasArts	Reverse engineering of the code since 2017. Currently only a small part of the source code is reverse engineered, it is partly emulation. The main functionality is still coming from the original binary where newly created replacement parts are spliced-in in runtime.
Star Wars Jedi Knight: Dark Forces II	1997	2013	FPS	LucasArts	Since 2013, a recreation of the engine has been in development on GitHub.
Strike Commander	1993 (DOS)	2013	Flight simulator	Origin Systems	In 2013 a SC reverse engineering project by Fabien Sanglard with a reconstructed source code variant became available on GitHub as the original source code was most probably lost in the take over of Origin by EA.
Styx	1983	1998	Arcade	Windmill Software	Reverse engineered by Andrew Jenner in 1998, implemented in x86 assembly with the title Styx Remastered and released as GPL.
Super 3D Noah's Ark	1994 (DOS)	2015	FPS	Wisdom Tree	In October 2015 a community reconstructed, under usage of already released id software engine code, source code variant became available on Bitbucket.
Super Bomberman	1993 (SNES)	2015	Action, Maze	Hudson Soft	Reverse engineered assembly and build system of Super Bomberman by Lior Helphon on GitHub. Rebuilds several different versions of the game, and can restore some disabled debug features.
Super Mario Bros.	1985 (NES)	2012	Platformer	Nintendo R&D4	Commented disassembly of SMB on GitHub. A statically reverse engineered version, compiling and running with SDL was developed around 2017–2018.
Super Mario Bros. 3	1988 (NES)	2017	Platformer	Nintendo R&D4	Commented disassembly of SMB3 on GitHub.
Super Mario 64	1996 (N64)	2019	Platform game	Nintendo EAD	In 2016, enthusiasts began to rewrite every function by hand, referencing a MIPS disassembly, then compile the code with the game's original compiler in qemu-irix, resulting in an identical copy of the game. This took advantage of the fact that Nintendo didn't turn on any compiler optimizations for the first Japanese and US releases. Their work was leaked on 4chan in June 2019 but it was finally released in late August of the same year.
Syndicate Wars	1996 (DOS)	2010	Real-time tactics	Bullfrog Productions	In January 2010 a reverse engineering project of the MS-DOS-based Syndicate Wars was finished by two developers and builds for Windows, Mac and Linux were released. It is complete beside networking and joystick code.
The Great Escape	1986 (ZX)	2016	Arcade adventure	Denton Designs	David Thomas started in 2012 a reverse engineering project to create portable C source code from the ZX Spectrum version's binary, which reached in January 2016 compiling state.
The Last Ninja	1987 (Amiga)	2009	Action-adventure game	System 3	Robert Crossfield reverse engineered a faithful engine from the Amiga version of the game since 2009 (inactive from 2014). First two levels were partially completed.
The Legend of Zelda: A Link to the Past	1991 (SNES)	2022	Action-adventure game	Nintendo EAD	Reverse-engineered assembly of the original Japanese Super Famicom version, allowing for a port to the PC written in C. The code is hosted on GitHub.
The Legend of Zelda: Ocarina of Time	1998 (Nintendo 64)	2021	Action-adventure game	Nintendo EAD	Reverse-engineered over the span of two years, users decompiled the PAL debug ROM of the Master Quest release for speedrunners to more deeply understand the game.
Tomb Raider: Chronicles	2000 (PS)	2017	Action-adventure game	Core Design	Around February 2017 PSX SDK tools and debug symbols leaked to a forum which ignited a reverse engineering project on GitHub. Status, compiling.
Touhou Project (1 to 5)	1996	2014	Shoot 'em up	ZUN Soft	"The Touhou PC-98 Restoration Project" was started around 2014 on GitHub on base of found source code of libraries. In progress.
Touhou Project (from 6 onwards)	2002	2014	Shoot 'em up	Team Shanghai Alice	PyTouhou is a free and open-source reimplementation of Touhou 6 engine in Python and now Rust by three French programmers: Emmanuel Gil Peyrot, Thibaut Girka and Gauvain Roussel-Tarbouriech. While the Python branch is mostly complete, albeit for a few bugs, the Rust branch is still a work-in-progress. Other Touhou Project engine reimplementations after the 5th installment are a work-in-progress.
Transport Tycoon Deluxe	1994 (DOS)	2004	Business simulation game	Chris Sawyer/Microprose	In 2003, Ludvig Strigeus started to reverse engineer Transport Tycoon Deluxe and convert the game to C. In 2004, this re-engineered Transport Tycoon Deluxe was released and christened OpenTTD and is still under active development by the community.
Ultima 3: Exodus	1983	2002	RPG	Richard Garriott	Disassembled and ported to GBC in 2001 by Sven Carlberg. Richard Garriott was aware and pleased by this work.
Undertale	2015	2019	Role-playing video game	Toby Fox	The game's decompiled source code was uploaded to GitHub in February 2019, although it has since been taken down.
Zorgons Revenge	1983 (Oric)	2014	Shooter	John Sinclair	Jean-François Fabre created binary translation libraries for Oric BASIC and assembly code to portable C and used it for nine games. Source code re-created and released for: House of Death, L'Aigle d'Or, Le Manoir du Dr Genius, Le Retour du Dr Genius, Rendez-vous de la Terreur, Xenon 1, Strip 21, Zebbie, Zorgons' Revenge. Build available for the OpenPandora.
ZZT	1991 (DOS)	2020	Action-adventure, puzzle	Tim Sweeney / Potomac Computer Systems	ZZT's source code got reconstructed by Adrian Siekierka in 2020. Compilation with Turbo Pascal 5.5 produces an identical .EXE file than the original release. Done with permission from Tim Sweeney (who lost the original source code). The source code is released under a permissive license on GitHub.

See also

• Category:Commercial video games with freely available source code.
• List of open-source game engines
• List of open-source video games
• List of formerly proprietary software
• List of commercial video games released as freeware
• List of freeware games
• List of proprietary source-available software
• Source port
• Source-available software

External links

• Game Source Code Collection at the Internet Archive