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]].

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

Motivation

Commercial video games are typically developed as proprietary closed source software products, with the source code treated as a trade secret (unlike open-source video games). When there is no more expected revenue, these games enter the end-of-life as a product with no support or availability for the game's users and community, becoming abandonware.

Description

In several of the cases listed here, the game's developers released the source code expressly to prevent their work from becoming abandonware. 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. Source code availability in whatever form allows the games' communities to study how the game works, make modifications, and provide technical support themselves when the official support has ended, e.g. with unofficial patches to fix bugs or source ports to make the game compatible with new platforms.

Games with released source code

Title	First release	Source code release	Genre	Engine license	Content license	Original developer	Additional information
A Dark Room	2013	2013	Online text-based role-playing game	Mozilla Public License	Mozilla Public License	Doublespeak Games	In July 2013 the source code of the game was put on GitHub under MPL 2.0. Became commercially successful after the source code release.
Abuse	1995	2003	Run and gun	Public domain software	Public domain and Proprietary*	Crack dot Com	Game source code was released as public domain along with the shareware-released media files. Only shareware data, excluding the sound effects, is in the public domain; the rest is proprietary. In 2016 a community developer released a "20th anniversary source port" which enabled custom resolutions, OpenGL rendering, Xbox 360 controller support and fixed the music.
Adventureland	1978	1980	Text Adventure game	Public domain software	Public domain	Scott Adams	Scott Adams Adventureland's source code was published in SoftSide magazine in 1980 and the database format was subsequently used in other interpreters such as Brian Howarth's Mysterious Adventures series.
Airline Tycoon	1998	2015	Simulation game	proprietary	Commercial	Spellbound Entertainment	On 24 March 2015 Airline Tycoon Deluxe was re-released on the digital distribution platform gog.com, including the source code.
Alien Bash I+II	1993	2014	Run and gun	public domain software	public domain	Glen Cumming	Glen Cumming provided media and material of his Amiga games "AlienBash" and "AlienBash II" to the fan community, who was able to restore source code in 2014.
Alien Breed 3D II: The Killing Grounds	1996	1997	FPS	?	Proprietary	Team17	In March 1997 Team17 made the source code of Alien Breed 3D and Alien Breed 3D II freely available on the cover CD of Amiga Format magazine issue 95.
Aliens versus Predator	2000	2001	FPS	Own non-commercial license	Proprietary	Rebellion Developments	Source code released by Rebellion Developments 2001. An unofficial patch project for the PC version, based on the source code, was released and is still updated.
Alpha Waves	1990	2009	early 3D exploration game with platform aspects	?	?	Christophe de Dinechin	Released in 1990 as one of the earliest 3D games with full 6-axis degree of freedom. In 2009, author Christophe de Dinechin released the complete assembly and GFA BASIC source code of the Atari ST version. There is also a started PC port in C++ on sourceforge by the original author.
Akalabeth: World of Doom	1979	1979	Role-playing video game	public domain	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.
Allegiance (now FreeAllegiance)	2000	2004	real-time strategy and Space combat simulator	Shared Source	Proprietary	Microsoft Research	Released by Microsoft Research under a shared source license ("MSR-SSLA") 2004.
Amulets & Armor	1997	2013	first person role-playing video game	GPLv3	Freeware	United Software Artists	In 2013 Amulets & Armor was re-released as freeware on the game's official site and the source code under GPLv3 on GitHub. Work continues for ports to newer systems (Windows, MacOS) and general bug fixes.
Anacreon: Reconstruction 4021	1987	2004	4x game	no license given	Freeware	George Moromisato	Developed by George Moromisato in 1987. Around 2004 the source code of the DOS version 2.00 was released.
Ares	1996	2008	Space Strategy video game	LGPLv3	CC BY-NC-SA Freeware	Nathan Lamont/Bigger Planet Software	Released in 2008. Under continued development for modern systems as "Antares" via GitHub.
Arx Fatalis (now Arx Libertatis)	2002	2011	RPG	GPL	Proprietary	Arkane Studios	The design of Arx Fatalis was heavily influenced by Ultima Underworld. Game source released by Arkane Studios on January 14, 2011.
AstroMenace (now OpenAstroMenace)	2006	2007	Arcade	GPLv3	CC BY-SA 3.0	Viewizard	Based on AstroMenace which was released in February 2007 as shareware for Windows and freeware for Linux. Also the source code of another Viewizard game, the puzzle collection Memonix, was released.
Asylum	1994	2002	Platformer	Public domain software	Public domain software	Andy Southgate	Released by Andy Southgate as public domain and with a SDL port under GPLv3. Later ported also to the Pandora.
Attack of the Mutant Camels	1989	2012	Scrolling shooters	?	?	Jeff Minter	In 2012 the assembly language source code of the Konix version of the game was released on GitHub.
Aquaria	2007	2010	Action-adventure	GPL	Proprietary	Bit Blot	Open sourced with Humble Indie Bundle.
Avara	1996	2016	Shooter game	MIT license	proprietary	Ambrosia Software / Juri Munkki	The MacOS classic game became open source in 2016 when Munkki released the source code upon the game's 20th anniversary.
Aztaka	2009	2011	Action role-playing game		Proprietary	Citérémis	In 2011 Independent game developer Citérémis released a "Developer's Edition" of Aztaka for $9.99 which included also the source code of the game.
Balance of Power	1985	2013	Government simulation game	?	?	Chris Crawford	In August 2013 Chris Crawford released source code of several of his games from his career to the public, fulfilling a GDC 2011 given promise. Beside Balance of Power he released all the source code he could recover, for instance Trust & Betrayal: The Legacy of Siboot, Excalibur, Gossip, Eastern Front (1941), Scram and Legionnaire.
Barony	2015	2016	Rogue-like	GPLv3	commercial	Turning Wheel	The game was released in June 2015 commercially on Steam and gog.com. Source code was released in June 2016 on github.
Batman Returns	1993	2015	sidescrolling Beat 'em up	for educational purposes	for educational purposes	ACME / Chris Shrigley	In March 2015 programmer Chris Shrigley, who worked on the Sega CD version, found the Batman Returns source code and released it for educational purposes to the public. He released also the source code of Magician, Cliffhanger, Gargoyles and some other games from his working career.
Beneath a Steel Sky	1994	2003	Point and click adventure	Beneath a Steel Sky Freeware License	Beneath a Steel Sky Freeware License	Revolution Software	The assembly language source code of the game was made available to the public and ScummVM in August 2003. The source code availability made it possible for the ScummVM project to support the game, which allows the game to be played on Windows, OS X, Linux, Windows CE and other compatible operating systems and platforms.
Beyond Castle Wolfenstein	1985	2005	Stealth game	no license given	Freeware	Silas Warner	The reconstructed source code and the ported game was released by Silas Warner's widow in 2005.
Beyond Protocol (now After Protocol)	2008	2011	persistent, space MMORTS	non-commercial public license	Freeware	Dark Sky Entertainment	Initial design of Beyond Protocol began in 1991. A scaled up beta program began Nov 15th 2007 with an open-beta in 2008. When due to financial issues the game has been shut down, the source code was released on 4 May 2011 on Sourceforge to the public. Based on this source code, community organized development continues until today as After Protocol.
Beyond the Titanic	1986	2009	Text adventure	GPL	GPL	Apogee Software	Game source released on March 20, 2009.
Blades of Exile	1997	2007	RPG	GPL	GPL	Spiderweb Software	Source code and artwork was released by Jeff Vogel (Spiderweb Software) under a GPL license in June 2007.
Blake Stone: Planet Strike	1994	2013	FPS	GPL	GPL	Apogee Software	Released in 2013 to promote the sale of the Apogee Throwback Pack on Steam.
Blue Max	1983	2016	Scrolling shooter	?	proprietary	Bob Pollin	Assembly source code released in 2016 by the author Bob Pollin in the Atariage forum. On the Atariage forum source code of many more games was released.
Bob's game	2004	2016	puzzle, action RPG	source available	Freeware	Robert Pelloni	In August 2016 the source code of the game was released on GitHub under a non-commercial source available software license, to allow the community to contribute. The author claims that he wrote the game originally in C, switched then to Java, and later converted it with an automatic code converter to C++.
Buzz Aldrin's Race Into Space (now Race Into Space)	1993	2007	Simulation	GPLv2	Freeware	Strategic Visions/Fritz Bronner	A port of Buzz Aldrin's Race Into Space to modern operating systems. The license fell back to Bronner as he had a contract clause with Interplay stating that in case Interplay went bankrupt or no distribution happened for some time.
Catacomb	1989	2014	Top-down shooter	GNU General Public License	Proprietary	Flat Rock Software	Early game by John D. Carmack. Released by Flat Rock Software. and ported to SDL.
Catacomb 3D	1991	2014	FPS	GNU General Public License	Proprietary	Flat Rock Software / id Software	Predecessor to Wolfenstein 3D.
Call to Power II	2000	2003	turn-based strategy game	Non-commercial own license	Proprietary	Activision	Civilization clone. Source opened to the apolyton community to allow support with Community patches.
Canabalt	2009	2010	Cinematic platformer	Engine MIT license, game code own proprietary license	Proprietary/Freeware	Adam Saltsman	Released by Adam Saltsman in 2010.
Cart Life	2011	2014	Simulation	CART LIFE'S FREE LICENSE (Permissive license)	CART LIFE'S FREE LICENSE (Permissive license)/Freeware	Richard Hofmeier	In March 2014 the game was removed from all digital distributions and the source code and game was made available for free online, with Hofmeier saying he was finished supporting the game. His webpage went later offline but the source code was mirrored on GitHub.
Civilization IV	2005	2006 (partly)	turn-based strategy	proprietary	proprietary	Firaxis Games / 2k Games	In April 2006 the developers released the source code of the core game mechanic to the public with a Software Development Kit. Additionally to the released source code, as game data and rules are stored in XML files and most of the game is written in Python, much (but not all) of the game is "open" and easily customizable. The game's community produced later many mods, total conversations and optimization patches for the game.
Clonk series (now OpenClonk)	1994	2010/2014	Action, RTS, Platform	ISC	CC BY-NC	RedWolf Design / Matthes Bender	For the series (Clonk 1, Clonk 2 Debakel, Clonk 3 Radikal, Clonk 4 World, Clonk Planet, Clonk Endeavor and Clonk Rage) the C++ source code was released under the "Clonk Source Code License (ISC License)". The content of the original game series was released under the CC BY-NC. Based on Clonk Rage code base the community continues the development as OpenClonk under ISC license and content as CC BY-SA.
Colobot	2001	2012	Educational game, RTS	GPLv3	GPLv3	Epsitec SA	Game source released on March 26, 2012.
Colossal Cave Adventure	1976	2000/2005 (?)	Text Adventure	Public domain software / BSD license (2017)	no artwork (Public domain software)	Will Crowther	Source code variants are at least available as far back as 2000. An authentic version was retrieved in 2005 "from a backup of Don Woods's student account at the Stanford Artificial Intelligence Lab (SAIL)". In February 2017 Eric S. Raymond was involved in the release of version 2.5, under BSD license, the last release by the original author alone.
Commander Keen: Keen Dreams	1991	2014	Platformer	GPLv2+	Proprietary	id Software	In September 2014, after an Indiegogo crowdfunding campaign, the game's source code was released on GitHub.
Conquest: Frontier Wars	2001	2013	Space Real-time strategy	?	Proprietary	Fever Pitch Studios	On December 9, 2013, the source code was bundled with every copy of the game purchased on GOG.com.
CoreBreach	2011	2012	Racing game	GPL (game)/ MIT (3d engine)	Freeware (demo)/ proprietary	CoreCode	Futuristic "anti-gravity" racing game with combat. Source was released after a sales quota was met.
CryEngine 5	2002	2016	FPS	?	NA	Crytek	In 2016 Crytek released their engine as pay-what-you-want including the source code to the public.
Crystal Mines	1989	2011	Arcade	Custom permissive license	Freeware	Ken Beckett/Color Dreams	In August 2011 Ken Beckett, the programmer of the NES game Crystal Mines, released the source code under a custom permissive license to the public. Artwork still proprietary but can be shared for non-commercial, personal use.
Cylindrix	1995	2001	Arcade, Shooter	LGPL	LGPL	Goldtree Enterprises / Softdisk	Around December 2001 the games was ported from DOS to Windows and released under the LGPL to the public.
Cytadela (or The Citadel)	1996	2006	FPS	GPLv2	GPLv2	Virtual Design	In early 2006 the original Cytadela developer offered the Amiga source code of the FPS game to the community, which started a conversation project hosted on sourceforge. Ported to several platforms, latest version released in 2013.
Daikatana	2000	2015	FPS	?	Proprietary	Ion Storm / John Romero	Lacking any further official support after the closure of Ion Storm's Dallas office in 2001, John Romero gave the game's source code to community members, allowing them to develop additional platform ports and bug fixes.
DarkSpace	2001	2009	MMO, Real-time strategy	multiple, own licenses.	Proprietary	Palestar	DarkSpace's game engine called Medusa released by Palestar under multiple licenses.
Death Ray Manta	2012	2015	Arena shooter	?	educational purposes	Bagfull of Wrong / Rob Fearon	The game maker studio based game's source code was released in 2015 with a Humble indie bundle. The assets followed in 2016.
Descent (now D2X-XL)	1995	1997/1999	space 3D FPS	own license	Proprietary	Parallax Software	Game source released by Parallax Software on 1997 (Descent 1) and 1999 (Descent 2). Descent 3 source code seems to be in hands of Rebecca Heineman and were considered 2014 for a release.
Diamond Trust of London	2012	2012	TBS	Public Domain	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.
Digger	1983	2004	Arcade	proprietary	Freeware	Windmill Software	The original source code became available in September 2004 "for historical interest" (together with source code of other Windmill Software games as Styx). There is also an earlier free software reverse engineered variant available by Andrew Jenner, called Digger Remastered, ported for many platforms.
Dink Smallwood	1997	2003	Action RPG	Zlib inspired own license	Zlib/Proprietary (Sound)	Robinson Technologies	Source code published on July 17, 2003 from Seth Robinson. 2008 Artwork published (without some sounds) under a Zlib license.
Discworld and Discworld II	1995	2008	point-and-click adventure game	?	?	Teeny Weeny Games	First announced for release around 2005 by Terry Pratchett, source code became in 2008 available to the ScummVM developers. The code was fast integrated into ScummVM.
DONKEY.BAS	1981	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	1993	1997/1999	FPS	GPL	Proprietary	Id Software	Game source released on December 23, 1997, placed under GPL on October 3, 1999.
Doom II: Hell on Earth	1994	1997/1999	FPS	GPL	Proprietary	Id Software	Game source released on December 23, 1997, placed under GPL on October 3, 1999.
Doom 3	2004	2011	FPS	GPL	Proprietary	Id Software	Game source released on November 22, 2011.
Dragonfire	1982	2003	action	public domain software	public domain	Imagic / Bob Smith	Source code of this Imagic Atari 2600 game was released by developer Bob Smith on May 24, 2003 into the public domain. Many more Atari games got disassembled and commented by the Atari community.
DROD series	1997	2000	Puzzle game	Mozilla Public license 1.1 (and other)	Proprietary	Webfoot/Erik Hermansen	After the author reacquired the rights to the game from the original publisher Webfoot, he released the source code of the game engines. The source code releases include DROD: King Dugan's Dungeon, DROD: Journey to Rooted Hold, DROD: The City Beneath, DROD: Gunthro and the Epic Blunder, DROD: The Second Sky, and DROD RPG: Tendry's Tale without its media assets.
Duke Nukem 3D	1996	2003	FPS	GPL / Build license	Proprietary	3D Realms / Ken Silverman	Game source released on April 1, 2003. Update builds and source ports like eduke32 followed by the game's community.
Dungeon Defenders	2010	2011	Tower defense	?	Proprietary	Trendy Entertainment	In November 2011 there was a "development kit" released as free DLC which included the game's source code.
Dungeons of Daggorath	1982	2001	3D Dungeon crawler	Freeware	Freeware	DynaMicro / Douglas J. Morgan	As for years there has been no production by the publisher Radio Shack of the game, the distributions rights fall back to the developers. Morgan released game around 2001 under a freeware like license to the public, also offering the source code. Following, the game's community has created ports for PC, Linux, RiscOS and PSP.
Eat The Whistle - France 98	1998	2004	Sports game	GPLv2	GPLv2	Hurricane Studios	The France 98 football Simulation video game was released for the Amiga in 1998. Around 2004 Eat the Whistle was released under the GPL on Sourceforge, together with the point and click adventure Escape Towards The Unknown GPL. Later ported to many other platforms.
Eldritch	2013	2014	FPS, roguelike	zlib license	Proprietary	Minor Key Games	In April 2014, the game's source code was released to the public under a permissive zlib license. Content still proprietary and game being sold.
Elite	1984	1999	Space trading game	?	Freeware	Ian Bell, David Braben	In November 1999, developer Ian Bell released on the game's 15th birthday the BBC Micro assembly source code on his website. Following that, Christian Pinder created a platform-neutral C version from the released BBC Micro version, called Elite: The new kind. In 1999–2000 a dispute occurred between Ian Bell and David Braben regarding Bell's decision to make available all versions of the original Elite. The dispute has since ended and the various versions are now available again on Bell's site.
ELIZA (DOCTOR)	1966	1966	Chatbot / Rogerian psychotherapist simulator	public domain software	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.
Enemy Engaged: RAH-66 Comanche vs. KA-52 Hokum	2000	2003	Helicopter Flight simulator	own license	Proprietary	Razorworks	Game source was released somewhen 2003 by Razorworks.
Enemy Nations	1997	2005/2006	RTS	own non-commercial license	non-commercial Freeware	Windward Studios	Game source and artwork was released by Windward Studios under a non-commercial license around 2005/2006.
Falcon 4.0	1998	2000	Combat flight simulator	Proprietary (leaked code) / questionable BSD license (FreeFalcon community development branch)	Proprietary	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 BSD license. As Atari currently owns the intellectual property and Graphsim has the exclusive right to publish, the legality of this source code release is questioned by some community members.
Fish Fillets (now Fish Fillets NG)	1998	2002	Puzzle	GPL	GPL	Altar Games	Released commercially as Fish Fillets in 1998. Source released in 2002 under the GPL.
Flow	2006	2009	Life simulation	? (For educational purposes)	Freeware	Thatgamecompany / Jenova Chen	Around 2009 the flash source code was made available for educational purposes by the developers.
Fort Apocalypse	1982	2015	action	CC BY-NC-ND 2.5	CC BY-NC-ND 2.5 (Freeware)	Steve Hales / Synapse Software	In 2007 the Atari 8-bit game was relicensed to a CC BY-NC-ND 2.5 by Steve Hales and released on IgorLabs. On April 23, 2015, Steve Hales released the assembler source code to Fort Apocalypse on GitHub, also under CC BY-NC-ND 2.5, for historical reasons.
Free Fall	1983	1999	Beat 'em up	?	Freeware	Ian Bell / Acornsoft	In 1999, developer Ian Bell released the video game's BBC Micro assembly source code on his website. Semi-serious he considers it the first ever Beat 'em up video game.
FreeSpace 2 (now FreeSpace 2 Source Code Project)	1999	2002	Space Sim	Non-commercial/Proprietary	Proprietary	Volition	Game source released by Volition on April 25, 2002.
Frogatto & Friends	2010	2010	platformer	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.
Gates of Skeldal	1998	2008	Dungeon crawler role-playing video game	GPL 3	Freeware	Napoleon Games	On 19 November 2007 the game was made freeware by the Czech developer, in 2008 the source code was released under GPLv3 on a sourceforge repository. Later it was translated by fans to English and ported to linux.
Gish	2004	2010	Action	GPL	Proprietary	Cryptic Sea	Source opened with Humble Indie Bundle by Wolfire Games.
Glider PRO	1994	2016	Flight simulator	GPLv2	GPLv2	John Calhoun	On 27 Jan 2016, the source code, graphics, and sound data for Glider PRO were released on GitHub with the source code being licensed under the GNU General Public License v2.
Gladiator	1995	2002	top down perspective action game	GPLv2	GPLv2	Forgotten Sages Games	Released in 1995 as DOS shareware game, in 2002 the game's source code was released under GPL by the developers. Development and porting by the game's community continued on Sourceforge under the name OpenGlad.
Glitch	2009	2013	MMO	client and other parts under CC0	CC0	Tinyspeck	In 2013, one year after the MMO was shut down, most of the artwork and parts of the code were released under the CC0 license.
Gloom	1995	2017	FPS	unlicense	"for historical purposes"	Black Magic	In January 2017 the assembly and BlitzBasic 2 source code of the Amiga Doom clone Gloom was released as public domain software under unlicense on github. The assets were released "for historical and archiving purposes.".
Glypha III	1990s	2016	Arcade	MIT	MIT	John Calhoun	On 27 Jan 2016, the source code, graphics, and sound data for Glypha III were released on GitHub with the source code being licensed under the MIT license. Updated ports for MacOs and iPhone were created afterward.
Gothic 3	2006	2007	RPG	Proprietary	Proprietary	JoWood	Source code was opened by JoWood for the members of "Community patch project" from the game community in 2007.
Grand Monster Slam	1989	2017	Fantasy sports game	?	Proprietary	Rolf Lakaemper, Hartwig Niedergassel	In March 2017 the source code of the game became available via the Internet Archive.
Gravity Force 2	1994	2008	Multidirectional shooter	CC BY-SA 4.0	CC BY-SA 4.0	Jens Andersson & Jan Kronqvist	On September 21, 2008 the developers of the Amiga shareware title Gravity Force 2 released the source code for "nostalgic interest" without specified license. In April 2017 the authors clarified the game and source code license as CC BY-SA 4.0.
H-Craft Championship	2007	2015	science fiction racing game	zlib license	Freeware	Irrgheist	H-Craft Championship was developed by the independent game studio Irrgheist and released by Manifesto Games/Akella in 2007. In 2014, the developers released the game as freeware and the source code under the zlib license in February 2015.
Habitat	1985	2016	early MMORPG	MIT	MIT	Randy Farmer and Chip Morningstar/Lucasfilm Games	The The Museum of Art and Digital Entertainment received the game's source code from its original developers, and restored the code in a Hackathon. In July 2016, the source code was uploaded to GitHub under MIT license.
Hack 'n' Slash	2014	2014	Zelda-like puzzle game	?	Proprietary	Double Fine	With the 1.0 release on September 9, 2014 also the source code of the game was released by Double Fine.
Hacker Evolution: Source code	2007	2015	Hacker game	?	Proprietary	Exosyphen	Released on May 11, 2015 for $49.95 by the indie game developer.
Hammerfight	2009	2011	2D physic based combat game	zlib license	Proprietary	Konstantin Koshutin	For the third Humble Indie Bundle Ryan C. Gordon ported the underlying game engine, "Haaf's Game Engine", to Linux and Mac OS X, and released source code under the zlib license. Relish Games released the original version of HGE 1.8.1 for Windows/DirectX to GitHub under zlib license, too.
Handmade Hero	2014	2014	?	proprietary	Proprietary	Casey Muratori	Senior video game developer Casey Muratori started November 2014 a project to program a commercial C based game from the scratch and documenting the development in a series of videostreams; planned are 600 episodes, one per day. The game's recent prototypes and source code are made available for 15$. The final game will be DRM-free, cross-platform and the source code will be given into public domain two years after its release.
Haunts: The Manse Macabre	2012	2012	turn based strategy	BSD	CC BY-NC-SA	Rick Dakan	The 2012 with $29,000 crowdfunded and in Go programmed game was put on github after the money for further development run out. While a volunteer keeps updating the almost finished prototype, the against the Go 1.0 API build game fails to compile with newer compilers and Go versions.
Heretic	1994	1999	FPS	GPLv2	Proprietary	Raven Software	Game source released on January 11, 1999, relicensed to GPL on September 4, 2008.
Hexen: Beyond Heretic	1995	1999	FPS	GPLv2	Proprietary	Raven Software	Game source released on January 11, 1999, relicensed to GPL on September 4, 2008.
Hexen II	1997	2000	FPS	GPL	Proprietary	Raven Software	Game source released on November 10, 2000.
Homeworld	1999	2003	Space Real-time strategy	Non-commercial license	Proprietary	Relic Entertainment	Game source released 2003. The source code became the base of several source ports to alternative platforms, like Mac, Linux, Pandora, Maemo/N900, or Android using the Simple DirectMedia Layer (SDL) cross-platform multimedia library. As the source code's license requirements limits further development significantly the game's community aims for a re-licensing with the new IP holder Gearbox. In September 2013 Gearbox responded positively to the idea for a re-licensing of the already published source code, noting their efforts in supporting the modding community.
HoverRace	1996	2008	Racing	originally time limited license / later non-commercial GrokkSoft HoverRace SourceCode License.	Freeware	GrokkSoft	Was first published under a time-limited license. On 2008 re-newed with an infinite duration license.
Hovertank 3D	1991	2014	FPS	GNU General Public License	Proprietary	Flat Rock Software/id Software	First 3D game by id Software and John D. Carmack.
Hundreds	2010	2010	Puzzle game	?	?	Greg Wohlwend/Semi Secret	Greg Wohlwend chose to open source his code in 2010, partly with the intent to spur "non-coders" to try coding, as he had. Programmer Eric Johnson of Semi Secret found the open source version and ported the game to iPad in a weekend before notifying Wohlwend, which was later released commercially in an updated version.
Hypercycles	1995	2017	Shooter	GPL	freeware	Bob Hays	Released in January 2017 on github.
In Pursuit of Greed	1996	2014	FPS	non-commercial use, "for educational and personal use only"	Freeware (non-commercial)	Mind Shear Software	Based on Softdisk Publishing's "Raven engine" which powered also ShadowCaster. The game was released (including the engine) later by the developer as non-commercial freeware in 2014.
Infinity	2002	2016	RPG	Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License	Freeware (non-commercial)	Affinix Software	Developed in 2002 as commercial Game Boy Color title (~90% finished) the game was never published. Finally released as non-commercial freeware with source code in August 2016.
Inside a Star-Filled Sky	2011	2011	Top-down shooter	public domain software	public domain	Jason Rohrer	Inside a Star-filled Sky, for purchase for $12, was put by developer Jason Rohrer into public domain, like many other of his games.
Iron Seed	1994	2013	Space trading and combat simulator	GPL	Freeware (audiotracks CC BY-SA by Andrew Sega)	Channel 7	Released as freeware by the authors to promote the development of Iron Seed 2 in the 2000s. Source opened under the GPL by the developers in 2013.
Jagged Alliance 2 Wildfire (now JA2-Stracciatella)	2004	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.
Ken's Labyrinth	1993	2001	FPS	Non-commercial license	Freeware	Ken Silverman	Ken's Labyrinth was released as freeware on November 16, 1999. The source code under a non-commercial license followed on July 1, 2001. A port to modern operating systems such as Windows and Linux using Simple DirectMedia Layer called LAB3D/SDL was created by Jan Lönnberg and released in 2002. A version of the port which includes new higher resolution textures was also created by Jared Stafford.
Kiloblaster	1992	2008	Arcade	Own license	Freeware (with additional restriction)	Epic MegaGames	Allen Pilgrim declared the registered version freeware and released also the source code on August 4, 2008.
Kumquat & Cantaloupe	1996	2012	Maze	undefined	Freeware	Dave Schofield	The Amiga games Kumquat & Cantaloupe, originally released as shareware titles, were re-released as freeware with source code included by the author in November 2012.
Kroz	1987	2009	Maze	GPL	GPL	Apogee Software	Game source released on March 20, 2009.
Larva Mortus	2008	2009	Top-down shooter	only non commercial usage	Commercial	Rake In Grass	Czech independent video game developer (Pavel Tovarys) released the Torque 2D v1.1.3 based source code in 2009 under non-commercial conditions. Several other games' source code were released too.
Lemmings	1991	2010	Puzzle game	?	?	Brutal Deluxe	Brutal Deluxe released the source code of the Apple IIgs port of Lemmings (and a dozen other ports).
Lemonade Stand	1973	1979	Business simulation game	Public domain software (?)	Freeware	Bob Jamison, Charlie Kellner / MECC	The Applesoft BASIC source code was available since 1979. The game was later ported to modern REALbasic and released as free and open-source software for many platforms like Windows and MacOS.
Lemma	2014	2014	Voxel FPS open world parcour	MIT	Commercial	Evan Todd	Despite an unsuccessful crowdfunding campaign in 2014, Lemma was released commercially by the developer DRM-free and also on Steam. The source code is openly developed and available on GitHub under a MIT license.
Lugaru	2005	2010 / 2016 (assets)	Action-adventure game	GPLv2	CC BY-SA 3.0	Wolfire Games	Open sourced with the first Humble Indie Bundle by Wolfire Games. In November 2016 David Rosen relicensed all assets under the open content CC BY-SA 3.0 Creative Commons license which makes Lugaru a fully free video game. In begin 2017 an open source HD version followed.
Magic Land Island (now Pocket Island)	2011	2012	Casual game	MIT license	CC BY-NC-SA	Wooga	Magic Land Island was launched during the GDC Europe in August 2011. In June 2012 the HTML5 game was open sourced under the name Pocket Island on GitHub under MIT license and with the assets under Creative Commons license CC BY-NC-SA.
Magus	1995	2014	Rogue-like	?	Freeware	Ronny Wester	Around 2014 archived on GitHub from other now offline sources. A SDL port is in progress. In 2000 Wester released also the Borland Pascal 7 source code of Cyberdogs (excluding some libraries he had licensed) on his website.
Maelstrom	1992	1995/2010	Shoot 'em up	GPL	CC-BY	Ambrosia Software	Asteroids clone. 1995 source released under GPL. In 2010 Andrew Welch and Ian Gilman released the game's contents under a Creative Commons license.
Marathon 2: Durandal (now Aleph One)	1995	2000	FPS	GPL	Proprietary	Bungie Software	Released by Bungie on January 17, 2000.
MechCommander 2	2001	2006	Real-time tactics	Shared Source Limited Permissive License	Proprietary	FASA Interactive/Microsoft	Source opened under a Shared Source license by Microsoft in August 2006. As of 2017 there is a project fork on github with the goal to port the source code to Linux.
MegaBall	1991	2012	Breakout clone	Apache license v2	Apache license v2	Mackey Software/Ed Mackey	The Amiga game MegaBall was programmed by Mackey Software in 1991-1993. Inspired by Taito's Arkanoid it has several features more. The original author released in 2012 the source code of MegaBall under the Apache license v2.
Meridian 59	1995	2012	MMORPG	GPLv2 (excluding compression and audio libraries)	Freeware	Archetype Interactive	As of February 2010 Meridian 59 has been turned over to the original technical developers, Andrew and Chris Kirmse. On September 15, 2012 they released the game to the public as Freeware and most of the source code under the GPLv2 license.
Miner Wars 2081	2012	2013	6DOF Space Shooter game	own proprietary license	Proprietary	Keen Software House	6DOF action-survival space-shooter simulation-game set in the year 2081. Full game and engine source code released under a restrictive license.
Monster RPG 2	2010	2012	JRPG	zlib license	zlib license	Nooskewl	After a successful Indiegogo campaign, released by Nooskewl under a Public domain like license ("Give it Your Own License") on November 11, 2012. Later changed to zlib license, and the content sold again to be able to pay the server bills.
MiG Alley	1999	2001	Flight simulation	own license	Proprietary	Rowan Software/Empire Interactive	Source opened by Rowan Software/Empire Interactive in 2001.
Mr. Do! (for Gameboy)	1992	2007	Arcade	source opened without defined license	without defined license	Universal Entertainment Corporation	Source opened of the game boy version by developer Wesley Knackers in 2007 on his website.
Myth (series)	1998	2001	Real-time tactics	source opened without defined license	Proprietary	Take 2 Interactive/MumboJumbo	Source opened by Take 2 Interactive/MumboJumbo to the game community in 2001.
Myst Online: Uru Live	2007	2010	MMORPG	GPLv3	Proprietary	Cyan Worlds	"Myst Online: Uru Live" struggled to attract subscribers and was canceled after its first year. Cyan release the game as an open source game in 2010.
Natural Selection	2002	2014	FPS	GPLv2 (most code) / custom (external libraries)	Proprietary	Unknown Worlds Entertainment	In January 2014 Unknown Worlds released the source code for download on GitHub.
Nanosaur	1998	2003	FPS	Own restrictive license	Proprietary	Pangea Software	Around 2003 the Nanosaur source code was made available by the developer under a restrictive license.
NoGravity	1996	2005	3D space space shooter / Wing Commander	GPLv2	GPLv2	realtech VR	Source code released by realtech VR on February 16, 2005.
Nothing to Hide	2013	2013	Stealth game	CC0	CC0	Nicky Case	The crowdfunded surveillance/privacy themed video game prototype by indie game developer Nick Liow was crowdfunded and opened under CC0 on GitHub between 2013 to 2015.
No One Lives Forever 2: A Spy in H.A.R.M.'s Way	2002	2011	FPS	GPLv2	Proprietary	Monolith Productions	Source code released by Monolith Productions/Sierra Entertainment as part of a modding toolkit
Pararena 2	1992	2016	Action sport game	MIT	MIT	John Calhoun	On 27 Jan 2016, the source code was released on GitHub licensed under the MIT license.
PaybackTime 2	1997	2014	turn-based tactics game	public domain software	public domain	Niko Nevatie and Kari Luojus	The turn-based tactics game, inspired by Laser Squad and UFO: Enemy Unknown, was developed by two Finish students in Turbo Pascal and x86 assembly. They marketed their game as shareware for DOS in 1997. The authors released the game in August 2014 as public domain software, including the assets.
Penumbra: Overture	2007	2009	Survival horror with FPS aspects	GPL	Proprietary	Frictional Games	Developed by Swedish developer Frictional Games, the game blends the genres of survival horror, first-person shooter, and adventure. Open sourced with Humble Indie Bundle.
Pinball Construction Set	1983	2013	pinball video game	MIT license	MIT license	Bill Budge, Electronic Arts	In 2013, Budge released the source code to the Atari 800 and Apple II version of Pinball Construction Set to the public on GitHub under the MIT license.
Pirate Adventure	1978	1980	adventure game	?	?	Scott Adams (game designer)	The source code for Pirate Adventure was printed in the December 1980 issue of BYTE, with an addendum in April 1981. This enabled others to discover how the engine worked and to create their own adventures using this or a similar design.
Pitman	1985	1985	Puzzle game	?	?	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 an faithful as possible version from the available variants.
Pixel Dungeon	2014	2014	roguelike	GPLv3	GPLv3	watabou	While sold on Steam for $4.99 it was released in July 2014 on GitHub under GPLv3 including the assets.
Postal	1997	2016	Top-down shooter	GPLv2	proprietary	Running With Scissors	In 2015 the Running with scissors developers announced that they will release the source code of the game "if someone promises to port it to the Dreamcast". In June 2016 the developers gave the source code to a community developer who ported the game to Linux for the OpenPandora handheld. On December 28, 2016, the source code was released on Bitbucket under the GPLv2.
Preppie!	1982	2016	action game	?	?	Russ Wetmore/Star Systems Software	In January 2016 Russ Wetmore released the source code of his Atari 8-bit family games Preppie!, Preppie II and Sea Dragon to the public on the Internet Archive.
Prince of Persia	1989	2012	Cinematic platformer	Proprietary	Proprietary	Jordan Mechner	Apple II source code was long-thought-lost, but was found again and released in 2012. A port of the assembly source code to C and SDL as backend was made by a community programmer.
Project: Starfighter	2001	2008	Shoot 'em up	GPL	Proprietary	Parallel Realities
Quake	1996	1999	FPS	GPL	Proprietary	Id Software	Game source released on December 21, 1999.
Quake II	1997	2001	FPS	GPL	Proprietary	Id Software	Game source released on December 22, 2001.
Quake III Arena	1999	2005	FPS	GPL	Proprietary	Id Software	Game source released on August 19, 2005.
Quadrilateral Cowboy	2016	2016	Puzzle video game	GPL	Proprietary	Blendo Games	Game source released on August 8, 2016 as it is based on the id-tech 4 engine.
Receiver	2012	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.
Return to Castle Wolfenstein	2001	2010	FPS	GPL	Proprietary	Id software	The source code for Return to Castle Wolfenstein and Enemy Territory was released under the GNU General Public License (GPL) on August 12, 2010.
Revenge of the Titans	2010	2011	Tower Defense, RTS	Custom all-permissive	Proprietary	Puppy Games	Java based game. Source code was released by Puppy Games with the success of the second Humble Indie Bundle.
Rise of the Triad	1994	2002	FPS	GPL	Proprietary	Apogee Software/3D Realms	Game source released on December 20, 2002.
Roboforge	2001	2008	Multiplayer Strategy game	"RoboForge, Personal, Non-Commercial Use End User License"	Freeware	Liquid Edge	Announced the game in July, 2000 by Liquid Edge the game was released on May 23, 2001. From July 2008 RoboForge became an Open Source project with the source code for the Java-based client and server under a non-commercial license and as freeware. The game's community continues development.
Rocky Racers	2002	2004	Racing game	Non-Commercial license	Freeware	Positech Games	Released around 2002 by Positech Games, the game's C++ source code was released in July 2004 to the public for free.
Rowan's Battle of Britain	2000	2001	Flight simulation	Empire Interactive License	Proprietary	Rowan Software/Empire Interactive	Source opened by Rowan Software/Empire Interactive in 2001.
RuneSword II	2001	2004	Turn-based strategy	Public domain software	Public Domain	CrossCut Games	In 2004 CrossCut Games released the game into the public domain on SourceForge. Since then there is continuous development by the community on the game.
Ryzom	2004	2010	MMORPG	AGPL	CC	Nevrax	In response to the folding of Nevrax, the Free Ryzom Campaign was launched in order to gather enough funds from donations ("Crowdfunding") from the community to purchase Ryzom and release the game as free software. The campaign was almost successful with €172,988 of the required €200,000 gathered. On May 6, 2010, Winch Gate announced the full release of source code and artwork, and a partnership with the Free Software Foundation.
Santa Paravia en Fiumaccio	1978	1978	turn-based strategy	public domain	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, Texas Instruments TI-99/4A, and the Commodore PET. It has been translated into many programming languages, such as ANSI C, and has been ported to the Palm Pilot.
Savage: The Battle for Newerth	2003	2007	online Real-time strategy, FPS	no license/proprietary	Freeware	S2 Games	The game was turned freeware by S2 Games on September 1, 2006. In 2007 the source code became available to the game community, who now continues development.
Sea Dogs: An Epic Adventure at Sea	2000	2009	pirate game	?	Proprietary	Akella	In 2009 Akella agreed to hand the source code of Sea Dogs' game engine to the game community on end-of-support.
Serious Sam (Serious Engine)	2001	2016	FPS	GPLv2+	Proprietary	Croteam	In March 2016, Croteam released Serious Engine v1.10 as free and open source software on GitHub under the GNU General Public License.
Seven Kingdoms	1996	2008	RTS	GPL	GPL and Proprietary*	Enlight	Source code released by Enlight in November, 2008. *Music is proprietary
Seven Kingdoms II	1999	2009	RTS	GPL	Proprietary	Enlight	Source code released in August, 2009.
Shadowgrounds	2005	2011	Shoot 'em up	own non-commercial license	Proprietary	Frozenbyte	Game source released with a Humble Indie Bundle by Frozenbyte on April 22, 2011.
Shadow Warrior	1997	2005	FPS	GPL	Proprietary	3D Realms	Game source released on April 1, 2005.
Siege of Avalon	2000	2003	RPG	LGPL	Proprietary	Digital Tome	Source code released June 23, 2003.
Silent Hunter II	2001	2002	submarine simulation	?	Proprietary	Ubisoft	Around 2002 Ubisoft had ended the official support while still significant issues existed. Therefore Ubisoft enabled the game's community at Subsim.com to fix the game themselves by giving them the source code. The fans raised $7000 for an unofficial patch development project which fixed most of the issues. The community extended Silent Hunter II also content wise significantly with expansion packs or texture upgrades.
SimCity (Micropolis)	1989 (as SimCity)	2008 (as Micropolis)	City-building game	GPLv3	GPLv3	Maxis (Will Wright/Don Hopkins)	Source code released by Don Hopkins under GPL in 2008. For trademark reasons released under the original working title Micropolis, also known as OLPC SimCity.
Soliter	1994	2009	Puzzle game	?	Freeware	Oldsoft	Zdnek Stary developed at the Czech development studio Oldsoft the solitair game Soliter for the ZX Spectrum which got released in 1994. The game was released by the author in 2005 on his homepage for download, in 2009 the assembly source code followed as scan.
Softporn Adventure	1981	?	Text adventure	public domain?	Freeware	On-Line Systems	A comedic, adult-oriented text adventure game produced for the Apple II in 1981. The game was created by Charles Benton and released by On-Line Systems and became later the base for Leisure Suit Larry 1. Source code became later available. The PC version was also released later as freeware by Al Lowe.
Sopwith	1984	2000	Shoot 'em up	GPL	GPL	David L. Clark	The C and x86 assembly source code to Sopwith was released in 2000, at first under a non-commercial use license, but later under the GNU GPL at the request of fans.
Soul Rider	2000	2003	Snow board simulation/sport game	GPL	Proprietary	Slingshot Game Technology	On 20 Jan 2003 Soul Rider's game engine source code was released to allow ports to alternative OSes.
Spacebase DF-9	2013	2015	Space simulator	CPAL	?	Double Fine	After Double Fine ended the support of the controversy ridden and incomplete game on end of 2014, fans have been working to continue the game's development with the availability of the source code in May 2015 under the CPAL open-source license. First patch became available in October 2015.
Space Engineers	2013	2015	space sandbox game	proprietary	commercial	Keen Software House	On May 14, 2015 the development studio made the source code freely available to the game's community for easier modding on GitHub under a proprietary license (non-open source license).
Spear of Destiny	1992	1995	FPS	ID SOFTWARE LICENSE	Proprietary	id Software	The source code of Wolfenstein 3D, which also covered Spear of Destiny, was released on July 21, 1995.
Speed Haste	1995	2012	racing video game	public domain like license	proprietary	Javier Arevalo Baeza	In 2012 the game's developer Javier Arevalo Baeza released the Borland C source code (minus some commercial library part) for "you can do whatever you want with this code" on GitHub.
Star Control II (now The Ur-Quan Masters)	1992	2002	Action RPG	GPL	Cc-by-nc-sa	Toys for Bob (Fred Ford / Paul Reiche III)	Source code of the 3DO version GPL-released in 2002.
Star Raiders	1979	2015	space combat simulator	?	?	Aric Wilmunder / Atari	The commented assembly source code scan of Star Raider became available in October 2015 in the Internet Archive as scan. Aric Wilmunder opened it up with several other artifacts of his gaming career (e.g. SCUMM). The community typed in the source code double checked in a GitHub project. Shortly before a reverse engineering project was finished, too. A true sequel, also called Star Raiders II, had been under development for some time by Aric Wilmunder. The never released prototype source code was posted publicly in December 2015.
Star Trek: Elite Force II	2002	2003	Action RPG	non-commercial own license (only serverside part)	proprietary	Ritual Entertainment	In November 2003 Ritual Entertainment released the source code of their server-side code base for multiplayer gaming under a non-commercial license.
Star Wars Jedi Knight II: Jedi Outcast	2002	2013	First/Third person shooter	GPLv2	Proprietary	Raven Software	Release of the source code by Raven Software and Activision coincided with the closing of LucasArts by Disney.
Star Wars Jedi Knight: Jedi Academy	2003	2013	First/Third person shooter	GPLv2	Proprietary	Raven Software	Release of the source code by Raven Software and Activision coincided with the closing of LucasArts by Disney.
Starshatter: The Gathering Storm	2004	2011	Space combat simulator	New BSD License	Freeware	Destroyer Studios / Matrix Games	Source code released by Destroyer Studios/Matrix Games on December 14, 2011.
Strange Adventures in Infinite Space	2002	2005/2009	Space Roguelike	GPL	Freeware	Digital Eel	Source was release under GPL by Digital Eel in 2005. Content became freeware 2009.
Strife: Veteran Edition (Strife remaster)	2014	2014	FPS	GPLv3	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.
Stellar Conquest III: Hostile Takeover	1994	2006	Stellar Conquest inspired Space simulation	open source freeware (non-commercial)	Freeware (non-commercial redistribution allowed)	NecroBones / Ed T. Toton III	The Turbo Pascal 6 source code for the VGA DOS game was released in February 2006 together with the game itself as freeware by the developer.
Stellar Frontier	1997	2008	Space simulation	STARDOCK SHARED SOURCE STELLAR FRONTIER LICENSE (non-commercial license)	STARDOCK SHARED SOURCE STELLAR FRONTIER LICENSE (non-commercial license)	Stardock	Stellar Frontier was developed by Doug Hendrix in 1995 and was later licensed and published by Stardock. On August 4, 2006, Stardock Systems closed the official master server. On November 18, 2008, the game source code was released under an own non-commercial license. As result, the game's community took over the support of the game and improved the game, fixed the bugs and security holes with self-made patches.
Super Lemon Factory	2012	2012	Text adventure	proprietary	proprietary	Initialsgames	Based on the Cannabalt engine for iOS, and inspired by it to release the source code.
Supernova	1987	2009	Text adventure	GPL	GPL	Apogee Software	Game source released on March 20, 2009.
Taxman	1981	201?	pacman clone	?	?	H.A.L. Labs / Brian Fitzgerald	Apple II pacman clone from 1981. In August 2015 Rebecca Heineman announced that original developer Brian Fitzgerald allowed to release the source code. GitHub repository is still empty as of February 2017.
Team 47: GoMan	1997	1998	Mech game	public domain software	public domain	47-TEK	Released artwork and source code to public in May 1998. As the Internet Archive has not saved the content of the now offline GoMan page in the end of 1990s, currently there are no known mirrors on the web; the source code seems as of 2017 to be lost.
Telengard	1982	1982	Dungeon crawler, role-playing, roguelike	?	?	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.
Terminal Velocity	1995	2015	flight game	?	?	Mark Randel / Terminal Reality	Became available under a NDA in June 2015. Work on an updated version for modern system started immediately.
The Castle Doctrine	2014	2014	MMO	Public Domain	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 into the public domain. The The Castle Doctrine was developed as an early access game and is now sold on Steam for $14.99.
The Clue!	1994	2000	role-playing adventure game	own license	own license / Freeware	Neo Software	In 2000 the source code was released to the public. The game is since then ported to modern platforms via SDL and receives still updates by the community (2015).
The Prisoner	1980	1980	adventure game	?	?	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.
The Oregon Trail	1971	1971/1978	Role-playing video game	Public domain (?)	Public domain (?)	Don Rawitsch/MECC	Rawitsch published the source code of The Oregon Trail, written in BASIC 3.1 for the CDC Cyber 70/73-26, in Creative Computing's May–June 1978 issue. In 2011 the 1975 and 1978 BASIC source code versions of the game were reconstructed.
The Wizard's Castle	1980	2004	role-playing adventure game	?	?	Joseph R. Power	The BASIC source code of the 1980 developed game was published by the developer in the July/August 1980 issue of Recreational Computing. Ports to other systems followed afterwards.
The Pit Puzzle	1997	2011	Puzzle game	Apache 2.0 License	Freeware	Abe Pralle / Plasmaworks	The DOS game source code was released around 2011 by the author Abe Pralle under Apache 2.0 License on github.
Tread Marks	2000	2017	Tank Combat/Racing	GPLv3	Freeware	Longbow Digital Arts / Seumas McNally	Won in 2000 the Seumas McNally Grand Prize. In January 20, 2017 the source code was released as open source on github.com and the game itself as freeware.
Treasures of a Slaver's Kingdom	2007	2010	Z-machine Text adventure game	Freeware	Freeware	Cumberland Games & Diversions	S. John Ross released the commercial Treasures of a Slaver's Kingdom, which won the XYZZY Award 2007 for the best NPC, in 2010 with Z-machine source code as freeware. More source code of text adventure from the 1970s and 1980s are available at the archive.
To Heart 2	2004	2006	Visual novel	GPL	Proprietary	Aquaplus	Its source code was released by Aquaplus under the GNU General Public License on December 22, 2005 along with the source code for Arurū to Asobo!!, Tears to Tiara, and Kusari. This decision was made due to the inclusion of Xvid derived code; Xvid being distributed under the same license. The source code for all four games is distributed upon request in CD-R format. A copy of the original source code is hosted on github, as also an continued engine project.
To the Moon	2011	2014	role-playing game	GPLv2	Proprietary	Freebird Games	To the Moon was developed using RPG Maker XP engine in 2011. In January 2014 To the Moon was also released for OS X and Linux with the Humble Bundle X. Edward Rudd ported the game with the GPLv2 RPG Maker XP game engine recreation MKXP, other ports followed later. Also a successor game by Freebird games, "A Bird Story", was ported to Linux under usage of MKXP.
Tornado	1993	2017	combat flight simulator	?	Proprietary	Digital Integration / Interplay Entertainment	In March 2016 in the Tornado's community forum, rumors surfaced that Interplay Entertainment was working on a re-release of the game for digital distribution, based on the original source code. The assembly source code finally surfaced on January 2017 on github.com.
Tribal Trouble	2005	2014	RTS	GPLv2	Freeware	Oddlabs	In September 2014 the game's source code was released to the public on GitHub and is now open source under the GPLv2. Development continues in a community fork.
Tribes 2	2001	2012	FPS	Torque engine under MIT, rest is proprietary	Freeware	Dynamix	Many commercial titles were developed using the Torque engine. GarageGames released Torque 3D under the MIT License on September 20, 2012. The Tribes 2 source code beside the Torque engine is not available.
Triplane Turmoil	1996	2009	side-scrolling dogfighting flying game	GPLv3	GPLv3	Dodekaedron Software	In 1996 Triplane Turmoil was originally released as shareware DOS game. In 2009 Dodekaedron Software Creations Oy placed Triplane Turmoil's source code, documentation, images and sounds under the GPLv3, hosted on Sourceforge. The community continued the support and ported the game to other platforms (Linux, Windows) via SDL.
Tyrian (now OpenTyrian)	1995	2007	Scrolling shooter	GPLv2	Freeware/CC-BY 3.0 US	World Tree Games Productions / Epic MegaGames (Jason Emery, Daniel Cook)	The OpenTyrian team ported the closed-source Pascal code of Tyrian to C with permission of Jason Emery in February 2007. The graphic artist Daniel Cook released the artwork shortly after.
Ultima: Escape from Mt. Drash	1983	2003	Role-playing video game	Proprietary	Proprietary	Keith Zabalaoui / Sierra On-Line	On 11 June 2003, the game was ported to PC (under GPLv2 license) by Kasper Fauerby based on the original BASIC source code and some smaller binary reverse engineered parts.
Unreal	1998	2008	FPS	source opened to the community under NDA	Proprietary	Epic MegaGames	Access to source-code granted by Epic MegaGames for the game community around 2008. In 2015 Tim Sweeney announced that he hope to be able to open source one day the engine to the public.
Uplink	2001	2003	Hacking simulation	Proprietary	Proprietary	Introversion Software	Mid-2003 Introversion Software started selling the source code for $45. Usage beside modding and fixing of the game are not permitted by the license. Source code of the games Darwinia + Multiwinia and DEFCON was later sold too.
Urban Chaos	1999	2017	Action-adventure game	MIT license	Proprietary	Mucky Foot	In May 2017 Mucky Foot's Mike Diskett released the source code of Urban Chaos under the MIT license on GitHub.
Vangers	1998	2016	racing and role-playing genre	GPLv3	Commercial	K-D Lab	In March 2016, Vangers source code was released under GPLv3 license. Data was not freed though, so one still needs data files from Steam or GOG.com release in order to run the game.
Vulture for Nethack	1987	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 for $2.99. In October 2013 the game was put into the Steam Greenlight process and successfully released on Steam in January 2016.
Vox	2013	2015	open world simulation	GPLv3	commercial	AlwaysGeeky Games	Vox started life as an entry into the Ludum Dare competition. The game was successfully Steam Greenlighted on November 12, 2013. Around end of 2015 the source code of Vox was made available as open-source software under the GPLv3 on GitHub.
Voxelquest	2014	2016	open world simulation	MIT	MIT	Gavan Woolery	After a successful crowdfunding project on Kickstarter to develop an open-world simulation game in 2014, Gavan Woolery developed several iterations of the game's engine. After running out of funding for further development, he open-sourced with support of the backers the game's engine on github.com under MIT license in August 2016.
Wander	1974	2015	Text adventure	public domain (?)	public domain (?)	Peter Langston	In April 2015 the lost thought source code of Wander, one of the earliest mainframe text adventures, could be acquired from the original author.
Warlords Battlecry III	2004	2006	RTS	Own proprietary license	Proprietary	Infinite Interactive/Enlight Software	On 24 May 2006, the Warlords Battlecry III source code became available to the public. Members of the community (who signed a NDA) have been entitled distributors, which have the legal permissions to allocate copies of the Warlords Battlecry III source code. The source code release resulted in the development of several community-made fan patches and mods.
War Worlds	2013	2014	RTS	Own permissive license	Own permissive license	Codeka / Dean Harding	The mobile strategy game was originally released commercially, and later released to the public to allow the community to continue the support of the game. With help of the community the game's main developer has continued the support since then.
Warfare Incorporated (now Hostile Takeover)	2003	2014	RTS	BSD license	BSD license	Spiffcode	In July 2014 the game's source code and content got open sourced with the BSD license under the name "Hostile takeover" on GitHub. As result the game was ported by the game's community to alternative platforms like the Pandora handheld.
Warzone 2100	1999	2004/2008	RTS	GPLv2	GPLv2, CC	Pumpkin Studios/Eidos Interactive	3D real-time strategy game with a unit design system. First source part was released by Pumpkin Studios/Eidos Interactive in 2004 and the rest was released in 2008.
Witchaven series	1995	2006	FPS	non-given	Proprietary	Capstone Software	Around 2006 Les Bird, a programmer from the 1996 folded game development company Capstone Software, released the source code of the abandoned games Witchaven, Witchaven II, William Shatner's TekWar and Corridor 7: Alien Invasion.
Wolfenstein 3D	1992	1995	FPS	ID SOFTWARE LICENSE	Proprietary	id Software	The source code of Wolfenstein 3D, which also covered Spear of Destiny, was released on July 21, 1995.
Wolfenstein: Enemy Territory	2003	2010	FPS	GPLv3	Proprietary	Splash Damage/id Software	Game source released on August 12, 2010.
Word Whiz	1988	2009	Educational game	GPL	GPL	Apogee Software	Game source released on March 20, 2009.
World Train Royale	2009	2011	Tycoon game	?	Freeware	Versus Software	Sold around 2009 for 10 dollars, the game source code was released on 26 June 2011 on sourceforge.
Worms Armageddon	1999	2002	Deatmatch game	?	Commercial	Team 17	Around 2002 Team 17, impressed by the reverse engineering on Worms Armageddon for "Silkworm", gave David "Deadcode" Ellsworth access to the source code. Over the next years he created unofficial patches, until he joined Team 17 in 2006. Updates are still created as of 2015.
Xargon	1993	2008	Platformer	own license	Freeware (with additional restrictions)	Epic MegaGames	Game source released in 2008 by the programmer Allen Pilgrim. A SDL port followed later by Malvineous.
Xenonauts	2014	2015	Turn-based tactics	?	Proprietary	Goldhawk Interactive	Shortly after the release of the stable version Goldhawk Interactive allowed selected members of the community to access the source code. This resulted in the community edition of the game (Xenonauts:Community Edition, X:CE), which continues development of an independent branch of the game, adding new features and bugfixes.
Zork (also known as Dungeon or Dungeon Adventure)	1977	1978	Text adventure	Public domain software	Public domain	Robert M. Supnik / Infocom	Public domain software ports with source code based on the first "Dungeon" version of Zork, are available in various repositories. Also, Infocom allowed the distribution of the early Fortran version.

Games with available source code

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

Title	Original release	Source code found or leaked	Genre	Original developer	Additional information
Asteroids	1979	1996	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.
Art of Fighting	1992	2014	Fighting game	SNK	Found in a PC9821 (neogeo dev machine) the full source code of the Art of Fighting ASM 68k source code in 2014.
Beatmania 5th Mix	1999	2000	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.
B.O.B. / Space Funky B.O.B.	1993	2008	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.
Captain Comic	1988	2012	Platformer	Michael Denio	In September 2012 the source code of the NES version was offered on ebay for $439.
Chicken Run	2000	2011	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.
Dark Engine (Thief, Thief II, System Shock 2)	1993	2009/2010	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	RTS	Pandemic Studios	Released by a former developer of Pandemic Studios under LGPL to prevent that the game become unsupported Abandonware. Legal status unclear.
Donkey Kong	1981	2008	Platformer	Nintendo	In August 2008 the source code of Donkey Kong in Atari 800 6502 assembly was published at the AtariAge forum by Curt Vendel (the Atari Flashback designer), and was discussed there by the original developer, Landon Dyer.
Double Dragon II: The Revenge	1989	2013	Beat em up	Technōs Japan	In 2013 the Internet Archive put the undeleted assembly sources (DRGNSRC.LZH) of the DOS version for download.
Eve Online	2003	2011	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	Racer game	Acclaim Cheltenham	The source code of the PS2 game came into hands of a community member by unknown means around 2015.
Forsaken	1998	2007	6DOF shooter	Probe Entertainment	In 2007, nine years after the first release, the game itself and its source code were considered abandoned and 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.
GunZ: The Duel	2005	2011	Third-person shooter	MAIET Entertainment	In 2011 the source code of GunZ 1.5 became available online.
Lineage II	2003	2003	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.
Microsoft Entertainment Pack	1996	2004	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.
NBA Jam Extreme	1996	2017	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.
Re-Volt	1999	200?	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.
Rolling Thunder	1987	2016	side-scrolling action game	Tiertex Design Studios	The Amiga version became available on a community forum.
Ultimate Mortal Kombat 3	1994	2009	Beat'em up	Midway Games	The source code and artwork of the PSX version were recovered from floppies in 2009.
Mr Nutz 2	1994	2008	Platformer	Ocean Software	Amiga game, source code prototype associated with Peter Thierolf.
Killer7	2005	2016	Action-adventure game	Grasshopper Manufacture	Sources and assets for the GameCube game were found in October 2016 on an open webserver.
S.T.A.L.K.E.R.: Clear Sky (X-Ray Engine 1.5.10)	2008	2014	FPS	GSC Game World	In August 2014 S.T.A.L.K.E.R.: Clear Sky's X-Ray Engine 1.5.10 source code became available on GitHub under a non-open-source license. The successor's engine, X-ray 1.6.02, became available too.
Starcraft	1998	2017	Real-time strategy	Blizzard	In 2017 it was announced that a potentially 1998 stolen/lost STARCRAFT Gold Master source code CD of Starcraft resurfaced in the hand of an enthusiast. After long contemplation, he sent it back to Blizzard. There was some doubt about the authenticity of this CD, as there was no proof provided. It is unclear if, as indicated in the earlier discussion, a copy of the source code was forwarded to Jason Scott of the Internet Archive for preservation purposes.
Tony Hawk's Underground	2003	2016	Sports game	Neversoft	The game's C++ source code was leaked on February 2016 to github.
Turrican III	1994	2008	Run and gun	Factor 5	Amiga game, source code prototype associated with Peter Thierolf.
Turok: Dinosaur Hunter	1997	2017	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.
Trespasser	1998	200x	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 9	1999	2014	First person 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.
Wing commander series	1990	2011	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.
Zork and other Infocom games	1977	2008	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.

Games with reconstructed source code

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. On the closure of Atari in Sunnyvale, California in 1996, the original source code of several milestones of video game history (like Asteroids or Centipede) were thrown out as trash.

When much time and manual work is invested it is however still possible to recover or restore a source code variant which replicates the program's functions accurately from the binary program. Techniques used here are decompiling, disassembling and reverse engineering the binary executable. This approach typically does not result in the exact original source code but a diverging version as a binary program does not contain all information originally carried in the original source code. Comments and function names cannot be restored if the program was compiled without additional debug information. The here given in "bottom up" development methodology re-created source-code of games is able to replicate the behaviour of the original game exactly ("clock-cycle accurate", "pixel-per-pixel accurate"), unlike game engine recreations which are often made in top down methodology resulting in general game engines and not accurately representing the original game.

Title	Original release	Source code reconstructed	Genre	Original developer	Additional information
Albion	1996	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.
Bermuda Syndrome	1995	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	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	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 on September 2016 for $2.99.
Cannon Fodder	1993	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.
Commander Keen 5	2001	2017	Sidecrolling shooter	Id software	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 II	2000	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.
Dune II	1992	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	Tomasz Lis works on reverse engineering (ongoing) a version called "KeeperFX", the resulting source code is released as GPLv3.
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	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	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	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	2012	Action-adventure game	Peter Irvin	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	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".
Half-Life	1999	2013	FPS	Valve Software	Around 2013 Valve released with the SDK some source code parts (server). The client and the Goldsrc engine parts were reverse engineered in context of the Xash3d project. Ports to other systems became available, for instance Android or the OpenPandora.
Igor: Objective Uikokahonia	1994	2017	Point and click adventure	Pendulo Studios	Reverse engineered by Gregory Montoir, now hosted on github, currently beta status.
Heart of the Alien	1994	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.
J.R.R. Tolkien's The Lord of the Rings, Vol. I	1990	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.
Little Big Adventure	1994	2004	Action-adventure	Adeline Software International	Reverse engineered and placed on sourceforge (later GitHub) as "Twin-e" after getting an "OK" by Frederick Raynal.
Metroid	1986	?	Run and gun/Action-adventure game	Nintendo	The NES game was disassembled by the collaborative work of several developers over the course of years.
Minecraft	2009	2010	Sandbox game	Mojang	The Mod Coder Pack (MCP) offers scripts for de-obfuscation/decompilation of the Java-based version of Minecraft.
Nicky Boum	1992	2007	Platform game	Microïds	Reverse engineered by Gregory Montoir and open sourced in March 2006 with version 1.5. The engine reached playable status and version 0.2 when development and distribution of the source code was stopped. The source code was made later available again on github.
Oo-Topos	1982	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	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.
Pokémon Red and Pokémon Blue	1996	2014	Role-playing video games	Nintendo	Reverse engineered assembly of the Game Boy Color game on github.com.
Pokémon Crystal	2001	2014	Role-playing video games	Nintendo	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	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. As of November 2015, while the project has not fully reached the goal of substituting 100% of the binary's functionality, the port is playable and for many platforms builds are available.
PowerSlave	1996	2017	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.
Snipes	1983	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.
Super Bomberman	1993	2015	Action, Maze	Hudson Soft	Reverse engineered assembly and build system of Super Bomberman by Lior Halphon on GitHub. Rebuilds several different versions of the game, and can restore some disabled debug features.
Super Mario Bros	1985	2012	Platformer	Nintendo	Commented disassembly of SMB on GitHub.
Space Ace	1984	2015	Interactive movie	Advanced Microcomputer Systems	In July 2015 Rebecca Heineman released a reverse engineered Apple IIGS source code version of Space Ace on GitHub.
Star Castle	1980	2012	Arcade	Atari	Former Atari engineer D. Scott Williamson re-created in 3 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	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.
Strike Commander	1993	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 (Abandonware).
Super 3D Noah's Ark	1994	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.
Syndicate Wars	1996	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's complete beside networking and joystick code.
Tennis for two	1958	2008	Arcade	William Higinbotham	In 2008 Tennis for Two, a video game from 1958 and one of the earliest video games, was recreated using partly modern parts.
The Great Escape	1986	2016	Arcade adventure	Denton Designs	David Thomas started in 2012 a reverse engineering project to create portable C source code from the DOS version's binary, which reached in January 2016 compiling state.
The Last Ninja	1987	2009	Action-adventure game	System 3	Robert Crossfield reverse engineered a faithful engine from the Amiga version of the game since 2009. First three levels complete.
Touhou Project	1996	2014	Shoot 'em up	Team Shanghai Alice	"The Touhou PC-98 Restoration Project" was started around 2014 on GitHub on base of found source code of libraries. In progress.
Transport Tycoon Deluxe	1994	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.
Zorgons Revenge	1983	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.

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 commercial software with available source code
• List of formerly proprietary software
• List of commercial video games released as freeware
• List of freeware games
• Source port

External links

• Open source games at Curlie
• Game Source Code Collection at the Internet Archive
• Liberated Games, specialized on open sourced computer games
• Open Source Game Clones, specialized in open source variants of commercial games
• Video Game Source Code Repository, archive of historical video game source code