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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.

Motivation[edit]

Commercial video games are typically developed as proprietaryclosed sourcesoftware 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 abandoned.

Description[edit]

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 instantly included source code[edit]

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.^[1] Became commercially successful after the source code release.
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.^[2]^[3]
Barotrauma	2017	2017	submarine simulator	restrictive (only mods)^[4]	commercial	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.^[5]^[6] His previous game, SCP – Containment Breach, is also available as free and open-source software under CC BY-SA license.
Break Arcade Games Out	2019	2019	Action game	Public domain	Public domain	Dan Zaidan	The game was created in the C (programming language) from scratch. The entire development process was live streamed and archived.^[7]. The source code is available for free on Steam^[8] and on Github.^[9]
Bomb Alley	1983	1983	Turn-based strategy	?	commercial	Strategic Simulations / Gary Grigsby	The game used the same engine used by Grigsby's previous Guadalcanal Campaign, which was coded and distributed as uncompiledApplesoft BASIC.^[10]
Diamond Trust of London	2012	2012	TBS	Public Domain	Public Domain	Jason Rohrer	Following a Kickstartercrowdfunding 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.^[11]
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 DOSoperating system for the original IBM PC. Similar early BASIC games which were distributed as source code are GORILLA.BAS and NIBBLES.BAS.
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.^[12] Weizenbaum's original MAD-SLIP implementation was re-written in Lisp by Bernie Cosell.^[13]^[14] A BASIC version appeared in Creative Computing in 1977, written in 1973 by Jeff Shrager.^[15] 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.^[16]
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^[17] 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,^[18]^[19]iPhoneApp Store^[20] and BlackBerryApp World^[21] as the game assets were kept proprietary.^[22]
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;^[23] planned are 600 episodes, one per day. The game's recent prototypes and source code are made available for $15.^[24] The final game will be DRM-free, cross-platform and the source code will be given into public domain two years after its release.
Hydra Slayer	2016	2016	Roguelike	GPLv3	GPLv3 / commercial	Zeno Rogue	Released in 2016 on Steam^[25] and GitHub^[26] as open-source roguelike with focus on mathematics.
HyperRogue	2011	2011	Roguelike	GPLv2	GPLv2 / commercial	Zeno Rogue	Released in 2011 on GitHub^[27] as open-sourcenon-Euclidean roguelike, it was commercialized in 2015 on Steam and other distributors.^[28]
Marvellous Inc	2018	2018	Programming game	GPLv3	CC BY-SA	Marvellous Soft	Marvellous Inc was originally a Ludum Dare entry, inspired by Zachtronics Industries' TIS-100. Expanded and then commercially released in 2018 on Steam for $4.99, source code is on GitHub.^[29]
Jagged Alliance 2 Wildfire (now JA2-Stracciatella^[3

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