An open-source video game, or simply an open-source game, is a

video game Video games, also known as computer games, are electronic games that involves interaction with a user interface or input device such as a joystick, controller, keyboard, or motion sensing device to generate visual feedback. This fee ...

whose

source code In computing, source code, or simply code, is any collection of code, with or without comments, written using a human-readable programming language, usually as plain text. The source code of a program is specially designed to facilitate the w ...

is open-source. They are often freely distributable and sometimes

cross-platform In computing, cross-platform software (also called multi-platform software, platform-agnostic software, or platform-independent software) is computer software that is designed to work in several computing platforms. Some cross-platform software ...

compatible.

Definition and differentiation

Not all open-source games are

free software Free software or libre software is computer software distributed under terms that allow users to run the software for any purpose as well as to study, change, and distribute it and any adapted versions. Free software is a matter of liberty, no ...

; some open-source games contain proprietary non-free content. Open-source games that are free software and contain exclusively free content conform to DFSG,

free culture The free-culture movement is a social movement that promotes the freedom to distribute and modify the creative works of others in the form of free content or Free content, open content without compensation to, or the consent of, the work's origin ...

, and open content and are sometimes called ''free games''. Many Linux distributions require for inclusion that the game content is freely redistributable,

freeware Freeware is software, most often proprietary, that is distributed at no monetary cost to the end user. There is no agreed-upon set of rights, license, or EULA that defines ''freeware'' unambiguously; every publisher defines its own rules for t ...

or commercial restriction clauses are prohibited.

Background

In general, open-source games are developed by relatively small groups of people in their free time, with profit not being the main focus. Many open-source games are volunteer-run projects, and as such, developers of free games are often hobbyists and enthusiasts. The consequence of this is that open-source games often take longer to mature, are less common and often lack the production value of commercial titles. In the past (before the 2000s) a challenge to build high-quality content for games was the missing availability or the excessive price for tools like 3D modeller or toolsets for

level design In video games, a level (also referred to as a map, stage, or round in some older games) is any space available to the player during the course of completion of an objective. Video game levels generally have progressively-increasing difficulty t ...

. In recent years, this changed and availability of open-source tools like

Blender A blender (sometimes called a mixer or liquidiser in British English) is a kitchen and laboratory appliance used to mix, crush, purée or emulsify food and other substances. A stationary blender consists of a blender container with a rotating me ...

, game engines and libraries drove open source and independent video gaming.

FLOSS Free and open-source software (FOSS) is a term used to refer to groups of software consisting of both free software and open-source software where anyone is freely licensed to use, copy, study, and change the software in any way, and the source ...

game engines, like the Godot game engine, as well as libraries, like SDL, are increasingly common in game development, even proprietary ones. Given that game art is not considered software, there are no philosophical or ethical obstacle in selling a game where its art is copyrighted and the entire source code is free software. Some of the open-source game projects are based on formerly

proprietary {{Short pages monitor