An open-source video game, or simply an open-source game, is a video game whose source code is open-source. They are often freely distributable and sometimes cross-platform compatible. Many are included in Linux distributions as a result.Open source games which are free software and contain exclusively free content are called free games. Most free games are open-source, but not all open-source games are free software; some open-source games contain proprietary non-free content.