Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. 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.