Advantage of such continuation projects is that these games are already "complete" as graphic and audio content is available, and therefore the open-source authors can focus on porting, fixing bugs or modding the games. Examples include Warzone 2100 (a real-time strategy game) and Micropolis (a city-building simulator based on the SimCity source code). Some of the open-source game projects are based on formerly proprietary games, whose source code was released as open-source software, while the game content (such as graphics, audio and levels) may or may not be under a free license. Given that game art is not considered software, there is debate about the philosophical or ethical obstacles in selling a game where its art is proprietary but the entire source code is free software. FLOSS game engines, like the Godot game engine, as well as libraries, like SDL, are increasingly common in game development, even proprietary ones. In recent years, this changed and availability of open-source tools like Blender, game engines and libraries drove open source and independent video gaming. In the 1900s 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. 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.
Many open-source games are volunteer-run projects, and as such, developers of free games are often hobbyists and enthusiasts.
In general, open-source games are developed by relatively small groups of people in their free time, with profit not being the main focus. See also: List of commercial video games with available source code Participants in the Free Knowledge Game Jam 2015, an open source and open data oriented game jam
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