 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 recent years, this changed and availability of open source tools like Blender, game engines and libraries drove open source and independent video gaming.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.