Epic is the proprietor of four successful game engines in the video game industry. Each Unreal Engine has a complete feature set of graphical rendering, sound processing, and physics that can be widely adapted to fit the specific needs of a game developer that does not want to code its own engine from scratch. The four engines Epic has created are the Unreal Engine 1, Unreal Engine 2 (including its 2.5 and 2.X releases), Unreal Engine 3, and Unreal Engine 4.