Cube is a first-person shooter video game and also the name of its game engine which is free and open source software. Engine and game were developed by Wouter van Oortmerssen. It runs on a variety of operating systems, including Microsoft Windows, Linux, FreeBSD, Mac OS X, iPhone and even Pocket PC devices with 3D acceleration such as Dell Axim x50v[6]. It uses OpenGL and SDL. Cube features both singleplayer and multiplayer gameplay. The game contains a built-in level editor.