Cube is a first-person shooter video game that shares the name of its free and open-source engine (zlib-licensed). The engine and game were developed by Wouter van Oortmerssen. It runs on a variety of operating systems, including Microsoft Windows, Linux, FreeBSD, OS X, AmigaOS 4, AROS, iPhone, Wii and Pocket PC devices with 3D acceleration such as Dell Axim x50v. It uses OpenGL and SDL. Cube has both single-player and multiplayer gameplay. The game contains a built-in level editor. A sequel has been made called Cube 2: Sauerbraten.