Cube is an open source multiplayer and singleplayer FPS game built on an entirely new and very unconventional engine. Cube is a landscape-style engine that pretends to be an indoor FPS engine, which combines very high precision dynamic occlusion culling with a form of geometric mipmapping on the whole world for dynamic LOD for configurable fps & graphic detail on most machines. Cube is special in that it allows in-game editing of levels in full 3D, which can even be done with your friends in multiplayer mode. Cube has two single-player modes similar to Quake and 12 multiplayer game modes.