Cube 2: Sauerbraten is a free multiplayer or singleplayer first person shooter, built as a major redesign of the Cube FPS.
Free single and multi player 1st person shooter game with some satisfying fast oldskool gameplay. A large variety of gameplay modes from classic SP to fast 1 on 1 MP and objective based teamplay, with a great variety of original maps to play on. Much like the original Cube, the aim of this game is not necessarily to produce the most features and eyecandy possible, but rather to allow map or geometry editing to be done dynamically in-game, to create fun gameplay and an elegant engine. The engine supporting the game is entirely original in code and design, and its code is Open Source.