Cube Engine

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Cube 2: Sauerbraten 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. Level editing has never been so much fun: a press of a key allows you to modify the geometry / textures / entities in-game, on the fly. Even more novel, you can make maps together with others online, in the unique "coop edit" mode (!) The engine, though designed for simplicity and elegance as opposed to feature & eyecandy checklists, still competes nicely thanks to its novel "6-directional heighfield deformable cube octree" world structure that is the basis for its in-game editing. Occlusion culling, pixel & vertex shaders, very accurate lightmapping, robust custom physics system, network system, models, sound, scripting... Go download it on the Sauerbraten homepage.
AssaultCube AssaultCube is probably the best Cube "mod" ever created. It comes with all new content and is playable as a standalone game. The gameplay provides a more "realistic" gameplay experience than Cube, featuring more modern weaponry and environments. Many gameplay modes are provided including CTF. Go to the AssaultCube homepage.	Cube Cube is the original game that started it all. Though it has been surpassed in almost every way by Cube 2, it is a game in its own right. Most importantly, it comes with over 100 (!) maps, most of which are not available in Cube 2, with extensive single and multi player content. Cube is also smaller in every way, in download, in hardware requirements (runs well on older video cards!), and in source code (the absolutely tiny code base is a very easy start for those wishing to experiment). It also has some unique engine features such as the high precision dynamic occlusion culling, and its heighfield based level format. Go to the Cube homepage.
	AssaultCube AssaultCube is probably the best Cube "mod" ever created. It comes with all new content and is playable as a standalone game. The gameplay provides a more "realistic" gameplay experience than Cube, featuring more modern weaponry and environments. Many gameplay modes are provided including CTF.