cube 2 isn't even really a game so much as a tech demo of sorts for the map technology and I have no idea why people still play that stuff as a game. its pretty well optimized visually (my old geforce FX 5200 could handle this on high with around 15-20 frames), and the shaders are pretty and all but the textures and models and stuff seem hacked together, especially the player model which last time i checked is low-poly and ugly like it's straight from an old quake-era game or something
the engine's map format and collaborate mapping system however is pretty amazing, being able to construct a map collaboratively with a friend and use it in the game itself is pretty cool especially since the map format filesize is absolutely tiny (not including textures).
Poll