Alien Arena 2007 is a multiplayer online deathmatch game based on the GPL id source code. Powered by version 6.0 of the CRX engine, this game features incredibly smooth and fast gameplay with next-generation engine features such as shaders, realtime lighting and shadows, lensflars, light bloom and reflective water. The game includes 37 maps, eight weapons (with alt-fire modes), ten player characters, mutators, five gameplay modes, and an in-game server browser. Version 6.02 fixes a minor bug with the Galaxy server browser that is included with the game.