Alien Arena 2007

Alien Arena 2007 is a standalone freeware online deathmatch game with fast paced action, tons of content, game modes and resources. The engine features modern effects such as real-time lighting and shadows, light bloom, reflective surfaces, shaders and much more, while still being able to run even on modest systems. There is a large community of players, stats tracking, and a growing number of 3rd party maps, models and add-ons for the game.

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http://cor.planetquake.gamespy.com/arena