You can now sign up on Atari's official beta test web site to test the upcoming free Unreal 2 multiplayer expansion pack. The unreal 2 multiplayer mode is a class-based team game where players fight for control of artifacts and energy using a deadly arsenal of weaponry, vehicles, and defenses. While you are there you can also sign up to beta test the upcoming multiplayer oriented Terminator 3: War of the Machines (thanks HomeLAN).