Play the sniper, the assault trooper, the scout or the alien in this squad-based sci-fi shooter game. Play solo through six worlds in the extensive single-player campaign, or play cooperatively with up to 3 friends via split-screen or System Link. Battle it out in a multitude of competitive death-match modes with up to 8 players. Download new content including campaigns, mission and maps to keep the game fresh for incredible re-playability.