Saw this recently. It kind of looks like Alien Breed, but with four person co-op instead of two. The production values look pretty high and who doesn't already own HL2? If co-op is your thing (*cough* ...

Alien Swarm - Free Source Engine co-op mod ShaggyMoose Jul 17, 2010 Jump to latest Follow Reply ...

All the Latest Game Footage and Images from Alien Swarm Alien Swarm is a game and Source SDK release from a group of talented designers at Valve who were hired from the Mod community. Available free ...