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 of charge, the game thrusts players into an epic bug hunt featuring a unique blend of co-op play and squad-level tactics. With your friends, form a squad of four distinct IAF Marine classes.
Install [steam game] – [Steam store]
Install link will only work if you already have Steam installed on your PC.
Publisher: Valve
Datum: july 2010
Website: http://www.alienswarm.com