Free Alien Swarm PC game from Valve
Alien Swarm is a game release from a group of talented designers at Valve. 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.
My husband and I downloaded this game and had quite a bit of fun with it for a while. Our older kids also downloaded Alien Swarm for their computers. If you like PC games, you should check this one out.
Be sure to check out some of the other pc games on the site as well