Alien Swarm Preview

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."

- Tactical, 4 player co-op action game with a top-down perspective
- Complete game code and mod tools
-Unlock persistent items by gaining levels
-Over 40 weapons and equipment with countless loadout configurations
- 4 unique classes and 8 unique characters