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.
OS: Windows 7 / Vista / Vista64 / XP CPU: Pentium 4 3.0GHz RAM: 1 GB for XP / 2GB for Vista Graphics: DirectX 9 compatible video card with 128 MB Shader model 2.0. ATI X800 NVidia 6600 or better Sound: DirectX 9.0c compatible sound card HDD: At least 2.5 GB of free space