Game details
Co-operative multiplayer game and complete code base available for free.

A structured reading of the experience this game offers. It is modelled from available source material, not a claim about what every player will enjoy.
Current evidence: Steam storefront metadata
These are anonymous game-to-game comparisons, based on the strongest shared experience signals. They are not a personal recommendation.
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. Plan your attack using an unlockable arsenal of weapons with countless loadout configurations against a wide variety of aliens. Blaze your way through an overrun, off-world colony, eradicating the alien infestation in environments ranging from the icy planet's surface, to a subterranean lava-flooded mining facility. Along with the game get the complete code base for Alien Swarm that features updates to the Source engine as well as the SDK. Alien Swarm adds 3rd person camera, depth of field, improved dynamic shadows and a wide variety of gameplay additions to the Source engine. 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 Matchmaking, Steam Cloud, Steam Stats 64 achievements Tile-based map generation tool Powered by Source and Steam






