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
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