Alien Swarm, a class- and squad-based game that embroils players in a space marine-vs-alien bugs fragfest, is finally out. What's more, this multiplayer PC shooter is now free to play, the only catch is that you must have a Steam account. The game is powered by the Source engine so expect impressive graphics and physics. (Examples of Source-powered games: Half-life 2 and Counter Strike Source.)
"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."Links on where to download Steam and the 3rd-person shooter game after the jump.
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>>>Get Steam HERE (registration required).
>>>Get the game HERE