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In addition to providing the game free of charge, Valve will release its complete code base, including updates to the Source engine SDK and full Steamworks integration to provide "more insight and examples" for aspiring modders and small-time developers.
Alien Swarm is described as a tactical top-down shooter that "thrusts players into an epic bug hunt featuring a unique blend of co-op play and squad-level tactics." There's also mention of over 40 weapons and equipment with "countless" loadout configurations, four unique classes, eight characters, and 64 achievements.
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