Alien Swarm: Gameplay HD<br />This game is powered by Valve and the Source Engine and is available free of charge here :<br />http://store.steampowered.com/app/630/<br />Release Date: 19 Jul 2010<br />Song : buy it here<br />http://www.amazon.co.uk/Self-Vs-Feat-...<br /><br />FYI : Alien Swarm was first of all a mod for UT2K4 and was adapted to the source engine by a group of talented designers at Valve who were hired from the Mod community.<br />Official website :
