公式 http://www.alienswarm.com/index.html steam http://store.steampowered.com/app/630/ 4人Co-op対応のSci-Fiトップダウンシューター Valveより無料でリリース &youtube(http://www.youtube.com/watch?v=603izhzohos){425,350} 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. ----