Wow, here's a Friday surprise. Valve just announced that it's releasing a full version of Alien Swarm, a co-operative shooter based on an old Unreal Tournament 2004 mod, next week. And it’s free. Keep ...

GameSpot may get a commission from retail offers. If you've been looking for an online co-op game with some Alien vibes, the upcoming top-down tactical shooter DarkSwarm might just tickle your fancy.