Alien Swarm: Reactive Drop - F2P, Co-Op
Grabbing this sucker and going to pew pew some aliens when I get home. You can also TK in this game as well I believe and you have to power rush through levels killing swarms of bugs and parasites that do nothing but find ways of killing you off. The number of co op players, as the trailer said, is between 4 and 8. So grab your buddies!