Get Swarmed

What happens when a major PC games company like Valve hires a team of modders and allows them to make their own game? You get Alien Swarm, a top down shooter made for the PC that will have you and your friends teaming up for some intergalactic extermination work. The most annoying thing about playing games multiplayer is that you can only play with friends who were also willing to cough up the cash to buy the game. That's the plus side to Alien Swarm, both the game and SDK are available right now from Steam at the awesome low price of FREE.