Alien Swarm

Alien Swarm is a 3D, Sci-Fi MMO shooter with a top-down view. Up to four players work together to complete objectives while shooting AI controlled, insect-like aliens. The game supports forty weapons and items, has multiple character and class options, and allows creative players to create their own content!

Download:

http://store.steampowered.com/app/630/

Create Account:

http://store.steampowered.com/app/630/

Official Site:

http://store.steampowered.com/app/630/