Crackdown 2 is the, frankly, amazing sequel to the 2007 game Crackdown.
In Crackdown 2 you return as the Agent hired to clean up Pacific City, but instead of gangs this time around you're taking down hordes of the infected humans known commonly as Freaks, which share the traits of zombies (shambling, moaning, dismembered limbs, feasting on humans) and the weakness of vampires (burning in the sunlight).
Featuring up to four-player online co-op and sixteen player vs player action, Crackdown 2 has it all. It's hilarious to play with friends, it is so funny and absolutely addictive. Here's the launch trailer, prepare for fun and sudden desire to blow up the enemy!http://www.youtube.com/watch?v=zwB0xfwxJ_U