Top 10 Co-Op Games 2011

Here's a shiny, updated list of our Top 10 Co-Op Games of all Time.

Portal 2

Portal 2 might have an incredible single-player campaign, but it's also got a lengthy (and entirely separate) co-op campaign for two players. You play as either Atlas or P-Body and rummage around various Aperture Science laboratories, completing increasingly devious puzzles in each one, in order to assist demented computer AI GLaDOS. Most co-op games test your trigger finger, but Portal 2 will make you and a friend flex the gray matter.