Portal 2

Portal 2 is the sequel to Portal. First hinted in the updates made to Portal in March 2010, it was announced on March 5, 2010 to be released in Fall 2010.

Portal 2 was previewed in the twelve page cover story of the April 2010 issue of GameInformer, revealing some plot details and new gameplay features. It has also been confirmed that GLaDOS is indeed still alive, and is slated to return as the main antagonist. In addition, GameInformer and other sources have also confirmed a co-op mode for up to two players with its own separate campaign.