Portal 2

Portal 2 is a unique first-person Action-Puzzle-Platforming game that tests player's ability to think and act creatively as they use the game's ingenious wormhole creating portal gun to produce their own paths through otherwise sealed surfaces and across the open spaces of the game. Sequel to the original Portal game -- the surprise add-on hit included in Valve Corporation's 2007 release The Orange Box -- Portal 2 continues the storyline from the first game, featuring both new and returning characters, and poses a range of new challenges making for a much deeper game. Additional features include a new two player co-op mode and an original soundtrack.