Portal 2 is a first-person puzzle-platformer that plunges you back into the decaying, high-tech ruins of the Aperture Science Enrichment Center. You play as Chell, a silent protagonist who must navigate mind-bending chambers using a "portal gun" to create interconnected gateways on flat surfaces. Set hundreds of years after the original game, the story follows your uneasy alliance with a quirky, chatterbox AI named Wheatley as you accidentally wake the vengeful supercomputer GLaDOS, all while unearthing the dark, humorous history of the facility's eccentric founder, Cave Johnson.