Tell me about the game, Portal 2, an 11 year old game which you might not know much about.
Portal 2 was released by Valve in 2011, and is available on PC and many console platforms. It is the sequel to the 2007 game Portal, also by Valve. It is a first-person puzzle game where the player must create portals using their portal gun in order to manipulate objects and move through the environment. The main character is a test-subject named Chell, who struggles throughout the series to escape from Aperture Laboratories Computer-Aided Enrichment Center, often being frustrated in her efforts by the artificial intelligence GLaDOS.