Portal2

Portal2 was introduced in 2011 as an American puzzle-platform video game; it is associated with Valve. Chell returns to Aperture Science and uses linked portals to solve test chambers while confronting GLaDOS and the unstable personality core Wheatley. The game is widely acclaimed for puzzle design, writing and cooperative play. Collector records for Portal2 bring together character references, maker credits, versions, and release chronology.