Portal 2 is a first person puzzle platform game developed by Valve and released for the Microsoft Xbox 360 in the USA. It is classified under the Puzzle genre. The game follows the protagonist Chell as she explores the Aperture Science facility, using a portal gun to create pairs of linked portals and solve a series of increasingly complex environmental puzzles. The single player experience is enriched by a narrative delivered through scripted events, audio recordings, and interactions with the artificial intelligence GLaDOS, who offers both instructions and dark humor. In addition to the solo campaign, Portal 2 includes a cooperative mode where two players each wield a portal gun and must coordinate their actions to overcome joint challenges. Gameplay emphasizes spatial awareness, timing, and the manipulation of physics objects. The title has been praised by critics for its innovative puzzle design, compelling storytelling, and witty writing. It was added to iOctavio.com on April 22 2011.