Portal 2 draws from the award-winning formula of innovative gameplay, story, & music that earned the original Portal over 70 industry accolades & created a cult following. The single-player portion of Portal 2 introduces a cast of dynamic new characters, a host of fresh puzzle elements, & a much larger set of devious test chambers. Players will explore never-before-seen areas of the Aperture Science Labs & be reunited with GLa DOS, the occasionally murderous computer companion who guided them through the original game. The game’s two-player cooperative mode features its own entirely separate campaign with a unique story, test chambers, & two new player characters. This new mode forces players to reconsider everything they thought they knew about portals. Success will require them to not just act cooperatively, but to think cooperatively. Extensive single player game featuring next generation gameplay & a wildly-engrossing story. Complete two-person co-operative multiplayer game featuring its own dedicated story, characters, & gameplay. Advanced use of physics allow for the creation of a whole new range of interesting challenges, producing a much larger but not harder game. Original music.A massive sequel to the title named 2007s Game of the Year by over 30 publications worldwide. Available worldwide for the PC, PS3, Mac & Xbox 360.