The single-player portion of Portal 2 introduces dynamic characters, fresh puzzle elements, and a larger set of devious test chambers. Players explore areas of the Aperture Science Labs and reunite with GLaDOS, the murderous computer companion.
The two-player mode features a separate campaign with unique story, test chambers, and two new player characters. This mode forces players to reconsider everything they thought they knew about portals.
Advanced use of physics allow for the creation of a whole new range of interesting challenges, producing a much larger but not harder game.
A massive sequel to the title named 2007′s Game of the Year by over 30 publications worldwide.