This version does not use the 'Advanced Knee Replacement' that the young woman always used in the first version, in this case she uses the Aperture Science Long Fall Boots. Items such as mobility gels, thermal deterrent laser, and leap of faith plates can be seen. The player must go through several portals and solve various puzzles, he finds in each one with new elements that do not appear in it, the first version. The related breadth in the way Portal 2 is played is focused on the similar functionalities of its predecessor. However, the cybernetic bodies of GLaDOS and Wheatley are swapped to confuse the young woman Most of the stages of the game consist of trying to escape certain traps and getting through unexpected situations, receiving the help of Wheatley. Portal 2 offers a guide to find out how GLaDOS tries to keep Chell from leaving the cameras and places a series of obstacles on him that the young woman must overcome. There begins a series of adventures where the young woman must overcome various stages that are really cameras and where Wheatley sometimes reappears, who helps her escape from some circuits.

The young woman encounters an inanimate machine called GLaDOS, who gets rid of Wheatley and sends Chell to a camera circuit that GLaDOS is repairing. The primary facilities are destroyed and abandoned. Wheatley gives directions to Chell, who later heads to the test chambers where the first 'Portal' was developed.

Portal and portal 2 storyline