Portal 2, a sequel to the popular puzzle game, features improved co-op play and, in single-player mode, speed-increasing gels and levitating platforms that can be controlled.
Portal 2, a sequel to the popular puzzle game, features improved co-op play and, in single-player mode, speed-increasing gels and levitating platforms that can be controlled. Photo courtesy Games Press
Portal 2, a sequel to the popular puzzle game, features improved co-op play and, in single-player mode, speed-increasing gels and levitating platforms that can be controlled. Photo courtesy Games Press