Portal 2

Portal 2 is a first-person puzzle-platformer game that expands on the original with a rich story, new mechanics like gels and light bridges, and a full co-op campaign. Players use the Aperture Science Handheld Portal Device to solve increasingly complex test chambers. Available on PC, PlayStation 3, Xbox 360, and later platforms. Find cheat codes, guides, and tips to master every chamber and unlock all achievements.