As the player explores the depths of Aperture Science in the midsection of Portal 2, they’ll encounter fan-favorite character Cave Johnson. His tests revolve around using different gels to reach their ...

After entering the chamber, portal up to the platform at the other side of the room (there's a "Thank You" sign on the wall). Fire a portal beneath the Propulsion Gel tube, and another on the wall ...

As players enter Chapter 7 of Portal 2, they begin to really start feeling a spike in puzzle difficulty thanks to the sparsely populated test chambers of old Aperture. Due to the dilapidated aesthetic ...