Player 1: Look to the wall in the far centre of the room and you should spot two platforms. Place your first portal on the lower half of the wall by left-hand platform and the second portal on the lower half of the wall of the right-hand platform.
Player 1: Once the spikes have risen up high enough, run onto the platform and then have player 2 switch the laser to the receptor on the wall near you. This will cause the platforms to raise and fall, so cross over to the second platform.
Player 1: Keep jumping into the spiked barricade until you have enough space to fit in, then jump over the beam and set your exit portal on the wall to the left of the exit. This will allow player 2 to step through the first portal and join you by the exit!
Welcome back to Aperture Science, a world where your Companion Cube isn't you're only company. Take control of Chell once again in Valve's sequel which takes you on an humorous and puzzling adventure and in our detail-packed guide we'll show you:
How to solve every test chamber first time.
Conquer every co-op chamber with a friend.
Loads of High Definition screenshots and videos showing you the solutions to every single chamber.
High Definition strategy videos for every achievement in the game.
Uncover all of the hidden secrets and Easter eggs.