Player 1: Place your entrance portal on the wall in the upper right-hand corner, then turn to your left and fire off your exit portal on the wall that’s in the corner of the room (right-hand side).
Player 2: Run to the switch on your left by the acid and press it once player 1 is waiting by the locked panels.
Player 1: Once you enter the locked area, set a new exit portal on the shoot-able wall on your right.
Player 2: Head through the nearby portal (behind you) and join player 1 in entering the new area.
Player 1: Get your first portal up on the far left-hand corner (upper level). This’ll get you to the switch up here. Now place your second portal on the wall by the switch to your left.
Player 2: Repeat the exact same steps as for player 1 (the whole run should have mirrored movements due to the timing required).
Player 1: Run through the portal so you’re on the upper-level directly opposite the switch. You should spot player 2 directly opposite from you standing by their switch.
Player 2: Once again, follow player 1’s steps and run through the portals to the switch.
Players 1 and 2 Together: Hit your switches at the same time and a timer will start ticking away in the background, so both of you immediately run back through your portals and hit the switch on the ground floor together.
This’ll drop a metal ball that should be dropped in the round switch near the exit. Voila! Exit open!
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.