Hit the red button and you’ll unleash a trail of waste materials from the chute near the start of the chamber.
These will hit the same launch pads you did and they’ll eventually fly past you. A Companion Cube will now be placed in the chute, so once again hit the red button and the Cube will find its way over towards you.
Once you have the Cube in your possession, set it down and create a portal above the large red button in the left-corner of the map (follow the yellow dots if need be) and place a second portal on the wall to your immediate right.
Take your Companion Cube and drop it through these portals and it’ll fall onto the button, opening up the exit for you.
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.