From the floor, aim up at one of the pillars high up, so you’ll land on the metal girder once you step through. Turn to face the wall with the door and fire a portal onto the slanted wall above the door.
Now set a portal on the ground far below you and then fall down into it. You should sail through the portal above the door, onto the blue gel and you’ll find yourself being bounced up to the next tier of the platform.
At the back of this section there’s a light wall panel on the floor, so set a portal here, drop down a level and then once again drop down towards the ground, through a portal and you’ll sail up into the air, overlooking a large shoot-able section of floor on the top-tier.
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.