Finally, when you can see the four-dot tile, Next, shoot a portal onto the ceiling above the ledge with the three-dot tile on it. You should land on a piece of floor with a two-dot tile on it. Then make a portal of the other color on the face of the tall white wall, below the level that you're standing on, so you can fall through it.
Look at the ceiling above it, and shoot a portal at the farthest part of the ceiling. There is a tall white wall that you can see. Shoot a portal on the ceiling over the floor across the pit, then use a wall portal to drop over to that side.
Test Chamber 17 - The Weighted Companion Cube will Never Threaten to Stab You.Test Chamber 15 - Cake and Grief Counseling.Test Chamber 14 - You are an Excellent Test Subject.Test Chamber 13 - A very, VERY long time.Test Chamber 12 - Fling Yourself into Space.Test Chamber 11 - The Orange Portal Gun.Test Chamber 10 - Something About Momentum.Test Chamber 07 - Do Not Taunt the High Energy Pellet.Test Chamber 06 - The High Energy Pellet.Test Chamber 04 - Reaching Far Off Places.Test Chamber 02 - Get the Blue Portal Gun.
