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2 of 9: Start by dropping your companion sphere down into the pit area.
3 of 9: Fire a blue portal onto the wall just to the left of the glass wall, and at the same height as the big window (or just a little bit higher).
4 of 9: Put an orange portal into a nearby wall at your level and carefully walk into it.
5 of 9: While standing in the portal, you should be able to look through the big window and see a small concrete wall section that's on the other side of the glass wall.
6 of 9: Try firing a blue portal through the window and onto the bottom part of that concrete wall. If you can't, edge forward a bit more and try again.
7 of 9: When it works, you'll be dropped down into the pit with your sphere.
8 of 9: Throw an orange portal onto the floor, then grab the sphere and drop through it.
9 of 9: You'll find yourself next to the hallway that leads to the exit area.
