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The Orange Box: Portal Hints
Wall Section
1 of 5: After you turn the corner past the eternal orb area, you'll start approaching a large wall section that can't be moved out of your way.
2 of 5: Quickly fire an orange portal so that it'll form on the wall that's to the left of the wall section and just a bit beyond it.
3 of 5: Then turn right, shoot a blue portal into the wall next to you, and quickly step into it but not through it.
4 of 5: Wait for the moving platform to get close to the orange portal, then jump over to it.
5 of 5: As an alternative, you could fire your blue portal into the wall section that's blocking your path, then walk into it when the moving platform is most of the way past it.