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The Orange Box: Portal Hints
How can I get past this gap?
1 of 6: There are no moving platforms or storage cubes to help you here, so you'll have to rely on portals.
2 of 6: Look around for portal-friendly surfaces.
3 of 6: You'll need to open one portal on this side of the gap, and the other one on the other side of the gap.
4 of 6: The only thing you can use on the other side of the gap is the ceiling, so fire a blue portal onto the ceiling past the gap.
5 of 6: Then open an orange portal in the wall of the narrow corridor you just came down.
6 of 6: Walk through the orange portal to fall down onto the floor past the gap.