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The Orange Box: Portal Hints
How can I get up to that opening?
1 of 4: Use the fact that all the walls in here are portal-friendly.
2 of 4: Toss an orange portal up near the top of the wall that's directly across from the one with the opening.
3 of 4: Then fire a blue portal onto a spot at your level.
4 of 4: You'll have to jump through the blue portal in order to make it into the large opening.