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The Orange Box: Portal Hints
How can I get up these stairs?
1 of 7: Notice that only the bottom few steps will collapse under your weight.
2 of 7: Instead of stepping on them, you could jump onto the left-hand railing and go up along it, jumping when necessary.
3 of 7: Or you could use portals to shortcut your way to the walkway past the stairs. All of the walls in this room are portal-friendly.
4 of 7: There's another solution that you could use.
5 of 7: After collapsing the lower steps, find a nearby barrel and set it on the floor next to the lowest unbroken step.
6 of 7: Then you can jump onto the barrel, and from there onto the unbroken stairs.
7 of 7: Or actually, you might could jump up there without the aid of a barrel.