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The Orange Box: Portal Hints

How can I get a cube to this door's button?

1 of 5: Try going down the other part of the hallway.
2 of 5: Some stairs will rise up in front of you.
3 of 5:
Move up them and onto the higher floor quickly, since they'll descend soon after you near their top.
- What do I do if I'm still on the stairs when they descend?
4 of 5:
In the room past the stairs, you'll find the cube you're after in one corner, way up out of reach.
- How can I get that cube down to the floor?
5 of 5: Take the cube down the stairs and over to where you can drop it on the door-opening button.

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