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The Orange Box: Portal Hints
How can I get through that door?
1 of 6: The button that opens the door is on the lower floor.
2 of 6: But the storage cube that you need to place on that button isn't.
3 of 6: Set a couple of portals that'll allow you to get onto the upper walkway.
4 of 6: One way to do this is to fire the orange portal into the wall near the storage cube, then fire the blue portal into the wall directly beneath it.
5 of 6: Walk through the blue portal to get up next to the storage cube, then grab it and drop down to the lower floor.
6 of 6: Set the cube on the big button, then use the portals to get back onto the upper walkway so you can go through the door.
