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Portal 2 Hints
How can I get that door open?
1 of 6: Notice the large X that's on the wall just to the left of the door.
2 of 6: Visually follow the blue dots that lead from the X to the door-opening device.
3 of 6: It's a large red floor button, so how might you activate it?
4 of 6: Why not try standing on it?
5 of 6: Doing so will open the door.
6 of 6: However, when you get off the button, the door will immediately close.