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The Orange Box: Portal Hints
How can I enter the room?
1 of 6: Examining it, you'll find that its one door is padlocked.
2 of 6: So you'll have to portal your way past the door like you did with the last padlocked door.
3 of 6: On your side of the fence, the bottom of the elevator shaft is concrete, so fire an orange portal into it.
4 of 6: Crouching down and looking into the room past the fence, you'll see that there's a large ledge in there made of concrete.
5 of 6: Fire a blue portal at the bottom of the ledge, then drop through the orange portal.
6 of 6: Crouch-walk out from under the ledge to enter the room past the fencing.