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The Orange Box: Portal Hints
How can I get from the button platform back to the door platform?
1 of 3: By using the nearby three-dot platform as an intermediary.
2 of 3: Drop down to the three-dot platform, then look up toward the door's platform.
3 of 3: Fire a blue portal into the concrete wall you see up there, then put an orange portal on the floor nearby and drop gently through it.
