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The Orange Box: Portal Hints
How can I move up to the transparent flooring?
1 of 4: Look up at it, and beyond it.
2 of 4: You see that orange portal in the ceiling?
3 of 4: If you open a blue portal and go through it, you'll fall straight down onto the transparent flooring.
4 of 4: So open a portal in the wall or floor of the room you're in and go through it.
