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The Orange Box: Portal Hints
How can I get over there? The connecting walkway is broken!
1 of 7: Then use portals.
2 of 7: The wall behind the other walkway is portal-friendly.
3 of 7: However, note that the walkway isn't up against the wall like the one you're currently on.
4 of 7: So you'll need to fire your orange portal partway up the wall.
5 of 7: In fact, put it up next to the ceiling.
6 of 7: Now jump through your blue portal, making sure you don't over- or under-shoot your mark.
7 of 7: It's easy to miss the walkway and fall into the toxic sludge below, so save your game before trying.