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The Orange Box: Portal Hints
Now how can I get up to the very highest bit of flooring?
1 of 5: There are three extended wall segments near the big button that's on your current floor, so check them out.
2 of 5: One of them curves upward a bit, and therefore looks promising.
3 of 5: Move your blue portal to the angled wall segment.
4 of 5: Drop down to the bit of flooring that you were on earlier, then drop from it to your orange portal.
5 of 5: That'll propel you out of the blue portal and onto the highest bit of flooring.