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The Orange Box: Portal Hints
Chapter 4
1 of 4: See the Testchamber 10 hints for more detailed info on this chapter.
2 of 4: In Chamber 10, look for a camera on the wall near the top of the stairs in the first room. [12]
3 of 4: In Chamber 11, there's a camera on the wall just above the stairs that lead from the elevator to the large observation room. [13]
4 of 4: Chamber 12 has no cameras, so that's all for this chapter.
