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The Orange Box: Portal Hints
Chapter 1
1 of 9: See the Testchamber 00 hints for more detailed info on this chapter.
2 of 9: Ignore all the cameras that you see before you get the portal gun in Chamber 02. They can't be destroyed without using cheats, and therefore don't need to be destroyed to get this achievement.
3 of 9: Right after you grab the portal gun, fire a blue portal at the camera that's high up on one wall, directly above the large glass window. [1]
4 of 9: After it falls, put a blue portal into any nearby wall or floor spot so that you can go through it.
5 of 9: When you emerge from the orange portal, move forward a bit and find the wall to the left with several sections missing from it. (It's to the left of the wall with the big observation window.)
6 of 9: Fire a blue portal so that it goes through the gappy wall and ends up on the wall behind it, then go through the orange portal to get there.
7 of 9: Turn right to find a camera on a nearby wall, then go up the stairs to find the third and final camera for this chamber on the wall above the top of the stairs. [3]
8 of 9: In Chamber 03, there's one camera just to the left of the big "03" sign, plus another near the orange portal. [5]
9 of 9: The last camera for this chapter is on the wall to the right of Chamber 03's exit elevator. [6]