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The Orange Box: Portal Hints
Chamber 15 with Least Portals
1 of 7: This chamber can be done with just 12 portals. (I've heard that it can be done with fewer, but I was never able to manage it.)
2 of 7: In the first room where you need to portal-fling yourself over a glass wall, you'll need to do it with just two portals.
4 of 7: To get over the next glass wall you come to, you'll need to use the standard method, which takes 3 portals. (See below if you need a reminder of how the standard method works.)
7 of 7: Once you're on the exit lift, you can enter the elevator and finish the level with a score of 12 or 14, either of which will meet the third goal level.
