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Nine Circles

Next to the door of the test chamber, you see a stack of flyers. The flyers say:

"DEAR TEST SUBJECT: before attempting to solve test, please read Application Note #019-A0, "Some consequences of local non-conservation of potential energy in portal field applications", or Publication AS8, "Climbing by Placing Portals (for Dummies)".

The support of the Aperture Science Directorate for Open Large Testing Spaces (D.O.L.T.S.) in the development of this chamber is gratefully acknowledged."