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The Orange Box: Portal Hints
Chamber 14 in Least Time
1 of 5: As soon as the elevator doors open, run-jump ahead to the corridor intersection.
2 of 5: Fire an orange portal into the floor next to the raised lift, then turn left and fire a blue portal into the ceiling that's over the pit with the lowered stairs in it.
3 of 5: Drop through the orange portal, quickly firing a blue portal onto the floor that you're falling toward.
4 of 5: Raise your view upward before you hit the blue portal, then lean on the "Move backward" key after you shoot up out of the orange portal to make sure you land on the raised lift. (Or if you keep getting turned around for some reason, lean on the "Move forward" key instead.)
5 of 5: Quickly run-jump forward into the elevator to finish the challenge.