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The Orange Box: Portal Hints

Chamber 15 in Least Time

  • 1 of 10: Run-jump forward to the first room and quickly use the standard technique for flinging yourself over the glass wall.
  • 2 of 10: In the second room, quickly use the standard way to get the energy orb into its receptor.
  • 3 of 10: As soon as the lift starts to lower, fire a blue portal onto the wall of the hallway just past it, then fire an orange portal at your feet. That's a lot faster than riding the lift.
  • 4 of 10: Run-jump to the room where you need to fling yourself over the second glass wall using the regular method.
  • 5 of 10: To save time, you won't be flinging yourself over the third glass wall or activating the moving platforms. Instead, use this chamber's "least portals" method to portal your way to the final room. (Note that you'll need to move more quickly than the usual slow and cautious crouch-walking would allow, making this a dangerous and error-prone operation.)
  • 6 of 10: In the final room, you'll get onto the raised exit lift by using a method similar to the "least portals" method, but a bit faster.
  • 7 of 10: Put a blue portal on the floor next to the base of the lift, then put an orange portal on the nearest bit of concrete ceiling.
  • 8 of 10: Jump into the blue portal, then fire another orange portal at the floor directly beneath you right after you come out of the orange portal you put on the ceiling.
  • 9 of 10: That should fling you up out of the blue portal hard enough to get you onto the exit lift, provided you crouch and press a movement key to help guide you.
  • 10 of 10: As soon as you land on the lift, run-jump into the elevator to finish the challenge.