The Orange Box: Portal Hints

Chamber 15 with Least Steps

• 1 of 16: Use the Floor-Portal Routine to get to a spot on the floor near the glass wall in the first room.
• 2 of 16: Put an orange portal on the extended wall section near the ceiling, then put a blue portal right underneath yourself. After you come out of the orange portal, fire another blue portal at the floor (if necessary) to make sure you hit it and get flung over the glass wall.
• 3 of 16: After you land, use the floor-portal routine to get partway down the short hall that leads to the next room, then again to get into that room.
• 4 of 16: Do it one more time to get yourself next to the force field that's across the entrance to the side area with the energy orb receptor device.
• 5 of 16: Put a blue portal on the wall directly across from the receptor area, then wait for the energy orb to pop before putting an orange portal on the blackened spot on the wall where it bounces.
• 6 of 16: As soon as it goes through the portal, run-hop through the force field to enter the receptor room, then use portals to get the orb to go into the receptor.
• 7 of 16: Run-hop back through the force field, then put an orange portal on the wall above and beyond the small lift. Fire a blue portal at your feet to get into the hallway past the lift.
• 8 of 16: Use the floor-portal routine to get from where you are to a spot near the next glass wall, then turn and fire an orange portal onto the wall that you can see through the nearby "window." Put the portal as high up on the wall and as far to the left as you possibly can.
• 9 of 16: Look down at the floor and fire a blue portal at your feet, then lean on the "Move forward" key so you'll land as close to the "window" as you can get without taking extra steps. Once there, you'll need to relocate the orange portal to the extended wall section that's above the area's entry doorway.
• 10 of 16: Hopefully, you'll be able to place the orange portal by just crouching down and looking out through the window. If not, you'll have to take a couple of extra steps, or restore a save and retry the last portaling maneuver.
• 11 of 16: Once that portal is placed, run-hop over to the edge of the small pit with the concrete floor, then jump in and fire a blue portal so that you'll fall through it. As you fall toward the floor near the glass wall, use another blue portal to get yourself flung over the wall.
• 12 of 16: After you land, use the floor-portal routine to get yourself over near the left side of the doorway that leads to the moving platform hallway. You need to be standing so that you can see the hallway's back wall, and are very close to the wall that's just to the left of the doorway.
• 13 of 16: Put an orange portal onto the hallway's back wall, and a blue portal on the wall just to the left of the doorway. Hop over to the blue portal (careful not to go through it and fall into the toxic water), then use this chamber's least-portal method to get to the final room.
  • How can I get to the room past the hallway with the fewest portals?
• 14 of 16: In the final room, use the floor-portal routine to get to a spot next to the base of the raised exit lift, then fire an orange portal onto the nearest portion of concrete ceiling.
• 15 of 16: Fire a blue portal at your feet, then fire an orange portal onto the floor as you're falling so that you'll enter it and get flung up out of the blue portal with enough force to land on the exit lift (provided you crouch and press the appropriate movement key).
• 16 of 16: Run-jump to the elevator to finish the challenge.

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