*Turn left and go behind the tube and knock over the third turret.
*Turn left and go behind the tube and knock over the third turret.
*Let go off the turret (make sure it gets knocked over).
*Let go off the turret (make sure it gets knocked over).
*Place a portal on the wall near the third turret. Place the other portal behind the panels where the third turret is. Go through the portal.
*Open a portal on the wall near the third turret. Shoot the other portal behind the panels where the third turret is. Go through the portal.
*Run to the right and follow Wheatley until a turret is revealed on the left.
*Run to the right and follow Wheatley until a turret is revealed on the left.
*Place a portal under the turret and continue following Wheatley. Enter the elevator at the end of the catwalk.
*Get rid of the turret by using a portal and continue following Wheatley. Enter the elevator at the end of the catwalk.
*Wait for the elevator to stop and go through the door.
*Wait for the elevator to stop and go through the door.
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Revision as of 22:00, 22 July 2011
“I can't get over how small you are!” This article is a stub. As such, it is not complete. You can help Portal wiki by expanding it.
Chapter 4 - Test Chamber 21
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This is the thirty-first level of the game, and the final part of Chapter 4. This level is set within a Test Chamber, and later the maintenance areas of the Aperture Science Facility. This level advances the central plot, and does not contain any significant Portal-related challenges.