Portal 2 Chapter 4 Test Chamber 21 (Escape)

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Portal 2 Chapter 4 Test Chamber 21
sp_a2_bts1.bsp Jail Break

Chamber number 2.pngChamber number 1.png

Test Chamber Infobox previous.png
Test Chamber Infobox next disabled.png
Test Chamber Infobox Portal Guy.png
Chamber progress 2.pngChamber progress 1.pngChamber progress slash.pngChamber progress 2.pngChamber progress 2.png

Portal 2 Chapter 4 Test Chamber 21.png
Chamber icon light bridge on.pngChamber icon cube dispenser on.pngChamber icon cube button on.pngChamber icon cube hazard on.pngChamber icon laser sensor.png
Chamber icon laser redirection.pngChamber icon turret hazard.pngChamber icon laser hazard.pngChamber icon water hazard on.pngChamber icon dirty water.png

This is the thirtieth level of the game, and the final part of Chapter 4. This level is set within a Test Chamber and the maintenance areas of the Aperture Science facility. This level advances the central plot, and does not contain any significant Portal-related challenges.

Portal 2 Chapter 4 Test Chamber 22
sp_a2_bts2.bsp Escape

Chamber number 2.pngChamber number 2.png

Test Chamber Infobox previous disabled.png
Test Chamber Infobox next.png
Test Chamber Infobox Portal Guy.png
Chamber progress 2.pngChamber progress 2.pngChamber progress slash.pngChamber progress 2.pngChamber progress 2.png

Portal 2 Chapter 4 Escape.png
Chamber icon cube dispenser.pngChamber icon cube button.pngChamber icon cube hazard.pngChamber icon player button.pngChamber icon water hazard.png
Chamber icon fling enter.pngChamber icon fling exit.pngChamber icon turret hazard on.pngChamber icon dirty water.pngChamber icon crusher hazard on.png





  • Escape GLaDOS' Test Shaft (Test Chamber 21)



Intended Chamber Solution

  • Place a portal on the wall where the Hard Light Bridge ends and the other one on the left side of the exit.
  • Go through the portal and push the Switch.
  • Continue to walk to the cube.
  • Put the cube on the button.
  • Use the portal again to proceed to the chamber lock.

Actual Course of Action

Escaping (Part 1)

  • Wait for Wheatley to open the wall and run to the Maintenance area.
  • Run to the left and continue forwards.
  • Turn right on just before the catwalk ends.
  • Turn left and jump down. Continue by to the right up the stairs.
  • Run forward as much as you can. Turn left and continue running.
  • Jump down on the left side.
  • Use the Bridge and run away from the Chamber until the Bridge disappears.
  • Turn to the opposite direction and continue running.

Escaping (Part 2)

  • Jump from the catwalk to the area between chambers and run forward until you get to the wall.
  • Pick up the turret and knock over the turret behind it.
  • Turn left and go behind the tube and knock over the third turret.
  • Let go off the turret (make sure it gets knocked over).
  • 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.

Sector Destruction

  • 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.

Video walkthrough

Download demo files: Download Part 1Download Part 2

Related achievements

Make a break for it
Good Listener
Good Listener
Take GLaDOS' escape advice


  • If you take too long to escape the test chamber, GLaDOS will fill the room with neurotoxin.
  • If you fall for GLaDOS's attempt to trick you back into testing, she traps you and fills the room with neurotoxin.
  • The music was remixed by the game Portal Roleplay: Remastered.


An Accent Beyond by Aperture Science Psychoacoustics Laboratory [2:58] | Download Download | Play icon.png Play



GLaDOS: I've got a surprise for you after this next test. Not a fake, tragic surprise like last time.
GLaDOS: A REAL suprise, with tragic consequences... ...and REAL confetti this time. The good stuff.
GLaDOS: Our last bag. Part of me's going to miss it - but at the end of the day - it was just taking up space.
GLaDOS: What's going on?
GLaDOS: Who turned off the lights?
Wheatley: Hey, buddy!
Wheatley: I'm speaking in an accent that is beyond her range of hearin'!
Wheatley: I know I'm early, but we have---
GLaDOS: Look, metal ball - I CAN hear you.
Wheatley: Run, I don't need to do the voice. RUN...
Wheatley: RUN!!!
Wheatley: Come on, come on!
Wheatley: Run! Come on - I'm closing the doors!
Wheatley: Run! Come on - I'm closing the doors!