Portal 2 Chapter 3 Test Chamber 16

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Portal 2 Chapter 3 Test Chamber 16
sp_a2_laser_vs_turret.bsp Laser vs. Turret

Chamber number 1.pngChamber number 6.png

Test Chamber Infobox previous.png
Test Chamber Infobox next.png
Test Chamber Infobox Portal Guy.png
Chamber progress 1.pngChamber progress 6.pngChamber progress slash.pngChamber progress 2.pngChamber progress 2.png

Portal 2 Chapter 3 Test Chamber 16.png
Chamber icon cube dispenser.pngChamber icon cube button on.pngChamber icon cube hazard.pngChamber icon player button on.pngChamber icon water hazard.png
Chamber icon laser redirection on.pngChamber icon laser sensor on.pngChamber icon turret hazard on.pngChamber icon laser hazard on.pngChamber icon dirty water.png

This is the twenty-fifth level of the game, and is set within a dilapidated Test Chamber. This level requires the player to use the Thermal Discouragement Beam in order to deal with multiple Turrets, by destroying them with the Discouragement Beam. This level also contains a Rat Man Den.





  • Complete GLaDOS' Test Shaft (Test Chamber 16)



  • Aperture Science Enrichment Center
  • Test Chamber 16 (GLaDOS)


  • Go stand on the button and shoot a portal at the end of the Thermal Discouragement Beam.
  • Get off the button to shoot the second portal in front of the Turrets in a row.
  • Stand on the button until all of the turrets are destroyed.
  • Go and get the Weighted Storage Cube from behind the glass and place it on the button.
  • Jump over the Beam coming from the portal and pick up the Discouragement Redirection Cube.
  • Aim the Beam to set fire on the rest of the Turrets. Then aim the Beam at the receptacle.
  • Go in the Chamberlock.

Video walkthrough

Download Download demo file


Main article: Portal 2 soundtrack

Turret Wife Serenade by Aperture Science Psychoacoustics Laboratory [1:38] | Download Download | Play icon.png Play


Easter Eggs

  • If the player destroys the Turret sitting behind the grating as they enter, using the Thermal Discouragement Beam, they can find an alcove behind from which they can observe 4 Turrets and the Prima Donna Turret practising Turret Wife Serenade.