Portal 2 Chapter 8 Test Chamber 3

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Portal 2 Chapter 8 Test Chamber 3
sp_a4_tb_wall_button.bsp Wall Button

Chamber number 0.pngChamber number 3.png

Test Chamber Infobox previous.png
Test Chamber Infobox next.png
Test Chamber Infobox Portal Guy.png
Chamber progress 0.pngChamber progress 3.pngChamber progress slash.pngChamber progress 1.pngChamber progress 9.png

Portal 2 Chapter 8 Test Chamber 03.png
Chamber icon cube dispenser on.pngChamber icon cube button on.pngChamber icon cube hazard on.pngChamber icon player button.pngChamber icon water hazard.png
Chamber icon excursion funnel on.pngChamber icon faith plate on.pngChamber icon dirty water.pngChamber icon blades hazard.pngChamber icon crusher hazard.png

This is the forty-ninth level of the game, and takes place within an incomplete Aperture Science Test Chamber. This level features the Aerial Faith Plate and the Excursion Funnel as its primary mechanics.




  • Deadly Pits



  • Test Chamber 03 (Wheatley)


  • Go through Wheatley's Test Track.


  • Wait for Wheatley to build the rest of the chamber and turn on the Excursion Funnel.
  • Fire the portal on the wall at the end of the Funnel. Place the other portal on the wall opposite of the other test chamber. Go in the Funnel and you should get to the other side of the test chamber, where you can use the Switch.
  • Shoot the portal on the wall on the left, below the cube dispenser. Now the Funnel should be flowing under the dispenser.
  • Push the Switch and wait for the Frankenturret to reach the wall. Shoot a portal on the panels on the opposite side to get the Frankenturret to the area where you are.
  • Put the portal on the wall near the bullseye, so the Funnel goes just in front of it.
  • Use the Aerial Faith Plate to go in to the Funnel and then leave the Funnel by going on the floor on the left.
  • Leave the Frankenturret on the floor and fire a portal on the wall where you can go through and the other portal above the platform.
  • Place the Frankenturret on the black tiles going from the exit to the bottomless area. Frankenturret should be facing the bottomless area.
  • Go through the portal and fire a portal at the end of the Funnel and in front of the Frankenturret.
  • Wait for the Frankenturret to go in the Funnel and then wait for it to reach the ceiling.
  • Place the same portal on the lowest point of the wall facing the button.
  • Wait for the Frankenturret to push the button and then go in the Chamberlock.

Video walkthrough

Download Download demo file

Related achievements

Smash TV
Smash TV
Break 11 test chamber monitors


Main article: Portal 2 soundtrack

TEST by Aperture Science Psychoacoustics Laboratory [6:14] | Download Download | Play icon.png Play
Excursion Funnel by Aperture Science Psychoacoustics Laboratory [4:32] | Download Download | Play icon.png Play