Portal 2 Chapter 3 Test Chamber 12

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Portal 2 Chapter 3 Test Chamber 12
sp_a2_bridge_the_gap.bsp Bridge the Gap

Chamber number 1.pngChamber number 2.png

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

Portal 2 Chapter 3 Test Chamber 12.png
Chamber icon cube dispenser on.pngChamber icon cube button on.pngChamber icon cube hazard on.pngChamber icon player button.pngChamber icon water hazard on.png
Chamber icon light bridge on.pngChamber icon turret hazard.pngChamber icon bridge shield.pngChamber icon laser redirection.pngChamber icon dirty water.png

This is the twenty-first level of the game, and is set within a dilapidated Test Chamber. This level features the Hard Light Bridge, and includes Goo as its primary environmental hazard. The Test Chamber also includes a Rat Man Den. Wheatley also makes an appearance at the start of the level.





  • Complete GLaDOS' Test Shaft (Test Chamber 12)



  • Aperture Science Enrichment Center
  • Test Chamber 12 (GLaDOS)


  • Go near the panels on the floor and wait for GLaDOS to talk to the door mainframe.Then go through the door and look at the Hard Light Bridge on the left.
  • Fire a portal above it and the other on the wall in front of you and go through the portal.
  • Place the first portal on the end of the Bridge and go through the portal.
  • Press the Switch and look at the falling Weighted Storage Cube. Fire the second portal on the wall, so it blocks the falling Cubes from falling into the Goo.
  • Pick up the Storage Cube and proceed to go through the portal.
  • Put a portal on the wall facing the exit-area to get a Bridge there.
  • Place the Storage Cube on the button and go into the Chamberlock.

Video walkthrough

Download Download demo file

Easter Eggs

  • To enter Rat Man's Den, use portals to stand on the light bridge, then look up to the ceiling. There are portal panels through a hole in the ceiling, shoot a portal to those and drop in. Navigate around the air ducts to find Rat Man's den.


Main article: Portal 2 soundtrack

Ghost of Rattman by Aperture Science Psychoacoustics Laboratory [4:06] | Download Download | Play icon.png Play