Portal 2 Chapter 1 Test Chamber 5

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Portal 2 Chapter 1 Test Chamber 5
sp_a1_intro5.bsp Cube Momentum

Chamber number 0.pngChamber number 5.png

Test Chamber Infobox previous.png
Test Chamber Infobox next.png
Test Chamber Infobox Portal Guy.png
Chamber progress 0.pngChamber progress 5.pngChamber progress slash.pngChamber progress 1.pngChamber progress 9.png

Portal 2 Chapter 1 Test Chamber 05.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 fling enter.pngChamber icon fling exit.pngChamber icon turret hazard.pngChamber icon dirty water.pngChamber icon blades hazard.png

This is the fifth level in the game and, like the other early levels, is set within a dilapidated Test Chamber. It introduces the player to some of the basic principles behind Portal physics, namely the way in which speed and momentum can be used in combination with Portals. Panels are also introduced in this level, and are are activated through the use of Buttons. Finally, the first environmental hazard, Goo, is introduced in order to add a consequence for failure.






  • Aperture Science Enrichment Center
  • Test Chamber 05 (Dilapidated)


  • Fire a portal at the ground and pass through it in order to bypass the broken wall.
  • Place a portal beneath the Vital Apparatus Vent to the far right of the room, then press the button below the orange portal to release a Weighted Storage Cube
  • Place the newly acquired cube onto the Heavy Duty Super-Colliding Super Button to activate the panel-based staircase to the left; ascend these stairs to reach two buttons.
  • The button to the left controls an apparatus vent, the button to the right controls a large panel which will rotate 90° clockwise. Press the left button first and then place a portal on the platform below the vent. The button to the right should then be pressed as the cube is leaving the vent in order to halt the cube after it has passed through the portal.
  • Bring this cube up to the second Button in order to open the door to the Chamberlock.

Video walkthrough

Download Download demo file


Main article: Portal 2 soundtrack

Haunted Panels by Aperture Science Psychoacoustics Laboratory [1:36] | Download Download | Play icon.png Play



Challenge Mode

  • Map name: sp_a1_intro5.bsp
  • World record: 12.38 by swagatron
  • Portals: 1
  • CM (Challenge Mode) Available: Yes