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Notice the Wooden Test Cube in the suspended glass container? Fire an exit portal directly above it (on the ceiling) and then place your entrance portal right underneath the blue Repulsion Gel pool. This'll coat the Cube in gel, making it bounce around and break out.


If you can catch the bouncing Cube before it touches the ground, you’ll earn yourself the ‘Schrodinger’s Catch’ Achievement/Trophy!

Now catch the Cube and carry it under the water to clean it up. Drop it onto the red floor switch to lower the lift that’s up on the ledge behind you.

Leave the portal under the blue gel dispenser and set an exit portal on the floor just below the lift, don't forget to shift the portal's location so the blue gel coats the floor.

Now bounce up to the lift, turn around and place the exit portal on the ceiling directly above the Wooden Test Cube. The gel will coat the Cube again, causing it to bounce off the switch, raising the lift and allowing you to exit the chamber.

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Guide Information
  • Publisher
    Valve Corporation
  • Platforms,
    PC, PS3, XB 360
  • Genre
  • Guide Release
    30 June 2011
  • Last Updated
    7 December 2020
  • Guide Author

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Welcome back to Aperture Science, a world where your Companion Cube isn’t you’re only company. Take control of Chell once again in Valve’s sequel which takes you on an humorous and puzzling adventure and in our detail-packed guide we’ll show you:

  • How to solve every test chamber first time.
  • Conquer every co-op chamber with a friend.
  • Loads of High Definition screenshots and videos showing you the solutions to every single chamber.
  • High Definition strategy videos for every achievement in the game.
  • Uncover all of the hidden secrets and Easter eggs.

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