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Portal 2 Chapter 2 Test Chamber 6
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This is the fifteenth level of the game, and takes place within a dilapidated Test Chamber. This level introduces the player to advanced manoeuvres using Aerial Faith Plate, particularly the way in which the momentum provided by the Faith Plate can be used in conjunction with Portals in order to allow the player to gain access to areas that would otherwise be beyond reach. The Test Chamber also features one of Doug Rattman's dens.
When the Cube arrives, place it on the Button by placing a portal above the Button, and then dropping the Cube through the portal.
The exit door will now open, proceed into the Chamberlock.
It is also possible to solve the chamber by activating the button with an Edgeless Safety Cube that GLaDOS drops as part of the garbage pile. But this can only be achieved once and the original solution is more recommended. Additionally, another method of solving the puzzle is to place an exit portal on the far wall to the right of the Heavy Duty Super-Colliding Super Button (the same wall that the entrance door is on), and the cube will land on the button if the portal is placed correctly. This will also grant the "Drop Box" achievement.