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This Test Chamber is the third level of the game, and grants the player the ability to use the single-portal version of the Handheld Portal Device, allowing them to create blue portals of their own.
Test Chamber 02
testchmb_a_01.bsp
Hazards
None
Walkthrough
Proceed through the door, down the steps and position yourself by the window.
Wait for the Portal Device to fire a portal at the nearby wall and walk through the portal.
Jump down into the pit and acquire the Handeld Portal Device from the center pedestal.
Fire a portal onto a nearby wall and walk through it. Once through, proceed to the Chamberlock.