|“I can't get over how small you are!”
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Test Chamber 19 (Advanced)
This is the sixth and final advanced Test Chamber of the game. This version is unlocked when the original Test Chamber 19 has been completed. It as the extra challenge such as Turrets and Rocket Turrets everywhere in the supervision areas, the motionless angled platform now moving, less white surfaces, the removal of the supplementary ledge, Goo almost everywhere at the last room's bottom and half of the moving platforms in the last room are not portal-conductive anymore.