Cloned Cube is a Portal mod. It takes place after GLaDOS' fall in Portal. You assume the role of Chell's secret clone. You have to escape or else you may just be tested to death. There is one obstacle. CUBiS is trying to kill you.
Underground
(view original)
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Description
The 3rd map in the Training Center, Underground is located miles under the surface of the Earth where many beta testing concepts were initially tested.