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.
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Just some pictures of the new train station area in Cloned Cube, you won't actually be able to go to the station but you'll get a view.