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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Some screenshots of the second level of the game (cc_2), this version you see here will probably be removed in the final version of the game due to storyline changes. A slight image editing blur effect has been added but don't worry because the final game will support HDR 100% as seen in the last picture with the image drastically overexposed.