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.
I made a mock-up poster of a typical Aperture Science Service Announcement. Vote for how many years you want Cloned Cube to take place after the original Portal @ Docs.google.com. The font I used in the poster is called Milford and is a free alternative to Univers which they use in Portal 2 poster.