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.
Some newer, signs for Cloned Cube in the Underground. I'm hoping to create a sort of unified theme, for more on Beta Testing logos and stuff, check out here: Icubeomyst.tumblr.com
Good progress! Now that is a sign! =3