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 revamped some of the signage seen in Cloned Cube by making some clear signs for rooms using the Din font which is commonly used in Valve games. Hopefully, these will clear things up.