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.
"All things must pass" -George Harrison
The Aperture Science Beta Testing Center is an object of Aperture's past. With new technologies being invented and tested almost every day, it was a hub of science. Until the regulators and inspectors came, claiming of Asbestos and Insecure Structures and forcing the honest employees and scientists to shut their own tests down. It was never the same and as much as the hopes of rebuilding and starting anew sounded promising, they never happened. Instead they left the massive building to rot within its shaft. Forgotten until the faithful day a new clone by the name of Chell accidently stumbled upon it.
Music: Freemusicarchive.org
YouTube: Youtube.com
Beautiful!