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.
My Hammer Editor after the October 13th Update to the Source SDK that broke the Hammer Editor.
same problem here!
Sortal have this problem too.
SSDK is bloke