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.
Here's your first glimpse at the replacement to the observation room. It's a trap! Also, the turret seems to hate television and will try to shoot the TV monitor constantly. Note the video effects. It doesn't look exactly like this in-game, but there will be less glowing stuff because I need to fix the HDR.