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the movie starts off where this girl wakes up in this building or house and finds shes not alone..there are other ppl there who dont know how they got there either. one scene is where a few of them are arguing and a girl gets pushed and hits her head on something and ends up dead. there is someone watching them thru cameras in the building. all the windows are bricked up. i think there was a cop in there with a gun. they all party and people start dying. the person watching the cameras feeds them, but each day it gets less and less. they are suppose to kill each other and the last one standing is suppose to b let out. in the end there is one girl left and she thinks shes being let out, but she gets put into another room/building to do it all over again.