Breathing Room (2008) Trailer
Thrown naked into an isolated room with thirteen strangers, Tonya discovers that she is the final contestant in a deadly game. Restrained by lethal electronic collars, the players must use clues from a box to find both an exit and the reason for their abduction. One by one, the players are eliminated as their curfew begins and the lights go out. They are in a race to survive and discover which of them is the killer.