http://www.imdb.com/title/tt1220706/

 Thrown naked into a desolate room with thirteen strangers, Tonya (Ailsa Marshall) discovers that she is the final contestant in a deadly game. Restrained by lethal electronic collars, the players must utilize hints and tools from a box marked "pieces" 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. With each dead body comes another clue, which they use to discover that one of them is the killer. The question is ... which one?

After awaking in a dark closet with a corpse, Tonya (Ailsa Marshall) opens the door to a room full of strangers. At first, it seems, their only similarities are the prison uniforms with which they've been provided and the electric-shock dog collars around their necks. But, as their time together continues, they realize they're all part of a sick & twist game involving rules by which they must all abide and a series of clues they must solve in order to, possibly, find freedom and answers. The fight begins when 'curfews' start and, one by one, the players are eliminated.

 

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