31 is a 2016 American horror film written and directed by Rob Zombie, and starring an ensemble cast featuring Sheri Moon Zombie, Jeff Daniel Phillips, Lawrence Hilton-Jacobs, Meg Foster, Richard Brake, Malcolm McDowell, E.G. Daily, Judy Geeson, and Jane Carr.
A period piece set in 1976, the film is about five carnies who are kidnapped by a gang of clowns called "The Heads" and forced to play a survival game called "31", where they are chased by the clowns through a maze of rooms over 12 hours, the penalty for capture being torture and murder, while bets are placed on their progress.
The film was crowdfunded online twice at fanbacked.com. At a test screening, Zombie compared 31 to his 2005 film The Devil's Rejects.