4 mathematicians are invited to solve an enigma. At the house, they are trapped in a room.

In this psychological thriller, 4 mathematicians are imprisoned in a shrinking room; with the walls closing in, they must try anything to escape this fatal puzzle. Get unlimited DVD Movies & TV Shows delivered to your door with no late fees, ever. Rent Fermat's Room (2007) starring Santi Millán and Alejo Sauras on DVD and Blu-ray.

They must solve puzzles given by the host, …
La Habitación de Fermat (Fermat's Room) Critics Consensus.

Directed by Luis Piedrahita, Rodrigo Sopeña.

Fermat's Room (Spanish: La habitación de Fermat) is a 2007 Spanish thriller film directed by Luis Piedrahita and Rodrigo Sopeña.Three mathematicians and one inventor are invited to a house under the premise of solving a great enigma, and told to use pseudonyms based on famous historical mathematicians. Fast, free delivery.

This stylish yet disappointingly predictable Spanish thriller is never as exciting or ingenious as it hopes to be. With Alejo Sauras, Elena Ballesteros, Lluís Homar, Santi Millán. One month free trial!
Once there, they're locked in a mechanically shrinking room and given 1 minute to solve each puzzle via cellphone while also figuring out why they're there.