4 mathematicians are invited to solve an enigma. 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.

Ratings: IMDB: 6.7/10
Released: November 16, 2007
Runtime: 89 min
Genres: Thriller Mystery
Countries: Spain
Companies: Notro Films Bocaboca Producciones Generalitat de Catalunya - Institut Català de les Indústries Culturals (ICIC) BocaBoca Producciones Notro Films
Cast: Lluís Homar Alejo Sauras Santi Millán Elena Ballesteros
Crew: Luis Piedrahita Rodrigo Sopeña

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