Fermat's Room

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.

Fermat's Room is a 2007 mystery thriller movie, starring Elena Ballesteros, Lluís Homar, Santi Millán. It holds an IMDb rating of 6.6/10 from 23,944 votes and runs 1h 29m.