Fermat's Room (2007)

 Four mathematicians who never know each other are invited by a mysterious person to solve a big puzzle. If  they can not solve the questions directed to them in a timely and  accurate way, the room they are in will be transformed into a mire of  death. Besides, the most important problem to solve is the relationship between them and the reason that brings them here. If you think about my job of reasoning, the movie waits to be watched immediately.