Imagine if the villain of "Saw" had a master's degree in mathematics, and you'll get the gist of "Fermat's Room," a brainy and brain-bending superlative Spanish thriller.

On the surface, its simple structure bears similarity to the cult sci-fi hit "Cube," with people trapped in a room, having to solve puzzles to find their way out. In the case of "Fermat's Room," written and directed by Luis Piedrahita and Rodrigo Sope

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