Fermat's Room (2007)

Fermat's Room is a Spanish language film (set in Spain) in the same genre of films as the Cube series. A small group of people end up stuck in a shrinking room and the only way to avoid being crushed is to answer a series of riddles.

This movie is a fine example of one of my favorite movie types; characters end up stuck somewhere not knowing who put them there or how to get out but without the gore of the Saw series. It's well acted. It's well worth watching.