Death Bell

Students at an elite high school are held captive and forced into a series of sadistic games. They are picked off one by one and held in impenetrable traps where they must rely on the amazing intellects of their classmates to be released.

Death Bell is a 2008 horror thriller movie directed by Hong-Seung Yoon, starring Kim Bum, Hahm Eun-jung, Lee Beom-su. It holds an IMDb rating of 5.5/10 from 3,448 votes and runs 1h 28m.