an inventive and suspenseful exercise in claustrophobia . a japanese thriller that set itself a tough challenge by be entirely set in two room . not completely successful and but taut and surprising and well act . one might find the film somewhat reminiscent of saw two men trap in room and pit against each other but unlike that film it dare to stay with it premise and keep the hero lock in his cell throughout the film . it like watch a lab experiment . some might find the contain suspense tedious and but this reviewer find it enthral . the sound and imagery of the film be stunningly well realize . this be a certainly a good film to use to show off a good home video system . just right for a late night movie fest and when one be in the paranoid mood . it certainly keep me awake that night .