independent film   beating   kidnapping   urination   falling from height   lifting someone into the air   severed leg   gore   nihilism   existentialism   tragedy   blood on shirt   mathematics   claustrophobia   alternative reality   stranger   imprisonment   acid   locked in a room   puzzle   bleeding to death   black cop   allegory   autism   first of series   booby trap   sole survivor   room   crushed to death   maze   labyrinth   irony   cut into pieces   escape artist   wrongful imprisonment   single set production   knifing   red light   melting face   unsolved mystery   boots   trapped in a room   leg ripped off   autistic savant   lone survivor   prime numbers   factors   huis clos   killed by a policeman   reference to big brother   reference to george orwell's 1984   slamming a door   lifting female in air   cult favorite   death   escape   murder   paranoia   danger   one word title   severed arm   stabbed in the chest   severed head   police officer killed   trap   surprise ending   title spoken by character   stabbed in the back   surrealism   survival   police   low budget film   survival horror