Saw (2004)

"Saw" takes us into the psychotic mind of a criminal genius who creates diabolical scenarios designed to teach his victims the value of life. The Jigsaw Killer, nicknamed for the jigsaw puzzle-shaped wound left on the flesh of his victims, forces his prey to commit unbearable, agonising acts in order to save themselves. Lieutenant Tapp has been put in charge of the investigation to catch the killer. The elusive ways of the Jigsaw Killer send Tapp into an obsessive rage and he finds himself ensnared in this murderous game.

Official website: http://www.sawmovie.com/