Saw

Obsessed with teaching his victims the value of life, a deranged, sadistic serial killer abducts the morally wayward. Once captured, they must face impossible choices in a horrific game of survival. The victims must fight to win their lives back, or die trying...

Currently you are able to watch "Saw" streaming on Amazon Prime Video. It is also possible to buy "Saw" on Apple TV as download or rent it on Apple TV online.