The murderous Jigsaw (Tobin Bell) is back with a newer and more bizarre killing game. Another victim with the Jigsaw-like death features is discovered by the police, which brings Agent Eric Matthews (Donnie Wahlberg) back to his previous horror nightmare. But unexpectedly, the murderer left very obvious clues, and the police's investigation and evidence collection went very smoothly. In fact, all of this is under the control of Jigsaw (Tobin Bell). Leaving clues and getting himself arrested are the important prerequisites for his next evil game: 8 strangers will be forced to join the game, and what's even crazier is that another player has been identified as Matthews. Under the planning of Jigsaw, another thrilling game of life and death is about to begin...