John, unwilling to allow a murderer to continue his legacy, designs a test for Amanda as well; she ultimately fails, resulting in the deaths of herself, John, Lynn, and Jeff. Saw IV, meanwhile, revolves around tests meant for Officer Daniel Rigg, which are overseen by Hoffman, who masquerades as a participant in the game.
John, unwilling to let a killer continue his tradition, creates a test for Amanda as well; she ultimately fails, resulting in the deaths of herself and others. Saw IV centers around tests meant for Officer Daniel Rigg, which are overseen by Hoffman, who assumes the role of a participant.