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, unable to let a killer continue his tradition, creates a test for Amanda too; she ultimately fails, leading to her own death along with John, Lynn, and Jeff. Saw IV focuses on tests designed for Officer Daniel Rigg, which are supervised by Hoffman, who pretends to be a game participant.