With Tobin Bell's John Kramer revived for Saw X, the prequel movie proves to be one of the most brutal entries in the entire franchise. This chapter takes fans back between Saw and Saw II, with Jigsaw deciding to maim, torture and reform people who tricked him into paying for a cancer cure. It's quite personal, with Kramer needing help given the scope of this crusade fans never knew existed.
Source:https://www.cbr.com/saw-x-biggest-unanswered-questions/