Saw was published by IDW.

The comic book is a prequel to Saw, as well as the entire series. It tells the origin of the tortured John Kramer and his sinister alter-ego, Jigsaw. Also, it fleshes out Jigsaw's past and motivations, and answers some unexplained questions from the first film such as how he knew all his victims and how a dying old man could concoct such elaborate traps