Skullduggery (also known as Warlock and Blood Puzzle) is a 1983 Canadian horror film directed by Ota Richter. The plot depicts the devil using a role-playing game to transform a young man into a serial killer.

Plot

A group of young adults working at a costume rental store also collaborate on a fantasy role-playing game. One of the players, a young man named Adam (Thom Haverstock), is the descendant of a long line of men who are all cursed by the devil. While working at the community college theater performance a strange magician appears and puts a curse on Adam, forcing him to remember the fate of his ancestors and to make him believe that he really is a warlock.