Cthulhu by Gaslight takes the Call of Cthulhu roleplaying game to the fog-shrouded streets of Great Britain and beyond. Cthulhu by Gaslight is a stand-alone game, and contains the complete rules for the Call of Cthulhu roleplaying game, including character creation. You do not need a copy of the Call of Cthulhu: Keeper Rulebook or Call of Cthulhu: Starter Set to play. The Cthulhu by Gaslight: Investigators Guide can be enhanced with the Call of Cthulhu roleplaying game as well as the Pulp Cthulhu supplement, both available separately.