Call of Cthulhu (role-playing game)

Call of Cthulhu is a horror fiction tabletop role-playing game based on H. P. Lovecraft's story of the same name and the wider Cthulhu Mythos. Chaosium publishes it and Sandy Petersen created it; it first appeared in 1981 and has reached its seventh edition, with licensed editions in other languages. Its rules grow out of Chaosium's Basic Role-Playing system, with added rules for sanity and luck, and it uses percentile dice to decide success or failure. Players take the roles of ordinary investigators, usually in a 1920s setting, who uncover paranormal mysteries and face creatures that threaten both life and sanity, while the gamemaster, called the Keeper of Arcane Lore, presents the story. Unlike many contemporary games it stresses investigation, psychological horror and character vulnerability over combat, and it is widely seen as a pioneering horror role-playing game. It is one of the longest-running tabletop role-playing games still in print.