Call of Cthulhu is a tabletop roleplaying game based upon the worlds of H. P. Lovecraft. It is a game of secrets, mysteries, and horror. Playing the role of steadfast investigators, you travel to strange and dangerous places, uncover foul plots, and stand against the terrors of the Cthulhu Mythos. You encounter sanity-blasting entities, monsters, and insane cultists. Within strange and forgotten tomes of lore you discover revelations that man was not meant to know. You and your companions may very well decide the fate of the world.

Call of Cthulhu Free Basic Rules

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The Essentials

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Investigator Handbook

Whether learned professor, nosy journalist, or hard-hitting detective, investigators need all the help they can get. Let this book be your guide. The Investigator Handbook is an essential player's aid for the Call of Cthulhu roleplaying game.

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Keeper Rulebook

This book, the Keeper Rulebook, contains the core rules, background, guidance, spells, and monsters of the game. It is intended for use by the Keeper of Arcane Lore (the Keeper) — that player who will present the adventure to the other players. You must have at least one copy of this book to play Call of Cthulhu.

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Malleus Monstrorum: Cthulhu Mythos Bestiary

This book contains detailed information concerning the monstrous and frightening horrors of the Cthulhu Mythos. Drawn from the history of the Call of Cthulhu game, the entries herein present a diverse range of creatures and foul abominations to haunt and terrorize your games.

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Compendiums on Roll20

• Call of Cthulhu: Arkham
• The Grand Grimoire of Cthulhu Mythos Magic
• Harlem Unbound
• Investigator Handbook
• Keeper Rulebook
• Malleus Monstrorum: Cthulhu Mythos Bestiary
• Pulp Cthulhu

Miskatonic Repository Compendiums

• Highway of Blood
• Of Sorrow and Clay