The Cthulhu Hack

The core rules, containing: an overview and explanation of the base game mechanics, Saves and Resources; character creation - both archetype and flexible - allowing you to tailor the player experience; rules for threats, investigation and sanity; the Mythos, creatures and spells; an example of play and a short investigation, Save Innsmouth: Chapter 0.

The Haunter of the Dark

A guide to using Lovecraft's stories, and tales like them, as the basis for your investigations. The back of the book contains an annotated version of the titular story, with notes on where you can mine for game elements. The beginning of the book uses these elements and a standard framework to present a sequel to the Haunter, to challenge your own investigators.

From Unformed Realms

A store of random horrors, providing a springboard to your own creations or a simple mechanism for refreshing staid old adversaries. Dozens of carefully crafted tables enable the Gamemaster to use these system-free tables to generate strange new horrors to scare and challenge your player characters, who will face the unknown time and again with this toolset.

Three Faces of the Wendigo

Three authors. Three chilling tales of malevolence and inhuman appetite. Taking the myth of the Wendigo as the core focus for each investigation, these three award-winning adventures span two centuries.

• Wolves in the Mountains, written by Richard August
• Lovely, Dark and Deep, written by John Almack
• Tainted Meat, written by Paul Baldowski

Mother's Love

Mother's Love presents three investigations within the setting of H P Lovecraft's Mythos, written for The Cthulhu Hack, set in the late 20th and early 21st Century.

• Deep Roots, written by Chloé Germaine Buckley and Jonathan Buckley
• Ggantija, written by Keris McDonald
• Gift of the Flesh, written by Kathryn Jenkins

The Dark Brood

The Dark Brood offers a selection of content bringing the fecundity of Shub-Niggurath front and centre to your game and loosing her mindless progeny upon the world. Including notes on the Black Goat of a Thousand Young and the faithful who seek to harness some aspect of its power, along with new horrors, spells, dozens of ideas on adding the influence of the Dark Brood and Shub-Niggurath into your investigations, and three adventure seeds.

Valkyrie Nine

Valkyrie Nine (is a one-shot investigation, written for The Cthulhu Hack but playable with any system geared toward Lovecraftian horror. Set 100 years into the future, You're maintenance and repair units. You've activated to find power failing and no network connectivity except for short range buzz shots to other local units. Stabilize. Restore. Report. While you need the for Core Book to handle the baseline mechanics, the investigation includes five pre-generated character archetypes with modified rules for playing as automated drone units.

Save Innsmouth

You’re all students at Arkham’s renowned Miskatonic University. Between terms, you’re taking the opportunity to go hiking. You’ve taken an interest in the newspaper and local TV reports of construction in the north-east, along the coast, that will see a piece of history, a town preserved since Prohibition times, bulldozed to make way for a luxury health spa resort. This will be the last chance to see the place intact before The Man clears away another chunk of America’s heritage in the name of progress. Adventure also included in Core Book.

Thro' Centuries Fixed

You wake groggy; your body stiff, your sight obscured. You stir; vigour oozing slowly back into your muscles like you've slept for an age. As your vision clears, you find your surroundings unfamiliar, the colours and light queer. You struggle to call out for help, but cannot find the words. You struggle to remember much of anything. A standalone adventure that starts from a blank slate and could end with the doom of the world...

Forgotten Duty

A visit to the University of Navarra—located in Pamplona, Spain—in search of a rare book—the chronicles of a monk who claimed to have witnessed visions of other worlds—leads to a grim investigation.

The investigation includes five pre-generated investigators. Developed and playtested with the support of Patreon.

Island of Ignorance

A guide to using an existing setting, that of 19th century penal colony Australia, with The Cthulhu Hack. Cthulhu Reborn published Convicts & Cthulhu as a setting and I enjoyed reading it - there's something horrifying about taking a ghastly situation and then layering on the presence of the Mythos.

De Cultis Ineffabilibus

The possibility of a book with optional rules and ideas surfaced very early on, in the latter half of 2016. In many respects elements that would have made up the content of the guide have crept into the Core as Optional rules. However, many ideas remain to be revealed in this dread tome, including extra options hovering in playtest, mechanics for additional creatures, magic, tomes, combat and more - with some material lingering half-formed as marginalia and scattered notes.