Cthulhu Dark

Cthulhu Dark is a rules‑lite horror game by Graham Walmsley that pushes dread and discovery to the forefront. With minimal mechanics and an Insight track that escalates consequences, it delivers fast, fiction‑first investigations where running, hiding, and hard choices matter more than gear lists. Ideal for intimate, high‑tension sessions.

At-a-glance

Cosmic Horror • Needs GM • 2/5 complexity • One-shot friendly • None prep

Cthulhu Dark

The tone is bleak and human: mysteries end with awful clarity rather than triumphant victory. Settings in the book range from 19th‑century London to present‑day Mumbai and near‑future urban decay, but the engine is flexible enough for small‑town disappearances, cold‑case dossiers, or found‑footage horror.

Theme and Setting

Resolution is deliberately spare. When you risk something, you roll simple dice (including an Insight die when forbidden knowledge is at stake) and read the highest.

How Play Feels

Higher results grant clearer, more authoritative outcomes, but invoking the Insight die risks ratcheting your mind open to the horror—once Insight climbs too high, you spiral. There are no build trees, skill lists, or tactical subsystems; fictional positioning and consequences do the heavy lifting.

What Makes It Distinct

You want denser mechanical crunch or build complexity You want combat and action to drive most of the session. You want denser mechanical crunch or build complexity You want combat and action to drive most of the session.

Where It May Not Fit

You want denser mechanical crunch or build complexity You want combat and action to drive most of the session.

Decision guide

What this game is about

Key facts
Players
2-5 players + GM
Session
120-180 minutes
Prep
None
Play profile
Complexity
2/5
New GM Fit
5/5
Roleplay Focus
5/5
Combat Focus
2/5
Tactical Depth
0/5
Campaign Depth
4/5
Who it suits
Best for
Tables that want solving problems and following clues to matterTables that want fiction-first play and scene-level consequencesPlayers who want character, atmosphere, or story to matter more than pure tactics
Avoid if
You want denser mechanical crunch or build complexityYou want combat and action to drive most of the sessionYou want the system to stay almost invisible at the table

A strong fit for groups that want solving problems and following clues to matter, with investigation helping define the experience.

Agent data

Structured data and an explicit decision profile JSON document are available for remote agents.

Open agent JSON