
CoC · Call of Cthulhu TTRPG · Cthulhu
Call of Cthulhu
Call of Cthulhu is investigative horror set in the Cthulhu Mythos. You play as librarians, detectives, and scholars who pursue strange clues and confront things that humanity was never meant to know. The stories centre on creeping dread, clever choices, and the cost of curiosity. Death is a possibility, as is losing your grip on reality. It’s ideal if you seek mystery with substance, grounded characters, and a slow build-up. It firmly resides in cosmic horror, where knowledge is perilous and victory often means merely surviving the night.
A session resembles a sharp detective story that becomes increasingly unsettling. Your group interviews NPCs, sifts through records, explores eerie locations, and tests their resolve when the unknown emerges. Tension builds through atmosphere and roleplay, rather than endless combat. It caters to newcomers and veterans alike, small birthday gatherings, and corporate teams who enjoy solving problems collaboratively. A professional Game Master sets the desired tone, from pulp-inspired action to bleak dread, while ensuring respect for adult themes. Expect a cinematic, collaborative thriller that you’ll discuss long after.
How to play Call of Cthulhu
The core mechanic uses percentile dice. Each skill has a percentage. You roll two ten-sided dice to generate a number from 1 to 100, succeeding by rolling equal to or under your skill. More challenging tasks require better results. The Game Master calls for Sanity rolls when the unnatural intrudes. Success keeps you steady, while failure costs composure, making choices riskier. Combat is quick and dangerous, so investigation, planning, and escape are crucial. You can push some failed rolls for another attempt at greater risk, and the GM may add bonus or penalty dice when the situation helps or hinders you.
Players bring curiosity, a character concept, and a willingness to take notes and follow leads. A professional Game Master prepares locations, suspects, timelines, and handouts, and runs NPCs with nuance. In a one-shot lasting about 3 to 4 hours, expect a tightly woven mystery with clear stakes and a decisive conclusion, often with high danger. Campaigns develop slow-burn conspiracies, recurring allies and foes, and long-term consequences for body and mind. Your GM can tailor pacing, clue density, and scare level to suit your group. Learn about different GM playstyles to find what fits your taste.




Common questions
Do I need to know the rules to play Call of Cthulhu?
No. A professional Game Master will teach you the essentials in a few minutes and keep the game flowing. You roll percentile dice, compare them to your skills, and follow the clues. We can provide pre-generated investigators or assist you in creating one quickly. If you have played D&D or other RPGs, transitioning to investigation-focused play is straightforward. You bring curiosity and a willingness to take notes. The GM manages rules calls so you can concentrate on your choices and the atmosphere.
Which edition will we use, and can you run 6th edition or d20?
Most of our Game Masters run 7th Edition because it is clear, flexible, and supported by current scenarios. If you prefer 6th Edition or the d20 version, please mention it in your request. Several GMs can run older editions or convert classic modules to maintain the original feel. You can browse available Game Masters and check which editions they list on their profiles here: find a Game Master.
How deadly is it, and how does Sanity function?
Call of Cthulhu is inherently dangerous. Conflicts are quick and can be deadly, and the Sanity system monitors how exposure to the unnatural impacts your mind. Losing Sanity alters how your investigator manages, potentially resulting in short-term or lasting effects. It’s not a bloodbath unless you request it. Your GM adjusts the level of danger, provides options for retreat, and assists you in introducing a new character if necessary, ensuring that tension remains high without spoiling the enjoyment.
What distinguishes Call of Cthulhu from D&D?
In D&D, you often solve problems through combat, gaining levels, and collecting gear. In Call of Cthulhu, you investigate, interview, research, and avoid direct confrontations when possible. Skills are represented as percentages rather than classes, and improvement is gradual. Magic is uncommon, risky, and often comes at the cost of Sanity. Many scenarios conclude without a boss fight. Success might involve stopping a ritual, saving a bystander, or simply making it out alive. The tone tends to favour realism and dread over heroic fantasy.
What group size and session length are most effective?
It works well with 3 to 5 players. With two, it has a tight, careful feel. Six is manageable if everyone takes on clear roles like face, researcher, and scout. A one-shot typically runs for 3 to 4 hours, which is sufficient for a complete mystery with a conclusive ending. Campaign sessions are of a similar length, featuring threads that carry over between episodes. Our Game Masters adjust clue density, difficulty, and time pressure to ensure the story fits your time slot and level of engagement.
Is it suitable for teens, and how frightening can you make it?
Content may include violence, distress, and occult themes, so it is not suitable for children. Mature teens can participate if the group agrees and a guardian gives approval. Before the game, your GM will assess comfort levels and establish lines and veils. We can focus on suspense rather than gore, or maintain a pulpier style with fewer grim outcomes. To align the intensity and tone with your preferences, explore GM playstyles and share your preferences when booking.
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