How To Play Call of Cthulhu 7e: Getting Started Guide

Introduction

Call of Cthulhu 7e is a tabletop investigation and horror game. One player is the Keeper, who presents the situation, portrays the world, and adjudicates the rules. Everyone else plays an investigator: a person with a job, skills, relationships, and enough curiosity or responsibility to follow a mystery when leaving would be safer.

The rules are approachable. The play style is the real lesson. Ask questions, search for evidence, compare notes, and decide what the next lead is worth. When a threat appears, fighting can be an answer, but it is rarely the only answer and often not the best one.

This guide covers the whole beginner route in one place: what the game is, what you need, how a session and a roll work, how to run a first session, and what changes if your group is coming from D&D.

Hot Take

The first CoC rule to learn is not a dice rule. It is that the group can be cautious without becoming passive. Investigate boldly; confront danger deliberately.

New players often hear that combat is dangerous and conclude that the best plan is to avoid every unsettling room, stranger, and lead. That preserves an investigator only until the mystery advances without them. Caution works when it produces a better question, safer preparation, an ally, an escape route, or a deliberate risk. It fails when it becomes permission to stop making decisions. A proactive group turns a mystery into a shared investigation. A passive group turns it into a hallway with mood lighting.

What Is Call of Cthulhu?

Call of Cthulhu is a roleplaying game of investigation and horror. Players portray investigators who uncover strange events, human wrongdoing, forbidden knowledge, and threats connected to the Cthulhu Mythos. The Keeper runs everyone and everything outside those investigators.

The core books support classic 1920s play and the modern day, and groups use other eras too. The details change, but the core question stays familiar: what do ordinary, capable people do when the truth is dangerous and refusing to know it is not really an option?

Who Does What At The Table

The Keeper Rulebook says play is usually cooperative: there are no winners and losers in the competitive sense, and the Keeper prepares and runs the scenario without bias. The Keeper has more information than anyone else, but that does not make them the group's opponent. Their job is to show what is happening, portray how people and threats react, and make the unknown coherent enough that players can investigate it. A good mystery becomes more interesting when it resists easy answers, not when the only clue is hidden behind a failed roll.

What Play Feels Like

Most sessions begin with a disruption: someone disappears, a death makes no sense, a letter arrives from a frightened friend, a local story does not add up, or an ordinary institution has started behaving strangely. Expect libraries, crime scenes, witnesses, strange documents, suspicious organizations, and places that become less welcoming the longer you look at them.

At the table, that usually means:

• Asking an NPC what they know, and noticing what they avoid saying.
• Searching a location for facts, motives, patterns, and physical evidence.
• Researching people, places, events, books, records, and old news.
• Deciding whether to trust a witness, break a law, enter a dangerous place, or ask for help.
• Surviving the moments when the mystery stops being theoretical.

Chases, fights, travel, social scenes, and sneaking all happen. They matter because they complicate the investigation. A chase may reveal who is protecting a secret. A fight may buy time to escape with evidence. A conversation may be the most dangerous scene in the session because it decides whether the group gets invited inside.

Success also comes in several shapes. Exposing a threat, protecting one person, containing something dangerous, or escaping with enough proof to act later can all be good outcomes, even when the investigators are injured, frightened, or unable to defeat the source of the problem. Arbitrary failure is still bad refereeing. The point of the wider definition is to give the group something to weigh each risk against, instead of asking only whether it can clear the room.

Sanity Is Pressure, Not A Joke

Sanity represents the strain of confronting experiences that undermine an investigator's understanding of the world. It is part of the game's horror pressure. It is not a license to mock mental illness, force a player into a caricature, or make someone perform distress for the table's entertainment.

Use it as a prompt for consequences and choices. What does an investigator do after witnessing something they cannot explain? Do they deny it, isolate themselves, become obsessed, seek help, or double down on the investigation? The exact rules matter, but the table's treatment of the subject matters more. The Session Zero step below covers how to set boundaries before play.

Is It A Good Fit For Your Group?

Neither preference is wrong. It is a useful conversation to have before someone packs explosives for a library visit.

A First-Session Example

The Keeper tells the group that a university librarian has vanished after leaving a message about a book that should not exist. The investigators know the librarian's last known location and the name of a colleague who received the message.

The group has several reasonable leads. It can visit the library, interview the colleague, look into the book's history, or investigate the librarian's home. None of those choices requires a prescribed scene order. The Keeper responds to the choice, establishes what is at stake, and lets the consequences create the next decision.

At the library, an investigator might say: "I want to learn who accessed the restricted collection after closing. I will start with the sign-in records and then ask the night clerk whether anyone seemed frightened." That gives the Keeper an intent, a method, and a clear way to frame information or trouble. That is a Call of Cthulhu session: ordinary people, a specific question, incomplete information, and a growing reason not to look away.

What You Need

• A Keeper and investigators: the Keeper Rulebook says you only need a Keeper and one player, and that two or three players is ideal. A small group gives the table more ideas and more reasons to follow different leads.
• The Keeper Rulebook: the Keeper needs the core rules and scenario guidance. Investigators do not each need their own copy to begin, especially when the Keeper can explain a roll as it comes up.
• Percentile dice and polyhedral dice: two ten-sided dice make a d100. The rulebook also lists a d4, d6, d8, and d20, and d10 rolls turn up for Sanity loss and damage. It recommends that everyone have their own set; one shared set can get a first game going, though it will soon become the most borrowed object at the table.
• Investigator sheets, pencils, and paper: the rulebook has photocopiable 1920s and modern sheets, and Chaosium offers them as free downloads. A pencil matters because resources, injuries, and Sanity change. Paper matters because clues are easier to solve when the group can see what it knows.
• Time and a place to talk: a three- to four-hour session is a useful first target. The group needs room to discuss leads, ask questions, and occasionally stare at a name in the notes as though it has personally betrayed them.

You do not need miniatures, a battle map, costumes, accents, a deep knowledge of Lovecraft fiction, or a complete homebrew setting. Those are optional tools. The essential equipment is a prepared situation and people willing to follow it somewhere inconvenient.

How To Play Call of Cthulhu 7e

The Core Loop

1. The Keeper presents a situation. A missing person, a suspicious letter, a body, a strange dream, or a request that becomes harder to refuse once the details appear.
2. The investigators decide what matters. They interview someone, examine a room, research a name, travel somewhere, or make a plan for getting past a problem.
3. The Keeper decides whether a roll is needed. Most actions resolve from the fiction. Dice are for uncertainty and consequence.
4. The result changes the situation. The group gets information, pays a cost, attracts attention, loses time, or finds a more dangerous lead.
5. The group interprets the result and chooses the next lead. The mystery moves because players connect information and accept risks, not because they wait for the correct door to glow.

The rules support the loop, but the loop is what makes Call of Cthulhu feel different from a dungeon crawl.

Rolls Are Not The Investigation

Most skill and characteristic rolls use a d100. Roll two ten-sided dice, read one as tens and one as units, and compare the result to the relevant value on your sheet. If the roll is equal to or below the target, you succeed. A 00 on the tens die with a 0 on the units die reads as 100; 00 and 3 reads as 3. The Dice Guide walks through the physical procedure.

The Keeper sets the difficulty. There are three levels:

An investigator with 60% succeeds on 60 or lower at Regular, 30 or lower at Hard, and 12 or lower at Extreme. When an investigator acts against a living opponent, the opponent's matching skill or characteristic sets the level: under 50 is Regular, 50 or more is Hard.

The rulebook is explicit on one point new players often get wrong: there are only two outcomes, success or failure. Rolling under half or a fifth of your skill does not mean the goal is achieved to a higher standard. If the goal was "get into the archive before it closes," a very low roll gets you into the archive, not every secret in the building.

The Keeper also decides when no roll is needed. The rulebook's example is driving across town: nobody rolls Drive Auto for that. Normal everyday activity just happens. Dice come out when the story reaches a moment of tension that needs a definite outcome, such as a car full of cultists trying to force you off the road.

State An Intent Before You Name A Skill

The rulebook asks players to state a goal before rolling. A useful declaration has three parts:

Compare these declarations:

• "I roll Library Use."
• "I want to find out whether the missing professor published anything about the hill before he vanished. I will start with old local newspapers and university archives."

The second gives the Keeper something to answer. Perhaps no roll is needed because the information is available. Perhaps the roll decides speed, completeness, or whether the research attracts notice. The first gives the Keeper a number and a vague hope. Goals also shape difficulty: in the rulebook's example, "break the door down" and "lever the door open quietly" are different goals.

Nobody has to deliver a speech before opening a door. The group just needs to know what the investigator is trying to accomplish.

Failure And Pushed Rolls

A failed roll means the investigator did not achieve the stated goal, and the Keeper decides how. The rulebook says an initial failure should not usually inflict damage or Sanity loss; it can simply mean the investigator hesitated or could not act. In the rulebook's example, an investigator who fails a Climb roll to get down from an upper window stays stuck at the window rather than falling.

A player can often push a failed skill roll. This is a second and final attempt, and the player must justify it by describing extra effort, time, or risk. Pushing gives the Keeper permission to bring dire consequences if the second roll fails, so the rulebook tells Keepers to save "what's the worst that could happen?" results for pushed rolls. The Dice Guide has examples of pushes and what they put at risk.

How The Keeper Sets Stakes

Before a consequential roll, the Keeper should know what success makes possible and what trouble a poor result could introduce. The player can be left without the full scenario behind the curtain, provided they understand the immediate risk well enough to decide with their eyes open.

If failure would produce no interesting change, the Keeper can usually give the information and move on. If the information is essential, use the roll to decide speed, completeness, attention, cost, or the new danger attached to it. A clue that exists only behind one failed roll turns the mystery into a stalled evening with better stationery.

Follow Clues Without Waiting For Permission

Investigators should not wait for the Keeper to announce the next scene. The table should share discoveries: make notes visible, name suspects consistently, and say when a detail connects to an earlier scene. A player can enjoy a private theory, but the group cannot act on a clue that never reaches anyone else.

When the group is stuck, use this routine:

1. Separate facts from theories. "The body was moved" is a fact. "The caretaker did it" is a theory.
2. Name the blocking question. Who had access? Why was the victim at that location? What is the symbol connected to?
3. Choose a lead you can act on. A person, place, document, object, or event can move the question forward.
4. Say the goal out loud. Tell the Keeper what you hope the next scene will establish.
5. Decide what the lead is worth. If it is dangerous, agree what the group will spend, risk, or leave behind.
6. Accept the result and update the notes. New information, delay, cost, danger, and a changed plan are all progress.

This prevents a common new-player trap: treating a stalled investigation as a demand for the Keeper to reveal the answer. The group usually has a question it can act on. It just needs to turn its notes into a next move. Individual investigators can disagree, hide information, or pursue personal motives when everyone agrees it will be fun, but players should still help build a shared story everyone can follow.

What To Do As A Player

• Keep a usable clue record. Track names, dates, places, objects, promises, and unanswered questions. Mark which facts are confirmed and which are guesses.
• Share discoveries. Unless secrecy is an agreed character conflict, tell the other investigators what you found. A private clue is often a future misunderstanding.
• Ask about the world, not the answer key. Ask what your investigator can observe, who might know something, and what a location suggests.
• Treat costly results as new problems. A missed opportunity, an alarmed NPC, or a dangerous new lead is still material to play with.
• Say when your character takes a risk. The Keeper can then make the stakes clear before the dice land.
• Use your investigator's ordinary life. Occupation, contacts, reputation, possessions, and obligations are story tools. A librarian, doctor, journalist, police officer, or socialite each has credible ways to open different doors.

A player turn, step by step:

1. Listen to the Keeper's description and note what feels unusual.
2. Pick one question your investigator wants answered.
3. Describe the approach in ordinary language.
4. Ask clarifying questions before committing to a dangerous action.
5. Make a roll only when the Keeper calls for one.
6. Add the result to the group's understanding and decide the next lead.

You do not need an accent, a theatrical performance, or perfect system knowledge. You need curiosity and a willingness to make decisions with incomplete information.

What To Do As A Keeper

• Give every important clue more than one route into play. A person, document, location, or physical detail can all point toward the next question.
• Set consequences clearly enough to choose between: hidden facts can stay hidden, but obvious danger, urgency, and social risk should be visible.
• Cut between investigators when separate actions are both interesting. The rulebook compares this to moving a spotlight: address questions to different players, and do not let one player dictate another investigator's actions.
• Let the world react. NPCs have motives, threats have plans, and time can matter. Reaction should follow the fiction rather than punish the group for engaging with it.
• Say "yes, and" or "yes, but" where you can. The rulebook advises working players' unplanned approaches into the story, with complications, rather than steering them back with a flat no.
• Use the Idea roll when the group is stuck. Its goal is always to get the investigation back on track. The players get the missed clue whether they pass or not; the roll decides how they get it.
• Check in when horror becomes personal or intense. Safety is an ongoing table practice, not a single conversation before the campaign.

For a first scenario, prepare a situation rather than a script. Do not write a novel with a single correct ending:

1. Define what is wrong and what will worsen if no one intervenes.
2. Identify the people, locations, evidence, and motives connected to that problem.
3. Place two or three routes to each essential revelation.
4. Decide how opposition responds when investigators get close, and what delay, noise, or reckless choices cost.
5. Note a few sensory details that set the tone without a page of boxed text.
6. Begin with an event that gives the group a reason to care.
7. End the session with a decision, revelation, or danger that makes the next move clear.

The Keeper's job is not to outsmart the group. Let good plans work. Let bad plans become memorable. Let a failed roll complicate the investigation without making the only clue disappear into a locked drawer forever.

Table Pacing: When To Zoom In And Move On

Not every moment needs equal attention. Zoom in on choices, discoveries, danger, conflict, and character interaction. Move quickly through routine travel, ordinary purchases, and searches with no uncertainty or pressure.

Players can summarize ordinary actions: "We spend the afternoon checking the remaining addresses." Keepers can answer with the next meaningful development instead of asking the group to roleplay every train ticket and filing cabinet.

Common First-Session Mistakes

Quick Start Guide For Your First Session

The first session only has to teach the table how to investigate together. The campaign can establish itself later.

Session Zero: Set The Tone Before The Horror

The Keeper Rulebook tells Keepers to ask players before play whether there is anything they do not want to see, then either avoid that topic or fade to black when it comes up. Call of Cthulhu can involve violence, mental strain, cults, prejudice appropriate to historical settings, body horror, threats to children, confinement, and other material that does not belong at every table.

Ask direct questions:

• What era and location are we using?
• Is the group interested in eerie investigation, bleak cosmic horror, pulpy action, crime drama, or some mix?
• What content is off limits, faded to black, or needs a check-in before it appears?
• How will someone signal that a scene needs to change or stop?
• Why are the investigators willing to work together when the first unusual event arrives?

These are not rules obstacles. They are the group deciding what kind of story it is making. A clear safety conversation gives the Keeper more freedom to create tension because everyone knows where the boundaries are.

Build Investigators Who Follow Leads

An investigator does not need to be an occult scholar. A journalist, doctor, police officer, professor, laborer, entertainer, clerk, veteran, or dilettante can all have a reason to become involved. The useful question is not "Who would fight a monster?" It is "Who would keep asking questions after a sensible person left?"

Give your investigator three anchors:

You can discover the rest while playing. Do not demand a three-page backstory, and avoid a character who has only a tragic secret and no reason to cooperate; secrets are seasoning, not the group meal. The Character Creation guide covers the full build.

Pick The Right First-Session Scope

Plan for a complete small problem or a clear stopping point after three to four hours, not a full setting history and a dozen competing conspiracies.

The fastest way to make a first session feel like Call of Cthulhu is one ordinary fact that becomes impossible when the group looks twice, well ahead of any frightening monster: an unexplained key, a record that contradicts a witness, a familiar person who has vanished. "Something is wrong" is mood. "The missing archivist mailed you a key and an address" is a session. Start with a fact the group can test, and let the uncanny arrive after the table knows what normal looked like.

The 30-Minute Table Setup

Use this sequence before the Keeper begins the opening scene.

Minutes 0-5: name the game you are playing. The Keeper states the setting, broad tone, and premise in plain language. "Classic-era investigation with eerie occult horror" is enough. So is "a modern missing-person case that becomes increasingly unnatural." Confirm boundaries at the same time, including how anyone can pause or redirect a scene.

Minutes 5-15: introduce the investigators. Each player gives three facts:

1. Who are you in ordinary life? Occupation, social role, or expertise is enough.
2. Why does this opening problem matter to you? Duty, curiosity, a relationship, money, guilt, or reputation all work.
3. What can the group ask you for? A useful skill, contact, resource, or perspective gives the others a reason to involve you.

Example: "Dr. Elena Marsh is a physician who treated the missing archivist after a panic episode. She wants to know why he sent her a key, and the group can rely on her medical judgment when a scene turns physical."

Minutes 15-25: explain only the immediate rules.

• The Keeper describes the situation; investigators say what they do.
• Describe the goal and method before naming a skill.
• A d100 roll succeeds when it is equal to or below the target.
• The Keeper calls for rolls when uncertainty and meaningful consequences are present.
• A failed result changes the situation. It does not have to end the investigation.

Mention that Luck, pushed rolls, Sanity, combat, and chases exist, and teach each one when the scenario gives it a job to do.

Minutes 25-30: give the group a lead. Open with an event and a concrete detail: a letter, key, address, witness statement, photograph, appointment, or physical object. End the opening description with a question: "What do you do?"

A Ready-to-Use Opening Structure

This is a scenario skeleton, not a published adventure. Change the names, setting, and details to suit the group.

The Keeper should not decide which of the three first leads is correct. Prepare what each can reveal and let the investigators choose the route. The shared question keeps the scenario coherent even when the order changes.

First-Session Decision Guide

When the group faces a new lead:

1. What are we trying to learn or prevent? State the immediate objective.
2. What is the safest useful route? A phone call, public record, trusted contact, or observation may reveal more than breaking in immediately.
3. What risk are we accepting? Time, exposure, injury, reputation, resources, or attention from opposition.
4. What will we do if it goes badly? Retreat, call for help, switch leads, create a distraction, or accept a cost.
5. Who records the result? Keep facts and new questions visible to everyone.

None of this demands perfect caution. It is how investigators make deliberate decisions instead of drifting from one dangerous scene to another because the table assumes the next door must be opened.

When The Table Gets Stuck

"We do not know what to do next." List confirmed facts, then turn the most important gap into a question. Ask which person, place, record, or object could answer it. If the group has no clear option, the Keeper can summarize the available leads or call for an Idea roll rather than waiting for a lucky guess.

"We failed the roll." Ask what changed. Perhaps the group lost time, drew attention, received incomplete information, or learned that the lead is more dangerous than expected. A failed roll should create a decision, not delete the mystery.

"We are worried about a fight." That concern is useful information. Consider escape, containment, observation, negotiation, allies, preparation, or a different route. Combat can happen, but the first question is what it accomplishes for the investigation.

"The horror is too much." Pause. Change the description, fade the scene out, redirect the subject, or move on. Keeping the game enjoyable matters more than preserving a particular detail of the scenario.

First-Session Checklist

Investigators

• Know your investigator's name, occupation, key skills, and reason to care about the opening problem.
• Bring a pencil, percentile dice if you have them, and a place for shared notes: paper in the middle of the table, a document, or a simple list of facts and questions.
• Say what you are trying to learn or accomplish before calling for a skill.
• Ask practical questions before accepting a risk, then choose a lead even when the group does not know everything.
• Treat danger as information: decide whether to avoid it, investigate it, contain it, or confront it.
• Tell the table when a subject or scene needs a pause, fade-out, or change.

Keeper

• Have the Keeper Rulebook and a scenario or prepared situation that needs attention now.
• Prepare names, locations, evidence, motives, sensory details, and more than one route to each essential piece of information.
• Know what gets worse when the investigators delay or attract attention.
• Explain rules as they become relevant; do not turn the opening scene into a lecture or an exam.
• Ask players what they are trying to accomplish before naming a skill, and let rolls decide stakes, timing, or cost.
• End with a choice, a revelation, or a new lead.

End The First Session With Momentum

Do not force a complete resolution because the clock says it is the first night. A satisfying stopping point can be a revelation, a new location, a difficult choice, or the realization that a trusted person is involved.

Before everyone leaves, take five minutes to confirm:

• What facts did the group establish?
• What questions remain?
• What lead is most likely next?
• Did the tone work for everyone?
• Does anyone want a boundary, pace, or table practice adjusted before the next session?

That short conversation turns a first session into a campaign foundation instead of a one-off experiment.

Call of Cthulhu vs D&D

D&D usually frames characters as adventurers who become increasingly capable of confronting extraordinary danger. Call of Cthulhu frames investigators as capable people facing threats that can stay dangerous even when the investigators have done everything right.

Neither approach is better. They reward different habits. D&D often asks, "How do we beat this encounter?" Call of Cthulhu more often asks, "What is happening, what does it cost to stop, and is this the moment to run?" Rolling low instead of high is the easy adjustment for an experienced D&D player. The hard one is accepting that a smart retreat, a partial answer, or protecting one person can beat winning the fight.

At The Table

The table is deliberately broad. D&D has several editions and tables that use very different amounts of combat, mystery, and horror. The useful comparison is not "D&D players do this wrong." It is recognizing which default questions create momentum in each game.

What Stays The Same

Both games are cooperative conversations. A player describes an attempt, the GM describes what follows, and dice settle uncertain or risky outcomes. Bring these habits without reservation:

• Cooperate openly. Tell the group what your investigator learned, what you fear, and what lead you want to follow. A mystery stalls when essential information lives only in one player's notebook.
• Describe intent before mechanics. Say "I want to learn who paid for the funeral" before naming a social skill.
• Track the world. One person keeping a visible clue list can do more for a CoC group than a detailed tactical map.
• Talk about comfort and tone. Setting boundaries and the kind of tension the group wants is tablecraft, not a genre tax.
• Share the work. The doctor, journalist, detective, professor, and socialite should all get useful avenues of inquiry.

The Habits To Change

None of those changes requires timid play. Bravery in CoC is often choosing a dangerous lead with open eyes, rather than assuming every danger was placed there to be defeated head-on.

Combat Is A Consequence, Not A Schedule

Call of Cthulhu has full combat rules because investigators may need to fight. A desperate brawl, an armed standoff, or a chase through a dark street can be the right climax. The game does not promise that a hostile person or creature is calibrated for the group to overcome.

Before escalating, ask what violence accomplishes. Knocking out the night watchman may buy a few minutes, but it may also create evidence, attract witnesses, and destroy the group's chance to question the one person who knows the building. Firing at the thing in the cellar may make escape possible, or it may reveal that escape was the only sensible objective from the start.

When a scene turns violent:

1. State the goal. Protect someone, obtain an object, create an escape route, or stop an immediate threat?
2. Find the exit. Know where the group goes if the plan works only halfway.
3. Choose the smallest commitment that can work. A distraction, a locked door, an alibi, or a warning may beat an extended fight.
4. Accept consequences. A successful action can still cost time, safety, reputation, or a future source of information.

The Combat and Chases guide covers the rules once the group does commit.

Clues Are The Adventure

In a combat-forward game, information may tell you where the next challenge is. In CoC, information is often the challenge. A name in an old newspaper, a changed date in a family record, or an unfamiliar symbol on a shipping crate can become the next decision.

1. Record the fact, not only the conclusion. "Dr. Vane visited Innsmouth on March 3" is stronger than "Vane is suspicious."
2. Ask what question that fact raises. Who paid for the trip? Why hide the date?
3. Identify at least two ways to learn more: the archive, the clerk, the dock records, or the symbol.
4. Tell the Keeper what you are trying to establish.
5. Reassess when the answer creates a new problem.

You are not waiting for the Keeper to announce the next objective. You are building a case from incomplete evidence.

What Progression Feels Like

D&D makes advancement highly visible: a new level changes what a character can survive. In Call of Cthulhu, development is grounded. At the end of a scenario or campaign chapter, the Keeper calls an investigator development phase, and each skill checked for a success in play gets one chance to improve, no matter how many times it succeeded. A campaign can also give a character better connections or hard-earned knowledge. The investigator is still a human being in a setting that does not become harmless because they survived several cases.

Notice what your investigator has learned to do: recognize a pattern that would have fooled them before, call on a contact earned through play, or keep functioning in a situation that once would have overwhelmed them. Progress is real. It just does not turn the Mythos into a fair opponent. Build for a life, not an optimized combat rotation.

One Opening Scene, Two Mindsets

A missing professor was researching an old coastal family, and the group needs to know why. The records are in a sealed university archive room.

A heroic-fantasy reflex: The locked door is the obstacle. Find the strongest way through, deal with whoever guards it, then search the room for the reward.

A CoC investigation approach: The locked door is only one route. Who has a key? Who signed the access log? What records can be requested openly? Is the professor's assistant frightened, bribable, or already missing? What would prove the family connection if the room has been cleared out?

The second approach may still end with a break-in. It is stronger because the group has a reason for that choice, a plan for the consequences, and other clues if the room turns out to be empty.

Advice For Players Moving From D&D

• Be specific about your investigation. "I search the room" is a start. "I look for correspondence from the week before the disappearance, especially anything connected to the coastal family" gives the Keeper a purpose and focus.
• Make theories out loud. "I think the professor found a link between the family and the warehouse. Can we check whether the shipping company appears in both?" A wrong theory still narrows the investigation. A silent one cannot help.
• Treat retreat as a decision. Retreat can mean researching, returning with the right person, warning someone, or surviving long enough to act on what you found. A good retreat produces the next scene.
• Let your investigator be afraid. Play fear honestly without derailing the group: "I cannot go down there alone. I will hold the light while you check the stairs."
• Keep a working clue list. Separate confirmed facts, open questions, people, locations, and deadlines. End each session by naming the two most urgent leads.

Advice For Keepers Welcoming D&D Players

Do not make players guess that the genre has changed. Explain it before play: combat is dangerous, investigators are expected to pursue leads, and an honest retreat can be a smart tactical choice. Then support those expectations in the first scenario with a clear disturbance, a reason to care, and a few visible directions such as a witness, a document, and a location.

When players pursue a reasonable idea, answer the attempt. The answer may be a setback or a new danger, but it should create information or a meaningful choice. Repeatedly making investigative attempts yield nothing teaches players to stop investigating.

Signal danger in the fiction before it becomes a surprise punishment. An abandoned house can have impossible sounds, a missing caretaker, strange odors, and an unnerving lack of animal life. Those details do not reveal the answer. They let players decide whether to proceed, prepare, or leave with their eyes open.

Which Game Fits Tonight?

Choose D&D when the group wants escalating heroic capability and the pleasure of becoming able to face larger threats. Choose Call of Cthulhu when the group wants a mystery shaped by inference, ordinary people confronting the unknown, and the tension of deciding what knowledge is worth its cost.

Many groups enjoy both. Set expectations before character creation. A player expecting a power fantasy may be disappointed by unavoidable vulnerability, and a player expecting a paced mystery may be disappointed if the group treats every lead as a room to clear.

Choose Your First Route

Trying to read everything before the first session is a reliable way to make a small rules system feel much larger than it is. Use the path that matches the question in front of you.

Where To Go Next

Read the Dice Guide for the full d100 procedure and pushed-roll examples, then the Character Creation guide to build your investigator. Return to the Call of Cthulhu 7e Guide Hub for the published library and to Call of Cthulhu 7e Guides for the system directory.