How to Write Your Own Murder Mystery Game

Quick answer: To write your own murder mystery game, start with the solution: write what really happened, minute by minute, from the killer's point of view, then turn every action into a piece of evidence. Build four to six suspects with motives and unrelated secrets, design one key contradiction that a record proves, plant fair red herrings, and test the whole thing on someone who doesn't know the answer.

A scenario: You promised your friends a homemade mystery for Saturday. By Wednesday you have a stylish opening scene, a victim with a dramatic name, and no idea who did it. So you bin the opening and write one plain paragraph: who killed whom, how, and when. By Thursday that paragraph has become a door log, two statements and a text message. The game wrote itself backwards.

Most first-time mystery writers start at the beginning: a party, a scream, a body in the library. Around page three they stall, because they don't know who did it or how the players will find out.

Mystery writers learned long ago to work backwards: write the crime first, from the killer's side, then work out what traces it would leave. The game is those traces, handed over in the right order.

We write case files at Forgotten Mystery, both online cases and printable cold case files, and this is the process we use. It holds for a dinner party game, a tabletop scenario or a digital case.

Step 1: Write the true story nobody will read

On a blank page, write in plain sentences what really happened. Not the mystery, the crime. Who, why, how, and exactly when.

At 9:10 p.m., Laura left the book club early, saying she had a migraine. She drove to her business partner's office, where he was working late. They argued about the missing money. She struck him and left at 9:35 through the loading dock. She got home at 9:55 and texted a friend, "Finally in bed, head is killing me."

This is your "true timeline." Keep it private. Every later clue must agree with it, and every suspect's lie must contradict it somewhere.

Answer these before moving on:

• What did the killer do in the hour before and after?
• What did they touch, buy, say, or send?
• What did they plan to look like, and where did the plan fail?

The last one matters most. A mystery is solvable only because the killer slipped. Decide where, now.

Step 2: Build the suspect pool around the victim

Suspects grow out of the victim's life. Sketch the victim first: job, money, relationships, secrets. Then pick four to six people who stand to gain or lose from the death.

Give every suspect three things:

1. A motive that sounds plausible out loud.
2. A secret unrelated to the murder that makes them act guilty anyway. Your cheapest source of red herrings.
3. A claimed timeline for the critical window.

Innocent suspects' timelines should be true, though they may omit things to protect a secret. The culprit's should be false in exactly one checkable place.

Step 3: Turn the crime into evidence

Return to your true timeline and ask of each line: what record would this leave? Here the game gets its texture.

• "Left the book club at 9:10" becomes a statement from the book club host.
• "Drove to the office" becomes a parking garage camera timestamp.
• "Left through the loading dock" becomes a door alarm log.
• "Texted a friend at 9:55" becomes a phone record, and a neat trap: she claims she went straight home at 9:10, but her own message places her home an hour later than a short drive would take.

Most of this evidence is neutral alone. The solution appears only when players set two pieces side by side.

Step 4: Design the key contradiction

Every good mystery has one moment when the player says, "Wait, that can't be right." Build yours deliberately.

The most reliable structure we know:

• Two witnesses who independently confirm the same fact (for example, that the office lights were on at 9:20).
• A denial from the culprit that conflicts with that fact or with a record ("I was never near the office that night").
• A record that breaks the tie: the camera, the receipt, the phone log.

Two witnesses make the fact trustworthy. The record makes the lie undeniable. Players feel clever, and nobody can call the answer unfair.

Step 5: Plant red herrings that play fair

A red herring is a clue that points the wrong way for an honest reason. The worst are random. The best carry an innocent explanation players can eventually uncover.

Where fair red herrings come from:

• Suspects' unrelated secrets. The accountant who's nervous because he's having an affair, not because he's a killer.
• Loud motives. The person who openly hated the victim. Players suspect them for being obvious; your evidence should quietly clear them.
• Misread objects. A bloodless glove that turns out to be from gardening. A receipt for rat poison, from a restaurant owner with a real rat problem.

Rule of thumb: one strong red herring per case, maybe two minor ones. Beyond that, players stop trusting any clue.

Step 6: Check the fairness rules

Golden Age writers took fairness seriously. In 1929 Ronald Knox published his famous "Ten Commandments" of detective fiction, half-joking rules like "no more than one secret room or passage" and "the detective must not himself commit the crime." You don't need all ten, but a modern checklist helps:

• Every fact needed to solve the case is in the evidence.
• The culprit appears early. No last-minute strangers.
• No twins, no secret poisons unknown to science, no coincidences that do the solving.
• There is exactly one person who fits motive, means, and opportunity and is caught in a lie.

Amateur writers miss the last point most often. For each suspect, ask: could the evidence also convict this person? If the answer is "sort of," add a clue that clears them.

Step 7: Decide the reveal order

Now arrange the evidence into rounds or document order. The shape that works:

1. Open with context. The report, the scene, who everyone is.
2. Then statements. Let every suspect tell their story before evidence contradicts anyone.
3. Then records. Cameras, logs, receipts, phone data.
4. Save the tie-breaker for last, or at least not first.

In a party game, this maps onto rounds. In a case file, it's the order of the folder. In several of our printable cold cases we go one step further and split the reveal into sealed envelopes: the case asks three questions that build on each other, the first two envelopes confirm the players' reasoning and add new evidence, and the last one holds the full solution. Other cases keep it simpler with a separate solution file. A group on the wrong track then finds out halfway, not at the end. Our printable murder mystery guide shows how to lay this out as cards and sheets.

Step 8: Test it on someone who isn't you

You cannot judge your own mystery. You know the answer, so every clue looks obvious. Hand it to a friend and watch in silence. Note three things:

• Where they got stuck for more than ten minutes.
• Which clue they thought was important but wasn't.
• Whether they could explain why the culprit is guilty, beyond naming them.

If they guess right for the wrong reason, your key contradiction isn't sharp enough. If they can't solve it, you probably buried a clue or left a second suspect uncleared.

Turning your mystery into a party game: characters and rounds

To turn a written mystery into a murder mystery party, split the evidence into rounds and hand each piece to a character instead of printing it as a document, so guests must talk to assemble the case. The crime, suspects and contradiction stay the same; only the delivery changes.

Write each character in three layers

Every character booklet needs a public layer, a secret layer and a goal layer.

• Public: who they are, why they are at the event, and one opinion about the victim anyone may hear. Two short paragraphs.
• Secret: something they hide that is not the murder. An affair, a debt, a padded resume, a stolen recipe. This makes innocent guests act guilty.
• Goals: two or three things they want tonight, like getting another guest to admit something or keeping their own secret until the vote. Goals keep guests talking even when they have no idea who the killer is.

Only the killer's booklet says what really happened, and it tells them exactly which line of their timeline to lie about.

Deal the clues across the rounds

Plan three rounds and decide which clue goes to which character in which round. One rule: no single character should hold two clues that together solve the case. Split the key contradiction across at least two people, so it surfaces only when they compare notes. Put the strongest red herring in round one, when everyone is hungry for a lead, and the alibi-breaking clue in round three, so the case cannot close early.

Write the host's script last

The host needs a short narration to open each round, a list of evidence to release, and the solution, written as a story to read aloud in about five minutes. Write it after the characters, because only then do you know what the room will already have found.

A one-page murder mystery template

Before writing a single booklet, fill in this page. If any line is blank, the game is not ready.

Line	What to write	Example
Victim	Name, role, why five people had a reason to dislike them	A hotel owner about to sell the building
Place and time window	One location, a window of 30 to 90 minutes	The hotel bar, 10:30 to 11:45 pm
Method	How the victim died, in one sentence	Poison in a nightcap carried up by room service
Killer and motive	Who and why, in one sentence	The night manager, who would lose his job in the sale
The lie	The exact claim the killer makes that is false	"I never left the front desk after ten."
The proof	The record that breaks the lie	The lift log shows his key card at 11:12
Red herring	A suspicious clue with an innocent answer	A guest bought rat poison that afternoon, for the garden shed
Suspects' secrets	One non-murder secret each	An affair, a gambling debt, a forged reference

The example above is made up for this guide and is not from any of our cases.

What makes a good murder mystery

A good murder mystery is one where, at the reveal, every player can point to the clue they should have noticed. That feeling outweighs surprise. It comes from four qualities you can check before anyone plays:

• Every suspect could have done it, on motive alone, so the killer is not the only one with a reason.
• Only one suspect could have done it, on evidence, so the answer is not a vote of opinion.
• The key clue is visible early but only makes sense late, once another piece arrives.
• The solution explains everything, including the red herring. A loose end at the reveal reads as a mistake, even when deliberate.

How We Build Our Cases

Each of our printable cold case files is a full investigation: around 24 to 37 documents depending on the case (police reports, statements, receipts, phone records), six suspects, and either sealed envelopes with the solution in the last one or a separate solution file. Our case file PDFs come in two editions, full color and printer-friendly, in US Letter and A4, because a case nobody can print is a case nobody plays.

Our online cases follow the seven-stage order described above: case file, crime scene, witness statements, forensic evidence, intercepted messages, interrogations, accusation. Players get one accusation, so every clue matters.

We also translate our cases by hand into German, French, Spanish, Italian, Dutch, Japanese and Korean instead of relying on raw machine translation. In a mystery, one mistranslated word can flip a clue: "before" and "after" are a single word apart.

Format	Who knows the answer	How the reveal works
Homemade party game	The host, and the killer knows their own role	Host reads the solution after the accusations
Our party kits	The host, with a host guide	The host keeps the solution sealed until the final vote
Our printable cold cases	Nobody, everyone investigates	Sealed envelopes; earlier ones confirm reasoning, the last holds the solution
Our online cases	Nobody, everyone investigates	Seven stages, then one accusation

Common mistakes we see

• Too many suspects. Six is plenty. Ten becomes bookkeeping.
• Motive as the solution. Motive satisfies the story; evidence should decide the case. Plenty of people want someone dead.
• Timelines that don't add up. Write every time on one sheet and check travel times. Players will.
• Gore instead of tension. The body is the dullest part. The secrets carry the game.

To see these principles in a finished case, play our free one on the cases page and watch how the evidence is ordered. For what separates good design from bad, read what makes a great detective game.

FAQ

How long should a homemade murder mystery be?

For a party, aim for two hours of play. For a solo case file, 10 to 20 documents is a comfortable first project.

Should the killer know they're the killer?

In a party game, yes. They need to know which part of their story to lie about. In a case file, the question doesn't arise because players read everything.

What's the easiest type of mystery to write first?

A closed circle: a single location, a short time window, and five suspects. It limits what you must track.

Do I need a twist?

No. A clean, fair solution beats an unearned twist. Players remember catching the lie, not the surprise.

How many suspects should a murder mystery game have?

Four to six. Fewer makes the answer too easy to guess; more turns the game into bookkeeping. Our own cold cases use six.

How do you make a murder mystery game at home?

You make a murder mystery game at home by writing the true story of the crime first, choosing four to six suspects with secrets, turning the killer's actions into clues, and splitting those clues across characters and rounds. A first homemade game takes most people several evenings to write and test.

How do you write a murder mystery party for adults?

Write it the same way as any murder mystery, then give adult guests more room to scheme: secrets with real stakes, goals that set characters against each other, and a killer who has to lie convincingly for two hours. Adults enjoy bluffing more than puzzle-solving, so give them more to hide.

How long does it take to write a murder mystery game?

A short case file for two players can be drafted in a weekend. A full party game with six or more character booklets, three rounds of clues and a host script usually takes a few weeks, mostly spent testing and fixing the spots where players stall.

Is there a template for writing a murder mystery?

Yes: before writing anything, fill in the victim, place and time window, method, killer and motive, the killer's exact lie, the record that proves the lie, one red herring, and a non-murder secret for each suspect. If any of those lines is empty, the mystery is not solvable yet.

How do you write a murder mystery?

To write a murder mystery, decide the solution first: who did it, how, when and why. Then build suspects who each had a reason, turn the killer's actions into clues, plant one fair false lead, and check that a reader could reach the answer from the clues alone.