AI Game Cards

Murder mystery prompts for ChatGPT, Claude & Gemini

Updated

Whodunits for one detective or a party of up to eight, plus an interrogation game, each answer fixed before you start. Free, no signup. Each game is a ready-to-play prompt (we call it a game card) that you open in your own AI assistant.

A sealed mystery is a whodunit whose answer is written down before you start. The culprit, the method and the evidence go into the game's file before release, and we publish a fingerprint of that answer (a SHA-256 hash) at the same time. The assistant plays the suspects from the file, so it cannot pick a culprit to match your accusation, and at the end you can check that the answer you are shown is the one fixed before you played.

New to AI games? Start with this guide: AI murder mystery games that can't cheat.

GameWhat it isPlayersLengthRated
Blackfile №1: The Vanishing at Larchmont Hall A 1925 country-house whodunit: an heiress bolts a glass conservatory from the inside and is not there when the doors come down. 1 60–90 min 12+
Blackfile №2: A Death at the Wyke Hydro A snowbound 1929 poisoning whodunit: six suspects, one cup of hot milk, and an answer sealed before you start. 1 75–105 min 12+
Blackfile №3: The Long Exposure at Harrowfell A 1953 observatory whodunit: a death on the dome stair, six suspects who cannot leave the fell, twenty moves, and a culprit sealed before you start. 1 60–90 min 12+
The Third Carol: A Christmas Murder Mystery Game A Christmas murder mystery game for one to eight at one screen: six suspects, four rounds of evidence, and every line sealed before play. 1–8 60–90 min 12+
Under Caution: An Interrogation Game An AI detective game for one: question three suspects and break their stories against the evidence, ruled by a list sealed before play. 1 25–45 min 12+
No Ghost Speaks: A Halloween Murder Mystery Game A Halloween murder mystery game for 12 and over, one to eight at one screen: five suspects, twelve exhibits, every answer and lie sealed before play. 1–8 45–75 min 12+

The Third Carol: A Christmas Murder Mystery Game, Under Caution: An Interrogation Game and No Ghost Speaks: A Halloween Murder Mystery Game keep their answers in a sealed file on this site, so they need a chat that can open links, such as ChatGPT or Claude. The others also play from the full game card, pasted in.

Sealed Mystery № 003 Blackfile №1: The Vanishing at Larchmont Hall 1 player60–90 min Sealed Mystery № 008 Blackfile №2: A Death at the Wyke Hydro 1 player75–105 min Sealed Mystery № 025 Blackfile №3: The Long Exposure at Harrowfell 1 player60–90 min Sealed Mystery № 030 The Third Carol: A Christmas Murder Mystery Game 1–8 players60–90 min Sealed Mystery № 031 Under Caution: An Interrogation Game 1 player25–45 min Sealed Mystery № 037 No Ghost Speaks: A Halloween Murder Mystery Game 1–8 players45–75 min

Can ChatGPT run a murder mystery without cheating?

Play detective with an assistant and it wants you to be right. Accuse the gardener and the gardener becomes guilty; the clues you half-remember are bent into a confession. Nothing was decided in advance, so nothing can contradict you.

Every case here is written answer-first. The three Blackfile cases are for one detective working alone. The Third Carol, a Christmas murder mystery, and No Ghost Speaks, its Halloween counterpart, are for a table of up to eight at one screen: your guests are the detectives, and the assistant plays every suspect from lines written before play. Under Caution is an interrogation game with three suspects and three signed statements, and you break each statement by citing an exhibit that contradicts it. In all six, every alibi and every lie existed before you opened the chat.

At the end the game master reads out the sealed answer and gives you its file. Open /verify/, pick the game and paste the file's text exactly as printed: your browser rebuilds the fingerprint and compares it with the one we published. If a single character of the answer had changed, the two would not match.

Questions about murder mysteries

Can I host a murder mystery party with ChatGPT?

Yes, with The Third Carol at Christmas or No Ghost Speaks at Halloween. Both take one to eight players at one screen and ask only for first names or nicknames. The guests are the detectives and the assistant plays all the suspects, so nobody needs a character booklet or a costume. Everyone hears the same evidence, questions go round the table, one person types, and the evening ends with one accusation you can check against the sealed answer. The Third Carol runs 60 to 90 minutes and No Ghost Speaks 45 to 75; both are rated 12+.

Are the cases actually solvable, or do they need a leap?

The whodunits are built so the culprit follows from evidence you can reach in play, and nothing turns on a roll. The Third Carol and No Ghost Speaks were checked by script against a single timeline that leaves exactly one suspect fitting the evidence, and in No Ghost Speaks the same suspect still fits with any one exhibit taken away. Under Caution has no culprit to find: each suspect's lies are broken by contradictions on a sealed list, and before release every pair of statements and exhibits was checked against a timeline of the case, so every contradiction that holds is on that list.

Can I replay a sealed mystery?

You can, but the answer is fixed, so a second run of the same case is a re-read: worth it to find the clues you walked past, not to be surprised again. Each case has its own unrelated solution, so finishing one spoils none of the others, and Under Caution's three interviews are separate cases too.

If you like murder mysteries