An AI murder mystery game that remembers every clue.
Someone is dead and everyone has a story. Question the suspects, search the rooms and accuse whoever you like. The Game Master plays every suspect and keeps the case straight from the first clue to the last.
Or start a case from a first line, no setup:
Free to play in your browser and on Android. The full memory system is on every plan, including free.
A real session, recorded
This is what a case looks like
The fire in the hearth has died down to grey ash, casting long, cold shadows across the library floor where Silas Halloway lies motionless, a heavy brass poker discarded just inches from his hand. You stand over him, your own breath hitching as you glance up at the mantelpiece; the grandfather clock has frozen precisely at 11:40.
> I keep what I saw about the clock to myself and question the housekeeper: where was everyone between eleven and midnight, and who had a key to the library?
As you stand in the stifling silence, the library door swings fully open, revealing Mrs. Gable. Her face drains of color as she spots Silas on the floor, her hands trembling as she grips her apron. Before she can retreat, you corner her with your questions. "I... I was in the kitchen," she stammers, her eyes darting away from the body. "I didn't see anyone, though I heard voices near the study just before the clock went quiet. As for keys... only Mr. Halloway and the master skeleton key held by the front desk staff were supposed to have access to this room."
> I gather every guest in the library, point at the stopped clock, and ask who was in this room at 11:40, then watch whose story changes.
You usher the remaining guests into the library; a nervous-looking man in a tweed suit, a quiet woman clutching a silk scarf, and an imposing figure who hasn't spoken a word since you arrived. As they crowd around the body, their eyes inevitably drift to the stopped clock.
Recorded on 2026-10-12 on the free-tier model: a fresh account, the first line "a murder mystery at a snowed-in mountain lodge: the host is found dead in the library, the phone line is cut, and I am the guest who noticed the library clock had stopped at 11:40", then the two actions above typed in. The AI named the story "Trapped Within the Frozen Lodge". The housekeeper ties the voices she heard to the moment "the clock went quiet" without being told about it. The first and last Game Master lines are cut to their first two sentences here; the whole exchange, every word, is published as a JSON file.
An AI murder mystery game is a mystery you solve by playing it, with an AI running the case. You set the scene in a sentence: a country house, a night train, a small town where everyone liked the victim. The Game Master writes the body, the room and the people in it. Then you investigate in your own words: "ask the cook who carried the tray upstairs," "check the window latch," "tell the widow we found the letter." Every suspect answers in character, and the case moves with what you uncover.
There is no list of questions to pick from and no fixed script. You can lean on a nervous witness, lie to a suspect to see how they react, or accuse someone in front of everyone. A mystery played this way only works if the game keeps its facts straight, which is why memory matters more here than in any other kind of AI game.
What you can do
How an AI murder mystery plays
Question anyone
Every suspect has an answer, an alibi and a reason to hide something. Ask the same question twice and watch whose story moves.
Search anything
Check the ashes in the grate, the guest book, the wet coat on the hook. If it is in the scene, you can look at it.
Clues that stay put
Auferet keeps characters, places and events in structured libraries, so the time on a stopped clock in scene two is still the time in scene twenty.
Play any side
Be the detective, a suspect with something to hide, or the one who did it. Your first line decides.
Any era, any setting
A Victorian manor, a 1920s club, a space station with one airlock. The opening sets the tone and the Game Master writes the case to match.
Free to start
Play a whole case before you pay anything. Auferet's free tier includes the full memory system and 10 free daily credits, in your browser.
Why memory decides it
A mystery falls apart when the AI forgets
Most AI games feed the model one fixed window of recent text each turn. In a mystery that is fatal. The detail you noticed early, the alibi a suspect gave in the first hour, the name on the torn letter, all slide out of the window as the case goes on. The game keeps answering confidently, just with a different time of death, and a mystery with moving facts cannot be solved.
That is measurable, so we measured it. Five facts were planted in the first turns of a story on the free model and asked about at turn 20, 40 and 60: once with only recent conversation to read, the way most AI games work, and once with persistent memory, the way Auferet works.
| Asked at | Recent conversation only | Persistent memory |
|---|---|---|
| Turn 20 | 3 of 5 facts | 5 of 5 facts |
| Turn 40 | 1 of 5 facts | 5 of 5 facts |
| Turn 60 | 1 of 5 facts | 5 of 5 facts |
Run on 2026-08-22 and again on 2026-08-27: both runs fell to 1 of 5 by turn 40 on recent conversation and held 5 of 5 with memory. Every question and raw answer is in the result file; the method is on the benchmark page, and how the memory works explains what it stores.
How it compares
AI murder mystery vs a party kit vs a scripted detective game vs a character chat
| AI murder mystery (Auferet) | Murder mystery party kit | Scripted detective game | AI character chat | |
|---|---|---|---|---|
| Who plays the suspects | The Game Master, all of them | Your guests, from printed scripts | Written characters with set lines | One character at a time |
| What you can ask | Anything, in your own words | Whatever the booklet covers | The listed dialogue options | Anything, but to one person |
| The case | Built around your choices as you play | Fixed, one solution | Fixed, one solution | Rarely a case at all |
| Replay | A new case every time | Once per kit | Once, then you know | Endless, but no structure |
| Memory of clues | Persistent across the whole case | On paper | Scripted | Varies, often a short window |
Mysteries are one kind of AI story game; the same engine runs text adventures and full text RPGs.
FAQ
AI murder mysteries, answered
Is there a free AI murder mystery game?
Yes. Auferet is free, with 10 daily credits to claim, and the free tier includes the full memory system. It runs in your browser; unlimited actions start at $10/mo.
How does an AI murder mystery game work?
You describe the setup in a sentence, or pick one above, and the Game Master builds the scene, the victim and the suspects. You question people, search rooms and follow leads in your own words. The suspects answer in character, and the case moves with what you find.
Does the AI keep the clues straight?
That is what Auferet is built for. It keeps characters, places and events in dedicated libraries and can search the whole story, so a time of death, a locked door or a lie a suspect told in an early scene is still there when you come back to it.
Can I play the killer, or a suspect, instead of the detective?
Yes. Your first line sets your role. Start as the butler with something to hide or the guest who did it, and the Game Master runs the investigation around you.
Can I play an AI murder mystery with friends?
Yes. Auferet has multiplayer: one player hosts, friends join, and everyone plays their own character in the same story, each with their own Game Master.
Can I play online without downloading anything?
Yes. Auferet runs in the browser on desktop and phone, and there is an Android app if you want it on your home screen.
Pick a crime scene. Find the killer.
Start an AI murder mystery free in your browser and see whether the clues still line up an hour in.
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