Case Mind: Detective Mystery

Sixteen hand-crafted murders, and new mysteries added as they are ready. One detective: you.

Case Mind is interactive detective fiction where you interrogate AI-controlled suspects, examine physical evidence, reconstruct the timeline, and make the final accusation — culprit, method, motive, and the proof to back it up.

WHAT MAKES IT DIFFERENT
Talk to suspects however you want. Ask about their alibi, press them on inconsistencies, calm them down, or confront them with evidence you've found — all in free text, no dialogue trees. Suspects respond in character, under pressure, sometimes lying.

But the AI can never cheat. Every fact, every piece of evidence, and the entire solution are locked in before you ever ask a question. The AI writes how a suspect responds — never what actually happened. Nothing is invented on the fly to trick you or bail you out.

THE INVESTIGATION BOARD
- Scene: the crime scene and every connected location
- Suspects: track stress, trust, and pressure as your questions land
- Evidence: a growing locker of clues, some obvious, some buried
- Timeline: reconstruct the night, beat by beat, as you uncover it
- Notes: your own detective notebook, plus auto-logged leads

MAKE THE ACCUSATION
Name the killer, the method, the motive, and the evidence that proves it. Get it wrong and the case stays open — but you've spent an attempt, and the clock is ticking. Get it right, and the full solution — and your rank on the leaderboard — is revealed.

THE DEDUCTION
No single clue names the killer. The angle of the blow tells you the hand that struck; the height tells you the build; a witness only ever glimpses a kind of thing, never a face. Each report rules out part of the household and settles nothing on its own — cross them on the deduction grid and exactly one name survives. Every clue is load-bearing: drop one and the case is no longer decidable. This is a logic puzzle wearing a trench coat, and the suspects lie about their alibis whether they are guilty or not.

AN OPEN-ENDED CASEBOOK
Sixteen authored cases — from a locked library to a runaway train, a poisoned gala to a country-house nightcap — each an honest whodunit with a fair solution and clues that were always there. They unlock in order, so the difficulty climbs with you. Plus fresh, fully solvable mysteries added to the casebook as they are ready.

PLAY IN YOUR LANGUAGE
Full support for English, Turkish, German, Spanish, French, Italian, Korean, Arabic, Chinese and Hindi — suspects even reply to you in your own language.

FREE TO PLAY
Every case is free, in full, with unlimited questions — nothing is ever cut off mid-deduction. Cases unlock in order as you solve them, never behind a payment. The free game is supported by ads between cases.

OPTIONAL SUBSCRIPTION
Removes all ads and adds 5 hints a month, to spend on whichever case has you stuck. It buys you quiet and a nudge — never a case, and never an answer.