Detective Diary

A new case

One case a day, an unsolved mystery in your hands.

Become the detective — question the suspects yourself and make your deduction. Detective Diary is a mystery game where you find the clues and uncover the truth.

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01THE CASE

The killer changes every day. Solve the mystery.

A new case is assigned to you every day. There's no fixed story — every part of it responds naturally to what you say, Detective.

Start an intriguing experience where your interrogation becomes the key to cracking the case.

  • 1case

    Opens every day

  • 10min

    Per case

  • 1player

    Is all it takes

02INVESTIGATION

A suspect with a hardened face under dim light

01 / 04INTERROGATION

Interrogate the suspects

Depending on what you ask, suspects may lie to you — or let slip the clue that cracks the case.

03CASE FILES

Mystery cases

Take a look at the intriguing mystery case files waiting for you, Detective.

Evidence markers along a moonlit cliffside path by the sea

Even the smallest piece of evidence — everything is a clue.

Daily CaseScream at Dawn
A dark room lit by a single lamp, papers and evidence markers scattered on the floor
Daily CaseThe Fifteenth Invitation
Evidence markers in a radio booth with a microphone and mixing desk
Exclusive CaseThe Last Frequency
Police tape across the door of room 709 and a disordered hotel room
Exclusive CaseSealed Room 709

04QUESTIONS

Before you take the case.

See all questions

CASE RECEIVED

Today's case file is addressed to you.

Free on iOS and Android. Available in English, 한국어, and 日本語.

Download on theApp StoreGet it onGoogle Play