Casebook: Murder Mystery Logic
Find the lie, name the culprit
Only for iPhone
Free · In‑App Purchases
iPhone
A storm-locked lodge. Six suspects. Every statement is true, yet one puts the killer in the greenhouse. Read the testimony, find the contradiction, name the culprit.
Read the statements. Find the contradiction. Name the culprit.
No timers, no luck, no tapping speed. Just you and a case that has exactly one answer.
A night of freezing rain at a mountain lodge, cut off by the storm.
The master of the house is found struck down. Six people were there.
Every one of them gave a statement, and every statement is true.
That is the hard part.
HOW IT PLAYS
- Nobody lies to you. The testimony simply doesn't point anywhere - until you
cross-reference it
- "The Butler was not in the greenhouse." "The one who carried the rope was in
the study." Rule things out until exactly one arrangement survives
- Fill the grid, then face one final question: who is the culprit?
- There is always exactly one answer. Guessing will not get you there
FEATURES
Endless cases
Every case is generated fresh, and the app verifies that the solution is
unique before it hands the case to you. You will not run out.
Four case levels
From a Minor Case (3x3) up to a Cold Case (6x6). Even the smallest case gives
you who, with what, and where - a real whodunit, not a warm-up.
Today's Case
Generated from the calendar date, so everyone in the world is working the same
case today. Your streak is tracked.
Three scenes
The Snowed-In Lodge, The Night Express, The Hot-Spring Inn. Each brings its
own suspects, objects and rooms.
Detective rank
Apprentice, Assistant, Detective, Inspector, Master Detective. Cases closed
become a title.
Tools of the trade
Pencil mode for tentative marks, auto-elimination, and a single-cell hint when
a case truly stalls.
WHO THIS IS FOR
- Readers who have finished every Christie and want to sit on the other side of
the desk for once
- Sudoku and crossword solvers who would rather reason in words than in numbers
- Anyone who wants the five minutes on the train to be worth something
- Anyone tired of energy meters, daily login streaks and pop-ups
PRIVACY
- No account. No email. Nothing to sign up for.
- Cases are generated on your device, and your records stay on your device.
- No third-party advertising SDKs and no behavioural tracking.
- No cloud sync (which also means your records do not travel to a new phone).
The app may contact Apple's public API to show other apps by the same developer.
Nothing about you is sent when it does.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, torankirite, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- torankirite
- Size
- 1.4 MB
- Category
- Puzzle
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later.
- iPhone
- Languages
- English and Japanese
- Age Rating
4+
- 4+
- Contains
Advertising
- In-App Purchases
Yes
- Premium $4.99
- Copyright
- © 2026, Torankirite