Pure deduction
Every clue contributes to a single logical solution. You never need luck to close a case.
Murder sudoku and detective logic puzzlesMystery Grid
Every clue is true. One suspect isn't.
Solve the grid. Unmask the killer.
Mystery Grid turns murder mysteries into fair, bite-sized logic puzzles. Read the clues, place each suspect, and reveal the culprit—no guessing, no gore, just deduction.
- murder sudoku
- murdoku
- detective logic puzzle
Available on App Store and Google Play
Start with your first creation today.
11Victorian manor mysteries
1 solutionfor every fair logic case
Offlineplay at your own pace
Built around the outcome
A fair mystery in every grid.
A mystery in minutes
Compact cases combine the satisfaction of Sudoku with suspects, rooms, and a culprit reveal.
Crime without gore
Enjoy the intrigue of a whodunit through a hand-drawn paper-and-ink case-file aesthetic.
Real App Store screenshots
See the app before you tap download.
Every image below comes directly from the current App Store listing.
How it works
Three steps from curious to complete.
The rules are simple enough to learn in Case Zero, then each case adds a deeper deduction chain.
- 01
Read the evidence
Each suspect provides a truthful clue about a room, row, column, object, or position.
- 02
Place and eliminate
Use the one-per-row and one-per-column rule to mark possible, confirmed, and impossible cells.
- 03
Reveal the culprit
When every suspect matches the clues, the unused row and column expose the victim—and the killer.
Practical guides
Answers for the thing you came to do.
Detailed, intent-specific help—then a direct path to doing it in Mystery Grid.
Guide 01
How to Play Murder Sudoku: A Beginner's Guide
Learn how murder sudoku combines row-and-column logic with truthful detective clues, then try the method in Mystery Grid.
Read the guide ↗Guide 02Murder Sudoku Rules: Rows, Clues, and the Culprit
A clear murder sudoku rulebook explaining suspect placement, truthful clues, elimination marks, and the final culprit reveal.
Read the guide ↗Guide 03How to Solve Logic Grid Puzzles Without Guessing
Use direct clues, exclusions, single candidates, and deduction chains to solve logic grid puzzles methodically.
Read the guide ↗Guide 04What Is a Detective Logic Puzzle Game?
Discover how detective logic puzzles combine truthful evidence, grid constraints, and whodunit atmosphere—and how Mystery Grid plays on iPhone.
Read the guide ↗Guide 05An Offline Mystery Puzzle Game for iPhone
Why short, offline detective logic cases work well for flights, commutes, and quiet breaks—and how to play Mystery Grid without a connection.
Read the guide ↗Frequently asked questions
Before you begin.
Quick answers, with a complete guide when you want the details.
How do you play murder sudoku?
Place each suspect once so no two share a row or column. Combine that rule with the written clues until every placement is forced and the culprit is revealed.
Learn moreWhat are the rules of murder sudoku?
Each clue is true, every suspect has one position, each used row and column holds one suspect, and a fair case has one logical solution.
Learn moreHow do you solve a logic grid puzzle without guessing?
Translate each clue into confirmed and impossible cells, scan rows and columns for the only remaining option, and repeat as each placement creates new deductions.
Learn moreIs Mystery Grid a detective logic puzzle or normal Sudoku?
It uses Sudoku-like row and column constraints, but you place suspects in rooms and interpret clues instead of entering numbers.
Learn moreCan I play Mystery Grid offline?
Yes. Mystery Grid is designed for offline play, making its short cases suitable for travel, commutes, and quiet breaks.
Learn moreEvery clue is true. One suspect isn't.
Your first case is waiting.