Murdoku: Free Murder Mystery Sudoku Online
A fresh murder mystery every day — from the book club to the art museum. Read the room and direction clues, place every suspect on the crime scene, and expose the one who ended up alone in the victim's room. Every case is generated in your browser with exactly one solution.
What is Murdoku?
Murdoku puts a murder mystery on top of a Sudoku-style grid. The 💀 marks where the victim fell — that square is locked. Your job is to place every suspect on the map so that no two people share a row or column and every numbered clue is true at the same time. The suspect who ends up in the victim's room is the killer.
How the deduction works
Each coloured area is a room. No row and no column may hold more than one person — the victim counts. Clues pin suspects to rooms, describe who stood north of or beside whom, and tell you which rooms were empty. The suspect alone in the victim's room is the killer: fill the board, pick them, and press Solve the Case.
How to play
- Tap a suspect in the roster, then tap a free square to place them.
- No two people may share a row or a column — the victim's row and column are already blocked.
- The 💀 square is the victim: the suspect who lands in that room is the killer.
- Use the room colours: clues often pin a suspect to a single coloured area.
- When everyone is placed, choose your killer and press Solve the Case.
- Daily Case gives everyone the same crime scene each day; Practice generates unlimited fresh cases.
Strategy tips
- Place the suspects who appear in the most clues first — they anchor the board.
- The victim's row and column are dead squares — count them like occupied lines.
- An 'empty room' clue instantly eliminates every square of that colour.
- If two suspects could swap rooms, look for a direction clue that separates them.
- The killer's square always shares its coloured room with the 💀.
Murdoku vs Murdle
Both hide a murder inside a logic puzzle. Murdoku keeps the spatial Sudoku constraint — one suspect per row and column of the crime scene — and asks where everyone was standing. Murdle hands you a category grid instead: pair suspects with weapons, locations and motives. This site also hosts a fan-made Murdle-style deduction game with original daily cases.
Frequently Asked Questions
Have another question? Let us know.
Is Murdoku free to play here?
Yes. Every case on this page is free, unlimited, and generated in your browser — no download and no account.
Is this the official Murdoku game?
No. This is an unofficial, fan-made practice version with original cases. The original Murdoku by Manuel Garand is at murdoku.com.
What does the 💄 skull square mean?
It marks the victim and never moves. The victim's row and column count as occupied, and the suspect who ends up alone in that room is the killer.
How many suspects are in a case?
Four in both current difficulties, on a 6×6 crime-scene map with rooms, furniture and the victim.
Is every puzzle guaranteed to have one solution?
Yes. The generator verifies with a solver that exactly one placement of all suspects satisfies every clue and the room rules.
Can two people share a row or column?
No — and the victim counts. Their row and column are blocked from the start, which is often the key deduction.
How do I know who the killer is?
Solve the board first. Whoever is placed in the same coloured room as the 💀 is the killer — pick them and press Solve the Case.
Can I play on mobile?
Yes. The board and roster stack vertically on small screens — tap a suspect, then tap a square.
