Sudoku meets murder mystery.

What is a Murdoku?

A Murdoku is a crime scene drawn as a grid and divided into rooms. Each suspect tells you something true about where they stood. Place all of them, and the murderer is the one person left alone with the victim.

Three rules, and that is all

• One person per row and per column — the victim included.
• "Beside" means directly next to something, in the same room. A wall breaks it.
• The murderer is alone with the victim in one room. Nobody else is in there.

Never a guess

Every case we publish is checked by our own solver: it has exactly one solution, and that solution can be reached by reasoning alone. If a puzzle needed guessing, it would not be here.

Five levels

Difficulty is measured by the reasoning a case demands, not by how big the grid is. A gentle case yields to reading the clues; a hard one asks you to think several moves ahead.