Murdoku Online
Sudoku rules meet a murder case. In Murdoku every suspect stands in their own row and column on a floor plan, and the person sharing a room with the victim is the killer.
Murdoku Online rules in short
- Meet the suspects
Each has a trait such as a hat, glasses or hair color.
- Read every statement
One might say a suspect is in the kitchen, another that two people touch diagonally.
- Place everyone
Put each person in their own row and column so all clues hold.
- Name the killer
The one suspect in the same room as the victim is the murderer.
Murdoku Online at a glance
- Cases
- 142 free puzzles plus a daily case
- Board
- A floor plan with rooms
- Rule
- One person per row and per column
- Killer
- The only suspect in the victim's room
- Clues
- Plain language witness lines
- Account
- Not needed
- Category
- Logic and mystery games, mystery
The core rules
- Rows: One person each
- Columns: One person each
- Victim's room: Shared by exactly one suspect
Three rules, and every clue in a case leans on them.
Why it feels like Sudoku
The row and column rule does a lot of quiet work. Every time you place someone, a whole row and column close for everyone else. Combine that with one room clue and the board often collapses quickly, leaving only one spot for the last suspect.
Questions people ask about Murdoku Online
How do you play Murdoku Online?
Place each suspect on the floor plan so no two share a row or a column and every witness clue holds. The suspect left in the victim's room is the killer.
Is Murdoku Online the same as the Murdoku book?
It is the same kind of puzzle, played in the browser instead of on paper. The site has 142 free cases and adds a daily one.
Do I need to guess?
No. Each case has one answer you can prove step by step.
Is there a daily case?
Yes. Everyone gets the same new case each day.
Is it hard to start?
No. The early cases are gentle warm ups before the harder ones.
Ways to get better at Murdoku Online
- Treat it like Sudoku first. Each row and column holds exactly one person.
- Clues about rooms are often the quickest to place someone.
- Cross out squares that break a clue rather than guessing where someone goes.
- Find the victim's room early. Only one suspect can stand in it, so everyone else is locked out of those squares.
Facts checked on 2026-11-09. Murdoku Online belongs to Murdoku Online. Megadle is not linked to it.