Follow all the clues
Each suspect has a clue. Read the general clues too: they may tell you how many people were in a room.
The detective’s handbook
How do you play
Moredoku?
Everyone has a place. One person has something to hide. Follow the clues and use logic to discover who.
Try the mini case Or keep reading at your own pace.
The starting point
Three rules. One logical solution.
One per row and column
Each person occupies one cell. In the finished puzzle, every row and column contains exactly one person. This rule applies across the entire map, including across room boundaries.
Place the victim last
Place the suspects first. One cell remains for the victim. The only other person in that room is the killer.
Counts of people include the victim. In the pirate bonus, you instead find the treasure chest and the pirate who hid it.
The small maps below are separate practice examples. They do not reveal solutions to existing cases.
Example 01 · combining clues
Two chairs.
Only one possible place.
“B was sitting on a chair.”
A is already placed with certainty. No one else can therefore occupy A’s row or column.
There are two chairs. The chair in A’s column is ruled out. Only the chair at the lower left remains: that is where B belongs.
Combine the clue with the row and column rule. A possible place becomes a certain placement.
Map fragment01 / 03
× ruled outB certain place
Example 02 · ruling out cells
No placement yet?
You still know more.
“C was next to the plant.”
Next to means one cell horizontally or vertically, within the same room. The three question marks are possible places for C.
The cell to the right of the plant is beyond the thick room boundary, so it is ruled out. Diagonal cells and more distant cells are ruled out too.
Note C in the three possible cells. Another clue will help you narrow them down further.
“Diagonally next to” means one diagonal step within the same room. “On the same diagonal” can be farther away and cross room boundaries. An explicit exception in a clue takes precedence.
Possible places for C02 / 03
ConservatoryHall
? still possible× not possible for C
Example 03 · finishing the case
The final place
tells the story.
A, B and C are placed. Only row 3 and column 4 have no person yet. Their intersection is the place for victim V.
V is in the lounge. A is the only other person in that room. That makes A the killer. B and C are in the hall, so neither shares V’s room.
Place the victim and select ‘Check’ in the game. A correct solution closes the case.
The final piece of evidence03 / 03
HallLounge
V last placement
Your tools
Think it through on the map.
Note a possibility
Select a person, then briefly click or tap a cell to make a note. You may note the same person in several possible cells.
Place a person
Certain about the location? Select the person and hold the correct cell without moving until the placement circle is complete. A short tap only makes a note.
Take a step back
‘Undo’ restores your previous action. Placing a person removes their notes; undoing the placement restores those notes too.
Use a hint
Stuck? Select ‘Hint’. Each page explains a logical step leading to a placement or several exclusions. The hint does not change your map: you carry out the step yourself.
Be careful when excluding cells
The crosses in example 02 only mean that C cannot be there. The game’s ‘Exclude’ tool adds a general cross: nobody can be there. Use a person’s notes to mark their possible locations instead.
Your first case awaits
Ready to investigate?
Start with ‘Very easy’ to learn the controls. You can play straight away as a guest; your progress is saved on this device.
Choose your first case