One King per realm
Each coloured territory contains exactly one King. Small or narrow realms usually reveal the earliest deductions.
Four laws. One peaceful kingdom.
No maths and no guessing required. Find one royal seat in every realm, row, and column while keeping every pair of Kings apart.
One King per row
Every horizontal line contains exactly one King. Once a King is placed, mark the rest of that row unavailable.
One King per column
Every vertical line also contains exactly one King. Row and column pressure often combine to force a realm.
No diagonal neighbours
Two Kings cannot touch corner-to-corner. A King cell rules out the four cells diagonally beside it.
Using the royal board
Use a mark when a cell cannot contain a King.
The second tap changes the mark into a King.
The third tap returns the cell to empty.
A strong opening: inspect the smallest realm, then remove cells blocked by occupied rows, columns, or diagonal neighbours. If only one square remains, you have found a justified royal seat.