- ➊ Write a number between 1 to 3 into each cell of the diagram.
Cells with the same number constitute
regions which must contain exactly as many cells as the number indicates.
- ➋ Two different regions of the same size must not be
orthogonally adjacent (diagonally
- ➌ Two clue numbers may belong to the same region. It is possible
that some regions do not contain any clue number.