Normal sudoku rules apply. A digit outside the grid must be inserted in one of the first three cells of the row or column as seen from that direction. Neighbouring digits along a green line must have a difference of at least 5.
Normal sudoku rules apply. A digit outside the grid must be inserted in one of the first three cells of the row or column as seen from that direction. Neighbouring digits along a green line must have a difference of at least 5.