Modular Lines

What is the Modular Lines rule?

Modular Lines is a variant sudoku rule: any three consecutive digits along the line must belong to three different residue classes modulo 3 (i.e. one each from {1,4,7}, {2,5,8}, {3,6,9}).

In every puzzle here the setter’s own rules text is shown beside the board, so the exact wording for the puzzle you are solving is always one glance away. All normal sudoku rules apply unless the setter says otherwise.