Swans

What is the Swans rule?

Swans is a variant sudoku rule: each arrow line holds exactly one swan digit, which looks along the arrow and sees as many following cells as the line has arrowheads; those cells sum to the swan's value.

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.