Up-to-N Sums

What is the Up-to-N Sums rule?

Up-to-N Sums is a variant sudoku rule: a clue outside a row or column gives the sum of the digits from the edge up to, but not including, the cell containing the digit N.

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.