my first puzzle with the "sum detector" constraint! didn't include the negative constraint that it typically comes with, though.
Rules: Normal Sudoku rules apply. A digit in a cell containing an arrow indicates the sum of the digits in the first cell(s) in the direction of the arrow, where the number of cells must be determined by the solver and may be different for each arrow. (A cell containing multiple arrows indicates the sum of each arrow in its cell, not the sum of all arrows in its cell.)
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