Normal sudoku rules apply. Place nine circles in the grid: one in each row, column, and 3×3 box, with the digits in the circled cells forming a complete set of 1–9. Digits may not repeat within a cage. If an X is in a row with circled digit A and a column with circled digit B, the digits in the cage containing this X sum to A×B (A and B need not be distinct).
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