Logic Masters Deutschland e.V.

Normal Sudoku rules apply (each row, column, and given 3x3 box must contain the digits 1 to 9). Everything is mod 10. So a 6 might mean 6, or 16, or 26, etc.

The following variants are all subject to the mod 10 rule. Digits in a cage cannot repeat and must add to the sum in the top left corner - e.g. if the number in the corner is 0, the digits might sum to 10, 20, 30, etc. Digits along an arrow must sum to the number in the circle - e.g. if a 4 is in the circle, the digits along the arrow might sum to 4, 14, 24, etc.

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