Logic Masters Deutschland e.V.

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Constraints

Quattro Quadri: Place the digits 1 to 9 once each into the 3x3 boxes. Digits may not repeat in the same row, column, or box.

Dutch/Nabner Lines: Any two cells along an orange or yellow line must differ by at least 4. Digits also cannot be consecutive with any other digits on the line and may not repeat.

Kropki Pairs: Cells separated by a white dot must be consecutive. Cells separated by a black dot must be in a two-to-one ratio.

Quadruples: Digits in a quadruple circle must be placed at least once in the four cells touching that circle.