Logic Masters Deutschland e.V.

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Normal Quattroquadri rules apply. Place the digits 1 through 9 in each empty cell. Digits must not repeat within the same row, column, or box.
Renban: digits along a pink line form an unordered set of consecutive numbers.
Region sum lines: along a blue line, the sum of digits on each line segment is the same; segments are separated by region borders.
Kropki dots: digits separated by a white dot are consecutive; digits separated by a black dot have a 1:2 ratio; not all dots are necessarily given