Logic Masters Deutschland e.V.

Disjoint groups. Cells that appear in the same relative positions in their boxes cannot contain the same digits.

The purple line is a zipper line where digits equidistant from the centre sum to the same amount. If the line has an odd number of digits then this amount is the same as the central digit.

Black dots mark a ratio of 2 between the two digits and white dots show a difference of one between the two digits. Not all dots are given.

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