Logic Masters Deutschland e.V.

Place 1-9 in each row, column and 3x3 region.

Doubler: One digit is a doubler, it is up to the solver to determine which digit. The value of the DOUBLER is doubled, as doublers do.

Positive Diagonal: Digits cannot repeat along the positive diagonal thin blue line.

Region Sum Lines: For each thick blue line, VALUES on the line have an equal sum N within each box it passes through.

Modified X-sums: Clues at the edge of the grid show the sum of the VALUES of the first X DIGITS, where X is the first seen DIGIT.
The doubler DIGIT is first seen by an x-sum exactly once.
All other DIGITS first seen by an x-sum are seen by x-sum clues exactly twice.

Example: Given an x-sum clue of 2, a solver could determine that the doubler must be the DIGIT 1, which has a VALUE of 2 for the sum of the x-sum clue.

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