Logic Masters Deutschland e.V.

Normal Sudoku rules apply:Each row, column, and 3x3 box must contain the numbers 1-9 once.

Region sum lines:For each line, digits on the line have an equal sum N within each box it passes through.

Quadruples:Every digit in a circle has to be assigned to one of the surrounding cells.

White dots:Two adjacent cells are separated by a white dot, the difference between their values must be exactly 1.

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