Logic Masters Deutschland e.V.

Normal sudoku rules apply (1-9 without repeats in every row, column, box)

The purple numbers outside the grid are X-Sums (first X digits from that end of the column, where X is the first digit from that end of the column, add up to the sum). These are the 6 and 9.

The orange 0s on the outside of the grid are sandwich sums. They are the sum of the digits between the 1 and 9 of their rows, not including the 1 and 9.

Digits separated by a white circle have a difference of exactly the number within the circle

Digits marked in grey are identical to the digit on the opposite side of the grid. For example, R2C3 and R8C7 contain the same digit. This ONLY applies for the digits marked in grey.

The golden lines are nabner lines. Along a line, no two digits may be consecutive or identical.

Extra hint (puzzle has unique solution without, but I personally needed it): The two nabner lines with the outlines each have the same set of digits.

Click the image for the solving tool