Logic Masters Deutschland e.V.

Normal Sudoku rules apply.

Region Sum Lines: Box borders divide lines into segments with equal sums. The sum for different lines can be different.

Kropki: Digits connected by a black dot have a 1:2 ratio (one is double the other).

Quadruple: Every digit in a white circle has to be assigned to one of the four surrounding cells. The black ellipses around the quadruple clues don't mean anything.

Arrow: Digits along an arrow sum to the number in the attached circle.

Ellipse: Digits inside a red ellipse are odd.

Disjoint Groups: Cells that appear in the same position relative to their 3x3 box must not contain the same digit. For example, if there is a 3 in r1c1, then you can't have a 3 in r1c4, r1c7, r4c1, r4c4, r4c7, r7c1, r7c4 and r7c7.