Logic Masters Deutschland e.V.

Normal Sudoku rules apply: Place the digits one to nine once each in each row column and box

Double Arrows: The sum of the digits on a line between two circles is equal to the sum of the digits in the circles. Lines only change direction in the centre of cells.

Zipper Lines: Digits equidistant from the centre of a purple zipper line sum to the digit in the centre of the line.

Play on SudokuPad