Logic Masters Deutschland e.V.

Normal sudoku rules apply. Place the digits 1-9 once each in each row, column, and 3x3 region.

Purple zipper, arrows, and turquoise region sum lines are all present, but work a bit differently. Instead of their usual addition rules, they work with multiplication instead.

To clarify:

For the centres of purple zipper lines, digits an equal distance from the centre multiply to the number in the centre. If the zipper line has an odd length, they multiply to the digit in the centre. If the zipper line has an even length, the 2 digits in the centre can be read as a single 2 digit number, read left-to-right or downwards, which the digits along the line multiply to according to the rules. For example, the line (432486), if allowed by sudoku, is a valid zipper line, since 4x6 and 3x8 is equal to 24, the two middle digits.

Digits on an arrow multiply to the digit in the circle/pill. Pills can be multiple digits read left-to-right or downwards, as marked. The arrow starting in r5c3 ends in r7c3, this isn’t altogether clear as the pill in r7 covers the end of the arrow.

Digits on region product lines have the same product for each region they enter.

Use of a calculator or times table is not only allowed, but encouraged!