Logic Masters Deutschland e.V.

I made this puzzle following Scojo's prompt to use zipper lines and anti quadruples.

• Normal sudoku rules apply.
• On zipper lines, pairs of digits equidistant from the center of the line have the same sum. For lines of odd length, that sum is the central digit on the line.
• Digits in a red circle may not appear in any of the four cells touching that circle.

Online in Sudokupad

See also:

• all the seats were occupied
• funky parmesan curls
• gedenksäule
• screwdriver
• i can't stop thinking about waffles