The Big ZipperɹǝddᴉZ
(Published on 20. August 2026, 18:53 by TrivialHomology)
Rules
- Standard Sudoku rules apply. Place the digits 1-9 once each in every line, column and 3×3 box.
- Draw a path of orthogonally connected cells starting in R1C1 and ending in R9C9 (marked purple) which does not cross or touch itself (not even diagonally) and is 180°-rotationally symmetric. This path forms a valid zipper line: Any pair of digits with equal distance from the center of the zipper line has the same sum. If the zipper line is of odd length, the central digit is that sum. Additionally, digits along the path alternate in parity.
- Kropki dots. White dots lie on the path and the digits separated by a white dot are consecutive. Black dots don't lie on the path and the digits separated by a black dot are in a 1:2 ratio.
- Some of the grid is covered in fog. Placing correct digits may remove some fog somewhere. No guessing is required.
Click on the picture to open the puzzle in Sudoku-Pad
Also check out my other puzzles, I am particularly satisfied with these:
Solution code: The digits on the zipper in row 9, in reading order.
Last changed on on 20. August 2026, 21:49
Solved by jalebc, jordanza, zonny, andreatetta, palletpusher, Ipit, Fool on Hill, GG_70, kublai, redgecko, Arheus, Snookerfan, sacker, lmdemasi, RJW1985, at_ing, Exigus, zhan, jkuo7, Myxo, kangaroo
Comments
on 21. August 2026, 16:24 by Snookerfan
Fun and tough puzzle! Well done, thanks
on 21. August 2026, 01:03 by GG_70
I really liked this :)
on 20. August 2026, 21:49 by TrivialHomology
Edited Sudokupad-Link
on 20. August 2026, 20:58 by Ipit
It took me considerable long time, but OK :-)
on 20. August 2026, 20:21 by palletpusher
Very lovely puzzle. I really enjoyed the break-in and the parity logic throughout. Thank you!
on 20. August 2026, 19:54 by zonny
Very enjoyable!
