Zipper Loop
(Published on 11. September 2025, 01:10 by ThePedallingPianist)
Check out other puzzles in my loop drawing series.
Rules:
- Normal sudoku rules apply.
- Draw a single one-cell wide loop that moves orthogonally between cells and does not branch or touch itself (not even diagonally).
- A pair of digits separated by a white dot are either both on the loop or both off the loop.
- Box borders divide the loop into Zipper lines with an odd number of cells (length 1 is allowed).
- On a Zipper line any pair of digits that are the same distance from the line's central cell, sum to the digit in that center cell.
- Cells with a lavender diamond are on the loop, and show the center of a Zipper line.
- If the loop enters a box more than once each loop segment is considered independently.
- Digits separated by a black dot are in a 1 to 2 ratio and digits separated by a white dot are consecutive.
Solution code: Row 9
Comments
on 28. September 2025, 20:52 by Firebird
Unique and very, very enjoyable!
on 22. September 2025, 15:36 by bboom
Very fun and original. Not easy but it has nicely incremental steps forward, I never felt stuck despite taking a fair bit of time to solve.
on 17. September 2025, 22:10 by jubengo
This was very smooth and satisfying ! Thank you for this remarkable puzzle :)
on 14. September 2025, 05:54 by AdarshN
VERY fun puzzle, really smooth and satisfying!
on 12. September 2025, 20:04 by Franjo
If I didn’t know whom you tried to imitate I would have thought it was yttrio… Wonderful deductions all along the way. Thank you very much for creating and sharing.
on 11. September 2025, 22:59 by Kawkaz
Very fun solve, great setting from start to finish
on 11. September 2025, 10:37 by ThePedallingPianist
Loop drawing series link fixed!
on 11. September 2025, 09:23 by TJ
Some very surprising deductions here with this original rule set made this a very rewarding and smooth solve. Thanks again!
on 11. September 2025, 03:28 by ViKingPrime
A surprisingly smooth melange of zipping and looping.
on 11. September 2025, 03:27 by blackjackfitz
Really lovely stuff here, I'm honored. And very approachable for TPP!
