Modular Masyu
(Published on 20. December 2025, 01:39 by yttrio)
Rules:
Normal Sudoku rules apply.
Masyu: Draw a single non-intersecting loop through the centers of some cells that passes through every circle clue. The loop must turn on black circles and pass straight through the cells on either side. The loop must go straight through white circles and turn in at least one of the cells on either side.
The loop acts as a modular line. Each set of three adjacent digits along the loop must be one each from the sets [147], [258], and [369].
The digit in each given circle clue counts the total number of loop cells in all straight loop segments coming of of the cell (counting the cells where the loop turns, and counting the clued cell itself once).
6x6 Example:
The image below shows a sample 6x6 puzzle and solution with the same rule set.
Play the example 6x6 in SudokuPad.
Solution code: Digits on the loop in row 7 (left to right) followed by digits on the loop in column 7 (top to bottom)
Comments
on 21. December 2025, 03:40 by thoughtbyte
Excellent, thanks.
on 21. December 2025, 01:08 by Exigus
Fantastic! Thanks!
on 20. December 2025, 19:15 by Franjo
Fantastic puzzle! Combining Masyu with sight lines for Variant Sudoku felt quite natural, but adding the modular lines rule is brilliant - as is the setting here. I will never understand how you do these things… Thank you very much for creating and sharing another wonderful loop-puzzle.
on 20. December 2025, 18:55 by Silverscree
Wonderful! I'd love more masyu (and slitherlink) puzzles along this line. I'd also love some edge-versions of those puzzles, I think they're so underutilized and you're the loop-master!
on 20. December 2025, 16:51 by Myxo
Lovely!
on 20. December 2025, 14:01 by wuc
Awesome loop puzzle. Took some to get all the rules. But a wonderful solve path once you get it. Great setting thx.
on 20. December 2025, 11:04 by Snookerfan
Very nice! I never tried a masyu before and I liked it. Thanks
on 20. December 2025, 02:05 by Calvinball
Masynificent!
