Yin-Yang-Yong
(Published on 6. April 2025, 12:31 by Fenners)
Three types of shading? Chaos Construction? Why not?
Thanks go out to all those who tested!
Puzzle: Yin-Yang-Yong
Rules:
Normal Sudoku rules apply. Place the digits 1-9 once in each row, column and 9-cell region.
Yin-Yang-Yong: There are three shading orientations - Light, Medium and Dark. Construct a shading of the grid where all shading orientations themselves are orthogonally connected and no 2x2 area is entirely composed of one shading orientation.
Arrows: The digits on a tail of an arrow sum to the digit in the bulb. A tail of an arrow has the same shading orientation across it's length but must have a different shading orientation to it's bulb.
Chaos Construction. Construct nine 9-cell regions in the grid. Each region must be entirely composed of the same shading orientation.
Kropki: Digits separated by a white dot are consecutive. Digits separated by a black dot are in a 1:2 ratio. Not all dots are necessarily given.
Solution code: Row 5, left to right, 9 digits no spaces:
Comments
yesterday, 23:35 by philolologue
Some puzzles are so gratifying to solve because despite years of watching CtC, I still feel I'm a beginner and 3-star puzzles are far beyond me, and yet I somehow muddled my way through this one, convinced the whole time I'd end up making an irreversible error somewhere in the reasoning, yet found myself delightfully at the end after less than an hour! Really enjoyed each step of the way, and going to give PhenixDe's 5-star Neapolitan ying-yang a try now with my newfound confidence!
on 10. April 2025, 15:00 by dumediat
Excellent puzzle, thank you!
on 9. April 2025, 18:16 by Snookerfan
Really fun puzzle! I tried your second one first, which gave me some insights to attack this one a bit more efficiently. Thank you
on 8. April 2025, 21:45 by Titus Adduxas
That was really enjoyable. Funnily enough I did the other one first having given up on this one first time round! Glad I came back to it though because it’s excellent.
on 8. April 2025, 21:37 by Titus Adduxas
That was really enjoyable. Funnily enough I did the other one first having given up on this one first time round! Glad I came back to it though because it’s excellent.
on 8. April 2025, 04:18 by Douglass
Perfect puzzle with my two favourite rulesets! Thank you and please make more :)
on 8. April 2025, 03:38 by THef of Time
Great puzzle! Flowed lovely although I did worry I'd messed up my shading at one point when I forgot about the orthogonal connection constraint but luckily my logic was still sound and it worked out. :)
on 7. April 2025, 13:29 by 9Rookienumbers
I was afraid I would have trouble keeping track of regions/YYY, but it all fell nicely into place. Wonderful construction
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Thanks to all for your lovely comments. I've got a new one coming soon, which is very similar but doesn't require the Kropki dots. Just in testing at the moment! -- Fenners
on 7. April 2025, 13:07 by Franjo
I’m about to copy the comment of QAC who wrote down exactly what I thought… Thank you very much for creating and sharing this lovely CC-puzzle.
on 7. April 2025, 06:30 by QuiltyAsCharged
Fantastic puzzle! It's surprisingly smooth and approachable for this combination of rules.
on 7. April 2025, 00:26 by waffles_the_dog
Really fun puzzle, didn't reason about the way three colours would interact at first, but once I drew a bunch of lines across the grid and understood how they worked it solved really cleanly.
Thanks!
on 6. April 2025, 18:09 by seh_bas
really enjoyable mix of CC and YYY. THX <3
on 6. April 2025, 14:21 by Visumation
Very cool and approachable puzzle. Really enjoyed that. Thanks
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Thank you Visumation! Glad to hear you enjoyed it. -- Fenners
