Yin Yang Dominoes
(Published on 19. July 2025, 07:39 by Tank)
Yin Yang Dominoes
This is my first Yin Yang Puzzle, please let me know what you think in the comments. I'm not too sure how to rate this one. I'm tentatively putting it at somewhere between 2-3*
Rules:
Normal Sudoku Rules: Place the digits 1-9 in every row, column and 3x3 box
Killer: Digits in a cage must not repeat and sum to the number in the top left corner (if given)
Yin Yang: Shade some cells such that all shaded cells are orthogonally connected and all unshaded cells are orthogonally connected. No 2x2 area can be entirely shaded or unshaded.
Kropki: Digits separated by a black dot are in a 1:2 ratio
Shading: All cages have 1 shaded cell and 1 unshaded cell. The largest digit in a cage is always shaded and the smallest digit is always unshaded. ALL 3 GIVEN DIGITS ARE OF THE SAME SHADING
Link to puzzle below
Link to sudokupad
Solution code: Column 9 digits from top to bottom
Comments
on 20. July 2025, 18:51 by jorningekr
Great Puzzle.
Actually took me 3 tries, but that says more about me I think.
on 20. July 2025, 15:19 by JVA
@JoBerlin thank you very much
on 20. July 2025, 11:35 by JoBerlin
Sudokupad link with solution checking:
https://sudokupad.app/zh83rmuwoq
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Thank you! May I ask how you create this? It would be good to know for the future.
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Jo: it's really easy! When Sudokupad shows you the message that you completed the puzzle there is a link saying something like "create new link with this solution"
on 20. July 2025, 05:14 by Nemefish
Delightful puzzle. If you understand the rules of Yin Yang, this is on the more approachable end.
Really enjoyed a unique deduction in column 4 that I had not seen before.
on 20. July 2025, 01:49 by VitP
every yy puzzle is automatically level 3, just by the nature of the ruleset, UNLESS you load it up with givens or something.
then you assess the general difficulty of making progress, and THIS puzzle qualifies for an extra half level.
in other words, this is a "for experts only" puzzle.
HOWEVER, the main yy procedures can be taught to any beginner in 5 min, and the WHY of it can be explained in 15 min, so if we assume that all solvers WILL know the techniques, then we can reduce the PRACTICAL difficulty by one level.
for completeness, these are the techniques.
1) there will be exactly 0 or 2 colour transitions on the edges.
2) no chessboard pattern is allowed in any quad.
and a derived result, very useful here:
3) AT LEAST TWO of the edges have zero transitions.
so if you know these techniques, you can zip along here for quite a distance before you have to do the disambiguation, which is a bit tricky to spot.
on 19. July 2025, 20:19 by Playmaker6174
If one knows a certain trick then this will turn out to be a rather smooth solve. Very fun experience overall x)
on 19. July 2025, 19:49 by nunc
Beautiful puzzle. Thank you!
on 19. July 2025, 19:48 by One Eyed Man
Wonderful puzzle, very smooth solve. A great YY adventure, thanks for setting and sharing.
on 19. July 2025, 14:12 by Franjo
Funny YY-Sudoku! Thank you very much for creating and sharing this puzzle.
on 19. July 2025, 13:54 by marcmees
Well constructed. Was fun. Thanks
on 19. July 2025, 08:55 by Ramez
Such an enjoyable puzzle with a smooth solve path and nice tricks along the way. Thank you for setting and sharing this beautiful sudoku :)
on 19. July 2025, 08:43 by Tank
Revised description
