One Sum Yin & Yang
(Published on 9. June 2025, 10:25 by Visumation)
Rules:
Normal sudoku rules apply.
Yin Yang: Shade some cells such that all shaded cells forms an orthogonally connected region and all unshaded cells forms an orthogonally region. No 2x2 can be entirely shaded or unshaded. Shaded cells contain the value of the digit it contains. Unshaded cells contain the negative value of the digit it contains.
All cages in this puzzle contain values that sum to 1. Digits do not repeat in cages.
Values separated by a white dot are consecutive.
Values separated by a black dot are in a 1:2 ratio.
Solution code: Row 2
Comments
on 11. June 2025, 14:23 by nunc
One of my favourite puzzles. Thank you very much!
Thanks a lot. /vis
on 11. June 2025, 10:19 by madhupt
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on 10. June 2025, 22:11 by madhupt
What a delightful puzzle! Simon’s yin-yang example finally comes true. Thanks for sharing this beautifully set sudoku.
Thanks. /vis
on 10. June 2025, 03:46 by RedBarchetta
Wonderful. Great math. Really enjoyed the key to breaking in.
Thanks a lot. /vis
on 10. June 2025, 00:08 by Exigus
Based on my time a 4* but that is mainly because I forgot the rules multiple times and tried to make the cages add to 0. A very lovely puzzle though. Thanks!
Thanks a lot. And yes. Maybe it is a small 4. /vis
on 9. June 2025, 21:10 by Elker
Brilliant puzzle, thanks for setting.
Thanks a lot. /vis
on 9. June 2025, 18:30 by VitP
definitely an "experts only" puzzle, so difficulty 4 is more appropriate.
the yin-yang aspect should be given low priority by the solver (the key is in col 9), and indeed, there are multiple yy patterns that work
on 9. June 2025, 14:01 by rameshsrivats
Much fun. And an exemplary shape :)
Thanks a lot. /vis
on 9. June 2025, 13:36 by Fizz
What a delightful puzzle, thanks a lot!
Thanks a lot. /vis
