Yin Yang 5 on a Side
(Published on 3. October 2026, 17:30 by Md88keys)
by Md88keys
Play in Sudokupad
Normal sudoku rules apply.
White dots pair consecutive cells.
Black dots pair cells in a 2:1 ratio.
Yin Yang: Shade the grid so that so that the white dot cell pairs are shaded and the black dot pairs are unshaded. All shaded white dots are given. Each region must be orthogonally connected and there must be no 2x2 regions completely shaded or completely unshaded. The shaded cells within a box will sum to a number that is different from every other shaded box sum.
5 on a side: Cells containing the digit 5 must be in the same region, either all are shaded or all are unshaded.
Solution code: One letter (S or U) and nine digits. Is R4C1 Shaded or Unshaded, then list the digits in the row.
Comments
on 8. October 2026, 17:20 by VitP
surely there are more than 38 yy fans ?
one or 2 tricky parts, but otherwise quite easy, within the yy paradigm.
i would use the wording
"in the shaded region, all white dots are given"
on 6. October 2026, 18:59 by Snookerfan
Very nice and fun, thanks!
on 6. October 2026, 07:31 by blueberrypug
@anothermember yes you do need it in the very end or otherwise the puzzle doesn't solve
on 4. October 2026, 15:19 by anothermember
Very nice! It might have slipped my mind where I used it but I don't think I needed the shaded box sum rule in the end.
on 3. October 2026, 21:22 by Decapod
It started and ended with the shading, before the 1st digit and after the last :-).
Very satisfying, but not easy for me - 46 minutes.
on 3. October 2026, 18:51 by Elliott810
Brilliant puzzle! Thank you:)
on 3. October 2026, 18:49 by Blake Saligia
Multiple solutions exist if without this negative constraint
--yes, I included that rule in the yin yang section, "all shaded white dots are given", but I worried that was unclear in the original rules, so I added a comment as well.
on 3. October 2026, 17:33 by Md88keys
To clarify the white dot negative constraint: Orthogonally connected shaded cells without a given white dot will not be consecutive.
