Negative 8 YY
(Published on 20. November 2025, 17:15 by SennyK)
Another Yin-Yang puzzle with dynamic fog for those who love it :-)
I hope you will enjoy and I would be really grateful for all the comments and ratings.
Normal sudoku rules apply.
Yin-Yang: Shade some cells in the grid so that all shaded cells are orthogonally connected, all unshaded cells are orthogonally connected, and no 2×2 region is entirely shaded or entirely unshaded.
Values: A shaded cell containing digit x has value -x; an unshaded cell containing digit x has value x. In other words, shaded cells have negative values, and unshaded cells have positive values.
Region sum line: Box borders divide a blue line into segments which have the same sum of values. Different lines may have different sums.
Kropki dots: Values in cells joined by a white dot with 8 have difference of 8. Values in cells joined by a black dot are in a 1:2 ratio (i.e., one value will be double the other). Not all dots are necessarily given.
Hint (highlight to see): Black dot can only join two negative or two positive values. 4 and -8 are not in 1:2 ratio.
Killer: Values in a cage sum to the total given.
V: Values in cells joined by a V sum to either 5 or -5. Not all Vs are given.
Dynamic Fog of War: The grid is partially covered in fog. Placing correct digits reveals their own cell and may also lift fog elsewhere in the grid. No guessing is required.
The Erica Series:
Episodes: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12
If you liked this puzzle, I recommend trying out my other puzzles:
Symmetrical Fan
Night Club
Cops & Robbers
Broken Flashlight in the Dark
Blown Fuses in Electrical Installation
Important Hour on the Clock
Let Me Introduce Myself
Positive Symmetry
Pretty Odd Shaded Area <- Recommended for you!
It's What You Do in the Dark That Puts You in the Light
What Was the Sum Again?
(+5)-Yang <- Recommended for you!
Disgroup Joints
Find It All
What the Fog?
10-Arrows
Solution code: Ninth (9th) column of the grid from top to bottom (with the symbol "/" marking borders between shaded and unshaded cells, e.g., 123/4567/89).
Comments
yesterday, 13:24 by erml
A masterpiece, thank you!
yesterday, 04:54 by Voidslime
Very fun! I’ve never colored a yin yang from the inside out before!
on 24. November 2025, 07:53 by QuiltyAsCharged
Terrific puzzle! Keeps you on your toes
on 22. November 2025, 21:54 by samuel1997
Quite a stunning puzzle! Thank you!
on 20. November 2025, 23:18 by VitP
another fine yy puzzle.
fun fact: 2 digits that SUM to 8 also have a DIFFERENCE of 8 ... sometimes
on 20. November 2025, 22:41 by NotSoMagnifique
I stumbled through this one, but it was still lovely!
on 20. November 2025, 22:26 by Cantabrigiensis
Excellent puzzle; thank you very much!
on 20. November 2025, 20:05 by Snookerfan
Very nice! A bit harder than the expected 3 stars for me, which I actually like. Thanks!
