Positive Negativity 4
(Published on 25. March 2025, 05:49 by The Bard)
Normal Sudoku rules apply, place the digits 1-9 in each row, column, and box.
Yin Yang: shade some cells so that all shaded and unshaded cells form 2 orthogonally connected areas such that no 2x2 area is entirely shaded or unshaded, and all the digits values in the shaded area are negative values.
German Whispers: Adjacent digits on a green line must have a difference of at least 5. All horizonal German Whisper lines have been given, i.e. there is a negative constraint, but it only applies to digits horizontally adjacent to each other.
X-Sums: A number outside the grid gives the sum of the first N digits in that row or column, where N is the digit in the cell closest to the given clue. However, the solver must determine if the sum is negative or positive.
This is a sequel to Positive Negativity,
If you like this puzzle you may enjoy some of my other puzzles too, click HERE to see the other puzzles I have made.
Solution code: Row 6
Comments
on 11. May 2025, 03:13 by mcs131313
It is remarkable that the GR negative constraint was not needed until the final 4 cells (although I imagine it might have been a little easier if I had not totally forgotten about that rule)
on 24. April 2025, 06:45 by marcmees
Very nice. Thanks.
The solver must ... ? Does he really :-)
~~
Well... sort of. The sets are interchangeable but that is common when dealing with positive and negatives in this manner.
I am glad you liked it.
The Bard
on 26. March 2025, 22:58 by Elker
Bravo, what a brilliant puzzle. Twisted my brain in just the right way. I can echo everyone else’s experience that I also thought I broke it. Thanks for setting.
on 25. March 2025, 19:35 by byeler
I thought I broke something at least 5 times, but turned out my brain was the one that was broken
on 25. March 2025, 12:15 by Asi_Pasasi
Very nice puzzle. I haven't tried the prequels but I loved the use of the negative GW restriction, both as in "all GW lines are given", and as in negative numbers being used for GW.
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I also really liked the last few steps for row 6.
