Nightshade
(Published on 29. June 2026, 00:18 by Lithium-Ion)
Normal Sudoku rules apply. Cells that are a knights move apart are not allowed to contain identical digits. Shade some cells in the grid such that no 2x2 region is fully shaded or fully unshaded. All shaded cells form one orthogonally connected region and all unshaded cells form one orthogonally connected region. A cell with an arrow equals the number of shaded cells in the indicated direction (excluding the cell itself), where unshaded cells do NOT block vision.
You can play this puzzle via the following link: https://sudokupad.app/u1zic2rp7x
Solution code: The digits in row 1, read from left to right.
Comments
on 11. July 2026, 08:42 by PatternSpren
This is an absolute fun puzzle. I loved every part of it.
Thanks
on 9. July 2026, 18:21 by bleppie
Really smooth and nice, thanks!
on 7. July 2026, 18:38 by Lithium-Ion
It is an honor to get a recommendation from James Sinclair, so thank you very much! This made my day.
on 6. July 2026, 14:43 by VitP
you might expect a yy puzzle to be level 3 as a matter of course.
turns out that this is really 2 separate puzzles.
the yy part is very easy, as such puzzles go, due to the specific counting clues.
then the anti-knight puzzle is quite easy, because you will have lots of "givens"
on 1. July 2026, 12:31 by Snookerfan
Very nice! Close to 3 star for me, thanks
on 30. June 2026, 13:24 by rojspencer
Very nice puzzle. Really enjoyed it.
on 30. June 2026, 09:50 by Nemefish
yinyang is my favorite variant and this is a brilliant implementation
on 29. June 2026, 23:54 by Exigus
Smooth for a yin yang, thanks!
on 29. June 2026, 19:14 by Franjo
Thank you very much for creating and sharing this lovely (and quite easy) puzzle.
on 29. June 2026, 19:09 by Srinidhi Kabra
Beautiful puzzle! Almost got stuck initially because I forgot that this is an anti-knight puzzle, but once I realised that it was a very easy and smooth solve, 1* for me personally.
on 29. June 2026, 15:46 by mihel111
Very impressed by the way the arrows interact. Very well set.
on 29. June 2026, 14:38 by Snaques
Very fun puzzle.
I did get on a wrong path by the rule "where unshaded cells do NOT block vision".
I read it as where they don't block the sightline, they can be disregarded, but where they do block the sight they are restricting the sightline.
on 29. June 2026, 10:36 by Fizz
A very fun and approachable puzzle with nice logic all the way through. Thanks a lot!
on 29. June 2026, 09:42 by Miatc
Beautiful 2* puzzle
on 29. June 2026, 07:41 by wuc
Having solved many yy puzzles it was approachable 2* to me. But an excellent entry puzzle to yy. Great setting thx.
on 29. June 2026, 07:05 by Pairot
It took me a while because I misread the rules, turns out the arrow always count shaded cells hehe.
Was super smooth after I adjusted. 1* if you are somewhat familiar with ying yang.
on 29. June 2026, 06:22 by Decapod
It took me a full 52 minutes, but I never felt like it was hopeless. Slow and steady, with a good flow for me. Nicely constructed, thank you.
