Chaos Construction: Yin Yang (9x9)
(Published on 22. May 2022, 10:39 by Jesper)
Rules
Divide the grid into regions, each consisting of nine orthogonally connected cells. Each row, column and region must contain the digits 1 to 9 once each.
Shade some cells, so these conditions are all fulfilled:
- All shaded cells are connected
- All unshaded cells are connected
- No 2x2 area is fully shaded or fully unshaded
- Each region is either fully shaded or fully unshaded
The digit in a cell with one or more arrows is equal to the total number of shaded cells that appear in the indicated directions combined.
Not all possible arrows/arrow combinations are given.
Example (6x6):
Penpa+: Example (6x6)
The puzzle follows:
Penpa+: Chaos Construction: Yin Yang (9x9)
-------
Solution code: Row 5 followed by column 5
Comments
on 20. October 2024, 22:29 by Piatato
Fantastic construction, thanks a lot!
on 23. September 2024, 00:34 by tallcat
Not done a lot of Yin Yang before but enjoyed this thoroughly!
on 21. February 2024, 22:18 by yttrio
All I can really do is echo the sentiments of the other solvers: this was an absolutely fantastic puzzle, and one of my favorite ones I've solved in a while!
on 9. October 2023, 19:37 by Snookerfan
Magnificent! Thank you
on 25. April 2023, 02:14 by Calvinball
After 2 evenings I've finally cracked it, I'm not sure if I've ever felt more proud to finish a puzzle. Brilliant and grueling, I also loved how smooth the irregular solve went after all the heavy lifting of the Chaos Construction and Ying Yang.
on 3. March 2023, 15:16 by abed hawila
What a masterpiece!
on 19. November 2022, 17:17 by meixia
This puzzle is incredibly good! I haven't got a clue how you were able to create that, let alone with such precision. And surprisingly, it wasn't as hard as I anticipated. Really great setting.
on 16. November 2022, 19:10 by peacherwu2
Very elegant logic!
on 17. July 2022, 19:03 by Lizzy01
This only took me an hour and 58 minutes. I'd say it's approachable...(!)
on 7. July 2022, 12:41 by Christounet
Outstanding ! A real treat from start to finish! It really helped that I have done other Yin Yang puzzles before, otherwiseit would have been a genuine nightmare. Loved the subtle break-in, and the way it all resolved in the end, even after almost all the clues had dried up... Thanks a lot !
on 7. July 2022, 12:02 by Crusader175
Good grief this one took me 3+ hours because of silly mistakes. Definitely one of the best & hardest puzzle that I ever solved.
on 7. July 2022, 03:40 by SimplePurpleFrog
5 hours!!!
on 6. July 2022, 22:39 by Agent
Very inpressive puzzle! It was always challenging but every deduction was fair. I loved the logic from start to end.
on 5. July 2022, 15:53 by Mody
Großartig, hat viel Spaß gemacht.
on 4. July 2022, 09:50 by TotallyNormalCat
Has science gone too far?
on 10. June 2022, 07:11 by Elliptical
exceptionally good and absolutely brutal. Thanks :)
on 29. May 2022, 11:00 by udukos
Wonderful puzzle! Thanks a lot, Jesper :)
on 27. May 2022, 19:57 by henrypijames
Challenging, but "only" 4 stars difficulty for me - after the very tricky start, the puzzle does gets easier as it progresses.
on 25. May 2022, 14:55 by Prutsbeest
Wow, what a puzzle! An amazing ruleset which works so nicely together! And very challenging all the way! I am definitely going to look at your other puzzles as well, Jesper. Thanks for setting this gem!
on 24. May 2022, 19:15 by marcmees
For a YY novice, quite a discovery with lots of fun. Thanks Jesper
on 24. May 2022, 11:45 by Jesper
Thanks for the wonderful comments, everyone! It makes me really happy that many solvers greatly enjoyed the puzzle.
on 24. May 2022, 00:24 by Niverio
What. A. Puzzle. 2 hours of pure joy, with moments of utter desperation. Exceptional.
on 23. May 2022, 18:52 by JayForty
Absolutely brilliant, thank you Jesper!
on 23. May 2022, 15:26 by laky
I think the example puzzle is more difficult than the official puzzle
EDIT @laky: Well, the example puzzle has a very specific break-in. If you spot it, I think it should be a relatively quick and smooth solve. But if you don't spot it, there will not be a reasonable logical path to solve the puzzle. Regards, Jesper
on 22. May 2022, 22:16 by kolot
Absolutely wonderful puzzle. Consistently challenging with very beautiful deductions on the way. I especially loved the final part, the part after almost all the arrow clues were used. Also, the 6x6 example is itself a very beautiful puzzle.
on 22. May 2022, 21:38 by harrison
Masterful!
on 22. May 2022, 20:56 by KNT
sensationally good. thanks so much for this
on 22. May 2022, 18:18 by Vebby
Brilliant! Really enjoyed testing this puzzle. Very creative and interesting idea for a chaos construction. Thanks Jesper!
on 22. May 2022, 18:17 by Playmaker6174
I was so excited when I saw another C.C puzzle from you but my goodness, that's one of the hardest puzzles I've solved from you.
Consistently challenging, yet absolutely beautiful throughout the solve: from the lovely break-in to the regions configuration at the end, everything works so well together. My heart nearly skipped a beat when I found the final breakthrough as well xD
