Yin Yang Whispers
(Published on 23. April 2024, 18:50 by BenTen)
I wanted to try my hand again at a yin yang puzzle. I find the middle portion gets a bit tricky so I raised to 4-star difficulty. Just remember the negative constraint, which can help resolve some digits. Let me know in the comments how you get on.
f-puzzles link
CTC app link
Rules:
- Normal sudoku rules: Place the digits 1-9 once each in every row, column, and 3x3 box.
- Yin Yang: Shade some cells such that all shaded cells are orthogonally connected and all unshaded cells are orthogonally connected and no 2x2 area may be fully shaded or unshaded.
- German whispers: For all shaded cells, any two orthogonally adjacent digits must have a difference of at least 5. Cells on the green line are shaded.
- Green dots lie on the border between one shaded and one unshaded cell.
- Kropki: A black dot indicates the two connected digits must have a ratio of 1:2. All possible black dots are given (negative constraint applies).
If you enjoy this puzzle, then please try my previous Yin Yang puzzle:
Chinese Takeaway - CTC solve on YouTube
Solution code: Row 3.
Comments
on 11. May 2024, 08:39 by Tank
Amazing puzzle wonderful deductions 74 min for me
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Thank you Tank, and decent time too. Well done!
on 11. May 2024, 02:29 by Tank
Amazing puzzle wonderful deductions 74 min for me
on 9. May 2024, 00:44 by elpadrinoIV
It was brutal, but I was more stubborn than the puzzle :D.
I started quite fast but that was it. 156 min of struggle and fun :D
Thanks for setting!
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Thank you. Haha well done for sticking with it till the end!
on 27. April 2024, 22:12 by LeaVulpina
What a lovely puzzle! Some tricky steps, but also quite a lot of me just failing to have made the eliminations from the colouring and/or the negative constraint xD. This was a joy!
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Thank you LeaVulpina.
on 26. April 2024, 12:42 by hgfe
74 mins, wonderful puzzle
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Thanks hgfe. A good time, I would say.
on 24. April 2024, 06:12 by yttrio
Fun puzzle! I'll echo the other comments saying that the negative constraint put in a lot of work, and the ending coloring was tricky, but satisfying to find a logical solution.
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Thank you yttrio.
on 24. April 2024, 03:29 by sanabas
Very good fun. Not too tough until the colouring at the very end.
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Thank you sanabas. I actually find the colouring part not so bad and the actual sudoku part tricky.
on 24. April 2024, 02:34 by Calvinball
Your negative restraints must be exhausted, they did a lot of hard work on that one. Very worthy follow up to Chinese Takeaway, I very much enjoy your yin yangs.
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Haha you're certainly right about those negative constraints!
Thank you Calvinball, that inspires me to create another yin yang in the future.
on 23. April 2024, 22:25 by wuc
What a blast. Incredibly clever solve path. 107 minutes of hard work but pure joy. Thx.
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Thank you wuc. 107 minutes is a fine time i think. Well done.
on 23. April 2024, 20:41 by Snookerfan
Brilliant puzzle! Great fun and full of lovely deductions. Thank you
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Thank you, I'm glad you enjoyed it :)
