Almost Correct
(Published on 23. August 2025, 16:53 by TVDK)
Normal 9x9 sudoku rules apply.
Yin Yang: Shade some cells such that all shaded cells are orthogonally connected and all unshaded cells are orthogonally connected and no 2x2 area is fully shaded or unshaded.
Knapp-Daneben: Clues in the shaded area have a value that is off by +-1. E.g. a killer cage with a clue 15 would actually sum to 14 or 16, or an X sums to 9 or 11. (Clues in the unshaded area are completely normal)
Each clue is contained within a single shading/colouring.
Killer: Digits in a cage sum to the total given.
Arrow: Digits along the arrow sum to the total in the bulb.
XV: Digits separated by a V sum to 5. Digits separated by an X sum to 10. Not all XVs are given.
Clarification: An arrow and its bulb are within the same shading. A Knapp Daneben arrow has a bulb that is +-1 from the sum of the digits on the arrow. Different arrows from the same bulb can have different sums.
Sudokupad: https://sudokupad.app/y2ko0a3u6j
Solution code: Digits in the shaded region (Knapp-Daneben) in row 4.
Comments
on 11. September 2025, 12:09 by VitP
seems unreasonable to call this a level 3. the middle game is much harder than that
on 28. August 2025, 04:45 by mariban
The rules are still unclear!
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Can you elaborate on how and where the rules are still unclear?
on 26. August 2025, 20:36 by Flinty
Lovely puzzle!
on 25. August 2025, 10:06 by TVDK
Clarified rules
on 25. August 2025, 08:59 by tim_1898
Like already mentioned, i feel like arrows would need some more explanation how it is affected by the shaded area.
on 24. August 2025, 18:38 by Snookerfan
Great puzzle! Thank you
on 24. August 2025, 18:36 by greemi01
wow!
on 24. August 2025, 15:46 by Franjo
Wonderful puzzle, though I had some trouble with the ruleset. For example, if an arrow is (fully) shaded, then ONLY the circle‘s value is Knapp Daneben, but not the values on the arrow. Well, this wasn’t obvious for me when I started the solve… Anyway, thank you for creating and sharing this lovely puzzle.
on 23. August 2025, 18:47 by mathpesto
Had a lot of fun with this one!
on 23. August 2025, 18:46 by TVDK
Fixed solution code.
on 23. August 2025, 17:09 by Agent
Great fun and very smooth!
