Keeping it between us
(Published on 21. March 2025, 14:17 by Fenners)
Another Construction puzzle with Yin-yang and between lines thrown in. Feedback appreciated and hope you enjoy!
Puzzle: Keeping it between us
Rules:
Place the digits 1-9 in each row, column and 9-cell region you construct.
Yin-Yang: Shade some cells such that all shaded cells are orthogonally connected and all unshaded cells are orthogonally connected. Additionally no 2x2 area of cells can be fully shaded or unshaded.
Between Lines: Digits on the lines between bulbs must be strictly in between the digits in the bulbs.
Chaos Construction: Bulbs on the same 'between line' share the same Yin-yang orientation. (Both shaded or both unshaded). A digit in a bulb indicates how many cells of the same shading orientation it can see in it's row and column, including itself. It cannot see past a shading of the opposite orientation. From the Yin-yang shading, construct nine 9-cell regions. Each region must be either fully shaded or fully unshaded.
Solution code: Column 1, top to bottom, 9 digits no spaces:
Comments
on 16. April 2025, 09:20 by Nemefish
Thoroughly satisfying. I find Chaos construction to be the end boss of Sudoku. Many chaos puzzles get bogged down during the irregular sudoku but I found this very smooth throughout.
on 2. April 2025, 22:59 by sirjames
Very satisfying
on 29. March 2025, 01:25 by Glasgow
Very nice!
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Thanks Glasgow! - Fenners
on 23. March 2025, 14:43 by LehanLehan
Very beautiful construction, thank you very much for the puzzle.
on 21. March 2025, 19:36 by sahi1l
I quite enjoyed the puzzle! I liked how it divided into three phases: finding the Yin-Yang, finding the regions, and then the endgame.
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Thank you! Glad you liked it — Fenners
