Dueling Skyscrapers
(Published on 21. May 2025, 18:07 by yanggang)
Normal sudoku rules apply.
Yin Yang: Shade some cells such that all shaded cells are orthogonally connected, all unshaded cells are orthogonally connected, and no 2x2 area is fully shaded or fully unshaded.
Dual Skyscrapers: Each digit in the grid represents the height of a skyscraper in that cell. Digits outside the grid simultaneously indicate the number of shaded skyscrapers and the number of unshaded skyscrapers that can be seen from the direction of the clue. Skyscrapers hide shorter ones of the same type (shaded/unshaded) but not ones of the other type.
See the sample image for how the skyscrapers work.
Example for reference:
Solution code: Row 7
Comments
on 22. May 2025, 18:06 by Allagem
Very challenging but very satisfying. I loved it!
It’s amazing how this small handful of numbers is enough to force not only a unique Sudoku, but a unique Yin-Yang as well. Note that the Yin-Yang shading in rows and columns without clues is fully unrestricted! Excellent puzzle, yanggang :)
on 22. May 2025, 05:22 by bansalsaab
Phew. That was a tough one but logical throughout.
