It's Just Sum Shading (Yin Yang)
(Published on 13. May 2025, 01:43 by EnPee)
I hope you enjoy solving the puzzle!
Rules
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.
The shaded cells act as a Region Sum line: 3x3 box borders divide shaded cells into orthogonally connected segments with the same sum.
Digits in a cell with a black arrow count the total number of shaded cells in the direction of the arrow (not counting the cell itself).
Digits in a cell with a white arrow count the total number of unshaded cells in the direction of the arrow (not counting the cell itself).
Note: if a cell with digit N has multiple arrows, then each black arrow points to N shaded cells and each white arrow points to N unshaded cells.
Solution code: Unshaded cells in row 7 (left to right) followed by unshaded cells in row 8 (left to right)
Comments
on 16. May 2025, 04:10 by fitzie
after I solved on the pattern and the region sum, I just restarted from a blank grid to clear my mind and focus on filling in the grid.
- Thank you very much for solving, hope it was enjoyable!
on 15. May 2025, 12:38 by ElimGarak
Very nice interactions of the different rules.
- Glad you enjoyed playing with these rules, thank you!
on 14. May 2025, 20:16 by Exigus
That was very nice, thanks!
- Thank you, glad you enjoyed it!
on 13. May 2025, 22:38 by AKernel
Wonderful puzzle. Highly recommended.
- Thank you so much!
on 13. May 2025, 17:44 by thoughtbyte
Fantastic puzzle! Very fun and smooth, thank you!
- Glad you enjoyed the solve path, thank you!
on 13. May 2025, 12:40 by oskode
Really cool puzzle!
- Thank you very much!
on 13. May 2025, 09:23 by yttrio
Very fun puzzle! I'm always really glad when someone gets inspired by one of my puzzles :)
- Thank you for the inspiration for this puzzle and I'm happy that you enjoyed solving it!
on 13. May 2025, 05:26 by Elliott810
Brilliant puzzle! Thank you:)
- Thank you, glad you enjoyed it!
on 13. May 2025, 03:58 by Md88keys
Great puzzle! I liked the way the Yin yang rules and region sum rules worked together to move the solve forward.
- Thank you very much, glad you enjoyed the ruleset!
