Yin-Yang Territories
(Published on 3. January 2026, 13:01 by masetab)
Creating this puzzle involved a few different iterations and rule changes before I landed on something I was happy with. Hope you enjoy!
Play the sudoku here:
Rules:
Sudoku rules apply: Fill the grid with digits 1–9, so that each digit appears exactly once in every row and column.
Yin-Yang: Shade some cells such that both the shaded and the unshaded cells are orthogonally connected and no 2×2 square is either fully shaded or entirely unshaded. Some shaded cells are given in grey.
Divide the grid into regions consisting of orthogonally connected cells such that every cell belongs to a region. Each region contains exactly one circled cell and the number inside the circle gives the size of its region. No digit may repeat within a region.
Each region must consist of entirely shaded or unshaded cells. All shaded regions have the same digit sum; this common sum is not given and must be deduced.
A blue dot between two cells indicates they belong to different regions. A white dot between two cells indicates the digits in those cells are consecutive. Not all possible dots are provided.
An arrow outside the grid gives the sum of the digits along the indicated diagonal.
Example Completed Puzzle with this Ruleset:
View my other puzzles in this series:
- Consecutive Territories - Featured on CTC! (5/5 Difficulty):
Solve on Logic Masters - Non-Consecutive Territories (5/5 Difficulty):
Solve on Logic Masters - Square Territories (5/5 Difficulty):
Solve on Logic Masters
Any feedback is welcomed!
Solution code: Unshaded digits in row 6 from left to right
Comments
on 1. February 2026, 15:05 by Snookerfan
Amazing puzzle with a very original ruleset! Keeps challenging all the way through, very enjoyable. Thanks
on 22. January 2026, 15:31 by WvdWest
Once in a while you regret that there is no 6 star rating available to express de excellence of a puzzle. This is one of these puzzles.
on 19. January 2026, 14:28 by gfoot
Nice logic all through, great complementary interactions between the rules
on 19. January 2026, 00:07 by j-man
very rewarding solve, it took me so long but i am glad i kept going. thank you for the puzzle!
on 14. January 2026, 14:37 by mir85
My favorite of the series! Love both Yin-Yang and chaos construction, so this was a nice combo :)
on 13. January 2026, 05:13 by waffles_the_dog
I really enjoyed the break in and found it almost approachable, but I found the tail of the puzzle extremely difficult, I'm convinced I missed some detail :(
Aside from that bit where I just got stuck I found this puzzle to be exceptionally enjoyable.
Thanks!
on 10. January 2026, 15:44 by SennyK
Took me so long, but I am happy I did not give up, wonderfull puzzle with great logic, very rewarding, thank you for sharing this gem!
on 9. January 2026, 08:26 by Norkas
Pretty hard while offering interesting logic and never being too finicky. Another great one in this series.
on 8. January 2026, 21:53 by War
Exceptional puzzle, and great series. I kept messing up my break-in by coloring blue dot borders as different Yin-Yang colors, not different regions. The rest of the puzzle was tough too.
on 5. January 2026, 10:24 by Guvenistan
This is one of the greatest series of puzzles ever. The setting for the endgame was particularly brilliant.
on 3. January 2026, 22:20 by marcmees
very tough but fair. Rewarding solve. Thanks
