Territories Teaser
(Published on 18. February 2026, 13:30 by masetab)
Play the sudoku here:
Edit: the full 9x9 sudoku is also now published, you can play it here but note it is very hard:
Rules:
Sudoku: Fill the grid with digits 1–5 so that each digit appears exactly once in every row and column.
Regions: Divide the grid into regions of orthogonally connected cells such that every cell belongs to a region. Each region contains exactly one circle. The digit in a circle gives the size of its region. Digits may not repeat within a region.
If a circle contains digit n then exactly n-1 orthogonally adjacent regions (regions sharing an edge) must be smaller in size than that region.
View my puzzles from the Territories series:
- Consecutive Territories - Featured on CTC! (5/5 Difficulty):
Solve on Logic Masters - Non-Consecutive Territories - Featured on CTC! (5/5 Difficulty):
Solve on Logic Masters - Square Territories (5/5 Difficulty):
Solve on Logic Masters - Yin-Yang Territories (5/5 Difficulty):
Solve on Logic Masters - Counting Territories (4/5 Difficulty):
Solve on Logic Masters - Loopy Territories (5/5 Difficulty):
Solve on Logic Masters
Any feedback is welcomed!
Solution code: Digits in odd-sized regions in row 4 from left to right.
Comments
on 20. February 2026, 19:10 by dzamie
Judging from this puzzle, the bigger version is beyond my capabilities. This one was pretty nice, though! Maybe I'll give the example puzzles of the rest of the series a shot.
on 18. February 2026, 19:24 by JVA
I don't know about having a somewhat convoluted rule just to disambiguate the last two regions. I guess in the larger size puzzles it makes sense
on 18. February 2026, 14:56 by firespire
The harder long ones are beyond my ability/concentration span so love it when creators create mini playable examples that I can join in the fun. Thanks.
on 18. February 2026, 13:56 by Snookerfan
I usually don't try 1 star puzzles, but as a setup puzzle I did. Weird ruleset, can't wait for the big one, thanks!
