Sudoku Variants Series (463) - Borderland
(Published on 17. April 2026, 06:00 by Richard)
For this Sudoku Variants Project I have planned to publish a unique Sudoku variant every week.
Borderland
Inspiration for this type comes from Sudoku Grand Prix 2026 Round 3 (Thailand).
Solve online in Sudokupad.
I will see how long it takes before I am running out of ideas.
Apply classic sudoku rules.
A cell with a diamond is part of a group of horizontally and vertically connected cells containing digits of the same parity (odd or even). The digit in the cell with the diamond indicates the total number of cells in the corresponding region. There may be multiple cells with a diamond in the same region. Not all possible diamonds are necessarily given.
Solution code: Row 9
Comments
on 21. April 2026, 11:05 by Eisbär
@ toundrah: Please hide your comment!
on 21. April 2026, 10:01 by toundrah
It's misssing something like : If two orthogonaly cells share the same parity, they belong to the same region
Otherwise, it's a nice puzzle.
on 20. April 2026, 17:24 by toundrah
I is not indicated that all the cells in the grid must be part of a region.. is it ?
---
Reply: Indeed, not every cell must be part of a defined region.
on 18. April 2026, 21:11 by damo_89
More challenging than expected including one restart, but very fun to figure out.
on 18. April 2026, 17:32 by ElenaMonteille
Oops... I had some serious missunderstanding of the rules. I did't realize that the regions actually cover the whole grid; or so to say the connected cells of the same parity form the regions. Stuck for quite some time because of this. I was even thinking "maybe the regions can overlap with each other"... XD Until I checked the solution in the provided link, and then I was finally able to enjoy this beautiful puzzle :D
on 18. April 2026, 14:16 by Franjo
Thank you very much for creating and sharing another beautiful SVS-puzzle. Interesting constraint!
on 17. April 2026, 23:14 by dzamie
That's pretty neat!
on 17. April 2026, 20:09 by Flinty
Very nice. I've found the last two puzzles in your series quite approachable. Maybe I'm just getting lucky - haha.
on 17. April 2026, 15:57 by Lizzy01
Very nice!
on 17. April 2026, 11:45 by Narayana
I love this variant! It's a Parity Fillomino.
on 17. April 2026, 06:33 by Piatato
Lovely! Slightly harder than I expected, and a lot of fun to figure out!
