Bad Thermburg (Battenburg thermo sudoku)
(Published on 15. November 2023, 22:53 by Qodec)
- Sudoku: Each row, column, and region indicated by thick borders in the grid must contain the digits 1 to 9 once each.
- Thermometers: Grey paths indicate thermometers. Digits in thermometers cannot repeat and increase moving away from the bulb.
- Battenburg: Wherever 2 odd and 2 even digits form a 2x2 checkerboard pattern, a Battenburg marking is given. If there is no such marking, the above pattern is not allowed.
You can play this puzzle online using:
- Sudokupad: http://tinyurl.com/ebxd5chp
- Penpa+: https://tinyurl.com/3bracfrn
Good luck!
Solution code: Row 9 and column 9. I.e. the 9 digits in row 9 from left to right, followed by the 9 digits in column 9 from top to bottom, for example: 123456789123456789
Comments
on 11. March 2026, 22:00 by Djirt
Спасибо, великолепный пазл!
on 22. May 2025, 10:28 by StGordo
Such a pleasure to solve, everything was so intricately interwoven, yet still approachable for an intermediate ( at best) solver. Very enjoyable
on 31. March 2024, 07:28 by Willy Wonka
Great fun, thanks Qodec!
on 17. February 2024, 19:45 by Phistomefel
The Battenburg negative constraint is surprisingly strong. Very nice combination!
on 17. February 2024, 12:25 by sujoyku
Thank you for this beautiful puzzle, Qodec! The Battenburg constraint is very interesting. I have given 4/5 difficulty. But while being challenging the flow of logic felt so motivating that when I ever I got a little stuck I was sure to find another bit of logic that would allow me to move on. Thank you for setting and sharing!
on 19. December 2023, 14:03 by Crusader175
Very nice puzzle and cool interaction!
on 17. November 2023, 23:49 by Krokant
Haven't done a Battenburg puzzle for quite a while. This was fun. :)
on 17. November 2023, 21:31 by jubengo
Very cool puzzle ! Seems more like a 2 star puzzle to me, but really enjoyable nonetheless
on 17. November 2023, 19:40 by anyeyeball
Very fun puzzle to solve. I had never done a puzzle with a Battenburg parity constraint before. Thanks for sharing this!
on 17. November 2023, 16:12 by madhupt
The negative constraint works wonder in this extremely enjoyable puzzle. Thanks for sharing.
on 17. November 2023, 02:33 by mathpesto
What a fabulous ruleset! The negative constraint made for a very fun solve :)
on 16. November 2023, 16:09 by Barrels
Very nice puzzle - I really enjoyed it!
on 16. November 2023, 12:34 by Blashyrkh
Cool ruleset, with sudoku/thermo/parity logic all cleverly intertwined throughout the solve. Thanks for setting!
on 16. November 2023, 08:26 by fitzie
I think this is two stars. very enjoyable.
on 16. November 2023, 07:17 by EmpyClaw
I suspect if I had done this while I was more awake and alert I wouldn’t have missed so many straightforward deductions, haha! Great fun despite my foolishness. Thanks for setting!
on 16. November 2023, 03:57 by topoi
Cool constraints, interesting challenge.
on 15. November 2023, 23:56 by Playmaker6174
You couldn’t just proceed to battenburg the entire grid like that… that was such a cool puzzle :0
on 15. November 2023, 23:46 by Myxo
Beautiful puzzle!
on 15. November 2023, 23:46 by Niverio
Very nice use of the negative constraint!
