Regional Bat (Region sum lines/Battenburg sudoku)
(Published on 11. March 2024, 12:11 by sujoyku)
- Normal Sudoku rules apply.
- Region sum lines: Blue lines are region sum lines, i.e. the digits on a blue line sum to the same value in each 3x3 region the line passes through. Different region sum lines can sum to different totals. If a blue line enters a 3x3 region more than once, each segment has to be considered separately.
- Parity line: Adjacent digits on a red line must alternate between odd and even.
- Battenburg: Whenever 2 odd and 2 even digits form a 2x2 checkerboard pattern (e.g. R1C1 and R2C2 even, R1C2 and R2C1 odd), a Battenburg marking is given. If there is no such marking, the above pattern is not allowed.
Here you can solve the puzzle online:
Solution code: Column 9 from top to bottom (9 digits in total)
Comments
on 21. April 2024, 18:11 by RJW1985
Took me longer than I'd like to admit to see the relationship between the middle sum line and box 3 but once I did it was quickly solved. Very nice.
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Thank you for the comment, RJW1985! I am glad that you liked the puzzle. And do not worry about taking some time.
It so often happens to me that I miss some deductions that seem completely obvious in hindsight.
Kind regards, sujoyku
on 25. March 2024, 20:09 by Krokant
What a fun combination. :)
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Thank you for the comment, Krokant! It is nice to hear that you had a fun solve.
Kind regards, sujoyku
on 11. March 2024, 20:28 by marcmees
Nice. Thanks.
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Thank you for commenting, marcmees! Glad that you liked the puzzle.
Kind regards, sujoyku
on 11. March 2024, 18:38 by fuxia
Excellent puzzle. I never felt lost, there was always something left to explore. It took me a surprising long time to color the last box. Thank you!
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You are most welcome, fuxia, thank you for the comment! I am glad that you enjoyed exploring the different deductions in the solve.
Kind regards, sujoyku
on 11. March 2024, 15:44 by Fizz
Awesome and fun puzzle, thanks!
The interactions between the constraints worked really well, a very nicely thought out puzzle.
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Thank you for your kind feedback, Fizz! Setting this puzzle was great fun for me. Hence it is really nice to know that you enjoyed its solve.
Kind regards, sujoyku
