Logic Masters Deutschland e.V.

Regional Bat (Region sum lines/Battenburg sudoku)

(Published on 11. March 2024, 12:11 by sujoyku)

The title of this puzzle has no deeper meaning than the point that the region sum lines to me kind of resemble a bat. The puzzle combines the Battenburg constraint with region sum lines which allows for some nice interactions. Again, I am grateful to CaptZebraCakes for testing the puzzle. Please feel free to write in the comments how you like the variant. I wish you joyful solving!

- 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:

Solve on CtC

Solution code: Column 9 from top to bottom (9 digits in total)

Solved by creo, Fizz, Mr_tn, SKORP17, tuturitu, mihel111, teuthida, fuxia, marcmees, seeppp, CaptZebraCakes, lianarox, Brodie2000, farodin64, asver, Iluvsodah, OutOfMyMindBRB, by81996672, trashghost, Willkimo, ... Carolin, sorryimLate, Krokant, XIAOYING, Illuminated, Julianl, RJW1985, cryptique, PippoForte, humaLautema, liushong, zrbakhtiar, elloschmello, joelth, lovely, karen_birgitta, cmigas
Full list

Comments

Last changed on 21. April 2024, 20:26

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.

**
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

Last changed on 25. March 2024, 20:45

on 25. March 2024, 20:09 by Krokant
What a fun combination. :)

**
Thank you for the comment, Krokant! It is nice to hear that you had a fun solve.
Kind regards, sujoyku

Last changed on 11. March 2024, 20:33

on 11. March 2024, 20:28 by marcmees
Nice. Thanks.

**
Thank you for commenting, marcmees! Glad that you liked the puzzle.
Kind regards, sujoyku

Last changed on 11. March 2024, 19:07

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!

**
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

Last changed on 11. March 2024, 15:51

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.

**
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

Difficulty:3
Rating:91 %
Solved:55 times
Observed:8 times
ID:000H9J
Sudoku, Battenburg (Variant), Region Sum Lines (Variant), Parity (Theme)

Enter solution

Solution code:

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