XV-constraint Sudoku Snack (Irregular 7x7 sudoku)
(Published on 20. January 2023, 22:17 by sujoyku)
- Normal irregular 7x7 Sudoku rules apply, i.e. each row, column and region has to contain the digits from 1 to 7.
- XV-constraint: Orthogonally adjacent digits NEVER sum to either 5 or 10.
Here you can solve the puzzle online:
Solution code: Row 7 followed by Column 7, from left to right resp. from top to bottom (14 digits in total)
Comments
on 8. December 2024, 05:23 by MattYDdraig
The negative constraint was incredibly powerful in this puzzle!
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Thank you for your comment, MattYDdraig! I am glad you liked the implications of the negative constraint in this one.
Kind regards, sujoyku
on 2. August 2023, 08:34 by Cyrion
Ein richtiges Sudoku Snack :-)
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Danke für deinen Kommentar, Cyrion! Ich finde auch bei Rätseln, darf es mal ein Snack zwischendurch sein. :)
Ich hoffe, das Rätsel hat Dir Spaß gemacht.
Viele Grüße, sujoyku
on 28. June 2023, 18:39 by Lenivaya_Joppa
Nice puzzle, thank you, sujoyku! :)
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Thank you for commenting, Lenivaya_Joppa! I am glad that you enjoyed the puzzle.
Kind regards, sujoyku
on 23. February 2023, 23:31 by keeb
that was really fun thank you
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You are welcome, keeb! I am glad that you enjoyed the puzzle.
Kind regards, sujoyku
on 28. January 2023, 00:54 by JemTB
Wonderful puzzle, I believe it can be solved with just the negative V constraint btw (I didn't read the rules fully and still got a solution)
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Thank you for your comment, JemTB! I am glad that you enjoyed the puzzle.
You might be right that only the V-constraint is necessary. With the full XV-constraint it should be solvable a little easier I guess.
Kind regards, sujoyku
on 22. January 2023, 21:52 by brennan77
Had the hardest time with this puzzle, and bifurcated my way to a solution. Revisited it and saw the XV Constraint. that makes it much easier! great puzzle!
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Thank you for commenting, Brennan77! Actually, I am a little surprised since I did not think that the puzzle had a unique solution without the XV-constraint.
on 22. January 2023, 17:17 by NoHatHatter
I'm a beginner looking to get into sudoku variants and I really liked this puzzle as a gateway. Good logic and easy to get started.
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Thank you for your comment, NoHatHatter! I am happy that the puzzle was fun for you. I wish you best of luck and enjoyment in your next sudoku variants.
on 21. January 2023, 23:00 by the_fow_fow
Thank you for the puzzle.
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You are welcome, the_fow_fow. I am glad you enjoyed the puzzle.
on 21. January 2023, 13:56 by anyeyeball
I liked this one. Very nice, and an interesting break from the usual rules.
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Thank you for your feedback, anyeyeball! I am happy that you liked the rule set.
Kind regards, sujoyku
on 21. January 2023, 13:00 by RussKozerski
Good primer on negative constraints. At first blush, it looked like it might be harder. But the logic path flowed well. Very nice. Thank you.
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Thank you for your comment, RussKozerski! I am glad that you enjoyed the puzzle.
Kind regards, sujoyku
on 21. January 2023, 05:26 by Nordy
A perfectly blended introduction to both irregulars and negative constraints
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Thank you for your kind words, Nordy! I am glad that you like the puzzle and deem it a worthy introduction.
Kind regards, sujoyku
