Once in a Blue Moon
(Published on 12. August 2025, 10:38 by sujoyku)
Rules:
- Normal sudoku rules apply, i.e. each row, column, and 3x3 region has to contain the digits from 1 to 9 once each.
- Region Sum Lines: Box borders divide the blue lines into segments with the same sum. (Different lines may have different sums.)
Here you can solve the puzzle online:
Solution code: Column 1 from top to bottom (9 digits in total)
Comments
on 18. August 2025, 20:46 by damo_89
Very delicate construction, very enjoyable.
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Thank you, damo_89! I am glad you found it to be enjoyable.
Kind regards, sujoyku
on 15. August 2025, 23:48 by MSDOS
Just a fantastic pure RSL! Really enjoyable solve, great break in, thanks for sharing!
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You are much welcome, MSDOS, thank you for your comment! I am glad that you enjoyed the puzzle and liked its break-in.
Kind regards, sujoyku
on 14. August 2025, 00:07 by Playmaker6174
Sweet puzzle, it was a lot of fun chasing around the interactions throughout the solve :)
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Thank you for your comment, Playmaker6174! I am glad that you had a fun solve.
Kind regards, sujoyku
on 13. August 2025, 23:31 by Calvinball
Very nice puzzle! I shaded some cells orange, not because I needed to, but you can't have a Blue Moon without an orange!
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Thank you for your fun comment, Calvinball! I am glad you enjoyed the Blue Moon with the orange. :)
Kind regards, sujoyku
on 13. August 2025, 13:26 by polcat
Loved this! Thank you. I found it 2-3* -- the beginning was fairly straightforward but then I slowed down around the middle.
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You are much welcome, polcat, thank you for your comment! I am glad that you enjoyed the puzzle. Also thanks for sharing your perspective on the difficulty.
Kind regards, sujoyku
on 13. August 2025, 13:07 by ViKingPrime
"Can I offer you a nice RSL in this trying time?"
Why thank you, don't mind if I do.
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Thank you for your comment, ViKingPrime! I don't really know what to say. Am I missing a reference about the title? I even listened to a Country song, but still did not find out. :)
Kind regards, sujoyku
on 13. August 2025, 08:06 by Qodec
Very very well set.
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Thank you, Qodec! It is great to hear you liked the puzzle.
Kind regards, sujoyku
on 13. August 2025, 06:00 by RedBarchetta
Another stellar puzzle, well done! 3 star all the way for me. 89 was fun, but the 67 broke it for me.
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Thank you for your comment, RedBarchetta! I am glad that you enjoyed the puzzle. Also thanks for giving your take on difficulty!
Kind regards, sujoyku
on 13. August 2025, 04:18 by antiknight
Cute pure RSL puzzle! I think it's high 1* at most.
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Thank you for your comment, antiknight! I am glad that you liked the puzzle. Of course, difficulty is always subjective. I still think it is harder than 1 star, but it probably depends on how quickly you spot certain steps. Thank you for sharing your perspective!
Kind regards, sujoyku
on 12. August 2025, 21:42 by Piatato
Neat!
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Thank you, Piatato!
Kind regards, sujoyku
on 12. August 2025, 17:39 by PinkNickels
Beautiful! Well done!
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Thank you, PinkNickels!
Kind regards, sujoyku
on 12. August 2025, 16:21 by Adrian71
Lovely as always! A great solving experience, interesting until the end. I fully agree with the high 2 - low 3 stars estimate. Thank you for sharing!
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You are much welcome, Adrian71, thank you for your comment! I am glad that you liked the puzzle.
Kind regards, sujoyku
on 12. August 2025, 14:39 by AngusWBA
Found this one really tough but enjoyable. Thanks!
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You are much welcome, AngusWBA, thank you for commenting! I am glad you found the puzzle to be enjoyable. Considering difficulty: Going into testing, I was torn between (high) 2 or (low) 3 stars. Thanks for sharing your perspective!
Kind regards, sujoyku
on 12. August 2025, 14:21 by Mad-Tyas
Smooth and elegant!
**
Thank you, Mad-Tyas!
Kind regards, sujoyku
on 12. August 2025, 12:26 by Ragna
Fun puzzle! Very smooth. Thank you. :-)
**
You are much welcome, Ragna, thank you for your comment! I am glad you had a smooth solve.
Kind regards, sujoyku
on 12. August 2025, 11:07 by Morisenseiisgod
Great puzzle with a smooth path, pretty easy and enjoyable. Thanks for setting! I enjoyed how the 8 and 9 sums unwound.
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You are much welcome, Morisenseiisgod, thank you for your comment! The sums you mentioned were the core idea behind the set-up. I am glad that you enjoyed it.
Kind regards, sujoyku
