I'm Blue
(Published on 12. May 2025, 15:55 by sujoyku)
I like to thank all testers and wish you joyful solving!
Here you can watch how Mark of Cracking the Cryptic solves the puzzle.
- 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 9 from top to bottom (9 digits in total)
Comments
on 8. August 2025, 14:21 by MikeMeech
Fantastic puzzle. Loved all of the cool deductions using such a short rule set.
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Thank you for your comment, MikeMeech! I am glad that you enjoyed the puzzle.
Kind regards, sujoyku
on 20. June 2025, 18:19 by morgannamodeaura
is this broken for anyone else? there are absolutely no lines when i open up the puzzle.
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Hey morgannamodeaura, that is strange. For me the link is still working fine. Is anybody else having the same problem?
Kind regards, sujoyku
on 11. June 2025, 15:46 by sujoyku
added a link to the CTC video, no changes to contents of the puzzle
on 11. June 2025, 13:41 by wuc
I tried to speedrun the ctc solve. I was beat by far. One step around half was very tricky for me. Therefore 3.5* for me. The construction is brilliant. I loved every minute thx. Now I watch mark :-)
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Thank you for your comment, wuc! I am glad that you enjoyed the puzzle.
Kind regards, sujoyku
on 11. June 2025, 12:35 by LNOMISL
Nice puzzle, done it in 57min. Find it kinda hard to figure out a real patern, I'm not sure it did it the intended way but it was still satisfaying
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Thank you for your comment, LNOMISL! I am glad that you found the puzzle to be satisfying. If you like to discuss some of the steps of my intended solve path, feel free to leave a hidden comment.
Kind regards, sujoyku
on 22. May 2025, 03:16 by SamuPiano
This puzzle flows beautifully and has incredible symmetry! It feels like a miracle that everything resolves as smoothly and as fairly as it does!
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Thank you for your comment, SamuPiano! I am glad you enjoyed the puzzle's flow. The setting also came together incredibly smoothly. I had the break-in in mind before putting things into the grid and only had to work a bit more to get the last line (you can probably guess which) right. It is cool that this also reflects in the solving experience somehow.
Kind regards, sujoyku
on 20. May 2025, 00:53 by Lenivaya_Joppa
Thank you for this nice puzzle, dear sujoyku! :)
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You are much welcome, Lenivaya_Joppa, thank you for your comment! I am glad you enjoyed this puzzle.
Kind regards, sujoyku
on 18. May 2025, 18:22 by GeorgeTheToad2
Not sure how I missed this beautiful construction. Very intricate and quite hard but very satisfying. Thank you for bringing so much joy to the sudoku community Sujoyku.
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Thank you for your kind comment, GeorgeTheToad2! I am glad that you liked the puzzle. As I love to set my puzzles, it means a lot to me that they also bring joy to others.
Kind regards, sujoyku
on 15. May 2025, 20:48 by MSDOS
What a fantastic puzzle! It held on right until the end. Wonderful challenge!
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Thank you for your comment, MSDOS! It is great to hear that you enjoyed it.
Kind regards, sujoyku
on 15. May 2025, 07:28 by antiknight
Amazing break-in and some lovely deductions afterwards! Great puzzle.
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Thank you for your comment, antiknight! I am glad you liked the break-in and enjoyed the solve.
Kind regards, sujoyku
on 14. May 2025, 10:25 by rhodri
This puzzle is like magic to me. Just a glorious series of “wow” moments. I kinda never wanted it to end (although I’m glad I solved it.)
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Thank you for your comment, rhodri! It is great to hear you enjoyed the puzzle. I could not have hoped for a better solving experience.
Kind regards, sujoyku
on 13. May 2025, 10:38 by Franjo
Ein lupenreines RSL-Puzzle sieht man nicht mehr so oft, und dieses hier ist ein wahres Kunstwerk! Vielen Dank für das wunderschöne Stück!
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Sehr gern geschehen, Franjo, vielen Dank für deinen Kommentar! Es ist toll zu hören, dass Dir das Rätsel gefallen hat.
Herzliche Grüße, sujoyku
on 13. May 2025, 10:26 by damo_89
Wow if you look in the wrong place this gives up nothing, but when you look in the right place it all starts to crumble bit by bit. Amazing that resolves with no additional dot or given or inequality. Delightful.
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Thank you for your comment, damo_89! I am glad that you enjoyed the puzzle. I think it is not even that hard (I had put it at 2/5 initially), but as you say, it is about asking the right questions.
Kind regards, sujoyku
on 13. May 2025, 03:33 by Spider
Delightful. I was making deductions just for the sake of following a thread that felt clever, which often seemed to have nothing to do with the solve path, and every one ended up mattering to how it all flows together. Thanks a bunch for this!
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You are much welcome, Spider, thank you for your comment! It is great to hear you had a delightful solve.
Kind regards, sujoyku
on 12. May 2025, 23:35 by Qodec
Solves like butter. Very polished puzzle, thanks!
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Thank you for your comment, Qodec! I am glad you enjoyed the puzzle.
Kind regards, sujoyku
on 12. May 2025, 20:51 by Calvinball
Green 4 life!
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We were friends, but then came the colour prompt ... :D
Thank you for commenting, Calvinball!
on 12. May 2025, 19:50 by Wuschel
very nice
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Thank you for commenting, Wuschel! I am glad that you liked the puzzle.
Kind regards, sujoyku
on 12. May 2025, 19:48 by aqjhs
dabadi dabada
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Yay! Thank you, aqjhs!
on 12. May 2025, 18:32 by AnebodaSlatorp
Thanks lots
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You are much welcome, AnebodaSlatorp, thank you for your comment!
Kind regards, sujoyku
on 12. May 2025, 16:05 by ChinStrap
It flows super nicely and uses every part in slightly surprising but very fair ways. Loved it!
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Thank you for your kind words, ChinStrap! I am glad that you liked the puzzle. And thanks again for suggesting this nice colour choice.
Kind regards, sujoyku
