Encore (Region Sum Lines + Up to N)
(Published on 20. September 2025, 10:00 by sujoyku)
I like to thank all testers and wish you joyful solving!
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.)
- Up to N-sums: A clue outside the Row or Column N indicates the sum of all digits up to the cell that contains the digit N. (The digit N itself is not included in the sum.)
Here you can solve the puzzle online:
Solution code: Column 9 from top to bottom (9 digits in total)
Comments
on 8. November 2025, 23:10 by Lenivaya_Joppa
Thank you for this nice puzzle, dear sujoyku! At first I had problems to understand the Up-to-N rule. I think it would be helpful if you add an example in the explanation of the rules to explain it more concretely.
Once I had understood the rule I really liked the solve! Thank you! :)
**
You are much welcome, Lenivaya_Joppa, thank you for your comment! I am glad that you enjoyed the puzzle. I used to include examples in the first Up to N-puzzles I posted. Maybe I should not have stopped doing that. Thank you for the suggestion!
Kind regards, sujoyku
on 7. October 2025, 11:19 by Christounet
To answer the previous comment, even if you peeked behind the curtain like I did a few years ago, it still feels like magic to me :) And yeah, quite an addictive hobby indeed!
Interesting constraint and fun puzzle! Thanks :)
**
Thank you for your comment, Christounet! I am glad that you enjoyed the puzzle. And I agree 100%, setting can feel magic, especially when things suddenly work out or allow for logic one had not even hoped for.
Kind regards, sujoyku
on 27. September 2025, 19:55 by rhodri
A preposterously beautiful construction. Sometimes I consider learning how to set sudoku puzzles, but part of me doesn’t want to peek behind the curtain. It feels like magic to me. Thanks again
**
You are much welcome, rhodri, thank you for your kind words! I am glad that you liked this construction. Considering setting: If you ever set a puzzle, let me know so I can try it. But be warned: it can become as (or even more?) addictive than solving puzzles. :)
Kind regards, sujoyku
on 23. September 2025, 00:45 by Playmaker6174
Indeed it got quite trickier towards the end but that was still a sweet and fun solve overall, thanks!
**
You are much welcome, Playmaker6174, thank you for your comment! I am glad you had a fun solve.
Kind regards, sujoyku
on 21. September 2025, 18:11 by yusuf17
Great puzzle, 42 minutes.
Indeed, the break-in is not so difficult, but then the middle section is more difficult, hard work and then all of sudden you race to the end.
**
Thank you for your comment, yusuf17! I am glad that you enjoyed the puzzle.
Kind regards, sujoyku
on 21. September 2025, 13:54 by Franjo
Ich kannte auch nicht genug davon bekommen, ich meine, von deinen herrlichen Rätseln! Vielen Dank für ein weiteres tolles Puzzle.
**
Sehr gern geschehen, Franjo, vielen Dank für deinen Kommentar! Es ist toll, dass Dir das Rätsel so gut gefallen hat.
Herzliche Grüße, sujoyku
on 21. September 2025, 08:21 by superkinkel
Liked it a lot, in particular that the break-in is easier and it get‘s tougher later - at a point where it‘s become less intimidating. I think it can be rated 3 stars for difficulty, while the break-in is only two. It took me an age to see to see the single in r8c8 …
on 21. September 2025, 08:21 by superkinkel
Liked it a lot, in particular that the break-in is easier and it get‘s tougher later - at a point where it‘s become less intimidating. I think it can be rated 3 stars for difficulty, while the break-in is only two. It took me an age to see to see the single in r8c8 …
**
Thank you for your comment, superkinkel! I am glad that you liked the puzzle. I completely agree with your assessment of difficulty: It starts off easier and then gets harder towards the righthandside.
Kind regards, sujoyku
on 21. September 2025, 07:55 by chinesemaster
Thank you so much for this! I also could not get enough of Up to N puzzles. I will solve every single one until maybe a 5-star Up to N puzzle!
**
You are much welcome, chinesemaster, thank you for your comment! I love to set with Up to N clues, so it is great to hear you enjoy solving them.
Kind regards, sujoyku
on 21. September 2025, 06:44 by Hengist
Another one of these! Great flow once again, it's a good formula.
**
Thank you for your comment, Hengist! I am glad you enjoyed the puzzle's flow.
Kind regards, sujoyku
on 21. September 2025, 01:08 by PinkNickels
First up to N-sums puzzle I've done and I am glad it was. Very nice execution using the RSLs in conjunction. Really enjoyable solve, thank you.
**
You are much welcome, PinkNickels, thank you for your comment! If you liked the Up to N-variant, there are a few more. :) I am glad you enjoyed the solve.
Kind regards, sujoyku
on 20. September 2025, 21:46 by MSDOS
Really nice set up here, wonderful puzzle, good balance of logic, thanks for sharing!
**
You are much welcome, MSDOS, thank you for your comment! It is great to hear that you enjoyed the puzzle.
Kind regards, sujoyku
on 20. September 2025, 15:37 by wuc
Very smooth and fun puzzle. 2* to me. One or two fairly hidden singles. Great setting thx.
**
You are much welcome, wuc, thank you for your comment! I am glad you had a smooth solve.
Kind regards, sujoyku
on 20. September 2025, 14:57 by Myxo
Lovely!
**
Thank you, Myxo! I am glad you liked it.
Kind regards, sujoyku
on 20. September 2025, 14:07 by VitP
anyone familiar with this variant will find it easy. beginners will be challenged but not excluded.
--> level 2
**
Thank you for commenting, VitP! As I said below, I think this is somewhat on the edge between 2 and 3 stars. So I am fine with either difficulty rating.
Kind regards, sujoyku
on 20. September 2025, 13:52 by Adrian71
Another beauty! Thank you sujoyku for consistently treating us with high quality and entertaining puzzles!
**
You are much welcome, Adrian71, thank you for your comment! It is great to hear that you enjoy my puzzles.
Kind regards, sujoyku
on 20. September 2025, 12:51 by Piff
Great puzzle, had a very fun chain of interactions on the right three columns i really liked
**
Thank you, Piff! I am glad that you liked the puzzle. Without going into details, I think you have found exactly what I had intended over there. :)
Kind regards, sujoyku
on 20. September 2025, 12:14 by zonny
Very approachable, pleasant and smooth! Cheers!
**
Thank you for your comment, zonny! It is great to hear you found the puzzle to be pleasant and smooth.
Kind regards, sujoyku
on 20. September 2025, 11:46 by marcmees
Very nice. Starts as a 2*, ends closer to 3*. Thanks
**
You are much welcome, marcmees, thank you for commenting! I am glad you enjoyed it and I agree with your described progression of difficulty.
Kind regards, sujoyku
on 20. September 2025, 10:41 by Snookerfan
Extremely smooth puzzle, I guess 2 stars for difficulty. A very enjoyable solve. Thank you!
**
You are much welcome, Snookerfan, thank you for your comment! I am glad you had a smooth solve. Concerning difficulty: Some testers also had it at 2 stars. I was unsure about some of the later steps, so I uploaded it at 3 anyways. If it gets voted down to 2 stars, I won't object. :)
Kind regards, sujoyku
