- Normal sudoku rules apply, i.e. each row, column, and 3x3 region has to contain the digits from 1 to 9 once each.
- Tenline Loop: Draw a one-cell wide loop into the puzzle. The loop may only move orthogonally from cell to cell and must not touch itself neither orthogonally nor diagonally.
Moreover, the loop acts as a Tenline, i.e. it can be split into contiguous, non-overlapping segments that sum to exactly 10.
- Loop sum clues: Clues outside the grid indicate the sum of all digits ON THE LOOP in the respective row or column. (Digits that are not on the loop do not contribute to the sum.)
- Connecting Kropki: Cells joined by a white dot must contain consecutive digits. Moreover, exactly one of the cells is on the loop and the other is not.
Cells joined by a black dot must contain digits with a 1:2 ratio. Moreover, either both cells lie on the loop or they both do not. (Not all dots are given.)
Here you can solve the puzzle online:
Solution code: Digits on the loop in Row 4 from left to right
on 22. July 2025, 17:53 by Snue
Very nice puzzle - I enjoyed it a lot :)
It was so fun figuring out where the loop went. Thanks for the puzzle :)
**
You are much welcome, Snue, thank you for your comment! I am glad you enjoyed the loop-drawing.
Kind regards, sujoyku
on 20. July 2025, 17:53 by davidz32z
Lovely puzzle! I'll have to take everyone's word that the break in was great, I remember it took me forever to get a digit, but this was a 3 day (150 minutes) solve for me so I don't even remember at this point. The whole puzzle was very nice, I really enjoyed it :)
**
Thank you for your comment, davidz32z! I can definitely relate: Sometimes I ask myself at the end of a challenging solve "How did I solve this?". :)
Thank you for sticking with the puzzle! I am glad that you enjoyed it.
Kind regards, sujoyku
on 18. July 2025, 21:33 by cowabunghole
I think this may have been my first time solving a 3* without hints or bifurcation. And it took me about an hour which normally would be long enough that I get frustrated and give up without making progress.
So what I'm saying is that this was a fantastic puzzle that was clever and challenging without ever feeling frustrating or unfair. Amazing!
**
Congratulations, cowabunghole, and thank you for your comment! I am glad that you enjoyed the puzzle.
Kind regards, sujoyku
on 17. July 2025, 16:31 by MattYDdraig
Very clever and tricky break-in, then a strong flow with the line after that. I really liked the kropki/loop restriction.
**
Thank you for your comment, MattYDdraig! I am glad you enjoyed the puzzle and liked the Connecting Kropki constraint.
Kind regards, sujoyku
on 16. July 2025, 21:57 by BorisP2101
Wow that break-in was amazing! Thank you for this nice puzzle :)
on 16. July 2025, 21:49 by BorisP2101
Wow that break-in was amazing! Thank you for this nice puzzle :)
**
You are much welcome, BorisP2101, thank you for your comment! It is great to hear that you liked the puzzle.
Kind regards, sujoyku
on 16. July 2025, 21:18 by SamuPiano
I found this a bit harder than 3*, but I chipped away at it throughout today and now solved it! Great construction as always. Thank you for the nice puzzle :)
**
Thank you for your comment, SamuPiano! I am glad that you liked the puzzle. Considering difficulty: I believed the break-in phase to be a little harder and the later stages to be easier than 3 stars. But as a setter, I always find it difficult to estimate. Thanks for sharing your perspective.
Kind regards, sujoyku
on 16. July 2025, 19:11 by Donatello_86
This was a very fun puzzle!!
on 16. July 2025, 19:06 by Donatello_86
This was a very fun puzzle!!
**
Thank you for your comment, Donatello_86! I am glad that you had a fun solve.
Kind regards, sujoyku
on 16. July 2025, 15:14 by Atticus837
What a puzzle! Especially the break in I found very satisfying. You should be proud of this one for sure!
**
Thank you for your comment, Atticus837! I am very fond of this puzzle and it is great to hear you liked it as well.
Kind regards, sujoyku
on 16. July 2025, 12:35 by beansontoast_
Beautiful puzzle, loved every minute!
on 16. July 2025, 11:17 by LehanLehan
Puzzle is as friendly as setter,thank you very much.
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You are much welcome, LehanLehan, thank you for your kind words! It is great to hear that you liked the puzzle.
Kind regards, sujoyku
on 16. July 2025, 08:35 by Ambrose
Very nice smooth puzzle!
**
Thank you, Ambrose! I am glad that you liked the puzzle.
Kind regards, sujoyku
on 16. July 2025, 06:05 by cozmic72
I didn’t need the tens rule until the very end - at which stage I had forgotten the rule and was confronted with a deadly pattern.
**
Thank you for your comment, cozmic72!
Good that the tenline rule is included then. :)
Kind regards, sujoyku
on 16. July 2025, 01:21 by femto113
Lovely--an approachable but non-trivial break in with a very smooth flow.
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Thank you for commenting, femto113! I am glad that you had a smooth solve.
Kind regards, sujoyku
on 15. July 2025, 23:28 by beansontoast_
Beautiful puzzle, loved every minute!
**
Thank you for your comment, beansontoast_! It is great to hear you enjoyed it.
Kind regards, sujoyku
on 15. July 2025, 19:58 by Exigus
Lovely puzzle, thanks! I used the tenline rule a lot (unlike some others it seems) but instead only used about half of the outside clues.
**
Thank you for your comment, Exigus! I am glad that you liked the puzzle.
Kind regards, sujoyku
on 15. July 2025, 11:50 by Franjo
Clever konstruiert! Vielen Dank für das tolle Puzzle.
**
Sehr gern geschehen, Franjo, vielen Dank für deinen Kommentar! Es freut mich, dass es Dir gefallen hat.
Herzliche Grüße, sujoyku
on 15. July 2025, 06:52 by marcmees
very nice. First applied the same rule to white & black dots but that got me nowhere.:-)
Thanks
**
Thank you for your comment, marcmees! I am glad that you liked the puzzle.
Kind regards, sujoyku
on 15. July 2025, 02:27 by rameshsrivats
Very nice puzzle. Completely forgot the Tenline rule. Only needed it at the very end to disambiguate a deadly pattern.
on 14. July 2025, 22:37 by MSDOS
A lovely balance of logic between the constraints used. Very enjoyable, thanks for sharing!
**
Thank you for your comment, MSDOS! It is great to hear you liked the mix of logic in the puzzle.
Kind regards, sujoyku
on 14. July 2025, 18:48 by rameshsrivats
Very nice puzzle. Completely forgot the Tenline rule. Only needed it at the very end to disambiguate a deadly pattern.
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Thank you for your comment, rameshsrivats! I think the tenline makes the puzzle more approachable. In any case, I am glad you liked it.
Kind regards, sujoyku
on 14. July 2025, 18:10 by Snookerfan
Gorgeous puzzle! I really liked how far I could get in the solve without using (which actually means noticing) the ten line constraint. Thank you
**
Thank you for your comment, Snookerfan! I am glad that you liked the puzzle. Also I think I know exactly what you mean. You can do a lot before considering the implications of the Tenline constraint.
Kind regards, sujoyku
Difficulty: | ![]() |
Rating: | 99 % |
Solved: | 98 times |
Observed: | 1 times |
ID: | 000O7S |
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