Chaos Construction: Loop Sum
(Published on 8. April 2022, 18:16 by Phistomefel)
- Fill the grid with numbers from 1 to 9 such that every row, every column and every region contains each of the numbers from 1 to 9 once. The regions are sets of nine connected cells and first have to be determined.
- Draw a loop that travels horizontally or vertically from cell to cell into the grid. This loop enters and leaves every region exactly once.
- A number in the top left corner of a cell indicates the sum of the digits in all visited cells in the respective region.
Here you can find a link to solve the example online.
The puzzle is also available online via Penpa Plus. For solution check please use green lines for the loop and red, green or blue numbers. Have fun solving!
Solution code: 2nd and 3rd column
Comments
on 1. December 2023, 21:07 by Xendari
Fantastic puzzle, I loved every deduction! It didn’t really feel like a 5* puzzle because of how smooth it was
on 27. April 2022, 21:13 by Christounet
Very brilliant and entertaining puzzle which caused my brain to go on loops a few times ! I don't know if the path I found was the intended one (gotta check how Ctc solved it), but it made me feel good anyway ! I'm definitely caught in your loop !
on 12. April 2022, 22:10 by miraflores
Thank you for such a wonderful puzzle! It was really fun to solve.
on 12. April 2022, 17:00 by Crusader175
This was very hard but very beautiful! Another masterpiece, really enjoy solving this. :)
on 12. April 2022, 16:59 by miraflores
Thank you for such a wonderful puzzle! It was really fun to solve.
on 12. April 2022, 14:00 by Phistomefel
I am a overwhelmed by your feedback. Thank you so much, everyone!
@Manycoloredcoat: Congratulations! :)
on 12. April 2022, 12:07 by Prutsbeest
This is such nice and challenging logic! Thank you Phistomefel!
on 12. April 2022, 08:43 by Manycoloredcoat
My first phistomefel puzzle I completed without help! (If you don't count example puzzles)
Thank you a lot for the fantastic work you're doing!
on 12. April 2022, 02:16 by SimplePurpleFrog
Wow! What a puzzle! Very hard, but just as amazingly good. Definitely extra good brain exercise.
Double Simon's time, but very chuffed I was able to complete it without hints. Only a few months ago that would have been unthinkable!
on 12. April 2022, 01:09 by Manycoloredcoat
My first phistomefel puzzle I completed without help! (If you don't count example puzzles)
Thank you a lot for the fantastic work you're doing!
on 10. April 2022, 17:24 by Mody
Gigantisch, wie sich alles ergeben hat, nachdem ein bestimmtes Gebiet gefunden wurde.
Gigantic, how everything turned out after a certain region was found.
on 10. April 2022, 15:48 by SudokuExplorer
Great concept and very entertaining solve, thanks! :-)
on 10. April 2022, 15:10 by zuzanina
Sehr schönes Rätsel! Vielen Dank! :-)
on 9. April 2022, 22:51 by Annunakki
Always enjoyable to solve your puzzles. Never stops to amaze me. Thanks a lot!
on 9. April 2022, 17:39 by Phistomefel
Wow, thank you very much for all the warm feedback, folks! :)
on 9. April 2022, 17:21 by fpac
In the example, 14 is not in the top left of the purple region. Is this intentional?
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Reply: Yes, this is intentional. The cells containing the clues can be at any position within the region.
on 9. April 2022, 14:39 by MagnusJosefsson
Lovely! Fun and original!
on 9. April 2022, 14:02 by Playmaker6174
I have to admit, I made myself harder to scan this grid after getting through lots of steps, fairly challenging but extremely enjoyable puzzle (considering I'm not really good at loop puzzles) :}
on 9. April 2022, 13:50 by Qodec
Ah, That was fantastic! No better way to spend a few hours than to dive into this beauty!
on 9. April 2022, 07:47 by Nordy
Amazing puzzle! I had a blast solving it. I gasped when the 3 revealed its role in the puzzle
on 9. April 2022, 06:15 by Dandelo
Sehr schön.
@Niverio: If you click on 'Share' and then 'Generate URL with Answer Check' you see the settings for the answer check.
on 9. April 2022, 05:06 by RockyRoer
Surprisingly approachable— the example puzzle was quite instructive too, always appreciate that Phistomefel!
on 9. April 2022, 04:11 by DiMono
This is such a clean solve for a puzzle that looks like it should be much more difficult than it is. Fantastic puzzle as always. Thank you for this.
on 9. April 2022, 01:13 by Phistomefel
Regelklärung
on 9. April 2022, 01:08 by Phistomefel
Thank you for the very kind feedback, everyone! I am very happy that you enjoyed the puzzle!
@Niverio: Thank you for informing me about the issue! It is a bit unfortunate that I chose a red line for the example, but the green one was very badly visible. I will include the line issue in the desciption.
@Piatato: Thank you for the question - the loop can only move orthogonally. I will include it in the rules.
on 8. April 2022, 23:43 by Piatato
I was quite nervous about this one, since I'm in general horrible at solving different kinds of loop puzzles, haha! In the end I had a really enjoyable time solving this puzzle, it all came together in a very elegant fashion. Thank you a lot for setting this!
on 8. April 2022, 22:51 by Jesper
Really fun, thanks!
on 8. April 2022, 22:35 by Piatato
This loop cannot move diagonally, I assume?
on 8. April 2022, 21:44 by marcmees
an approachable Phistomefel puzzle. Thanks.
on 8. April 2022, 21:22 by Niverio
Very fun puzzle, thanks Phistomefel!
Note: When I did solve it in Penpa+ link, the answer check didn't trigger even though solution code was correct. I checked and my edges were there, I did color the different regions too. Maybe that had an effect?
Edit: Vebby contacted me and said that it would likely be because I used red lines for the loop, while it needed to be green, so issue resolved.
on 8. April 2022, 20:14 by Steven R
Fun puzzle, thanks Phistomefel!
