Sum Line Sudoku #2
(Published on 8. October 2022, 12:57 by Phistomefel)
- Fill the grid with the numbers from 1 to 9 so that in each row, column, and 3x3 block, each digit occurs exactly once.
- For every triple of adjacent digits on a line, one of the digits has to be the sum of the other two, e.g. 2-5-7, 6-9-3, and 8-4-4 are valid adjacent digits along a line. Digits may repeat on a line if allowed by the other rules.
Here you can find a link to solve the example online.
The puzzle is also available online via F-Puzzles and CTC-App. Have fun solving!
Solution code: The last two columns
Comments
on 31. May 2023, 16:49 by OldCaptainWZJ
Even with the logic I established in the previous puzzle, and even after seeing what this puzzle is about, it still has a lot of fresh logic to offer. Doing the previous puzzle did help with grasping this kind of restriction, so the difficulty isn't overwhelming for me.
on 8. February 2023, 23:24 by SudokuExplorer
Intriguing constraint! Both puzzles had a plethora of different ideas, which were a pleasure to uncover. Thanks! :-)
on 8. December 2022, 21:37 by Deathranger999
I don't normally try Phistomefel puzzles, or generally CTC video puzzles that are longer than an hour, but I decided to give this one a shot. To my surprise I actually found the break-in in not too long. After that the logic flowed really really nicely. Awesome puzzle, super happy to have solved it!
on 23. November 2022, 08:36 by PotatoHead21
Wow. This puzzle was super hard, Required lots of scanning and numerical analysis. I'm glad I was able to solve it.
on 5. November 2022, 16:18 by meixia
Even better than the first one. A lot more challenging too, but I don't mind a good challenge from time to time. Thank you for the puzzles!
on 30. October 2022, 10:40 by gurgilewis
Beautiful and so fun to solve. Such a clever idea and executed so well. The variety and synergy of the lines is incredible. Difficult, but once you figure out a strategy it's challenging but manageable.
on 11. October 2022, 18:02 by DiMono
Well that is certainly not what I expected the break-in to be! :D A more than worthy sequel to the first.
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Thanks a lot, DiMono! I am honored. Unfortunately, I had (and still have) no idea how to telegraph the break-in properly.
on 11. October 2022, 13:17 by Fool on Hill
Truly great puzzle - I was solving while distracted and it took me a while to work through the logic. Once I saw what was going it was a pretty tough puzzle, but solved really nicely with fresh things to think about at each stage,.
on 11. October 2022, 08:15 by cmb
Incredibly good but just as hard.
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Thank you so much, cmb!
on 11. October 2022, 01:11 by antiknight
That was a brutal and crazy break-in and it didn't stop after that. I did so many gorgeous deductions to solve the puzzle! I loved the logic around the lines in boxes 4 and 7 a lot! Thanks for sharing this amazing puzzle Phistomefel !
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Reading this, I am very glad that I redesigned the break-in to make it more accessible. And it's great to hear that the puzzle was to your liking. Thanks! :)
on 10. October 2022, 17:19 by drbs
The break-in was too difficult, but then the loop made me insane. Very nice!
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Glad you enjoyed the puzzle anyway. ^^;
on 10. October 2022, 17:03 by DVFrank
Ein wirklich großartiges Rätsel! :^)
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Vielen Dank, DVFrank! :^)
on 10. October 2022, 15:04 by GrizzledStoat
What a lovely lovely puzzle.
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Thank you so much! :)
on 10. October 2022, 13:46 by peacherwu2
Has to be this hard???
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No, it didn't have to be this hard. I just had a few pieces of logic I wanted to incorporate into the puzzle and it turned out this way.
on 10. October 2022, 12:47 by Fool on Hill
Brilliant, but very hard. The logic around the 3-cell lines in row 6 and column 4 was challenging and beautiful when I got to it. Somehow I made it through - very glad I put in the effort.
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Thank you, Fool on the Hill (by the way a very lovely book). The step you described came very naturally to life and I was glad with how it turned out.
on 9. October 2022, 20:08 by Playmaker6174
Stunning, intricate, challenging and engaging till the very end! The logic involved around box 1 and 2 was magical to witness, but the puzzle didn't really let it loose till the very end of the solve. Plenty of fresh and wonderful deductions throughout! ;)
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Thank you, Playmaker! I was quite astounded for the logic these lines allow for and I am glad you enjoyed it.
on 9. October 2022, 13:22 by Phistomefel
Thank you so much for wonderful feedback, everyone!
@TotallyNormalCat: I'm glad you liked this piece of logic, since I was particularly happy when I found it and got it working. :)
on 9. October 2022, 12:46 by Snookerfan
Great puzzle, very interesting all the way through! Thank you so much.
on 9. October 2022, 00:43 by Qodec
Fully delivering on the promise of the first puzzle. Beautiful fresh deductions in here!
on 8. October 2022, 21:36 by TotallyNormalCat
Amazing puzzle, I especially liked the logic around boxes 1,2 + the loop clue :)
on 8. October 2022, 21:09 by Phistomefel
Thank you so much for the kind words, Jesper and Piatato! I am glad you enjoyed the logical variety of the puzzle.
on 8. October 2022, 15:56 by Piatato
This constraint keeps fascinating me a lot! Thanks for the tough, but very interesting and nice puzzle :-)
on 8. October 2022, 14:52 by Jesper
Very nice! A lot of cool deductions, quite varied logic. Much more challenging than the first puzzle, in my view.
