Matryoshka Snova
(Published on 25. August 2025, 02:52 by timotab)
- Normal Sudoku rules apply: Place the digits 1-9 in every row, column, and box, without repetition.
- Russian Doll Sums: Clues outside the grid indicate that in that row or column, there exist two digits which sum to the clue, such that the digits between them also sum to the clue. If there are multiple clues in a row or column, the sequences of clued digits appear in the same order as the clues, and those sequences do not overlap.
- [Alternate framing of Russian Doll Sums: Each outside clue represents a sandwich where the two crust digits sum to the clue and so do the filling digits. Sandwiches in the same row or column appear in the same order as the clues and do not overlap]
As well as setting puzzles, I also solve puzzles on YouTube. Please check it out!
Solution code: Column 2
Comments
on 21. November 2025, 06:07 by Richard
I enjoyed this one even more than the other one, with a very tight solve path and the four bottom rows completely clueless. Well done!
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Thank you so much for the kind words. Please also check out Overlapping Matryoshka which has similar rules.
-- Timotab
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Thanks for the hint. I will take a look at it. Did you notice my take on the ruleset yet? SVS #451. :)
on 15. October 2025, 11:49 by QuiltyAsCharged
Very nice and fun puzzle. I found it on the easy side of 3 stars, and yet very easy to make a silly mistake or two!
on 11. September 2025, 08:29 by yttrio
Very nice interactions between some of the number clues!
on 8. September 2025, 19:30 by damasosos92
Very nice and well telegraphed logic too!
on 3. September 2025, 21:13 by MattYDdraig
Lovely puzzle. I really liked how row 1 practically leads you into making the right deductions for various places.
on 3. September 2025, 17:41 by Fool on Hill
Cool puzzle. I hope that there will be a few more with this rule, which has some interesting and different features. Thanks for setting.
on 25. August 2025, 15:46 by Franjo
Tricky and lovely. Thank you very much for creating and sharing.
This interesting sandwich-twist was new to me. Is it your invention?
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It is not. It was part of a prompt for a speed setting competition a little over a year ago, and I decided to revisit the constraint recently.
on 25. August 2025, 14:00 by marcmees
Fun & easy. Thanks
on 25. August 2025, 06:30 by timotab
fixed solution code
on 25. August 2025, 06:09 by atmospherium
According to Sudokupad I completed the puzzle, but the solution code didn't work for me. I tried all columns and rows in case any worked and didn't find a successful entry.
Beyond that, this is my first puzzle with Russian Doll Sums and it was a very enjoyable solve.
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apologies, I had a typo in the code. Now fixed. --Timotab
