Matryoshka
(Published on 25. July 2025, 21:05 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]
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Solution code: Column 6
Comments
on 21. August 2025, 13:02 by QuiltyAsCharged
Excellent puzzle, very cleverly designed!
I do think the vertical 9 clue is needed. Or at least, it's very helpful in resolving a couple sandwich options, so it's good to have it
on 28. July 2025, 19:17 by timotab
Updated with colourable clue cells
on 28. July 2025, 01:44 by vitaminz
I found this quite hard (4*) but very worthwhile. The ending in particular was a joy to uncover. For the future, I would find it helpful if I could highlight the clues so I could black out clues I’ve completed to help with scanning. This might just be because I tend to do puzzles in fits and starts but I doubt I’m alone in that :)
on 26. July 2025, 15:25 by Franjo
These doll sums give a nice twist on sandwich sudoku. (I think Elliot810 is right.) Thank you very much for creating and sharing this lovely puzzle.
on 26. July 2025, 13:46 by MattYDdraig
Very nice. Interestingly, I did use the vertical 9 clue, albeit in a slightly limited way.
on 26. July 2025, 00:44 by Fool on Hill
Clear and clean logic using an underused ruleset. Lovely puzzle.
on 25. July 2025, 21:12 by jakestilesowen
It's very neat how so few clues of only one type can feel so perfectly balanced and interesting. Thanks for the puzzle!
on 25. July 2025, 21:11 by Fra314
Brilliant construction, one of those puzzles that you never forget!
