Dutch-pelgänger
(Published on 6. December 2025, 16:19 by ChinStrap)
Thanks to all that tested!
DOPPELGÄNGER SUDOKU:
- Fill each cell of the main 9x9 grid such that every row, column and 3x3 box contains a 0 and eight different digits from 1-9.
- No two rows, no two columns and no two boxes may be missing the same digit.
- For each 0 in the grid, the digits missing in its row, column and region must be three different digits.
- The notes area outside the grid must filled in with the digits that are missing from the corresponding row/column/box.
DUTCH WHISPER LINES:
- Adjacent digits on an orange line must differ by at least 4.
All feedback (positive or critical) appreciated!
Solution code: The row missing a 9, left to right (9 digits total)
Comments
on 6. January 2026, 19:25 by GeorgeTheToad2
Wow that was a blast, love this ruleset and the help that the outside grid gives to the solve path.
on 26. December 2025, 16:13 by PuzzlePatzer
Very nice - helped me realise something about Doppelganger Sudoku that was probably obvious to everyone else.
on 18. December 2025, 21:59 by MSDOS
Very nice use of the added digit 0 in the main grid. Elegant, yet challenging setting! Very enjoyable!
on 16. December 2025, 17:12 by woody
Very nice to workout the secret rules behind those shapes before finding the breaking, and seeing how all that unfolds. Great puzzle !
on 9. December 2025, 15:37 by gfoot
Really nice construction, the dutch whispers are a great complement to the Doppleganger rules
on 9. December 2025, 00:19 by marty_sears
That was very nice indeed. I enjoyed working out some ground rules that let me break in. Needed a few little hints along the way but this didn't diminish my enjoyment. A tricky but very smooth, fair and beautiful puzzle
on 8. December 2025, 06:17 by War
Break in was very nice, and had a great flow. This is one of the most approachable doppelganger sudokus, and would highly recommend this to all despite the high difficulty rating
on 7. December 2025, 13:43 by ChinStrap
Fix rules
on 7. December 2025, 13:41 by GraphZahl81
In the first subpoint of doppelgänger sudoku rules, you write "five different digits from 1-9", where it clearly should be eight.
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Thanks, fixed.
on 7. December 2025, 10:16 by ralphwaldo1
Clever break-in and enjoyable and smooth solve!
on 7. December 2025, 00:50 by sujoyku
What a nicely brain-melting puzzle! I might need a new brain now, but it was fun. :) Thank you, ChinStrap!
on 6. December 2025, 23:43 by Tinnifer
I struggled with this puzzle for quite a while because the logic was just so alien to me, until suddenly it clicked in my head and it solved really smoothly. Superb puzzle, I really enjoyed it!
on 6. December 2025, 23:04 by ChinStrap
fix rules
on 6. December 2025, 22:38 by SKORP17
main 6*6 grid ???
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ChinStrap: Thanks, fixed.
