Gravestone in the Fog
(Published on 17. October 2025, 02:00 by fogpictures)
Solve with Sudokupad
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here to see the picture without numbers.
Note: The parity lines (which alternate between odd and even) are red. There is only one palindrome line.
• Normal Sudoku rules apply.
• Digits along a red parity line must alternate between odd and even.
• Digits along the grey palindrome line read the same forwards or backwards.
• Adjacent digits along a green German whisper line must have a difference of at least 5.
• Digits along a dark orange Dutch line must have a difference of at least 4.
• Cells with a filled square must be even.
• A black dot between cells indicates cell values with a 2:1 ratio.
• A white dot between cells indicates cells with consecutive values.
• Not all dots are shown.
• A V between two cells means they add up to 5.
• An X between two cells means they add up to 10.
• The board is covered in fog. Place a digit correctly and the fog will lift around it.
Solution code: Enter digits in 3rd row.
Comments
on 22. October 2025, 13:45 by Sebking
It's a nice little puzzle. Not that hard, but still fun!
on 17. October 2025, 17:08 by Myfyr MJ
Very easy if you assume one palindrome line. Impossible otherwise.
on 17. October 2025, 16:24 by fogpictures
Added note that there is only one palindrome line.
on 17. October 2025, 15:52 by googuee
Initially, I didn't pay attention to the comments, so the only way I was able to proceed is to assume one palindrome line. After I solved the puzzle, I tried to find a way to proof logically that there can be only one palindrome line but I was not successful. So I assume it should be part of the rules unless I am missing something.
on 17. October 2025, 12:04 by abadx
The "only one palindrome exist" should be included in the rules. Other than this a cool puzzle
on 17. October 2025, 11:28 by fuxia
Your rules are incomplete, the puzzle cannot be solved without reading the comments. Please update the puzzle rules. Apart from that, it's a nice puzzle.
on 17. October 2025, 10:01 by zrbakhtiar
Should have include that statement in edited post rather than in comment
on 17. October 2025, 08:45 by Nylimb
I don't usually read the comments before starting a puzzle, so I got hopelessly stuck at one point. Eventually I looked again at the puzzle page and found the comment about the palindrome line. Is there a reason that that's not in the description?
Except for that, I enjoyed the puzzle.
on 17. October 2025, 04:13 by fogpictures
There is only one palindrome line.
