Penpalindromes
(Eingestellt am 23. Oktober 2025, 02:04 Uhr von cygne)
Penpalindromes by Cygne
Rules
- Normal Sudoku rules apply.
- Digits along gray palindrome lines read the same forward and backward.
- Digits separated by a white Kropki dot are consecutive.
- Digits separated by a black Kropki dot are in a 2:1 ratio.
Play in SudokuPad
After my extremely long modular line puzzle, Modulo Oblongata, I wanted to try to make an extremely long palindrome line. Hope you enjoy!
Lösungscode: Column 9, top to bottom
Kommentare
am 31. Januar 2026, 20:01 Uhr von canyonkraft
very fun coloring exercise
am 25. Januar 2026, 04:23 Uhr von VitP
fairly hard to do the colouring, but then the digits follow in seconds.
one does not simply walk along the palindrome.
but there IS a "standard" procedure that makes the solution routine.
0) you will need OVER TWENTY separate symbols. thus there is no "choice" in the matter. you have to use letters.
1) having marked up the ENTIRE long palindrome, diligently search for cells that allow you to make real progress. ONLY for cells that allow you to find MORE EQUAL cells (i.e. not just 2, and no candidates), put in a colour.
2) keep iterating, ensuring that each new colour added is DIFFERENT from any previous colour.
am 9. Januar 2026, 07:36 Uhr von samsamsam1000
new to non-normal sudoku, fun and way easier on my brain that there are no anti-knight shenanigans. Colored everything and needed a friend to help get the first number
am 23. Oktober 2025, 23:17 Uhr von Fra314
Letters, then colours, then candidates, then constraints :D
Super fun!
am 23. Oktober 2025, 23:02 Uhr von greemi01
that was fun. i prefer letters when so much coloring is needed
am 23. Oktober 2025, 20:23 Uhr von dzamie
Very easy if you know how to handle "long palindrome" puzzles. I use colors because filling the box is easier to read than staring at little letters.
am 23. Oktober 2025, 20:03 Uhr von damo_89
Team ABC here! No to colours!
am 23. Oktober 2025, 19:21 Uhr von UndeadDodo
Going from no digits placed to finished in 30 seconds was very satisfying. Ty for the puzzle. :D
am 23. Oktober 2025, 17:45 Uhr von rmulinix
Solved via letters.. nice puzzle.
am 23. Oktober 2025, 16:16 Uhr von War
I just read in the comments that someone uses letters instead of coloring for candidate marking. My mind is blown, letters are for disambiguating colors or for candidates in chaos construction when you need colors for regions. This is the only way
am 23. Oktober 2025, 15:20 Uhr von Franjo
Funny „Madam, I’m Adam“-construction. Thank you very much for creating and sharing.
am 23. Oktober 2025, 09:36 Uhr von BorisTheSnake
Beautiful coloring exercise!
am 23. Oktober 2025, 03:57 Uhr von sfield
That was a fun puzzle. I like puzzles that I can solve completely with letters before I even begin to fill in the numbers.
