Rainbow Palindromes (Palindromes/Ambiguous Lines)
(Published on 26. June 2025, 21:12 by damo_89)
The standard palindrome line is so boring and grey. Palindromes should get a chance to dress up in the wonderful myriad of colours that the other line constraints get. Consensus testing estimate was a solid 3 stars, despite me making a total hash of my test solves and thinking it was harder. Good luck!
- Normal sudoku rules apply: Place the digits 1 to 9 once each in every row, column, and 3x3 box
- All lines in the grid are palindromes, which must read the same forward as backwards
- In addition, each of the following constraints applies to exactly one line in the grid:
- German Whispers: Adjacent digits must differ by at least 5
- Parity: Adjacent cells must contain one odd and one even digit
- Region Sum Line: Box borders divide the line into segments with the same sum
- Ten Line: Must contain one or more non-overlapping contiguous groups of cells that sum to 10
- Zipper: Digits an equal distance from the center of a zipper line must sum to the digit in the center
NB: The lines have been left hollow. In sudokupad the pen tool can be used to colour in the line when its type has been established.
Solution code: Row 8
Comments
on 29. June 2025, 14:19 by AnebodaSlatorp
Really fun thank you
on 29. June 2025, 11:29 by Chaka
Very nice!
on 28. June 2025, 13:43 by Exigus
That was great fun. Thanks!
on 27. June 2025, 22:16 by Fennaatje.Engeltje
Had a great time trying to deduce what types the lines could be, very fun detective work :)
Also love the touch of the hollow lines.
on 27. June 2025, 17:44 by Snookerfan
Beautiful and fun! Thank you
on 27. June 2025, 14:17 by ChinStrap
This was a fun one!
