Whirlpool
(Published on 8. October 2021, 21:23 by Jay Dyer)
Whirlpool
Rules:
1. Standard: Normal sudoku rules apply.
2. Standard killer: Digits in a cage must sum to the clue in the top left corner.
3. Palindrome variant: Digits on the line are a palindrome whose two ends have to be discovered. No digit may appear more than twice in the palindrome (i.e. each digit is reflected to the other side of the palindrome, but cannot reoccur other than that).
Solution code: Rows 4 and 5 (18 digits, no spaces or commas)
Comments
on 18. September 2022, 10:37 by cdwg2000
Very nice！
on 9. October 2021, 09:50 by Jay Dyer
Changed the f-puzzles version so that the palindrome is not checked when solving; prevents determining its start point by trial and error.
on 8. October 2021, 23:39 by zegres
Tough, but very clever and satisfying puzzle
