Hammerhead
(Published on 7. January 2026, 17:29 by cygne)
Hammerhead by Cygne
Rules
- Normal Sudoku rules apply.
- Palindrome Line: Digits along the grey line read the same forward and backward. The center of the line is indicated for readability.
- German Whispers Line: Digits along the green line differ by at least 5.
- XV Sums: Digits separated by a V sum to 5. Digits separated by an X sum to 10.
Play in SudokuPad
I enjoyed making Spooky Action at a Distance, and wanted to make a similar puzzle that is a little bit less difficult. Hope you enjoy, and give that one a challenge too if you did!
Solution code: Column 9, top to bottom
Comments
on 31. March 2026, 02:36 by cantare
Took me 3.5 hours, and I'm sure I missed some easy deduction because it turned into a bash fest where I was tracking about 4 levels of variables (2 sets of letters, high/low, and palindrome colors). But very enjoyable throughout!
on 11. January 2026, 23:42 by Inge
That was hard bur fun , over one hour. Thank you
on 9. January 2026, 22:17 by Shuhua Milk
Nice!
on 8. January 2026, 22:22 by steinchen
Very fun colouring puzzle with a bit of math to find the right combination. Thanks!
on 8. January 2026, 12:21 by Exigus
Slightly easier but still hard. Lovely puzzle as was the spooky action. Thanks!
on 8. January 2026, 12:16 by snuuba
Yes, it was maybe slightly easier than "Spooky Action at a Distance", but not much. At least 4 stars for me. Required few restarts and few hours. Many thanks for great puzzle.
