Hydra
(Eingestellt am 12. Mai 2021, 18:33 Uhr von zetamath)
Normal irregular sudoku rules apply, but the regions must be determined by the solver. That is to say, every row and column must contain the digits 1-9 exactly once, and there are nine orthogonally connected regions in the grid that also contain the digits 1-9.
Each region takes the form of a friendly serpent, which is one cell wide, 9 cells long, and does not touch itself, even diagonally. Each serpent has a head and tail, also to be determined by the solver.
We think of the head of the snake as the first cell, the next cell as the second, and so on. A cell in the grid is circled if the digit it contains matches its position in this way. That is, the head is circled if it is a 1, and the tail is circled if it is a 9, and so on.
ALL circles have been given.
Have fun, leave a comment if you enjoy the puzzle!
Lösungscode: Row 8
Kommentare
am 14. Februar 2023, 17:03 Uhr von codewizard
For those who prefer CTC/SudokuPad: https://app.crackingthecryptic.com/sudoku/btgQm83JD2
am 13. Januar 2023, 20:46 Uhr von StephenR
Most enjoyable, thanks. Would be happy to see more like this.
am 14. April 2022, 20:03 Uhr von Christounet
Digging up some of your "old" puzzles. This one was quite approchable and still very fun! And it does look like an Hydra when completed, which is a nice reward for the solver !
am 3. Juni 2021, 12:14 Uhr von Vebby
Very enjoyable! :)
am 24. Mai 2021, 21:56 Uhr von Klausku
I really enjoyed this one. Challenging but not too difficult. Really nice how the deadly pattern cleared itself at the end. Thank you very much.
am 23. Mai 2021, 17:09 Uhr von Klausku
I really enjoyed this one. Challenging but not too difficult. Really nice how the deadly pattern cleared itself at the end. Thank you very much.
am 23. Mai 2021, 15:08 Uhr von Mody
Großartig
am 23. Mai 2021, 08:29 Uhr von Klausku
I really enjoyed this one. Challenging but not too difficult. Really nice how the deadly pattern cleared itself at the end. Thank you very much.
am 14. Mai 2021, 00:35 Uhr von MagnusJosefsson
Very nice and enjoyable solve!
am 13. Mai 2021, 23:30 Uhr von SenatorGronk
Thanks, this one was fun!
am 13. Mai 2021, 21:25 Uhr von Klausku
I really enjoyed this one. Challenging but not too difficult. Really nice how the deadly pattern cleared itself at the end. Thank you very much.
am 13. Mai 2021, 17:07 Uhr von henrypijames
Incredibly intricate, just wow!
Don't remember using the "no diagonal touching" rule - is it really necessary?
Suggestion for Penpa+: Use the dotted circles, which are transparent and allow for coloring of the cells.
[It is not necessary, and indeed I think you could prove it can't happen because it would lock off too few cells to fit another snake. However, I figured it was better to include what I consider "standard snake rules" to make it easier to parse, but I'm never quite sure with things like this!]
You're right of course. In fact, the no-touch rule can be dropped entirely, stating instead that being one-cell wide means a snake cannot occupy any 2×2 block of cells.
