Hidden keys (Diagonal constraint killer sudoku)
(Published on 7. July 2023, 12:02 by sujoyku)
- Normal sudoku rules apply.
- Killer cages: Digits in a cage do not repeat and sum to the clue in the top left.
- Diagonals: On the main diagonals digits do not repeat.
Here you can solve the puzzle online:
Solution code: Row 6 followed by Column 5, from left to right resp. from top to bottom (18 digits in total)
Comments
on 8. May 2026, 22:54 by Lor
Challenging enough to keep me pleasantly engaged to the end, but never so hard as to require me to stop listening to my book and focus exclusively on the puzzle. Just right! Thank you.
Link with solution checking:
https://sudokupad.app/oc4ouvdib4
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Thank you for your comment, Lor! I am glad that you enjoyed the puzzle.
Kind regards, sujoyku
on 12. February 2026, 20:09 by PinkNickels
So good.
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Thank you, PinkNickels!
Kind regards, sujoyku
on 14. June 2025, 14:04 by Fenners
This is very nice! Thanks sujoyku :)
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You are much welcome, Fenners, thank you for your comment! I am glad that you enjoyed the puzzle.
Kind regards, sujoyku
on 29. January 2025, 20:19 by Lorena
I get the message: everything is connected. Thank you, sensei.
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You learned well, Lorena, and your sensei is proud of you. :)
Without kidding, thank you so much for the nice comment!
Kind regards, sujoyku
on 11. December 2024, 23:13 by MattYDdraig
Some very nice (and tricky) steps in this. Lots of fun and very satisfying.
Edit: Ah, that explains why it felt familiar. I think I'd solved it a while back from the link on the CtC video.
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Thank you for your comment, MattYDdraig! This has been my first ever CTC feature. Not only for that, the puzzle is a very special one for me. So I am glad you enjoyed it as well.
Kind regards, sujoyku
on 7. July 2023, 20:18 by prodigis
Extremely clever!
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Thank you for the kind word, prodigis! I am glad that you liked the puzzle.
Kind regards, sujoyku
on 7. July 2023, 12:59 by Piatato
It was indeed joyful, thanks! :)
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You are much welcome, Piatato, thank you for your comment! I am glad you enjoyed the puzzle.
Kind regards, sujoyku
