Double Negative
(Published on 17. January 2024, 21:12 by JeremyDover)
For those who enjoy math!
Rules
Normal Sudoku rules apply.
Double Negative rules: The grid contains 9 double negative cells, one in each row, column and box. For purposes of killer sum clues, the digits in double negative cells count as -2 times their value. Each digit from 1 through 9 is double negated exactly once.
Killer Cages: Digits in cages cannot repeat and must sum to the number shown in the upper left corner of the cage, if given.
Little Killers: Digits along an indicated diagonal must sum to the given number outside the grid.
Many thanks to chameleon and Qril for testing!
Solution code: Row 6 (9 digits, left to right, no spaces/commas).
Comments
on 17. October 2024, 19:04 by JeremyDover
Added Modifier Cells tag
on 4. October 2024, 21:47 by Nemefish
Want to add, that I really like the one special cell per box constraint (doublers, negators, etc) and wish LMD had a way to search for them.
on 4. October 2024, 21:46 by Nemefish
For me, the puzzle has a nice entry where I made progress early, then slowed down to a tough chewy puzzle in the middle. A bit of a stretch for me, but satisfying when I did manage to finish
on 11. February 2024, 19:38 by Snookerfan
Great puzzle with interesting logic! Thank you
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JeremyDover: Thank you for your kind words!
on 21. January 2024, 22:58 by henrypijames
"Zero Sum Game" would've been a more intriguing title. ;)
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JeremyDover: I had already picked out my bad pun for the title before starting the puzzle, alas :-) Thanks for the comment!
on 18. January 2024, 06:35 by Allagem
Oh I disagree, this was definitely quite mathy. I got a nice mental workout keeping track of all the math in my head :) Nice puzzle!
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JeremyDover: Thanks so much. Very glad you enjoyed!
on 17. January 2024, 22:18 by chameleon
Not really mathy, but surely enjoyable!
