All Little Killers are Odd
(Published on 21. January 2026, 18:44 by RailMan)
Normal Sudoku Rules apply. Place the digits 1 - 9 once in every row, column and box.
Parity lines: Digits on red lines must alternate between even and odd.
Maximums: Grey cells with arrows pointing outwards are greater than all orthogonally adjacent cells.
Minimums: Grey cells with arrows pointing inwards are smaller than all orthogonally adjacent cells.
Odd Little Killers: Numbers outside the grid show the sum of digits in the direction of the arrow. In this puzzle no Little Killer clues are shown, but every possible Little Killer clue would have an odd total. This applies to every possible little killer clue in both directions (top left to bottom right and bottom left to top right).
Solve Online : Solution Check is enabled
Rules Clarification: The rules mean that every little killer arrow shown in the picture below must have an odd total.
Solution code: Row 9
Comments
on 24. January 2026, 16:10 by macintux
Thank you for the clarification: I kept trying and failing to make it work like the 6x6 example.
Terrific puzzle.
on 22. January 2026, 19:50 by Franjo
Thank you very much for creating and sharing this funny odd-even puzzle.
on 22. January 2026, 14:37 by RailMan
Added a rule clarification
on 22. January 2026, 11:01 by farodin64
All possible little killer sum to an odd value. Very nice puzzle, thanks a lot.
on 22. January 2026, 01:11 by ScatterBrain
Yes, I misread the diagonal lines as well. But then I understood. Thanks for making this!
on 22. January 2026, 00:15 by Exigus
Interesting ruleset and nice execution. Thanks!
on 21. January 2026, 23:18 by dzamie
Misread the rules at first. I initially read it as "all possible odd little killers have been given" - that is, every diagonal has an even sum, since no odd little killers have been given.
RailMan: The rules text is not the best. Can you suggest a better way I could write it?
