Sudoku Variants Series (323) - Killer Kropki Sudoku
(Published on 2. June 2021, 00:00 by Richard)
Killer Kropki Sudoku
Inspiration for this type comes from Willy Wonka.
Solve online in F-Puzzles (thx PixelPlucker!)
or Sudokupad (thx sisk0!)
Apply classic sudoku rules.
A white dot between two dotted outlined
regions indicates that the sums within those regions have a difference of one. A black dot between two such
regions indicates that one of the sums is twice the other sum. When there is no dot between two regions, they
cannot have sums that differ by one or are double. Digits may not repeat in regions.
Solution code: Row 1, followed by row 9.
Comments
on 4. December 2025, 01:14 by dzamie
This is a really engaging puzzle, but unfortunately I ran into a wall 2 hours in and have neither an idea of when I went wrong, nor the patience to start again from zero.
Still, I'm very glad I gave this a shot! There's a lot of incredible logic behind it, and I like that placing digits before finding out all the sums is not only possible but necessary (I hope)!
on 3. December 2025, 19:03 by Franjo
I solved this beauty after solving the „easy-peasy“ calendar-puzzle (Dec 3rd, 2025). Thank you very much, again, for creating this gem and leading me to find it.
on 2. December 2025, 20:40 by Richard
Updated links to online solve tools.
on 1. June 2025, 14:04 by Bankey
Fun puzzle. Thanks, @ Richard :). (And, thanks @ sisk0 for providing the sudokupad link :).
on 14. March 2025, 17:14 by sisk0
Sudokupad link:
https://sudokupad.app/rusn6v8ob3
on 25. February 2025, 21:27 by Piatato
Awesome!
on 10. June 2021, 11:09 by Mody
hat großen Spaß gemacht
on 3. June 2021, 22:40 by Rollo
Ein Monster :-). Ich werd das von Willy Wonka wohl auch probieren.
on 3. June 2021, 04:35 by Willy Wonka
Brilliant Richard! So pleased to see such a masterful construction using this ruleset (and even more pleased to have been able to solve it!). Challenging and exciting throughout
on 2. June 2021, 17:29 by henrypijames
The entry was long and intricate (lack of a loopback would do that, of course), and the puzzle remained hard till the end.
on 2. June 2021, 15:37 by marcmees
very nice. thanks
on 2. June 2021, 14:23 by Statistica
Wieder mal sehr raffiniert!
on 2. June 2021, 11:24 by henrypijames
Penpa+: https://git.io/JG2BW
on 2. June 2021, 07:48 by Richard
Added link for online solving. Thx PixelPlucker!
on 2. June 2021, 05:02 by PixelPlucker
Beautiful puzzle! I've been a fan of this ruleset ever since Willy Wonka's original. This one had a really fun solution path. Thank you :)
Here's an f-puzzles link I made using cosmetic circles for kropki: https://f-puzzles.com/?id=y4sgdrpb
