Gee, Officer Kropki
(Published on 18. November 2025, 13:08 by EdTheAlchemist)
Chaos Construction: Divide the grid into nine orthogonally-connected regions, so that each row, column and region contains all the digits 1 through 9 without repetition.
Extra Chaos: No 2x2 square anywhere in the grid may be entirely part of the same region.
Kropki Dots:
- Black Kropki dots separate digits in a 1:2 ratio.
- White Kropki dots separate consecutive digits.
- Both digits on a black or a white dot MUST count the number of cells they see orthogonally in the same region as themselves, including themselves.
Kropki Whats:
- Grey Kropki dots separate digits in a 1:2 ratio and/or consecutive digits - but you must determine which for each dot.
- Any digit on a grey dot MAY, but need not, count the number of cells they see orthogonally in the same way as black or white dots.
Kropki Nots:
- Cells not on Kropki dots NEVER count the number of cells they see orthogonally in the same way as black or white dots.
Solution code: Fourth row
Comments
on 20. November 2025, 23:14 by VicJameson
Very enjoyable puzzle. I've been getting into more chaos construction puzzles lately, and this is why. Thanks.
on 19. November 2025, 15:54 by Fredneu
Beautiful puzzle. Normally I shy away from chaos construction, but I'm glad I did it
on 19. November 2025, 10:58 by Snookerfan
Very nice! The negative constraint is powerful, but hard to scan. Thank you
on 19. November 2025, 09:20 by wuc
Awesome setting. The region building lifts it to 4* in my opinion. Great fun thx.
on 18. November 2025, 22:05 by nassausolver
Ok I haven't even started yet but as a theatre person who is also a Sudoku addict, I LOVE this pun.
on 18. November 2025, 19:45 by EdTheAlchemist
Updated to include wording corrections suggested by monaters and markmees (thank you!)
on 18. November 2025, 16:14 by EdTheAlchemist
Valid point from marcmees (and it's correct)! I'll edit that when I get a moment.
on 18. November 2025, 15:33 by marcmees
Q: "in the same way" = cells on b/w dots only can see orthogonally, I suppose?
