Foggy Regional Constraints
(Published on 11. April 2025, 21:08 by Belamis)
Sudoku: Normal Sudoku rules apply.
Dynamic Fog: The grid is partially covered in dynamic fog. Correctly placed digits may remove fog from other cells.
German Whispers: Along green lines, digits must differ from their neighbors by at least 5.
Killer: Digits do not repeat in cages, and sum to the small clue in the top left corner if given.
Renban: Purple lines contain a non-repeating set of consecutive digits in any order.
Parity: Along a peach line, adjacent digits must alternate between odd and even.
Kropki: Digits in cells separated by a black dot have a 1:2 ratio.
Constraint Regions: Each constraint type may contain no repeated digits anywhere in the puzzle. E.g. ALL renban cells must contain no repeated digits, ALL cells connected by a kropki dot must contain no repeated digits etc.
Solution code: Row 6
Comments
on 16. June 2025, 12:53 by mezkur7
Great puzzle. Would be a lot easier for me if you used red for the parity line instead of peach. I got stuck thinking those were entropic lines.
on 11. May 2025, 07:02 by OffbeatFly
The last clue made me smile! Very nice puzzle!
on 25. April 2025, 10:28 by PhilTheChill
Such a great puzzle! Great mix of figuring out clues and doing actual Sudoku. The last clue was definitely the cherry on the cake and made me laugh! :D
on 22. April 2025, 19:01 by dzamie
Oh that's so cool. Really adds an extra layer to the usual rules, lots of fun to solve. The very last clue revealed was a great way to finish it off, too - nearly laughed when it showed up!
on 16. April 2025, 08:42 by SirRanch
I really enjoyed your standard regional constraint puzzle. So I knew I had to try the foggy version as soon as I saw it. Thanks for the fun puzzle!
on 14. April 2025, 22:42 by mightcould
Great fun!
on 13. April 2025, 15:38 by wuc
Great episode puzzle with waving difficulty. Great use of dfog. Great fun thx.
on 13. April 2025, 11:43 by antiknight
Great!
on 13. April 2025, 09:15 by PancakePie
What a beautiful puzzle! You have expanded on this new approach to a ruleset and somehow, so quickly, made it even more beautiful and fluid! Amazing. Thank you!
on 13. April 2025, 07:09 by virus_dave
Absolutely beautiful puzzle. Loved it. Thank you!
on 13. April 2025, 02:13 by SnS
SO good!
on 13. April 2025, 00:02 by Ragna
That is the best FOW puzzle I ever solved! Very clever and elegant. Thank you. :-)
on 12. April 2025, 21:56 by SuperCoolGuy
Outstanding!
on 12. April 2025, 18:18 by Martina
Love it, very clever.
on 12. April 2025, 11:44 by Snaques
What an absolute gem of a puzzle!
I usually don't like it when the fog *may* disappear but in this one it was so clearly part of the story telling that it made complete sense.
on 12. April 2025, 11:28 by Franjo
Amazing! I give 3* of difficulty for those people who didn’t solve your first puzzle with the same ruleset (without the fog). Thank you very much for creating and sharing both.
on 12. April 2025, 09:07 by mvondras
Took me longer than it should have to find the break in. Every time I got stuck, some nice bit of logic carried me through. Great puzzle.
on 12. April 2025, 07:39 by Fizz
Very cool puzzle, well thought through all the way through the end. Thanks!
on 12. April 2025, 04:11 by efrena
What a great puzzle! I had so much fun solving it!
on 12. April 2025, 03:44 by rameshsrivats
Cool puzzle
on 12. April 2025, 02:46 by Jackler
Really smooth little brain teaser
on 12. April 2025, 01:06 by sujoyku
Simply beautiful! I loved that finale. The constraint extra-regions are such a fun variant and the execution with the fog was perfect. Thank you for this gem, Belamis!
on 11. April 2025, 23:42 by hardline35
Such a unique rule! Very fun puzzle, thank you.
on 11. April 2025, 23:39 by cg24
beautiful puzzle, lovely logic and as gdc mentioned great use of the dynamic fog constraint :)
on 11. April 2025, 23:05 by gdc
always like if constructors use dynamic fog for something that would never be possible without it and this is a good example of that. Thanks for setting!
I didn't find this one particularly hard since the signaling with the few revealed clues was excellent. 2 stars at most.
on 11. April 2025, 23:02 by Deklok
Beautifull puzzle, really loved every step! Thank you
on 11. April 2025, 21:42 by keesh
Another puzzle to make me feel clever!
