Mod 4 Fog of War Dinosaur
(Published on 29. June 2024, 01:15 by yanggang)
Normal sudoku rules apply.
Mod-4 Counters: Circled digits indicate how many of the up to 9 cells surrounding the circle (including itself) have the same value modulo 4 as itself. E.g., a circled 2 would count how many of the surrounding digits are from the set {2, 6}. Not all such circles are necessarily given.
Fog of War: The grid is partially covered in fog. Correctly placing digits will clear the fog around that cell. No guessing is required.
Example for reference:
If you enjoyed this puzzle, check out Mod 3 Singularity, a similar fog of war puzzle where the circles count mod 3 instead. Also, look out for an upcoming mod 5 counting circle puzzle which will complete the series.
Solution code: Column 9
Comments
on 8. July 2024, 16:14 by wuc
Im a fan of this series. Another nice puzzle. Such a smooth solve thx.
on 8. July 2024, 00:04 by Hagemann
Amazing puzzle!
on 1. July 2024, 23:11 by Flinty
Lovely puzzle.
on 1. July 2024, 23:10 by lmdemasi
Loved the constraint, what a cool idea!
on 30. June 2024, 10:10 by Snookerfan
Very nice and smooth! Thank you
on 29. June 2024, 11:30 by sanabas
@Gilliatt I had the same issue of both paths seemingly being fine, as there's nothing visibly wrong with what you've got. But there is something under the fog that makes it impossible. There's a digit outside that section you've filled in that is forced, and the fog revealed by that resolves your issue.
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Reply: Yep, that's right. No guessing is required for any step.
on 29. June 2024, 07:30 by rameshsrivats
Smooth!
