Foggy Residue
(Published on 24. January 2025, 04:47 by timotab)
- Normal Sudoku rules apply: place the digits 1-9 in every row, column, and box, without repetition.
- Dynamic Fog: The grid is partially covered in fog. When all initially-unfogged cells have correct digits, the fog in the rest of the puzzle will clear. No guessing is necessary.
- Quadruples: Digits in the circles must all appear at least once in the cells touching them.
- Global modulo-3: Every 2x2 in the grid contains at least one digit from each of the modulo-3 residue class sets: {1,4,7}, {2,5,8}, {3,6,9}
As well as setting puzzles, I also solve puzzles on YouTube. Please check it out!
Solution code: Column 9
Comments
on 6. February 2025, 21:36 by Friedhelm
One of my first modulo-puzzles. Had to fight up to the very last digit.
Had been great fun! Thanks!
on 28. January 2025, 21:38 by AlSina
Very nice and fun puzzle! great pattern as well :)
on 26. January 2025, 17:40 by Chinea
Very fun pattern!
on 25. January 2025, 02:48 by mvondras
I really like this puzzle but the dynamic fog is a dirty trick :)
on 25. January 2025, 00:05 by Bellsita
Beautiful easy puzzle! I had a lot of fun!
on 24. January 2025, 18:53 by gbrljt
Didn't regret coloring in this one!
on 24. January 2025, 15:42 by NotSoMagnifique
What a wonderful way to get a primer on quattros!
on 24. January 2025, 14:06 by the_cogito
Lovely puzzle, super smooth and a nice execution!
on 24. January 2025, 12:11 by Lorena
Straightforward puzzles like this one make you feel like you understood the assignment, which is a lovely sentiment in an uncertain world. Thank you.
on 24. January 2025, 10:58 by Runald Waschlap
nice pattern evolving
on 24. January 2025, 09:23 by v8nagrom
Fun puzzle but I don't get the final message. My bad :)
on 24. January 2025, 06:48 by joshandreassen
Excessive pencil marking screwed me - just trust in the logic!
on 24. January 2025, 05:28 by MattYDdraig
Really enjoy this use of the fog.
on 24. January 2025, 05:16 by the_cogito
Lovely puzzle, super smooth and a nice execution!
