Entropic Filter
(Published on 17. January 2026, 08:42 by cygne)
Entropic Filter by Cygne
Rules
- Normal Sudoku rules apply.
- Global Entropy: Every 2x2 area in the grid contains at least one low digit (1,2,3), at least one medium digit (4,5,6) and at least one high digit (7,8,9).
- German Whispers: Adjacent digits along a green line must differ by at least 5.
- V-Sums: Digits separated by a V sum to 5.
Play in SudokuPad
I am still obsessed with interactions between Entropy and Whispers, but this time I decided to use global Entropy rather than Entropy lines, and was able to achieve a much sparser grid than my usual. If you enjoyed this one, please consider trying out these prior ones with this theme:
Solution code: Row 5 digits, left to right
Comments
on 21. January 2026, 20:45 by brskri
Agree with previous commenter, this could be anywhere from 2* to 4* depending on how good you are at scanning global entropy. Enjoyable puzzle!
on 20. January 2026, 10:20 by snuuba
Quite fun, although I suck at scanning global entropy. Many thanks.
on 17. January 2026, 19:03 by Exigus
Great combination of whispers and global entropy. Thanks!
on 17. January 2026, 16:49 by Fizz
That was quite difficult for me and I had to use an extensive system for tracking the different possibilities. Still, this was very fun. Thanks for the awesome puzzle!
