Gray circles in gray fog
(Published on 6. May 2026, 20:13 by Lithium-Ion)
Normal Sudoku rules apply. Placing correct digits may reveal fog somewhere in the grid. Cells that are a knight's move (in chess) apart, are not allowed to contain identical digits. Cells connected with a gray circle have to contain digits that are consecutive or in a 1:2 ratio (or both). Box borders divide blue lines into segments with the same sum. Different blue lines can have different sums.
You can play this puzzle via the following link: https://sudokupad.app/qwm51fcrxg
Solution code: The digits in row 9, read from left to right.
Comments
on 17. June 2026, 18:10 by yuripuppies
Doable with a lot of effort if you're not comfortable with antiknight constraints, but probably fairly easy if you are. I liked box 4 in particular
on 23. May 2026, 01:59 by bleppie
Exellent puzzle. Tricky but satisfying knights-move logic towards the end. Thanks!
on 21. May 2026, 01:16 by itsid
That was super nice.
thank you for sharing
on 7. May 2026, 23:38 by HeyItsErin
Second half of this puzzle was harder than I expected but still very well done!
on 7. May 2026, 21:19 by SanFranSam
Very doable for me for a 2*. I give up half of the time. Did take me 32+ minutes.
on 7. May 2026, 11:08 by Silentdodo
gray-t idea and gray-t puzzle! love it
on 6. May 2026, 22:26 by dzamie
Nice! The anti-knight rule added a few bits of uncommon logic to the kropki stuff :D
on 6. May 2026, 22:10 by Myfyr MJ
Very nice puzzle. Reasonably easy.
on 6. May 2026, 21:16 by apothycus
an a-gray-able puzzle, very gray-tifying
