Logic Masters Deutschland e.V.

A foggy knight

(Published on 2. January 2026, 05:51 by DarthSillious72)

Normal Sudoku rules apply. The grid is covered in dynamic fog. Placing correct digits may clear fog somewhere in the grid. Correct digits may not clear fog from their own cells. Digits a chess king’s or knight’s move apart must be different. Cells separated by an X sum to ten, cells separated by a V sum to five. All X and V are given. Orthogonally adjacent cells cannot be consecutive. The indicated diagonals sums to the total given. Cells within a cage sum to the given total. https://sudokupad.app/6dz09zs0k4

Solution code: The middle row of the puzzle.

Solved by thomamas, allama, milxqueen, maniacaljackal, xingyun, lina_hyena, ragmat12, superkinkel, jalebc, jkuo7, mcc, Voragine, abs, Fizz, JustDoggy, GD_jacky, pjot, plinke, zrbakhtiar, luisdcnt, Tritium, ... rcg, DaFunkyMonk, Raistlen, polyraroh, BlackApolloX, ciaragst, kross, damasosos92, Kenji769, koiking, paranoid, FischProf, xrrx, peznut, patolucatis, Terrapin, antzervos, Chilimy, filz, Jultrza
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Comments

on 6. January 2026, 20:44 by CitrusGremlin
am I supposed to assume that all X's and V's have been revealed at the start of the puzzle? Or do I have to wait until the whole fog clears to use the negative constraint?

on 3. January 2026, 15:00 by Gribba Bibba
Very quick and easy. The cages are not necessary, the chess moves and negative constraint can carry the solving after the first few fog reveals.

on 2. January 2026, 20:46 by Myfyr MJ
Nice snack break puzzle. Dynamic fog makes it tricky at times.

on 2. January 2026, 13:44 by pjot
Easy break-in but almost too many constraints at the end. I was ahead of the fog a lot of the time

on 2. January 2026, 07:59 by DarthSillious72
Yeah, this definitely isn’t my best puzzle. I’ve made quite a few others with XV constraints that are much better. But this one was still fun to make

on 2. January 2026, 07:18 by ragmat12
Great puzzle, easy to get through once you understand the negative constraint.

As you go through the puzzle, however, you can get through it without using all the features for e.g. the killer cages (i.e. heavily rely on the knights and king's moves).

Difficulty:1
Rating:76 %
Solved:164 times
Observed:1 times
ID:000QSY
Puzzle variant Variant combination Online solving tool Shading puzzle Chess
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