Logic Masters Deutschland e.V.

Modular lines: Along modular lines, every set of three consecutive cells has three different remainders when divided by 3.

X-sums: Numbers outside the grid give the sum of the first X digits along that row or column (the "X-sum"), where X is the first digit seen from the direction of the clue.

In addition to any modular lines revealed as the fog lifts, every X-sum forms a hidden modular line at least X cells long starting from the cell closest to the clue.

Kropki pairs: Digits separated by a black dot are in a 1:2 ratio. ALL blacks dots are given.

Fog: As correct digits are placed, fog will lift, potentially revealing more clues.

Try the puzzle on the Sudokupad app by Sven Neumann.

You can find a complete list of our puzzles on LMD here. Please also visit us at Missing Deck Puzzles.