Logic Masters Deutschland e.V.

Normal Sudoku rules apply: Each row, column, and 3×3 box must contain the digits 1–9 exactly once.

Cells separated by a knight’s move in chess cannot have the same digit.

Difference Kropki dots (white): Cells joined by a white dot must have a difference of 1.

Ratio Kropki dots (black): Cells joined by a black dot must have a ratio of 2.

Renban lines (pink): Every Renban line contains a set of consecutive digits in any order, without repeats.

German whisper lines (green): Two cells connected by a German whisper line must have a difference of at least 5.

A V between two cells means the sum of the digits in those cells is 5.

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