Logic Masters Deutschland e.V.

Normal Sudoku rules apply.

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

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

Dutch whisper lines (orange): Two cells connected by a Dutch whisper line must have a difference of at least 4.

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.

Created by Ivayla Gergova for the Sudoku Competition celebrating 50 Years of Mathematics at South-West University "Neofit Rilski" in Blagoevgrad, Bulgaria.

Play online in SudokuPad.