Logic Masters Deutschland e.V.

Rules:

• Normal 9x9 sudoku rules apply:
  In every row, column and in every 3x3 box the digits from 1 to 9 have to appear atleast once.
• Anti-knight:
  Cells seperated by a knight’s move in chess cannot have the same digit.
• Difference kropki:
  Cells with a white kropki between them are consecutive.
• Ratio kropki
  Cells with a black kropki between them are in a ratio of 1 to 2. Wich means you have the following posibilities, 1-2, 2-4, 4-8 and 3-6.

Play the puzzle here online:

Sirxemic’s Sudokumaker

Sven's Sudokupad

Have fun and leave a nice message :D.