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.
• Global entropy:
  Every 2x2 square of cells must contain a low digit (1,2,3), middle digit (4,5,6) and high digit (7,8,9).
• 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.
• Sandwich sum:
  Clues on the edge of the grid show the sum of the digits sandwiched between the 1 and the 9 in that row or column.

Play the puzzle here online:

Sirxemic’s Sudokumaker

Sven's Sudokupad

Have fun and leave a nice message :D.