Logic Masters Deutschland e.V.

Normal Sudoku rules apply. Each row, column and 3x3 box contains each number from 1 to 9 exactly once.

German Whisper Sudoku rules apply. Two cells connected by grey line must have a difference of five or more between their digits.

Sandwich Sudoku rules apply. The numbers outside the grid show the sum of the digits sandwiched between 1 and 9 in that row or column.

The puzzle is also available online.