Logic Masters Deutschland e.V.

• Normal sudoku rules apply: Place the digits 1-9 once each in every row, column, and 3x3 box.
• Negators: Place 9 'Negator' cells in the grid so that there is exactly one Negator in every row, column, and 3x3 box. Each Negator cell must contain a different digit. The value of a Negator cell is equal to -1 times the digit it contains.
• Sandwich: Clues outside the grid indicate the sum of the values between the digits 1 and 9 (whether or not 1 or 9 are negated) in that row or column.

Solve in SudokuPad