Logic Masters Deutschland e.V.

This puzzle was created for Scojo's weekly setting prompt featuring 'Sandwiches', and 'Negators'.
I hope you enjoy solving it!

Rules:

Normal sudoku rules: Place the digits 1 to 9 in each Row, Column, and 3X3 box.

Star Battle: Every row, column, and 3x3 box must contain exactly two stars. Stars cannot touch other stars, orthogonally or diagonally.

Negators: Every row, column, and 3x3 box must contain exactly one Negator cell. Cells with stars cannot contain Negators. Each Negator cell must contain a different digit. The value of a Negator cell is equal to -1 times the digit it contains.

Sandwich sums: Sandwich clues outside the grid indicate the sum of the Values between the two stars in that row/column.

Solve online: SudokuPad