Logic Masters Deutschland e.V.

Someone has stolen the Mona Lisa again - all that is left is her enigmatic smile.

Normal Sudoku rules apply.
Purple lines are zipper lines, where the cells equidistant from the centre of the line (given by the dot on the line) sum to the same value. For odd length lines, the cell with the circle is the sum; for even length lines the pair either side of the circle is the sum.
Green lines are German Whisper lines, where adjacent calls have a difference of at least 5.
Black dots join two cells with one twice the other. Diagonal black dots do this with diagonally adjacent cells. Not all given.

Solve on Sudokupad