Logic Masters Deutschland e.V.

Rules: In each of the four grids, put the digits 1 to 6 once each into every row, column and 2x3 box.
Modifiers: In each grid, one cell in each row, column and box is a modifier cell, and the set of modifier cells contains the digits 1 to 6 once each. Modifier cells are in the same relative position in each grid. For example if R1C1 was a modifier cell in one grid, then it would be a modifier cell in all grids. Each of the following modifier types appears in one of the grids. Which grid contains which modifier type is to be determined.
Negators: The value of a negator cell is equal to the negative of its digit.
Halvers: The value of a halver cell is equal to half of its digit.
Doublers: The value of a doubler cell is equal to twice its digit.
Triplers: The value of a tripler cell is equal to three times its digit.
Cages: Digits in a cage can't repeat. Values in a cage add to the total in the upper left corner of the cage. Some totals have been replaced with letters. Cages with the same letter have the same total. Cages with different letters have different totals.

Links:
SudokuPad: https://sudokupad.app/zqz141xelm