Logic Masters Deutschland e.V.

Rules: Normal Sudoku rules apply. Put the digits 1 to 6 once each into every row, column and 2x3 box.
Doublers: One cell in each row, column and box is a doubler cell. Every digit appears once each in the set of doubler cells. A doubler cell has value equal to twice its digit for the following rules (every other cell has a value equal to its digit).
Palindrome Lines: Two cells an equal distance away from the centre of a gray palindrome line have the same value.
Look-and-Say Cages: A clue XY in the top-left corner of a cage indicates that the value Y appears X times in the cage. For example, a clue of 56 would indicate that there are 5 cells in the cage that have value 6.

Links:
SudokuPad: https://sudokupad.app/5pcsxorafp