Logic Masters Deutschland e.V.

This puzzle is a variant of a Kropki Sudoku.
rule:

1. Standard Sudoku rules apply;

2.Variant Dots rules: A gray dot between cells indicates cell values with an N:1 ratio (N is a positive integer). All dots are shown.

Here is a picture showing which two numbers have gray dots in the middle：

Penpa link.Have fun solving!

CTC link. Have fun solving!

It's a little bit difficult this time. I hope you like it.

Your feedback and comments are highly appreciated :) Enjoy !