Logic Masters Deutschland e.V.

This is the third puzzle I constructed with this variant I came up with. I highly recommend setting a puzzle with this variant, especially if you like puzzles involving math because you can explore all sorts of relationships between numbers and operations. You can find the first and second puzzles here and here.

Rules:

1) Standard Sudoku rules apply:
Place the digits 1-9 into each cell of the grid. None of the rows, columns or boldly outlined 3x3 boxes contain repeated digits.

2) Mystery Kropki Sudoku rules apply:
The digits in two cells separated by a...

-white dot have a fixed difference.
-black dot have a fixed ratio. (The ratio is not necessarily an integer, it could be any rational number.)
-blue dot have a fixed sum.
-red dot have a fixed product.

The negative constraint does not apply: Two cells without a dot between them might contain digits that allow a dot between them.

You can try this puzzle here. As usual, all comments and ratings are always welcome.

I am not a native German speaker, I just use the translations of Google Translate. Therefore, corrections on the German text are highly appreciated.