Logic Masters Deutschland e.V.

This puzzle has been my twelth feature on Cracking the Cryptic (click here to see Mark solving it). The main idea of this fog-of-war puzzle is the usage of gray circles which are either black or white Kropki dots. Feedback is always greatly appreciated! The rules are as follows:

Normal Sudoku rules apply. Placing correct digits may reveal fog somewhere in the grid. Cells that are a knight's move (in chess) apart, are not allowed to contain identical digits. Cells connected with a gray circle have to contain digits that are consecutive or in a 1:2 ratio (or both). Box borders divide blue lines into segments with the same sum. Different blue lines can have different sums.

You can play this puzzle via the following link: https://sudokupad.app/qwm51fcrxg