Logic Masters Deutschland e.V.

Normal Sudoku rules apply: each row, column, and 3×3 box contains the digits 1-9 exactly once. Additionally:

30 circles must be paired and connected by orthogonal paths such that:
• Adjacent circles cannot form a pair.
• Paths do not overlap and together cover the grid.
• No U-turns, i.e., no immediate double left/right turns.
• Each path is a Between Line: digits are strictly between its endpoints.
• This means, unlike standard Number Link puzzles, the digits in the endpoints of each path are always different.

Example (6×6):

• Digits separated by a white dot are consecutive.
• Digits separated by a black dot are in a 1:2 ratio.
• Not all dots are necessarily given.

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Here you can solve the puzzle online: Solve on SudokuPad

The difficulty is probably 4-5 stars. I wish you joyful solving!