Logic Masters Deutschland e.V.

Rules: Normal sudoku rules apply. Digits connected by a white dot must be consecutive. Digits connected by a black dot must have a 1:2 ratio. Not all dots are necessarily given.

Connect some cells in the grid so they form an orthogonally connected loop that does not touch itself orthogonally or diagonally. The loop must pass through exactly one digit in each kropki pair. Additionally, at least one of the digits on a kropki pair will give the number of loop cells in the (up to) 9 surrounding cells, including itself (this digit may or may not be the cell that the loop is passing through).

F-puzzles link: https://f-puzzles.com/?id=2muduy7f
SudokuPad link: https://tinyurl.com/ywp7aukb