Logic Masters Deutschland e.V.

Rules:

Normal sudoku rules apply.

Shade nine cells in the grid such that there is one shaded cell in each row, column, box and position within a box (positions in a box are read from left to right and top to bottom).

The first digit in each row indicates the position of the shaded cell in that row, and the first digit in each column indicates the position of the shaded cell in that column.

The digit in each shaded cell is equal to its position in its box.

Digits separated by a white dot are consecutive.

Digits separated by a black dot have a 1:2 ratio (i.e. one digit is double the other).

Digits separated by a king's move must be different.

Links:

If you like a challenge, you can try a harder version with only a single white dot (same solution)

Enjoy!