Logic Masters Deutschland e.V.

• Normal sudoku rules apply: Each row, column, and region indicated by thick borders in the grid must contain the digits 1 to 9 once each.
• 159: Digits in column 1 indicate the column in which the digit 1 appears in that row (e.g. if r4c1 is a 6, r4c6 is a 1). The same is true of column 5 and the digit 5, and column 9 and the digit 9.
• Kropki pairs: A black dot between two cells means that one of the digits in those cells is exactly double the other. A white dot between two cells means that the two digits in those cells must be consecutive. Not all possible dots are necessarily given.

You can play this puzzle online using:

• CTC app: https://tinyurl.com/uexvfw
• f-puzzles: https://f-puzzles.com/?id=ydsx7yej

Hope you'll enjoy!