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.
• Between lines: Digits on a line connecting two circles must be strictly between the digits in those circles. (I.e. the digit in one circle is greater than all digits on the line, while the digit in the other circle is smaller than all digits on the line.)

You can play this puzzle online using:

• CTC app (Sudokupad): https://tinyurl.com/58ysyjdy
• f-puzzles: https://f-puzzles.com/?id=27adp8w7

Initially I intended to use the break-in for this puzzle to give to others as a kind of exercise or maybe a contest, so that people could compare their results and discuss different approaches. But I had to know first how hard it would be, so I made this example puzzle for myself. Then forgot my intention and gave it to testers... which immediately defeats the original purpose. I'll have to try again later.

Fortunately, I think this puzzle has enough merit for publication over here. So I hope you'll find it a fun solve.