Logic Masters Deutschland e.V.

Previous Dutch Flat Mate Puzzles
This has been a weekly series since '18 Oct 23'. Here is a spreadsheet link for all the previous puzzles in the series, which also has a few teasers for upcoming constraints/guest setters in the series (subject to change).

This alternative link offers a limited LMD search for Dutch Flat Mates.

To play the puzzle, please click the image:

Initial Setter Difficulty: 2.5-3 / 5

Normal Sudoku rules apply
Place the digits 1-9 so that they do not repeat in any row, column, or 3x3 box.

Dutch Flats
Every 5 in the grid must have a '1' directly above it or a '9' directly below it. It may have both, but it doesn't need both.

Nine Lines
Each line consists of one or more contiguous groups of cells, each of which sums to 9. These groups of cells cannot overlap. Digits may repeat on lines and even within sums.

Hint to start

You can work out the sum of the Box 5 line, which forces the number of segments of that line, and the sum of the line outties. The lines at the top of of Column 4 and the bottom of Column 6 are significantly impacted by this. Don't forget 5 only has one way to be happy in Row 1.