Logic Masters Deutschland e.V.

Special Thanks
Thank you to palpot for setting this puzzle with me. We both really hope you enjoy it.

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: 3 / 5

Irregular Sudoku rules apply
Place the digits 1-9 so that they do not repeat in any row, column, or region.

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.

Outside
Digits outside the grid have to be placed in the first 3 cells in the corresponding row or column, but not necessarily in the order given.

Hint to start

Flat Mates! When 9 is unavailable, 5 needs a 1 to be a happy boi!

Guest Setter
Black_Doom is back, and he's playing hide and seek with Skyscrapers!