Logic Masters Deutschland e.V.

Normal Sudoku rules apply.

5's live in Dutch Flats
All 5's in the grid must strictly have EITHER; a '1' directly above it AND/OR a '9' directly below it. It may have both, but it doesn't need both.
Examples provided below on an empty grid.

Zipper Lines:
Pairs of digits an equal distance from the centre of a Zipper Line sum to the same total. For odd-length lines, the total is the digit placed in the line's central digit.
Digits may repeat on a Zipper Line.

For convenience, centres of:
- Odd-length lines are highlighted with a bump/dot.
- Even-length lines are highlighted with a diamond.

Play CTC

Previous puzzles in this series:
Dutch Flat Mates 1: Classic
Dutch Flat Mates 2: Thermometers
Dutch Flat Mates 3: German Whispers
Dutch Flat Mates 4: Region Sum Lines
Dutch Flat Mates 5: Sandwich Sums
Dutch Flat Mates 6: Little Killer
Dutch Flat Mates 7: Kropki
Dutch Flat Mates 8: Zipper Lines
Dutch Flat Mates 9: Renban (13 Dec) - GoodCity

Thanks for playing the puzzles in this series. GoodCity has sent me a really good Renban version; and barring any issues I'm hopeful they will share it with you in the usual time slot next week. :)