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: 2-2.5 / 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.

Confetti Sums
In ALL cases where the sum of two horizontally or vertically neighbouring digits is A or B; a circle is given. A and B stand for different numbers to be deduced
- White is always A
- Black is always B
- Grey is ambigous, and is either A or B.

Hint to start

A and B are heavily restricted by maths/options in Boxes 2 and 8, with Flat Mates in C5 being the key. The negative constraint is hugely powerful throughout the solve.

Guest Setter
Another series debutant next week, another "A-Tier Setter" series debutant at that! Qodec with Between Lines!

Busy Week For Flat Mates
The wonderful puzzle pack Zodiac x Flat Mates from ViKingPrime had a small issue with Puzzle 6. This has been resolved and I do hope you give it another try!

We also had bonus Flat Mates from aqjhs in the form of a CTC Discord Secret Santa gift for me which is great and well worth checking out: Dutch Flat Mates: Dual Duel. As well as the Scojo Discord Prompt "Wheel" spinning Squisdoku and Flat Mates, so puzzles with those combinations should be making an appearance on LMD.