Logic Masters Deutschland e.V.

This puzzle is my humble contribution to Flinty's amazing Dutch flat mates series. If you haven't had the pleasure of experiencing them yet, I highly encourage you to do so— you'll find the entire series linked below.

Note that I've made a slight adjustment in the Dutch flat mates rule (with Flinty's approval) to better align with the Ying Yang rules.

Rules:

Normal Sudoku rules apply. Place the digits 1-9 once in each row, column, and 3X3 box.

Yin and Yang:
Shade some cells such that all shaded cells are orthogonally connected and all unshaded cells are orthogonally connected. No 2x2 area may be fully shaded or fully unshaded.

Digits in a cage cannot repeat. Digits in shaded cells inside a Cage sum to the clue in the top left corner of the cage.

5s live in Dutch Neighborhoods.
All 5's in the grid must have a shaded '1' or an unshaded '9' orthogonally adjacent to them. It may have both, but it doesn't need both.

Solve online: CTC, f-puzzles

Previous puzzles in the Dutch Flat Mates series:

• Classic
• Thermometers
• German Whispers
• Region Sum Lines
• Sandwich Sums
• Little Killer
• Kropki
• Zipper Lines
• Renban - By GoodCity
• Nabner - By GoodCity
• Skyscrapers - By GoodCity
• Dutch Whispers
• Killer Cages
• Arrows
• Ten Lines
• 159 and Even - By GoodCity
• Friendly Cells
• Quads
• Silent Killer - By GoodCity
• XV and Equality
• X-Sums
• Numbered Rooms - By GoodCity
• Diagonal X-Sums