Logic Masters Deutschland e.V.

All aboard for another global entropy puzzle!

Rules:

- Normal sudoku rules apply.

- Global entropy - every 2 x 2 box of cells must have at least 1 low digit (1,2,3), 1 middle digit (4,5,6), and 1 high digit (7,8,9).

- XV sums - digits separated by X sum to 10; digits separated by V sum to 5. No negative constraint.

- Ratio Kropki dots - digits separated by a black Kropki dot have a value ratio of 1:2. No negative constraint.

- Dutch Whispers - digits along a dark pink/salmon-colored Dutch Whisper line must differ in value from their neighbors on the line by at least 4.

- Palindrome - digits along a gray palindrome line must read the same backwards and forwards.

Sudokupad link