Logic Masters Deutschland e.V.

This puzzle was created for Scojo's weekly setting prompt featuring 'Split Pea Lines' and 'Global entropy'.
I hope you enjoy solving it!

Rules:

Normal sudoku rules: Place the digits 1 to 9 in each Row, Column, and 3X3 box.

Split Pea Lines: The sum of digits in cells connecting two circles is equal to a concatenation of the digits in the circles, in some order. For instance, 3-346-1 could be a valid line, as 3+4+6=13=1 concatenated with 3.

Global entropy: The low digits (1, 2, 3), middle digits (4, 5, 6) and high digits (7, 8, 9) are defined as three different groups. In the finished grid each 2x2 box has to contain at least one digit of each group.

Solve online: SudokuPad