Logic Masters Deutschland e.V.

This is one of first puzzles I ever made. It's so good that words can't even describe it. No introduction is needed, because it speaks for itself. Enjoy :)

Rules:

Normal sudoku rules apply.

Digits within a cage cannot repeat and must sum to the number in the top left corner.

The green boxes are magic squares, the red boxes are not magic squares, and the yellow box may or may not be a magic square (this is to be determined by the solver).

All digits follow a knight's move constraint except the digits 4 and 5 (but the 8 in r5c2 is allowed to be a knight's move away from the 8 in r3c3, and the 7 in r9c3 is allowed to be a knight's move away from the 7 in r8c5).

Try to find both of the two possible solutions.

You can solve the puzzle on F-puzzles.