Logic Masters Deutschland e.V.

Rules:

Numbers may not repeat inside cages; the sum of the digits inside a cage is given in the top left corner of the cage. The cage at the bottom is there only to complete the storm.

Numbers outside the grid give the sum of the numbers along their diagonals.

The cell in R1C1 is a minimum cell: the number in this cell is less than its orthogonally adjacent cells.

Additionally, the central box is a magic square: each of the rows, columns and diagonals inside the box have the same sum.

f-puzzles link

Note: f-puzzles.com does not check for the magic square constraint.