Logic Masters Deutschland e.V.

Normal Sudoku rules apply.
Killer Sudoku rules apply. Digits can not repeat in cages.
All cage values are unique. They reach from 2 to 28.
Grey squares are even.
A white dot is placed between 2 neighbouring cages if they have consecutive sums (e.g. a 15 cage next to a 14/16 cage will have a dot). All white dots are given.
A black dot is placed between 2 neigbouring cages if their sums have a 1:2 ratio (a 12 cage next to a 6 or 24 cage will have a dot). All black dots are given.
The 0 outside the grid is the sandwich sum for the digits between 1 and 9 for that row

Puzzle