Logic Masters Deutschland e.V.

I made a puzzle for my birthday again. I can hardly believe it's been another full year already.

If you could try some of my other puzzles as well, like these ones, I would greatly appreciate that!
Kropki-Masyudoku
Aesthete (doublers)
Christmas theme sudoku
Halloween themed encrypted Shifted x-sums
Whispering Worms
Fletcher's Apprentice

Try it online here.

Rules:
Normal sudoku rules apply.
Red clues are sandwiches, i.e. they indicate the sum of the digits between the 1 and the 9 in the corresponding row or column.
Blue clues are X-sums, i.e. they indicate the sum of the first X digits in the corresponding row or column, where X is the digit in the first cell.
Black clues are both sandwiches and X-sums at the same time.