Logic Masters Deutschland e.V.

Happy new Year!

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.

Clarification if you can't tell the colors apart: all of the clues by the right half of the grid are blue and the 6 on the left is blue, all other clues by the left half of the grid except the 6 are red.

Try it online here.

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Twenty-three

Let it snow, let it snow, let it snow!