Logic Masters Deutschland e.V.

This is our first puzzle, so any feedback is greatly appreciated!

Rules

Normal Sudoku rules apply. Digits in cages sum to the number in the top-left corner of the cage.

Draw a Slitherlink along the lines of the grid that passes through every cage (just touching an edge of a cage is not sufficient). 1s, 2s, and 3s are normal Slitherlink clues. 4s are 0s for the purposes of Slitherlink.
(Slitherlink rules: draw lines along the grid to make one continuous loop that never crosses itself and never branches. Each clue indicates how many lines surround its cell.)

Regions formed between the outer edge of the grid and the Slitherlink contain no 2x2 areas and have no repeated digits. (The Slitherlink may still run along the outer edge.)

Adjacent digits separated by an X sum to 10. ALL Xs are given, EXCEPT for any that lie on the Slitherlink.

Puzzle: CtC