Logic Masters Deutschland e.V.

Rules:

Normal Sudoku rules apply.
The digits 1-9 are divided into x groups of arbitrary size (1 < x < 9). Identifying x and the digits in each group is part of the puzzle.
Digits must not repeat on the 4 grey lines. Every set of x connected cells on a line must contain one digit from every group.
Within each cage, digits must belong to the same group, and must sum to the number in its top-left corner (if given). The group for digits in one cage may be different than that for digits in another cage.
The inequality sign points to the smaller of the two digits.

Try it on the CTC app or on f-puzzles.

Puzzle: