Logic Masters Deutschland e.V.

Rules: Place a digit from 0 to 9 in every cell, so that no digit repeats in any row, column, or 3x3 region. Bold lines indicate the region boundaries. Cells that are on a bold line are simultaneously part of the regions on both sides of the line.
Restriction: Number the regions from 1 to 9, moving left to right, then top to bottom. (The top left region is 1, top right is 3, bottom left is 7, etc.) For each region N, it does not contain the digit N.
Cages: Digits in a cage sum to the number in the top-left corner of the cage.

Links:
SudokuPad: https://sudokupad.app/26h8vdid0m