Logic Masters Deutschland e.V.

That puzzle uses the same rule set as my last puzzle. I assess its difficulty level to be slightly harder at a solid four stars.

RULES

Chaos Construction: Divide the grid into nine orthogonally connected 9-cell large non-overlapping regions. Place the digits 1-9 once each in every row, column, and region. The region border already placed in the grid must be respected.

Second Region X-Sums: Clues outside the grid indicate that the second region segment seen from that side contains X digits where X is the first digit seen from that side. The clue itself is equal to the sum of the digits in the second region segment.

Question Mark: A question mark ‘?’ represents an unknown positive number.

This is a 6x6 example to help illustrate the rules.

For instance, the 15 clue in row 3 indicates that X is the first digit seen in that row from that side (X = 4) and that the second region segment contains X digits that add to a value equal to the given clue (3 + 5 + 1 + 6 = 15).

I appreciate solves, comments, and suggestions

Solve the puzzle at Penpa+ with answer check. To trigger the answer check you must fill all the digits and delineate the region borders using green edges. Don't forget to place a green edge on top of the bold edge already in the grid (column 2) or the answer check won't trigger.