Logic Masters Deutschland e.V.

Normal sudoku rules apply.

A number outside the grid is the sum of all the digits between the 7 and the 8 in the corresponding row or column.

Pick any square with a 6 and the sum of all squares that are orthogonally adjacent to that square will always be 9.

Example:

On the left we see that the numbers between the 7 and the 8 adds up to 3.

At the bottom we see that all the numbers orthogonally adjacent to the 6 adds up to 9.

The puzzle:

solving online: penpa