Logic Masters Deutschland e.V.

Normal sudoku rules apply.

Each number next to a row refers to the square with a “5” in that row, and is the sum of all squares that are orthogonally adjacent to that square. Each number above a column refers to the square with a “4” in that column, and is the sum of all squares that are orthogonally adjacent to that square.

Example:

The puzzle:

Solving online: penpa