Logic Masters Deutschland e.V.

Negative Gifts by Patrick Junke

Link to try the puzzle in the CTC application

Place 1-9 in each row, column, and marked region.
All instance of five of the nine digits, to be determined, constitute an area of orthogonal cells, a "labyrinth".
The other four digits are considered "wall" cells.
An arrow appears in a "dead end" of the labyrinth pointing to the only way out, i.e. the only labyrinth cell to which it is connected.
A 2x2 square containing only labyrinth has a blank square in the middle.
A 2x2 square containing only wall cells has a black square in the middle.
An X join two cells that sum to 10. It happens that they are always between a labyrinth and a wall.
A white dot join a labyrinth and a wall cell if digits in those are consecutives.
All arrows, X's, white dots, and squares are given.