Logic Masters Deutschland e.V.

Rules:

Deconstruction: Place 9 nonoverlapping 3 cell by 3 cell boxes into the grid. All cells within a box contain a digit from 1-9 so that no digits repeat in any row, column, or box. For clarity, all cells not within boxes have values of 0. Cells with given digits contain that digit if inside a box.

Stations / Trees: 9 stations exist in 9 cells within the grid, all in different boxes and all with different digits. Cells with trees cannot contain stations.

Track: Draw an orthogonal track (a line) through the centers of some cells. The track does not branch, cross, or overlap itself, and goes through every station. Once the track passes through a station, it may not enter a cell with its digit again. Adjacent cells along the track differ in value by at least 5. The final 3 stations visited by the track are given.