Logic Masters Deutschland e.V.

Rules:
Fill each cell with a digit from 1 to 7. Every digit must appear once in any row or column. Every digit inside the grid represents a building with a specific height. The digits outside the grid indicates the number of buildings visible from that direction. In addition, some fields in the edge rows/columns are marked with circles. The numbers entered in these fields must show how many skyscrapers are visible from that place in the inner 5x5 square. All these fields are marked