Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The same digits can not touch each other diagonally. The clues along the edges tell you how many skyscrapers you can see from that vantage point.
Fill in the grid so that every row, every column, every 3x3 box and both diagonals contains the digits 1 through 9. Moreover all pairs of diagonally adjazent cells must be different.
Fill in the grid so that every row, every column, 3x3 box and both diagonals contain the digits 1 through 9. The same digits can not touch each other diagonally.
Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. Equal digits can be neither orthogonally nor diagonally adjazent.