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 numbers tell you the sum of the marked cages. The clues along the edges tell you how many skyscrapers you can see from that vantage point. The cells on both diagonals have odd digits. In cages there can't be the same digit repeated.

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. Some rows and columns have numbers. They represent the sum of the two ends.

Fill in the grid so that every row, every column and both diagonals contain the digits 1 through 9. Each blue line marks that the sum of the two neighbored cells is 11.

Fill the grid with the digits 1 to 9. Each row, column and 3x3-box has exactly one of each digit. Taking 180-degree rotational symmetry, the sum of mirrored cells must be 10.

Fill in the grid so that every row and every column contains the digits 1 through 6. The 7's are the sum of the digits in adjazent cells.

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. The numbers are the sum of the digits in adjazent cells.

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. The given numbers are the sum of the digits in all adjazent cells. A clue-number ist either the sum of two or four numbers.

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. The specified numbers are equal to the sum of there horizontally and vertically adjazent cells. (There is no extra constraint that they must be different.)

Fill in the grid so that every row, every column, and every outlined region contains the digits 1 through 9. The sum of the digits within each sub-region is equal to the specified number. No digits can be repeated in any cage.