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 clues along the edges tell you how many skyscrapers you can see from that vantage point. The red points in the near of crosses where four cells meet each other show that the cell with the red point is greater then the three other ones.

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 clues along the edges tell you how many skyscrapers you can see from that vantage point. The numbers between two cells give the difference of the heights.

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 will have exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. Heights of skyscrapers must be placed according to greater (>) and less (<) signs.

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 clues along the edges tell you how many skyscrapers you can see from that vantage point. Taking 180-degree rotational symmetry, the sum of mirrored skyscrapers must be 10.

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. There are no neighbouring houses with consecutive skyscraper heights. The clues along the edges tell you how many Skyscrapers you can see from that vantage point.

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row and column 3x3-box has exactly one of each digit. Each 3x3 box contains 3 digits once, 3 digits twice and 3 digits missing. The clues along the edges tell you how many skyscrapers you can see from that vantage point.

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 clues along the edges tell you how many skyscrapers you can see from that vantage point. The wheels in the grid contain each 4 values. These values will go in the cells the numbers are in. Doing this the wheels must be rotatated to the right position. (Not mirrored or changed the order of the digits.)

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 clues along the edges tell you how many skyscrapers you can see from that vantage point. There are 6 boxes with a plus or minus sign where the sum or difference of the number formed by the first two rows is equal to the number formed in the third row of the same box.

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 clues along the edges tell you how many skyscrapers you can see from that vantage point. Additional the rows form 9 correct arithmetic expressions reading from left to right.

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.