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This is a combination of some sudoku variants.

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. The grid must fulfill the following rules:

• Sudoku X: The both main diagonals contain each the digits 1 through 9.
• Sum Search Sudoku: The equal signs mark the relations between the sums of the digits of the cages. In cages there can't be the same digit repeated.
• Arrow Sudoku: The digit in a circle is the sum of the digits which are marked with its arrow.
• Ratio Sudoku: The fractions between two cells give the ratio of the digits. For example 2/3 can stand for the following combinations of numbers in the adjazent cells: 2 - 3, 4 - 6, 6 - 9, 3 - 2, 6 - 4 and 9 - 6.
• Wheel Sudoku: 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 in the grid so that every row, every column, and every 3 x 3 box contains the digits 1
through 9.

A red arrow means that the digits are going up till they hit this number and for a cyan arrow
they go down till they hit this particular number.

For example:

135247896 could get a red arrow with a 5 or a cyan arrow with a 1.

932415678 could get a red arrow with a 9 or a cyan arrow with a 2.

The sums of the digits within each sub-region are equal to each other. In sub-regions there can't be the same digit repeated.

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 sums of the digits within each sub-region are equal to each other. In sub-regions there can't be the same digit repeated.

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. The sums of the digits within each sub-region are equal to each other. In sub-regions there can't be the same digit repeated.

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. The sums of the digits within each sub-region are equal to each other. In sub-regions there can be the same digit repeated.