Fill in the grid so that every row, every column, and 3x3 box contains the digits 1 through 9. In the marked diagonals all digits must be different.

Fill in the grid so that every row, every column, and 3x3 box contains the digits 1 through 9. In the marked diagonals all digits must be different.

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 and 3x3 box contains the digits 1 through 9. Each marked diagonal must contain the digits 1 through the number of cells in this diagonal. (1 - 4, 1 - 6 or 1 - 9 respectively)

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. Each number inside the blue cells must be no larger than the number of blue cells in its 3x3 block - the same as the given within that block. Each major diagonal also contains the numbers 1-9. Note that the 9 givens make a magic square.

Fill in the grid so that every every 3x3 box contains the digits 1 through 9. Moreover all 18 diagonals of 9 cells (marked in the coloured diagrams with the same color) contain the digits 1 through 9.

It is allowed that numbers in a row or in a column are equal.

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, every 3x3 box and both diagonals contains the digits 1 through 9. The algraic operations in the cells must be fullfilled.

Fill in the grid so that every row, every column, every 3 x 3 box and both diagonals contain 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.

Fill in the grid so that every row, every column, every 3 x 3 box and both diagonals contain 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.