Fill in the grid so that every row, every column, and every 3 x 3 box contains the numbers 1 through 9. The relation signs mark the relations between the sums of the numbers of the cages. In cages no number is repeated.

The colors only help to spot the cages.

Fill the grid with the digits 1 through 9. Each row, column and 3x3-box has exactly one of each digit. The coloured points tell you whether the sum in the marked cage is odd (yellow point) or even (green point). In cages there can't be the same digit repeated.

Fill the grid with the digits 1 to 9. Each row, column and 3x3-box will have exactly one of each digit. The numbers tell you the last digit of the sums of the marked cages. In cages 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 sum of two cells with a bold line between them is always the same, the so called magic number.

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 3x3 box contains the digits 1 through 9. The colored extra-regions must contain each the digits 1 through 9.

In each 3x3 box their is a differet rule to follow:

- Upper left - Consecutive Sudoku: All neighbouring cells with consecutive digits have a colored border.
- Upper centre - Killer <=>: Relation signs represent the relation between the sums of the digits in the sub-regions.
- Upper right - Greater/Less Sudoku: The inequality between each pair of digits must stand correct.
- Centre left - Arrow Sudoku: The digit in a circle is the sum of the digits which are marked with its arrow.
- Centre - Magical square: the sum of any row, any column and both main diagonals in this area is always the same.
- Centre right - Product Sudoku: Digits in a sub-region multiply up to the specified number.
- Lower left - Addoku: Digits in the outside equal the sum of the three numbers of the corresponding row or column in the contigous box.
- Lower centre - Killer: Digits in a sub-region add up to the specified number.
- Lower right - Sum Box Sudoku: First two row of numbers add up to the number formed on the third row.

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 digits in marked cages have always a sum that is a multiple of 7 (i. e. 7, 14, 21, 28, 35 or 42). In cages 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 digits in marked cages are the last digit of the sum of the digits in the cage. In cages there can't be the same digit repeated.