Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 8 and a chess queen. No queens attack each other.

Fill in the grid so that every row, every column, and every colored region contains the digits 1 through 8 at most once.

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 4 x 2 box and both main diagonals contain the digits 1 through 8. 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, and every 3 x 3 box 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.

Fill in the grid so that every row, every column, 3x3 box and both diagonals contain the digits 1 through 9. The same digits can not touch each other diagonally.

Fill the grid with the digits 1 to 9. Each row, column and 3x3-box has exactly one of each digit. If the difference between two cells is 1 then there is a white dot. If digit in a cell is the half from a neighboring cell then there is a black dot. The dot between two cells with 1 and 2 can have any of these two colors.

Fill the grid with the digits 1 to 9. Each row, column and 3x3-box has exactly one of each digit. If the difference between two cells is 1 then there is a white dot. If digit in a cell is the half from a neighboring cell then there is a black dot. The dot between two cells with 1 and 2 can have any of these two colors.

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. The colored pyramids must contain each the digits 1 through 9.