Fill in the grid with the digits 1 through 9. Each number should be used only once. The number in the coloured square is the sum of the four adjazent cells. The arrows show the biggest of the four adjazent digits.

Fill in the grid with the digits 1 through 9. Each number should be used only once. The number in the coloured square is the sum of the four adjazent cells. The arrows show the biggest of the four adjazent digits.

Fill in the grid so that every row contains the digits 0 through 9. In columns the numbers may be repeated. The bottom numbers give the sum of the column. Adjazent cells, even diagonally adjazent cells, must be different.

Fill in the grid so that every row contains the digits 0 through 9. In columns the numbers may be repeated. The bottom numbers give the sum of the column. Adjazent cells, even diagonally adjazent cells, must be different.

Fill in the grid so that every row, every column and every 3x3 box contain the digits 1 through 9. On each angel the number in the corner is the difference or the sum of the other both numbers.

Fill in the grid so that every row, every column and every 3x3 box contain the digits 1 through 9. On each line one cell is the sum of the others.

Fill in the grid so that every row, every column and 3x3 box contains the digits 1 through 9. Each diagonal has at most three different digits.

Fill in the grid so that every row, every column and the 3x3 boxes 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. All eight blue lines must use the same three digits. Each line must use three different digits.

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. The digit in a oval is either the sum or the product of the digits which are marked with its arrow. The left or top cell in an oval is the tenner, the right or bottom cell is the unit of the sum or product.