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 in the grid so that every row, every column, and every 3 x 2 box contains the digits 1 through 6. Digits are written in word form (in german). The numbers of letters in dotted boxes must be equal to each other.

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. In the cells you find all allowed candidates for the specific cell.

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. In the cells you find all allowed candidates for the specific cell.

Delete in every cell one number, so that after that that every row, every column, and every 3x3 box contains the digits 1 through 9.

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 7. Digits in black cells must be inserted in the corresponding direction in one of the fields until the next black cell or the border.

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. Outside digits must be inserted in the corresponding row or column of the contiguos box.

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. Outside digits must be inserted in the corresponding row or column of the contiguos box.

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. The letters in the cells are part of the english names of the digits in the cell.

Fill in the grid so that every row, every column, and every 2 x 3 box contains the digits 1 through 6. Each digit appears as in a liquid crystal display, as shown below. Parts of some digits are already placed in the grid.