Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. The relation signs mark the relations between the sums of the digits of the sub-regions.

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. The relation signs mark the relations between the sums of the digits of the sub-regions.

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.