Number 6 is the only value possible in cell (4,4).

Number 1 is the only value possible in cell (4,3).

Number 7 is the only value possible in cell (4,5).

Number 4 is the only value possible in cell (6,7).

For row 1, number 1 is only possible in cell (1,1)

For row 5, number 1 is only possible in cell (2,5)

For row 9, number 1 is only possible in cell (5,9)

For row 7, number 1 is only possible in cell (8,7)

For column 5, Number 8 is only possible in cell (5,5)

For row 9, number 4 is only possible in cell (7,9)

For column 8, Number 4 is only possible in cell (8,5)

Number 2 is the only value possible in cell (1,5).

Number 3 is the only value possible in cell (6,5).

Number 6 is the only value possible in cell (9,5).

Number 2 is the only value possible in cell (6,6).

For row 3, number 6 is only possible in cell (5,3)

For row 6, number 6 is only possible in cell (3,6)

For row 8, number 6 is only possible in cell (7,8)

For row 6, number 4 is only possible in cell (1,6)

For row 3, number 4 is only possible in cell (3,3)

For row 8, number 7 is only possible in cell (5,8)

Number 9 is the only value possible in cell (5,7).

For column 7, Number 7 is only possible in cell (7,7)

For box 1, candidates for 9 are all in row 2, so you can remove candidates from other blocks.

For box 9, candidates for 8 are all in column 9, so you can remove candidates from other blocks.

For box 3, candidates for 8 are all in row 3, so you can remove candidates from other blocks.

Number 5 is the only value possible in cell (1,3).

Number 9 is the only value possible in cell (1,8).

Number 8 is the only value possible in cell (1,2).

For row 2, number 9 is only possible in cell (2,2)

For row 9, number 9 is only possible in cell (9,9)

For column 9, Number 8 is only possible in cell (9,7)

Number 2 is the only value possible in cell (2,7).

Number 3 is the only value possible in cell (2,3).

Number 2 is the only value possible in cell (3,1).

Number 3 is the only value possible in cell (5,1).

Number 9 is the only value possible in cell (7,1).

Number 5 is the only value possible in cell (8,1).

Number 7 is the only value possible in cell (3,2).

Number 2 is the only value possible in cell (5,2).

Number 3 is the only value possible in cell (9,2).

Number 8 is the only value possible in cell (8,3).

Number 2 is the only value possible in cell (7,3).

Number 2 is the only value possible in cell (9,4).

Number 8 is the only value possible in cell (2,6).

Number 3 is the only value possible in cell (3,4).

Number 8 is the only value possible in cell (7,4).

Number 9 is the only value possible in cell (8,4).

Number 3 is the only value possible in cell (7,6).

Number 5 is the only value possible in cell (3,7).

Number 3 is the only value possible in cell (8,8).

Number 5 is the only value possible in cell (9,8).

Number 7 is the only value possible in cell (2,9).

Number 8 is the only value possible in cell (3,9).