Number 7 is the only value possible in cell (3,1).

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

For row 6, number 8 is only possible in cell (9,6)

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

For row 6, number 7 is only possible in cell (4,6)

For row 5, number 7 is only possible in cell (1,5)

For column 1, Number 9 is only possible in cell (1,7)

For row 8, number 9 is only possible in cell (8,8)

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

Number 9 is the only value possible in cell (3,6).

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

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

For row 2, number 8 is only possible in cell (6,2)

For row 1, number 8 is only possible in cell (2,1)

For row 2, number 7 is only possible in cell (5,2)

For row 9, number 7 is only possible in cell (6,9)

For column 7, Number 6 is only possible in cell (7,7)

For column 2, Number 5 is only possible in cell (2,3)

For column 9, Number 5 is only possible in cell (9,9)

For row 7, number 4 is only possible in cell (5,7)

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

For column 2, Number 4 is only possible in cell (2,5)

For box 3, Number 1 is only possible in cell (9,3)

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

For box 3, candidates for 5 are all in row 2, so you can remove candidates from other blocks.

For box 7, candidates for 3 are all in row 8, so you can remove candidates from other blocks.

Number 2 is the only value possible in cell (5,8).

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

Number 6 is the only value possible in cell (1,3).

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

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

Number 2 is the only value possible in cell (4,3).

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

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

Number 1 is the only value possible in cell (2,4).

Number 2 is the only value possible in cell (7,4).

Number 5 is the only value possible in cell (7,2).

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

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

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

Number 3 is the only value possible in cell (4,5).

Number 2 is the only value possible in cell (6,5).

Number 1 is the only value possible in cell (7,5).

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

Number 3 is the only value possible in cell (2,8).

Number 1 is the only value possible in cell (3,8).

Number 5 is the only value possible in cell (6,8).

Number 1 is the only value possible in cell (6,1).

Number 5 is the only value possible in cell (4,1).

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

Number 1 is the only value possible in cell (8,7).

Number 6 is the only value possible in cell (4,8).

Number 1 is the only value possible in cell (4,9).

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