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

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

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

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

Number 3 is the only value possible in cell (5,8).

For row 1, number 9 is only possible in cell (3,1)

For row 5, number 9 is only possible in cell (8,5)

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

For row 5, number 2 is only possible in cell (9,5)

For row 7, number 2 is only possible in cell (8,7)

For row 7, number 3 is only possible in cell (7,7)

For row 8, number 4 is only possible in cell (3,8)

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

For row 9, number 2 is only possible in cell (3,9)

For column 7, Number 4 is only possible in cell (7,2)

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

For box 3, candidates for 8 are all in row 1, so you can remove candidates from other blocks.

For box 3, candidates for 5 are all in row 1, so you can remove candidates from other blocks.

Number 6 is the only value possible in cell (2,1).

For box 7, candidates for 5 are all in row 7, so you can remove candidates from other blocks.

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

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

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

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

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

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

Number 8 is the only value possible in cell (3,4).

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

Number 5 is the only value possible in cell (8,4).

Number 1 is the only value possible in cell (7,4).

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

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

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

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

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

Number 1 is the only value possible in cell (2,6).

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

Number 8 is the only value possible in cell (9,6).

Number 5 is the only value possible in cell (9,1).

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

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

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

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

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

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

Number 6 is the only value possible in cell (9,7).

Number 7 is the only value possible in cell (9,3).

Number 6 is the only value possible in cell (8,3).

Number 5 is the only value possible in cell (7,8).

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

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

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

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

Number 7 is the only value possible in cell (8,9).