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

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

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

Number 3 is the only value possible in cell (9,5).

For column 5, Number 1 is only possible in cell (5,7)

For row 7, number 3 is only possible in cell (8,7)

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

For column 7, Number 2 is only possible in cell (7,9)

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

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

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

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

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

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

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

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

For box 6, candidates for 9 are all in column 9, so you can remove candidates from other blocks.

For box 7, candidates for 9 are all in column 1, so you can remove candidates from other blocks.

For box 4, candidates for 5 are all in row 6, so you can remove candidates from other blocks.

For box 7, candidates for 5 are all in column 1, so you can remove candidates from other blocks.

Number 4 is the only value possible in cell (1,6).

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

For row 3, number 4 is only possible in cell (5,3)

For column 5, Number 3 is only possible in cell (5,9)

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

Number 7 is the only value possible in cell (6,8).

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

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

Number 9 is the only value possible in cell (5,4).

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

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

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

Number 9 is the only value possible in cell (6,1).

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

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

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

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

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

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

Number 5 is the only value possible in cell (9,4).

Number 7 is the only value possible in cell (5,6).

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

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

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

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

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

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

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

Number 5 is the only value possible in cell (4,2).

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

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

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

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

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

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

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

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