Number 7 is the only value possible in cell (1,6).

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

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

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

For row 3, number 1 is only possible in cell (4,3)

For row 6, number 1 is only possible in cell (3,6)

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

For column 2, Number 3 is only possible in cell (2,8)

For column 4, Number 3 is only possible in cell (4,5)

For row 6, number 3 is only possible in cell (7,6)

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

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

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

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

For box 4, candidates for 9 are all in column 3, so you can remove candidates from other blocks.

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

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

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

For blocks 2 and 5, candidates for 4 are all in the same two columns (4 and 5)

Candidates for 9 in boxes 4 and 6 force the candidates in box 5 to be in the remaining line.

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

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

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

Number 7 is the only value possible in cell (8,2).

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

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

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

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

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

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

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

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

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

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

Number 6 is the only value possible in cell (3,4).

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

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

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

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

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

Number 4 is the only value possible in cell (7,9).

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

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

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

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

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

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

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

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

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

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

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

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

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

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