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

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

Number 6 is the only value possible in cell (4,5).

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

For box 2, Number 9 is only possible in cell (5,2)

For column 9, Number 9 is only possible in cell (9,6)

For row 3, number 6 is only possible in cell (9,3)

For column 4, Number 2 is only possible in cell (4,3)

Number 4 is the only value possible in cell (7,3).

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

For box 2, candidates for 8 are all in column 6, so you can remove candidates from other blocks.

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

For row 6, number 8 is only possible in cell (4,6)

For box 2, candidates for 4 are all in column 6, so you can remove candidates from other blocks.

Candidates for 4 in boxes 1 and 7 force the candidates in box 4 to be in the remaining line.

Either candidate for cell (1,7) forces 7 into cell (9,7).

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

For row 8, number 6 is only possible in cell (1,8)

For row 4, number 6 is only possible in cell (8,4)

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

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

For box 4, candidates for 3 are all in column 2, so you can remove candidates from other blocks.

Either candidate for cell (6,7) forces 2 into cell (1,7).

For box 4, candidates for 2 are all in column 2, so you can remove candidates from other blocks.

Candidates for 1 in boxes 1 and 7 force the candidates in box 4 to be in the remaining line.

Either candidate for cell (2,8) forces 1 into cell (6,7).

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

Number 4 is the only value possible in cell (3,9).

Number 5 is the only value possible in cell (2,9).

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

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

Number 8 is the only value possible in cell (6,1).

Number 4 is the only value possible in cell (6,2).

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

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

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

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

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

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

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

Number 4 is the only value possible in cell (5,6).

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

Number 2 is the only value possible in cell (7,1).

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

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

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

Number 8 is the only value possible in cell (9,2).

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

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

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

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

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

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

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

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

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

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

Number 2 is the only value possible in cell (8,9).