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

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

For row 3, number 1 is only possible in cell (7,3)

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

For row 5, number 1 is only possible in cell (6,5)

For column 3, Number 7 is only possible in cell (3,9)

For row 8, number 7 is only possible in cell (9,8)

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

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

For column 3, Number 9 is only possible in cell (3,7)

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

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

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

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

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

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

For box 2, candidates for 2 are all in row 1, so you can remove candidates from other blocks.

Either candidate for cell (2,1) forces 5 into cell (2,9).

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

Either candidate for cell (1,5) forces 7 into cell (2,6).

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

Either candidate for cell (7,1) forces 5 into cell (1,6).

For box 4, candidates for 9 are all in row 5, so you can remove candidates from other blocks.

Hidden Pair for 4 and 5, can remove other candidates from these cells.

Either candidate for cell (8,5) forces 6 into cell (4,9).

Candidates for 4 in boxes 5 and 8 force the candidates in box 2 to be in the remaining line.

Either candidate for cell (7,1) forces 6 into cell (5,6).

Either candidate for cell (9,6) forces 8 into cell (2,1).

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

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

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

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

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

Number 9 is the only value possible in cell (1,2).

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

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

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

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

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

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

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

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

Number 7 is the only value possible in cell (6,2).

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Number 4 is the only value possible in cell (6,9).