For row 1, number 9 is only possible in cell (7,1)

For row 6, number 9 is only possible in cell (4,6)

For row 4, number 9 is only possible in cell (3,4)

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

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

For column 9, Number 7 is only possible in cell (9,6)

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

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

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

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

For box 9, candidates for 5 are all in row 7, so you can remove candidates from other blocks.

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

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

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

Number 3 is the only value possible in cell (7,6).

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

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

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

For row 5, number 7 is only possible in cell (2,5)

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

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

For blocks 1 and 4, candidates for 6 are all in the same two columns (1 and 2)

Naked Pair for 3 and 8, can remove these as candidates from other cells.

Naked Pair for 3 and 4, can remove these as candidates from other cells.

Candidates for 4 in boxes 1 and 2 force the candidates in box 3 to be in the remaining line.

Either candidate for cell (9,1) forces 3 into cell (8,3).

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

Either candidate for cell (4,2) forces 3 into cell (2,2).

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

For row 8, number 4 is only possible in cell (7,8)

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

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

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

Number 6 is the only value possible in cell (1,3).

Number 5 is the only value possible in cell (2,3).

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Number 3 is the only value possible in cell (4,5).

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

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

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

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

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

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

Number 8 is the only value possible in cell (5,9).

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

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