For row 7, number 1 is only possible in cell (2,7)

For row 5, number 1 is only possible in cell (8,5)

For row 2, number 1 is only possible in cell (7,2)

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

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

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

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

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

For box 9, Number 4 is only possible in cell (8,9)

For box 1, candidates for 7 are all in column 2, so you can remove candidates from other blocks.

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

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

For box 9, candidates for 2 are all in column 7, so you can remove candidates from other blocks.

Candidates for 7 in boxes 5 and 8 force the candidates in box 2 to be in the remaining line.

Naked Pair for 3 and 9, can remove these as candidates from other cells.

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

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

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

Number 8 is the only value possible in cell (2,6).

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

For row 6, number 2 is only possible in cell (1,6)

For row 2, number 4 is only possible in cell (3,2)

For row 2, number 8 is only possible in cell (9,2)

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

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

For row 8, number 4 is only possible in cell (1,8)

For box 1, candidates for 9 are all in column 3, so you can remove candidates from other blocks.

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

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

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

For row 8, number 2 is only possible in cell (4,8)

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

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

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

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

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

Number 8 is the only value possible in cell (3,1).

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Number 3 is the only value possible in cell (6,2).

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

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

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

Number 7 is the only value possible in cell (1,4).

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

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

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

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

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

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