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

For row 9, number 2 is only possible in cell (7,9)

For row 1, number 5 is only possible in cell (3,1)

For column 9, Number 2 is only possible in cell (9,1)

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

For row 7, number 6 is only possible in cell (9,7)

For column 2, Number 6 is only possible in cell (2,9)

For column 8, Number 6 is only possible in cell (8,4)

For column 8, Number 8 is only possible in cell (8,5)

For box 9, candidates for 7 are all in column 8, so you can remove candidates from other blocks.

For box 7, candidates for 3 are all in column 3, so you can remove candidates from other blocks.

Naked Pair for 1 and 7, can remove these as candidates from other cells.

For box 8, candidates for 7 are all in column 5, so you can remove candidates from other blocks.

Candidates for 1 in boxes 5 and 8 force the candidates in box 2 to be in the remaining line.

Hidden Pair for 1 and 8, can remove other candidates from these cells.

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

For row 8, number 6 is only possible in cell (5,8)

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

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

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

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

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

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

Number 5 is the only value possible in cell (7,4).

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

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

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

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

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

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

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

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

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

Number 9 is the only value possible in cell (1,3).

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

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

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

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

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

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

Number 9 is the only value possible in cell (6,2).

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

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

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

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

Number 4 is the only value possible in cell (7,5).

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

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

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

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

Number 1 is the only value possible in cell (5,6).

Number 9 is the only value possible in cell (7,6).

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

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

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

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

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

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

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