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

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

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

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

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

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

For column 3, Number 1 is only possible in cell (3,7)

For row 7, number 5 is only possible in cell (1,7)

For column 4, Number 3 is only possible in cell (4,8)

For row 5, number 2 is only possible in cell (4,5)

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

For box 7, candidates for 3 are all in row 9, so you can remove candidates from other blocks.

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

Naked Pair for 5 and 7, can remove these as candidates from other cells.

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

For box 1, candidates for 5 are all in column 2, so you can remove candidates from other blocks.

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

Candidates for 7 in boxes 4 and 5 force the candidates in box 6 to be in the remaining line.

Naked Pair for 6 and 9, can remove these as candidates from other cells.

Naked Pair for 6 and 9, can remove these as candidates from other cells.

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

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

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

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

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

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

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

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

Number 5 is the only value possible in cell (8,2).

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

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

Number 2 is the only value possible in cell (5,8).

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

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

Number 5 is the only value possible in cell (9,4).

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Number 5 is the only value possible in cell (3,6).

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

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

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

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

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

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

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

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

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

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

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