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

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

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

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

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

Number 1 is the only value possible in cell (8,4).

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

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

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

For row 8, number 4 is only possible in cell (9,8)

For row 5, number 4 is only possible in cell (8,5)

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

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

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

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

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

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

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

For box 7, candidates for 6 are all in row 9, so you can remove candidates from other blocks.

For box 6, candidates for 8 are all in row 5, so you can remove candidates from other blocks.

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

Naked Pair for 2 and 7, can remove these as candidates from other cells.

Naked Pair for 5 and 8, can remove these as candidates from other cells.

For box 8, candidates for 5 are all in row 9, so you can remove candidates from other blocks.

Naked Pair for 5 and 8, can remove these as candidates from other cells.

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

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

Number 3 is the only value possible in cell (7,8).

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

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

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

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

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

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

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

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

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

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

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

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

Number 2 is the only value possible in cell (7,5).

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

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

Number 9 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 (2,1).

Number 2 is the only value possible in cell (3,1).

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

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

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

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

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

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

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

Number 7 is the only value possible in cell (2,5).

Number 8 is the only value possible in cell (3,7).

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

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

Number 5 is the only value possible in cell (2,7).

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

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

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

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

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

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

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

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