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

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

For box 2, candidates for 4 are all in column 5, so you can remove candidates from other blocks.

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

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

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

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

For box 3, candidates for 5 are all in row 2, so you can remove candidates from other blocks.

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

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

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

Naked Pair for 1 and 4, can remove these as candidates from other cells.

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

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

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

For row 3, number 6 is only possible in cell (9,3)

For row 5, number 6 is only possible in cell (2,5)

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

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

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

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

For row 7, number 6 is only possible in cell (3,7)

For column 5, Number 9 is only possible in cell (5,4)

For row 5, number 9 is only possible in cell (8,5)

For row 5, number 7 is only possible in cell (6,5)

For row 5, number 3 is only possible in cell (9,5)

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

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

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

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

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

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

Number 1 is the only value possible in cell (7,3).

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

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

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

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

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

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

Number 8 is the only value possible in cell (1,7).

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

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

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

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

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

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

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

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

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

Number 7 is the only value possible in cell (2,6).

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

Number 7 is the only value possible in cell (3,1).

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

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

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

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

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

Number 2 is the only value possible in cell (4,8).

Number 9 is the only value possible in cell (6,8).

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

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

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