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

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

For column 4, Number 7 is only possible in cell (4,6)

For column 8, Number 2 is only possible in cell (8,6)

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

For column 4, Number 6 is only possible in cell (4,7)

For box 8, candidates for 4 are all in column 6, so you can remove candidates from other blocks.

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

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

Naked Pair for 6 and 8, can remove these as candidates from other cells.

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

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

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

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

Number 6 is the only value possible in cell (5,4).

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

For row 2, number 5 is only possible in cell (3,2)

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

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

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

For row 3, number 8 is only possible in cell (8,3)

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

Number 4 is the only value possible in cell (8,9).

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

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

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

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

For row 4, number 7 is only possible in cell (9,4)

For column 1, Number 8 is only possible in cell (1,9)

For column 2, Number 8 is only possible in cell (2,5)

For row 8, number 1 is only possible in cell (3,8)

For row 4, number 1 is only possible in cell (2,4)

For column 1, Number 6 is only possible in cell (1,3)

For column 3, Number 6 is only possible in cell (3,5)

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

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

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

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

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

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

Number 8 is the only value possible in cell (7,6).

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Number 3 is the only value possible in cell (5,9).

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