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

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

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

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

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

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

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

For column 7, Number 3 is only possible in cell (7,9)

For row 2, number 4 is only possible in cell (8,2)

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

For box 7, candidates for 7 are all in column 2, so you can remove candidates from other blocks.

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

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

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

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

For row 8, number 7 is only possible in cell (2,8)

Naked Pair for 1 and 2, can remove these as candidates from other cells.

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

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

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

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

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

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

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

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

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

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

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

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

Number 3 is the only value possible in cell (5,1).

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

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

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

Number 4 is the only value possible in cell (1,9).

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

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

Number 5 is the only value possible in cell (3,1).

Number 9 is the only value possible in cell (6,1).

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

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

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

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

Number 9 is the only value possible in cell (8,3).

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

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

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

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

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

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

Number 1 is the only value possible in cell (9,6).

Number 2 is the only value possible in cell (9,1).

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

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

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

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

Number 1 is the only value possible in cell (5,9).

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