For row 1, number 4 is only possible in cell (7,1)

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

For row 3, number 4 is only possible in cell (5,3)

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

For row 7, number 4 is only possible in cell (2,7)

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

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

For box 6, candidates for 1 are all in column 9, so you can remove candidates from other blocks.

For box 6, candidates for 5 are all in column 9, so you can remove candidates from other blocks.

Naked Pair for 7 and 8, can remove these as candidates from other cells.

For column 1, Number 7 is only possible in cell (1,2)

For column 2, Number 7 is only possible in cell (2,9)

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

Number 8 is the only value possible in cell (7,5).

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

Number 3 is the only value possible in cell (8,4).

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

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

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

Number 7 is the only value possible in cell (5,8).

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

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

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

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

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

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

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

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

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

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

Number 5 is the only value possible in cell (8,1).

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

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

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

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

Number 1 is the only value possible in cell (4,3).

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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