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

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

For box 9, Number 6 is only possible in cell (8,9)

For box 1, candidates for 4 are all in column 2, so you can remove candidates from other blocks.

For box 1, candidates for 5 are all in column 2, so you can remove candidates from other blocks.

For box 1, candidates for 8 are all in column 1, so you can remove candidates from other blocks.

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

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

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

For row 8, number 6 is only possible in cell (2,8)

For box 7, candidates for 2 are all in column 3, so you can remove candidates from other blocks.

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

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

For column 1, Number 3 is only possible in cell (1,8)

For column 4, Number 3 is only possible in cell (4,7)

Naked Pair for 8 and 9, can remove these as candidates from other cells.

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

For box 8, candidates for 9 are all in column 4, so you can remove candidates from other blocks.

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

Number 2 is the only value possible in cell (5,4).

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

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

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

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

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

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

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

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

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

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

Number 1 is the only value possible in cell (2,7).

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

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

Number 1 is the only value possible in cell (7,5).

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

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

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

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

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

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

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

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

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

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

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

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

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

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

For row 3, number 9 is only possible in cell (7,3)

For row 2, number 5 is only possible in cell (8,2)

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

Number 5 is the only value possible in cell (2,3).

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

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

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

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

Number 4 is the only value possible in cell (6,2).

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

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

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

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

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