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

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

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

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

For column 9, Number 1 is only possible in cell (9,2)

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

For column 5, Number 7 is only possible in cell (5,7)

For box 9, candidates for 3 are all in column 7, so you can remove candidates from other blocks.

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

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

For blocks 7 and 8, candidates for 9 are all in the same two rows (8 and 9)

For blocks 1 and 2, candidates for 6 are all in the same two rows (1 and 2)

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

Hidden Pair for 1 and 7, can remove other candidates from these cells.

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

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

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

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

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

Number 4 is the only value possible in cell (7,8).

For column 7, Number 9 is only possible in cell (7,5)

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

For row 5, number 2 is only possible in cell (1,5)

For row 9, number 4 is only possible in cell (2,9)

For row 1, number 6 is only possible in cell (4,1)

Number 3 is the only value possible in cell (4,2).

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

Number 7 is the only value possible in cell (9,1).

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

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

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

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

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

Number 6 is the only value possible in cell (7,3).

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

Number 3 is the only value possible in cell (6,4).

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

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

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

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

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

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

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

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

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

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

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

Number 9 is the only value possible in cell (4,6).

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

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

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

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

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

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

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

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

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

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