For row 5, number 1 is only possible in cell (9,5)

For row 2, number 1 is only possible in cell (7,2)

For row 9, number 1 is only possible in cell (6,9)

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

For box 3, Number 2 is only possible in cell (9,3)

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

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

Number 4 is the only value possible in cell (7,6).

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

For row 8, number 4 is only possible in cell (9,8)

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

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

For column 8, Number 8 is only possible in cell (8,7)

For column 8, Number 3 is only possible in cell (8,9)

For box 7, candidates for 2 are all in row 8, so you can remove candidates from other blocks.

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

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

For box 7, candidates for 6 are all in column 2, so you can remove candidates from other blocks.

Naked Pair for 4 and 6, can remove these as candidates from other cells.

Either candidate for cell (3,2) forces 4 into cell (6,3).

Hidden Pair for 4 and 8, can remove other candidates from these cells.

Hidden Pair for 7 and 9, can remove other candidates from these cells.

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

Either candidate for cell (2,3) forces 3 into cell (3,3).

Number 8 is the only value possible in cell (3,2).

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

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

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

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

Number 4 is the only value possible in cell (8,2).

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

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

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

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

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

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

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

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

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

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

For box 2, candidates for 9 are all in column 4, so you can remove candidates from other blocks.

Either candidate for cell (1,5) forces 9 into cell (5,6).

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Number 2 is the only value possible in cell (1,8).

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

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

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

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