Number 5 is the only value possible in cell (8,6).

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

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

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

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

For column 1, Number 7 is only possible in cell (1,4)

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

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

For row 2, number 2 is only possible in cell (3,2)

For column 7, Number 6 is only possible in cell (7,3)

For row 3, number 7 is only possible in cell (5,3)

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

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

For row 1, number 7 is only possible in cell (9,1)

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

For row 9, number 2 is only possible in cell (7,9)

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

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

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

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

For row 2, number 3 is only possible in cell (6,2)

For row 8, number 5 is only possible in cell (9,8)

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

For box 2, candidates for 9 are all in row 1, so you can remove candidates from other blocks.

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

For box 8, candidates for 4 are all in row 7, so you can remove candidates from other blocks.

For blocks 1 and 4, candidates for 9 are all in the same two columns (1 and 3)

Either candidate for cell (2,1) forces 4 into cell (1,8).

Number 9 is the only value possible in cell (1,3).

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

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

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

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

Either candidate for cell (5,1) forces 6 into cell (3,8).

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

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

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

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

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

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

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

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

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

Number 9 is the only value possible in cell (8,2).

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

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

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

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

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

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

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

Number 9 is the only value possible in cell (2,8).

Number 1 is the only value possible in cell (4,8).

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

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

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

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