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

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

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

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

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

For row 4, number 7 is only possible in cell (8,4)

For column 1, Number 2 is only possible in cell (1,8)

For row 9, number 2 is only possible in cell (6,9)

For row 9, number 7 is only possible in cell (4,9)

For column 1, Number 9 is only possible in cell (1,5)

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

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

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

Number 4 is the only value possible in cell (3,9).

For row 1, number 4 is only possible in cell (8,1)

For row 3, number 4 is only possible in cell (2,3)

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

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

For row 7, number 4 is only possible in cell (9,7)

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

For row 8, number 4 is only possible in cell (6,8)

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

For column 3, Number 5 is only possible in cell (3,4)

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

For row 5, number 6 is only possible in cell (9,5)

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

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

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

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

For box 7, candidates for 1 are all in column 3, so you can remove candidates from other blocks.

For box 8, candidates for 1 are all in column 4, so you can remove candidates from other blocks.

For row 2, number 1 is only possible in cell (8,2)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Number 9 is the only value possible in cell (7,2).

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

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

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

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

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

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

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

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