For box 2, Number 6 is only possible in cell (4,1)

For column 5, Number 8 is only possible in cell (5,4)

For row 6, number 7 is only possible in cell (4,6)

For column 4, Number 9 is only possible in cell (4,5)

For row 1, number 5 is only possible in cell (7,1)

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

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

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

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

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

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

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

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

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

For row 8, number 7 is only possible in cell (2,8)

For row 3, number 8 is only possible in cell (9,3)

For row 7, number 4 is only possible in cell (3,7)

For column 7, Number 4 is only possible in cell (7,9)

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

For box 5, candidates for 2 are all in column 6, so you can remove candidates from other blocks.

For box 2, candidates for 1 are all in column 6, so you can remove candidates from other blocks.

Number 3 is the only value possible in cell (6,9).

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

Number 1 is the only value possible in cell (4,7).

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

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

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

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

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

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

Number 6 is the only value possible in cell (1,4).

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

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

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

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

Number 4 is the only value possible in cell (9,5).

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

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

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

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

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

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

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

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

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

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

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

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

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

Number 9 is the only value possible in cell (6,3).

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

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

Number 3 is the only value possible in cell (9,6).

Number 9 is the only value possible in cell (7,6).

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

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