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

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

For column 3, Number 7 is only possible in cell (3,4)

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

For row 2, number 4 is only possible in cell (1,2)

For row 5, number 4 is only possible in cell (9,5)

For column 2, Number 4 is only possible in cell (2,7)

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

For row 4, number 3 is only possible in cell (8,4)

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

For row 7, number 3 is only possible in cell (9,7)

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

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

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

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

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

For row 8, number 3 is only possible in cell (6,8)

For row 8, number 4 is only possible in cell (5,8)

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

For column 7, Number 6 is only possible in cell (7,5)

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

For row 6, number 1 is only possible in cell (5,6)

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

For blocks 5 and 8, candidates for 8 are all in the same two columns (5 and 4)

For blocks 5 and 8, candidates for 2 are all in the same two columns (5 and 4)

Hidden Pair for 6 and 7, can remove other candidates from these cells.

For row 3, number 8 is only possible in cell (6,3)

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

Number 5 is the only value possible in cell (7,2).

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Number 6 is the only value possible in cell (8,3).

Number 7 is the only value possible in cell (9,3).

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

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

Number 2 is the only value possible in cell (4,7).

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

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

Number 5 is the only value possible in cell (1,7).

Number 9 is the only value possible in cell (1,8).

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

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