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

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

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

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

For row 6, number 7 is only possible in cell (1,6)

For row 2, number 6 is only possible in cell (7,2)

For box 2, Number 5 is only possible in cell (5,1)

For column 8, Number 3 is only possible in cell (8,5)

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

For column 1, Number 4 is only possible in cell (1,3)

For row 3, number 2 is only possible in cell (9,3)

For row 4, number 2 is only possible in cell (5,4)

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

Number 1 is the only value possible in cell (7,8).

For box 3, Number 1 is only possible in cell (8,3)

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

For column 7, Number 8 is only possible in cell (7,5)

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

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

For row 4, number 1 is only possible in cell (9,4)

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

For row 9, number 4 is only possible in cell (6,9)

For box 1, candidates for 3 are all in column 2, so you can remove candidates from other blocks.

For blocks 5 and 6, candidates for 9 are all in the same two rows (4 and 6)

Either candidate for cell (1,4) forces 1 into cell (5,7).

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

Number 3 is the only value possible in cell (5,6).

Either candidate for cell (8,8) forces 1 into cell (3,9).

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Number 8 is the only value possible in cell (1,7).

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

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

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

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

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

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