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

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

Number 5 is the only value possible in cell (4,6).

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

Number 1 is the only value possible in cell (8,6).

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

Number 8 is the only value possible in cell (6,1).

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

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

For row 5, number 1 is only possible in cell (3,5)

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

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

For row 3, number 1 is only possible in cell (9,3)

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

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

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

For row 2, number 5 is only possible in cell (7,2)

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

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

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

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

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

For column 8, Number 6 is only possible in cell (8,1)

For box 3, candidates for 9 are all in row 1, so you can remove candidates from other blocks.

For box 6, candidates for 7 are all in row 5, so you can remove candidates from other blocks.

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

For blocks 1 and 4, candidates for 7 are all in the same two columns (2 and 3)

Hidden Pair for 4 and 8, can remove other candidates from these cells.

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

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

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

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

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

Either candidate for cell (1,3) forces 4 into cell (8,9).

Number 8 is the only value possible in cell (3,9).

Number 4 is the only value possible in cell (3,7).

For row 7, number 8 is only possible in cell (5,7)

Either candidate for cell (3,4) forces 7 into cell (1,7).

For row 9, number 7 is only possible in cell (5,9)

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

For row 5, number 7 is only possible in cell (9,5)

Either candidate for cell (5,3) forces 3 into cell (2,3).

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

Either candidate for cell (3,2) forces 3 into cell (4,9).

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

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

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

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

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

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

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

Number 3 is the only value possible in cell (8,4).

Number 9 is the only value possible in cell (7,5).

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

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

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

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

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

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

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