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

For column 6, Number 3 is only possible in cell (6,8)

For column 4, Number 9 is only possible in cell (4,6)

For column 6, Number 7 is only possible in cell (6,4)

For row 3, number 1 is only possible in cell (6,3)

For column 6, Number 9 is only possible in cell (6,1)

For column 5, Number 6 is only possible in cell (5,9)

For column 4, Number 1 is only possible in cell (4,5)

For column 8, Number 1 is only possible in cell (8,4)

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

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

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

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

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

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

For row 1, number 5 is only possible in cell (9,1)

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

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

For column 7, Number 8 is only possible in cell (7,6)

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

Naked Pair for 2 and 4, can remove these as candidates from other cells.

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

Hidden Pair for 1 and 6, can remove other candidates from these cells.

For row 7, number 3 is only possible in cell (1,7)

Number 7 is the only value possible in cell (1,6).

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

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

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

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

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

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

Number 4 is the only value possible in cell (9,7).

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

Number 4 is the only value possible in cell (8,5).

Number 8 is the only value possible in cell (2,5).

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

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

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

Number 2 is the only value possible in cell (5,1).

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

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

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

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

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

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

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

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

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

Number 8 is the only value possible in cell (5,4).

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

Number 7 is the only value possible in cell (2,8).

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

Number 2 is the only value possible in cell (7,8).

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

Number 2 is the only value possible in cell (1,4).

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

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

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

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