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

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

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

For row 6, number 1 is only possible in cell (4,6)

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

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

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

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

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

For box 1, candidates for 8 are all in row 2, so you can remove candidates from other blocks.

Naked Pair for 2 and 7, can remove these as candidates from other cells.

Naked Pair for 5 and 8, can remove these as candidates from other cells.

Hidden Pair for 2 and 7, can remove other candidates from these cells.

For row 9, number 3 is only possible in cell (6,9)

Naked Pair for 2 and 7, can remove these as candidates from other cells.

Hidden Pair for 2 and 7, can remove other candidates from these cells.

Hidden Pair for 4 and 9, can remove other candidates from these cells.

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

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

Naked Triple for 5, 6 and 8, can remove these as candidates from other cells.

Naked Triple for 3, 5 and 9, can remove these as candidates from other cells.

For column 3, Number 5 is only possible in cell (3,4)

For row 4, number 7 is only possible in cell (1,4)

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

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

Number 7 is the only value possible in cell (2,9).

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

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

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

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

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

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

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

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

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

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

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

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

Number 9 is the only value possible in cell (7,2).

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

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

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

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

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

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

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

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

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

Number 4 is the only value possible in cell (5,7).

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

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

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

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

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

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

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

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

Number 5 is the only value possible in cell (4,1).

Number 8 is the only value possible in cell (5,1).

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

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

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

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

Number 6 is the only value possible in cell (4,9).

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