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

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

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

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

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

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

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

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

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

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

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

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

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

For row 7, number 8 is only possible in cell (1,7)

For row 9, number 5 is only possible in cell (2,9)

For column 2, Number 1 is only possible in cell (2,6)

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

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

For row 5, number 9 is only possible in cell (2,5)

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

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

For box 3, candidates for 2 are all in column 7, so you can remove candidates from other blocks.

For box 7, candidates for 4 are all in column 3, so you can remove candidates from other blocks.

Naked Pair for 3 and 7, can remove these as candidates from other cells.

Hidden Pair for 1 and 2, can remove other candidates from these cells.

For row 1, number 5 is only possible in cell (8,1)

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

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

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

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

Number 6 is the only value possible in cell (3,4).

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Number 3 is the only value possible in cell (2,8).

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

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

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

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

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

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

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

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