Number 6 is the only value possible in cell (9,8).

Number 5 is the only value possible in cell (3,8).

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

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

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

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

For row 7, number 1 is only possible in cell (2,7)

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

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

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

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

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

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

For box 3, candidates for 6 are all in column 7, so you can remove candidates from other blocks.

For blocks 2 and 8, candidates for 3 are all in the same two columns (4 and 6)

Hidden Pair for 4 and 6, can remove other candidates from these cells.

Naked Triple for 2, 7 and 9, can remove these as candidates from other cells.

For column 6, Number 9 is only possible in cell (6,3)

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

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

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

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

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

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

Number 6 is the only value possible in cell (5,1).

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

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

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

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

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

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

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

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

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

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

Number 6 is the only value possible in cell (4,7).

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

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

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

Number 3 is the only value possible in cell (5,4).

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

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

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

Number 6 is the only value possible in cell (2,4).

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

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

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

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

Number 5 is the only value possible in cell (1,6).

Number 4 is the only value possible in cell (2,6).

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

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

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

Number 9 is the only value possible in cell (8,6).

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

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

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

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

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

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

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