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

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

Number 5 is the only value possible in cell (6,7).

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

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

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

For column 7, Number 9 is only possible in cell (7,7)

For column 4, Number 7 is only possible in cell (4,1)

For column 4, Number 6 is only possible in cell (4,5)

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

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

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

Number 1 is the only value possible in cell (4,3).

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

Number 1 is the only value possible in cell (9,5).

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

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

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

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

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

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

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

For blocks 4 and 7, candidates for 8 are all in the same two columns (1 and 3)

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

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

Naked Pair for 6 and 7, can remove these as candidates from other cells.

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

For column 8, Number 6 is only possible in cell (8,2)

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

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

Number 6 is the only value possible in cell (5,7).

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

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

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

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

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

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

Number 2 is the only value possible in cell (5,3).

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

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

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

Number 2 is the only value possible in cell (8,1).

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

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

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

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

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

Number 3 is the only value possible in cell (1,6).

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

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

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

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

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

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

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

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

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

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

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