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

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

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

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

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

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

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

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

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

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

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

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

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

For column 7, Number 8 is only possible in cell (7,4)

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

For column 8, Number 5 is only possible in cell (8,8)

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

For row 7, number 4 is only possible in cell (3,7)

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

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

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

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

For row 8, number 6 is only possible in cell (9,8)

For column 3, Number 6 is only possible in cell (3,1)

For row 6, number 4 is only possible in cell (2,6)

For row 6, number 9 is only possible in cell (7,6)

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

For row 2, number 4 is only possible in cell (1,2)

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

Naked Pair for 2 and 5, can remove these as candidates from other cells.

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

Number 3 is the only value possible in cell (7,5).

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

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

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

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

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

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

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

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

Number 5 is the only value possible in cell (6,3).

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

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

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

Number 1 is the only value possible in cell (9,2).

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

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

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

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

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

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

Number 7 is the only value possible in cell (9,6).

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

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

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

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