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

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

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

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

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

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

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

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

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

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

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

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

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

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

For column 1, Number 8 is only possible in cell (1,9)

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

For column 9, Number 8 is only possible in cell (9,1)

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

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

Candidates for 7 in boxes 1 and 2 force the candidates in box 3 to be in the remaining line.

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

For row 1, number 5 is only possible in cell (4,1)

For box 2, Number 3 is only possible in cell (4,2)

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

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

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

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

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

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

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

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

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

Number 3 is the only value possible in cell (9,8).

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

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

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

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

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

Number 7 is the only value possible in cell (3,1).

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

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

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

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

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

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

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

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

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

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

Number 3 is the only value possible in cell (5,9).

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

Number 5 is the only value possible in cell (7,9).

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

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