For row 3, number 9 is only possible in cell (5,3)

For row 9, number 8 is only possible in cell (1,9)

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

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

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

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

Number 2 is the only value possible in cell (5,8).

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

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

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

For column 5, Number 8 is only possible in cell (5,2)

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

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

For row 1, number 3 is only possible in cell (9,1)

For row 1, number 2 is only possible in cell (3,1)

For row 2, number 1 is only possible in cell (3,2)

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

For row 6, number 8 is only possible in cell (3,6)

For row 3, number 8 is only possible in cell (2,3)

For row 7, number 4 is only possible in cell (5,7)

For box 3, candidates for 6 are all in column 9, so you can remove candidates from other blocks.

For box 3, candidates for 5 are all in column 9, so you can remove candidates from other blocks.

Naked Pair for 5 and 7, can remove these as candidates from other cells.

Candidates for 5 in boxes 2 and 8 force the candidates in box 5 to be in the remaining line.

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

For row 1, number 4 is only possible in cell (6,1)

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

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

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

Number 5 is the only value possible in cell (2,1).

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

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

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

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

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

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

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

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

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

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

Number 5 is the only value possible in cell (8,4).

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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