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

For row 4, number 9 is only possible in cell (8,4)

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

For row 2, number 8 is only possible in cell (6,2)

For row 4, number 8 is only possible in cell (1,4)

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

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

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

For row 8, number 6 is only possible in cell (5,8)

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

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

For box 9, Number 5 is only possible in cell (8,8)

For row 7, number 2 is only possible in cell (5,7)

For box 6, candidates for 1 are all in row 5, so you can remove candidates from other blocks.

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

Candidates for 4 in boxes 1 and 3 force the candidates in box 2 to be in the remaining line.

Naked Pair for 1 and 3, can remove these as candidates from other cells.

For box 4, candidates for 3 are all in row 5, so you can remove candidates from other blocks.

Naked Pair for 4 and 5, can remove these as candidates from other cells.

Naked Pair for 1 and 3, can remove these as candidates from other cells.

For row 5, number 1 is only possible in cell (7,5)

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

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

Number 4 is the only value possible in cell (9,1).

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

For row 1, number 9 is only possible in cell (4,1)

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

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

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

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

For column 4, Number 3 is only possible in cell (4,6)

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

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

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

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

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

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

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

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

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

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

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

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

Number 4 is the only value possible in cell (6,5).

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

Number 7 is the only value possible in cell (1,5).

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

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

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

Number 2 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 (3,6).

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

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

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

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

Number 4 is the only value possible in cell (1,9).

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

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

Number 1 is the only value possible in cell (4,9).

Number 5 is the only value possible in cell (6,9).