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

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

For row 5, number 7 is only possible in cell (8,5)

For row 6, number 7 is only possible in cell (1,6)

For box 8, Number 7 is only possible in cell (5,7)

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

For row 8, number 2 is only possible in cell (1,8)

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

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

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

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

For box 7, candidates for 4 are all in row 9, so you can remove candidates from other blocks.

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

For box 6, candidates for 6 are all in row 4, so you can remove candidates from other blocks.

For box 8, candidates for 6 are all in row 8, so you can remove candidates from other blocks.

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

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

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

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

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

Candidates for 2 in boxes 4 and 6 force the candidates in box 5 to be in the remaining line.

Naked Pair for 3 and 4, can remove these as candidates from other cells.

Naked Pair for 3 and 6, can remove these as candidates from other cells.

Either candidate for cell (8,3) forces 7 into cell (9,1).

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

Number 6 is the only value possible in cell (7,3).

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

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

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

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

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

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

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

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

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

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

Number 6 is the only value possible in cell (3,7).

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

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

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

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

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

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

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

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

Number 7 is the only value possible in cell (6,3).

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

Number 4 is the only value possible in cell (5,2).

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

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

Number 2 is the only value possible in cell (4,5).

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

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

Number 3 is the only value possible in cell (4,8).

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

Number 4 is the only value possible in cell (6,8).

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

Number 3 is the only value possible in cell (2,9).

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

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

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