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

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

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

For row 5, number 9 is only possible in cell (7,5)

For row 8, number 1 is only possible in cell (6,8)

For box 9, Number 7 is only possible in cell (8,7)

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

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

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

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

For row 6, number 3 is only possible in cell (2,6)

For row 5, number 3 is only possible in cell (4,5)

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

For row 6, number 4 is only possible in cell (5,6)

For box 5, candidates for 1 are all in row 4, so you can remove candidates from other blocks.

Candidates for 5 in boxes 1 and 3 force the candidates in box 2 to be in the remaining line.

Hidden Pair for 4 and 6, can remove other candidates from these cells.

Either candidate for cell (7,4) forces 1 into cell (4,4).

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

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

Number 1 is the only value possible in cell (5,3).

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

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

For row 3, number 9 is only possible in cell (2,3)

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

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

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

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

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

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

Either candidate for cell (9,6) forces 8 into cell (5,4).

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

Number 8 is the only value possible in cell (6,1).

For row 5, number 8 is only possible in cell (1,5)

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

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

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

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

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

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

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

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

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

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

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

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

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

Number 5 is the only value possible in cell (8,3).

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

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

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

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

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