For row 4, number 7 is only possible in cell (9,4)

For column 1, Number 7 is only possible in cell (1,3)

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

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

For row 4, number 2 is only possible in cell (6,4)

For row 8, number 3 is only possible in cell (5,8)

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

For column 3, Number 4 is only possible in cell (3,8)

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

For box 4, Number 1 is only possible in cell (1,6)

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

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

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

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

Hidden Pair for 1 and 7, can remove other candidates from these cells.

For column 6, Number 9 is only possible in cell (6,3)

For box 2, candidates for 5 are all in column 4, so you can remove candidates from other blocks.

For box 2, candidates for 8 are all in column 5, so you can remove candidates from other blocks.

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

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

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

Number 2 is the only value possible in cell (9,5).

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

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

Hidden Pair for 2 and 4, can remove other candidates from these cells.

X-Wing in rows for 4.

Either candidate for cell (2,9) forces 9 into cell (2,2).

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

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

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

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

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

Number 9 is the only value possible in cell (8,1).

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

Number 4 is the only value possible in cell (7,2).

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

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

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

Number 1 is the only value possible in cell (9,3).

Number 6 is the only value possible in cell (1,4).

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

Number 2 is the only value possible in cell (4,7).

Number 6 is the only value possible in cell (2,7).

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

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

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

Number 9 is the only value possible in cell (1,7).

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

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

Number 7 is the only value possible in cell (4,8).

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

Number 7 is the only value possible in cell (6,2).

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

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

Number 3 is the only value possible in cell (1,9).

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

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

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

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