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

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

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

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

For row 3, number 9 is only possible in cell (6,3)

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

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

For column 5, Number 3 is only possible in cell (5,9)

For row 3, number 4 is only possible in cell (8,3)

For column 1, Number 4 is only possible in cell (1,7)

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

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

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

Candidates for 8 in boxes 1 and 3 force the candidates in box 2 to be in the remaining line.

Naked Pair for 8 and 9, can remove these as candidates from other cells.

Either candidate for cell (4,1) forces 8 into cell (5,1).

Either candidate for cell (3,2) forces 1 into cell (3,4).

For row 6, number 1 is only possible in cell (5,6)

Either candidate for cell (7,1) forces 5 into cell (4,8).

Naked Pair for 1 and 2, can remove these as candidates from other cells.

X-Wing in rows for 2.

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

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

Either candidate for cell (5,4) forces 1 into cell (6,7).

Either candidate for cell (4,7) forces 3 into cell (8,4).

For row 4, number 9 is only possible in cell (5,4)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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