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

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

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

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

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

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

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

For column 4, Number 1 is only possible in cell (4,2)

Number 9 is the only value possible in cell (5,3).

For row 1, number 7 is only possible in cell (9,1)

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

For box 3, candidates for 9 are all in row 2, so you can remove candidates from other blocks.

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

For box 9, candidates for 3 are all in column 8, so you can remove candidates from other blocks.

Naked Pair for 3 and 8, can remove these as candidates from other cells.

Hidden Pair for 1 and 4, can remove other candidates from these cells.

For box 6, candidates for 3 are all in row 6, so you can remove candidates from other blocks.

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

Naked Triple for 3, 6 and 9, can remove these as candidates from other cells.

Either candidate for cell (9,9) forces 8 into cell (2,9).

For box 1, Number 8 is only possible in cell (3,2)

For box 1, candidates for 2 are all in column 2, so you can remove candidates from other blocks.

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

For row 6, number 7 is only possible in cell (3,6)

Number 2 is the only value possible in cell (3,7).

Number 3 is the only value possible in cell (8,7).

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

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

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

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

For row 6, number 2 is only possible in cell (1,6)

For column 1, Number 8 is only possible in cell (1,5)

Naked Pair for 5 and 6, can remove these as candidates from other cells.

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

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

Naked Triple for 1, 3 and 8, can remove these as candidates from other cells.

X-Wing in rows for 6.

Either candidate for cell (2,2) forces 3 into cell (6,5).

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

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

Number 3 is the only value possible in cell (4,1).

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

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

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

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

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

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

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

Number 3 is the only value possible in cell (1,4).

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

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

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

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

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

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

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

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

Number 8 is the only value possible in cell (7,3).

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

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

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

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

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

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

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

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

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