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

For row 6, number 9 is only possible in cell (4,6)

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

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

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

For box 4, Number 8 is only possible in cell (3,6)

For column 2, Number 5 is only possible in cell (2,3)

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

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

Hidden Pair for 5 and 9, can remove other candidates from these cells.

Either candidate for cell (7,5) forces 7 into cell (2,6).

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

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

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

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

For box 5, candidates for 6 are all in column 5, so you can remove candidates from other blocks.

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

For blocks 1 and 3, candidates for 2 are all in the same two rows (2 and 3)

X-Wing in rows for 6.

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

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

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

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

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

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

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

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

Either candidate for cell (4,7) forces 6 into cell (3,8).

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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