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

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

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

For row 2, number 9 is only possible in cell (4,2)

For row 2, number 7 is only possible in cell (6,2)

For row 1, number 7 is only possible in cell (8,1)

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

For row 3, number 9 is only possible in cell (8,3)

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

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

For column 8, Number 1 is only possible in cell (8,7)

For row 1, number 8 is only possible in cell (7,1)

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

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

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

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

Number 3 is the only value possible in cell (5,4).

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

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

For box 9, candidates for 5 are all in column 9, so you can remove candidates from other blocks.

Naked Pair for 3 and 5, can remove these as candidates from other cells.

X-Wing in columns for 2.

Either candidate for cell (2,7) forces 8 into cell (8,8).

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

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

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

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

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

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

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

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

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

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

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

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

Number 8 is the only value possible in cell (9,4).

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

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

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

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

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

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

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

Number 2 is the only value possible in cell (6,3).

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

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

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

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

Number 8 is the only value possible in cell (6,5).

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

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

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

Number 8 is the only value possible in cell (4,9).

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

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