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

For row 8, number 9 is only possible in cell (2,8)

For row 3, number 9 is only possible in cell (5,3)

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

For row 5, number 9 is only possible in cell (6,5)

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

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

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

For row 6, number 4 is only possible in cell (5,6)

For row 6, number 7 is only possible in cell (9,6)

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

For row 7, number 4 is only possible in cell (6,7)

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

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

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

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

For box 7, candidates for 8 are all in row 7, so you can remove candidates from other blocks.

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

For column 4, Number 8 is only possible in cell (4,2)

X-Wing in rows for 3.

Naked Triple for 1, 2 and 6, can remove these as candidates from other cells.

Hidden Pair for 1 and 3, can remove other candidates from these cells.

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

For box 2, Number 1 is only possible in cell (4,3)

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

For row 2, number 4 is only possible in cell (8,2)

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

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

For row 2, number 1 is only possible in cell (3,2)

Either candidate for cell (6,1) forces 2 into cell (6,8).

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

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

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

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

Number 5 is the only value possible in cell (3,1).

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

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

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

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

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

Number 1 is the only value possible in cell (7,4).

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

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

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

Number 8 is the only value possible in cell (3,6).

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

Number 8 is the only value possible in cell (1,7).

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

Number 1 is the only value possible in cell (5,7).

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

Number 3 is the only value possible in cell (5,8).

Number 5 is the only value possible in cell (7,8).

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

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

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

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

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