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

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

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

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

Number 6 is the only value possible in cell (7,9).

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

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

For column 5, Number 9 is only possible in cell (5,6)

For column 9, Number 9 is only possible in cell (9,8)

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

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

For row 9, number 4 is only possible in cell (1,9)

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

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

For column 5, Number 4 is only possible in cell (5,4)

For box 2, candidates for 2 are all in column 4, so you can remove candidates from other blocks.

Naked Triple for 2, 3 and 6, can remove these as candidates from other cells.

For box 4, candidates for 6 are all in column 1, so you can remove candidates from other blocks.

X-Wing in rows for 7.

X-Wing in rows for 3.

For box 4, candidates for 3 are all in column 1, so you can remove candidates from other blocks.

Number 7 is the only value possible in cell (1,2).

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

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

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

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

Number 6 is the only value possible in cell (1,4).

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

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

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

Number 7 is the only value possible in cell (3,5).

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

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

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

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

Number 7 is the only value possible in cell (4,6).

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

Number 1 is the only value possible in cell (2,7).

Number 3 is the only value possible in cell (4,7).

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

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

Number 7 is the only value possible in cell (6,8).

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

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

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

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

Number 2 is the only value possible in cell (3,1).

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

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

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

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

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

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

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

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

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

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

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

Number 1 is the only value possible in cell (5,9).

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