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

Number 3 is the only value possible in cell (5,2).

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

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

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

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

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

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

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

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

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

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

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

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

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

For row 9, number 8 is only possible in cell (4,9)

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

For column 6, Number 9 is only possible in cell (6,1)

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

Naked Triple for 1, 4 and 5, can remove these as candidates from other cells.

X-Wing in rows for 2.

X-Wing in rows for 5.

Hidden Triple for 1, 5 and 7, can remove other candidates from these cells.

Naked Pair for 1 and 5, can remove these as candidates from other cells.

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

Either candidate for cell (7,2) forces 4 into cell (8,3).

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

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

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

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

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

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

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

Number 1 is the only value possible in cell (7,3).

Number 1 is the only value possible in cell (8,5).

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

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

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

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

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

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

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

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

Number 3 is the only value possible in cell (9,4).

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

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

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

Number 9 is the only value possible in cell (3,6).

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

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

Number 4 is the only value possible in cell (1,8).

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

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

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

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

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

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

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

Number 2 is the only value possible in cell (6,9).

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

Number 5 is the only value possible in cell (8,9).