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

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

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

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

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

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

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

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

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

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

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

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

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

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

For row 3, number 5 is only possible in cell (1,3)

For row 3, number 4 is only possible in cell (3,3)

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

For box 3, candidates for 9 are all in column 7, so you can remove candidates from other blocks.

Number 2 is the only value possible in cell (7,8).

Naked Pair for 2 and 4, can remove these as candidates from other cells.

Naked Pair for 1 and 7, can remove these as candidates from other cells.

For box 6, candidates for 7 are all in row 6, so you can remove candidates from other blocks.

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

Naked Pair for 6 and 9, can remove these as candidates from other cells.

Naked Triple for 6, 8 and 9, can remove these as candidates from other cells.

X-Wing in rows for 8.

Either candidate for cell (1,2) forces 2 into cell (9,5).

Either candidate for cell (2,1) forces 8 into cell (2,5).

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

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

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

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

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

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

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

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

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

Number 1 is the only value possible in cell (2,4).

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

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

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

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

Number 6 is the only value possible in cell (9,8).

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

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

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

Number 6 is the only value possible in cell (1,7).

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

Number 2 is the only value possible in cell (1,4).

Number 9 is the only value possible in cell (1,2).

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

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

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

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

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

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

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

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

Number 9 is the only value possible in cell (3,8).

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

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

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

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