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

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

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

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

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

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

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

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

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

For row 9, number 4 is only possible in cell (3,9)

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

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

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

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

For blocks 2 and 8, candidates for 7 are all in the same two columns (5 and 6)

Candidates for 4 in boxes 1 and 3 force the candidates in box 2 to be in the remaining line.

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

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

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

For row 9, number 2 is only possible in cell (5,9)

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

For box 8, candidates for 9 are all in column 4, so you can remove candidates from other blocks.

X-Wing in rows for 5.

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

Either candidate for cell (4,7) forces 3 into cell (4,9).

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Number 3 is the only value possible in cell (6,5).

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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