Number 5 is the only value possible in cell (2,1).

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

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

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

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

Number 3 is the only value possible in cell (8,2).

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Number 8 is the only value possible in cell (4,9).

For row 2, number 5 is only possible in cell (4,2)

For row 8, number 3 is only possible in cell (4,8)

For box 7, candidates for 1 are all in row 7, so you can remove candidates from other blocks.

For box 1, candidates for 4 are all in row 2, so you can remove candidates from other blocks.

For box 1, candidates for 6 are all in row 2, so you can remove candidates from other blocks.

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

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

Either candidate for cell (4,1) forces 8 into cell (6,1).

Either candidate for cell (5,6) forces 4 into cell (3,2).

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Number 9 is the only value possible in cell (5,7).

Number 7 is the only value possible in cell (5,2).

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

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

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

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

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

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

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