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

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

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

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

For row 8, number 3 is only possible in cell (2,8)

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

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

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

For row 2, number 8 is only possible in cell (6,2)

For row 5, number 8 is only possible in cell (3,5)

For row 8, number 8 is only possible in cell (7,8)

For row 7, number 8 is only possible in cell (5,7)

For column 3, Number 6 is only possible in cell (3,2)

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

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

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

For box 5, candidates for 2 are all in column 5, so you can remove candidates from other blocks.

Naked Pair for 1 and 9, can remove these as candidates from other cells.

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

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

Naked Triple for 2, 5 and 7, can remove these as candidates from other cells.

Naked Pair for 1 and 9, can remove these as candidates from other cells.

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

Either candidate for cell (9,4) forces 1 into cell (4,4).

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

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

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

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

For row 7, number 9 is only possible in cell (8,7)

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

Either candidate for cell (7,7) forces 5 into cell (2,7).

For column 3, Number 5 is only possible in cell (3,1)

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

For row 3, number 7 is only possible in cell (5,3)

Either candidate for cell (7,7) forces 1 into cell (3,9).

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

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

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

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

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

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

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

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

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

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

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

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

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

Number 3 is the only value possible in cell (5,4).

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

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

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

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

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

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

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

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

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

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

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