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

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

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

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

For row 8, number 7 is only possible in cell (3,8)

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

For row 6, number 1 is only possible in cell (2,6)

For column 7, Number 1 is only possible in cell (7,8)

For box 9, Number 6 is only possible in cell (8,8)

For column 9, Number 5 is only possible in cell (9,6)

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

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

Hidden Pair for 3 and 7, can remove other candidates from these cells.

Hidden Pair for 3 and 7, can remove other candidates from these cells.

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

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

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

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

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

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

For row 2, number 4 is only possible in cell (6,2)

For row 2, number 1 is only possible in cell (4,2)

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

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

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

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

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

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

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

Number 1 is the only value possible in cell (6,9).

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

For row 4, number 2 is only possible in cell (3,4)

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

For row 5, number 4 is only possible in cell (9,5)

For row 2, number 5 is only possible in cell (1,2)

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

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

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

For row 6, number 9 is only possible in cell (8,6)

For row 4, number 9 is only possible in cell (1,4)

For row 6, number 8 is only possible in cell (3,6)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Number 6 is the only value possible in cell (1,9).

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