For row 4, number 8 is only possible in cell (2,4)

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

For row 4, number 6 is only possible in cell (9,4)

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

For row 3, number 6 is only possible in cell (2,3)

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

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

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

For row 9, number 4 is only possible in cell (7,9)

For row 8, number 6 is only possible in cell (5,8)

For box 8, candidates for 3 are all in column 4, so you can remove candidates from other blocks.

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

For box 9, candidates for 1 are all in row 8, so you can remove candidates from other blocks.

For box 3, candidates for 5 are all in row 1, so you can remove candidates from other blocks.

For box 5, candidates for 5 are all in row 6, so you can remove candidates from other blocks.

Hidden Pair for 5 and 9, can remove other candidates from these cells.

Hidden Triple for 1, 3 and 7, can remove other candidates from these cells.

Candidates for 2 in boxes 1 and 7 force the candidates in box 4 to be in the remaining line.

Candidates for 2 in boxes 4 and 5 force the candidates in box 6 to be in the remaining line.

Number 4 is the only value possible in cell (9,6).

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

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

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

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

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

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

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

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

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

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

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

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

For row 1, number 8 is only possible in cell (8,1)

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

For column 2, Number 2 is only possible in cell (2,8)

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

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

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

For row 7, number 5 is only possible in cell (6,7)

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

Number 9 is the only value possible in cell (6,4).

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

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

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

Number 2 is the only value possible in cell (8,5).

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

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

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

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

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

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

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

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

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

Number 7 is the only value possible in cell (5,6).

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

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

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

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

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

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

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

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

Number 3 is the only value possible in cell (4,9).