Step-by-Step Solution

for Sunday 12th January Tricky

For box 9, Number 7 is only possible in cell (9,9)

Single Position

For row 7, number 2 is only possible in cell (8,7)

Single Position

For column 2, Number 3 is only possible in cell (2,9)

Single Position

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

For column 7, Number 8 is only possible in cell (7,4)

Single Position

For row 6, number 3 is only possible in cell (9,6)

Single Position

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

Single Candidate

For column 8, Number 1 is only possible in cell (8,4)

Single Position

For column 9, Number 4 is only possible in cell (9,2)

Single Position

For box 6, Number 5 is only possible in cell (8,6)

Single Position

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

Single Candidate

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

Single Candidate

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

Candidate Lines

For box 7, candidates for 4 are all in row 7, so you can remove candidates from other blocks.

Candidate Lines

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

Multiple Lines

Candidates for 5 in boxes 1 and 4 force the candidates in box 7 to be in the remaining line.

Multiple Lines

Naked Pair for 4 and 9, can remove these as candidates from other cells.

Naked Pairs

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

Single Position

For column 6, Number 8 is only possible in cell (6,2)

Single Position

Naked Pair for 4 and 9, can remove these as candidates from other cells.

Naked Pairs

For row 2, number 9 is only possible in cell (3,2)

Single Position

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 9 is the only value possible in cell (2,7).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 6 is the only value possible in cell (1,4).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate