Step-by-Step Solution

for Monday 13th January Tricky

For row 4, number 9 is only possible in cell (2,4)

Single Position

For row 3, number 9 is only possible in cell (7,3)

Single Position

For column 6, Number 9 is only possible in cell (6,7)

Single Position

For row 3, number 4 is only possible in cell (6,3)

Single Position

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

Single Position

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

Single Position

For row 4, number 3 is only possible in cell (7,4)

Single Position

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

Single Position

For row 3, number 7 is only possible in cell (9,3)

Single Position

For column 7, Number 7 is only possible in cell (7,5)

Single Position

For box 1, candidates for 8 are all in column 3, so you can remove candidates from other blocks.

Candidate Lines

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

Naked Pairs

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

Single Candidate

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

Naked Pairs

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 2 and 7, can remove these as candidates from other cells.

Naked Pairs

For box 8, Number 7 is only possible in cell (5,9)

Single Position

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

Single Position

For row 4, number 8 is only possible in cell (9,4)

Single Position

For row 6, number 8 is only possible in cell (4,6)

Single Position

For column 2, Number 7 is only possible in cell (2,6)

Single Position

Number 4 is the only value possible in cell (3,6).

Single Candidate

Number 3 is the only value possible in cell (1,6).

Single Candidate

For row 8, number 4 is only possible in cell (1,8)

Single Position

For row 8, number 9 is only possible in cell (3,8)

Single Position

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

Single Position

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

Single Position

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

Single Position

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 6 is the only value possible in cell (8,7).

Single Candidate

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

Single Candidate

Number 1 is the only value possible in cell (8,5).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate