Step-by-Step Solution

for Tuesday 16th December Tricky

For row 7, number 1 is only possible in cell (3,7)

Single Position

For row 9, number 1 is only possible in cell (6,9)

Single Position

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

Single Position

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

Single Position

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

Single Position

For box 5, Number 4 is only possible in cell (6,6)

Single Position

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

Single Position

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

Single Candidate

For box 4, Number 9 is only possible in cell (2,6)

Single Position

For row 5, number 6 is only possible in cell (3,5)

Single Position

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

Candidate Lines

For box 2, candidates for 8 are all in row 1, so you can remove candidates from other blocks.

Candidate Lines

For box 6, candidates for 8 are all in column 8, so you can remove candidates from other blocks.

Candidate Lines

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

Candidate Lines

Candidates for 8 in boxes 4 and 6 force the candidates in box 5 to be in the remaining line.

Multiple Lines

Naked Pair for 5 and 6, can remove these as candidates from other cells.

Naked Pairs

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 8 is the only value possible in cell (6,1).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 2 is the only value possible in cell (9,3).

Single Candidate

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

Single Candidate

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

Single Candidate

Number 3 is the only value possible in cell (6,5).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate