Step-by-Step Solution

for Friday 8th May Tricky

First step:
Add in all possible valid pencilmarks.

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

Single Position

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

Single Position

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

Single Position

For row 5, number 4 is only possible in cell (6,5)

Single Position

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

Single Position

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

Single Position

For column 6, Number 1 is only possible in cell (6,1)

Single Position

For column 9, Number 1 is only possible in cell (9,5)

Single Position

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

Single Position

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

Single Position

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

Single Position

For box 7, Number 9 is only possible in cell (2,8)

Single Position

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

Single Candidate

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

Single Candidate

For row 9, number 2 is only possible in cell (5,9)

Single Position

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

Single Position

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

Single Candidate

For box 3, candidates for 9 are all in row 1, so you can remove candidates from other blocks.

Candidate Lines

For box 9, candidates for 8 are all in column 7, so you can remove candidates from other blocks.

Candidate Lines

For box 1, candidates for 7 are all in column 3, so you can remove candidates from other blocks.

Candidate Lines

Candidates for 8 in boxes 1 and 4 force the candidates in box 7 to be in the remaining line.

Multiple Lines

Hidden Pair for 2 and 9, can remove other candidates from these cells.

Hidden Pairs

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

Single Position

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 9 is the only value possible in cell (7,5).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 2 is the only value possible in cell (3,4).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 1 is the only value possible in cell (8,7).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 8 is the only value possible in cell (3,1).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 5 is the only value possible in cell (3,9).

Single Candidate