## Step-By-Step Solution:

### Pencilmarked

First step:
Add in all possible valid pencilmarks.

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

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

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

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

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

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

Number 6 is the only value possible in cell (9,2).
(Single Candidate)

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

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

For row 9, number 4 is only possible in cell (3,9)
(Single Position)

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

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

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

For row 1, number 5 is only possible in cell (3,1)
(Single Position)

For blocks 2 and 8, candidates for 7 are all in the same two columns (5 and 6)
(Double Pairs)

Candidates for 4 in boxes 1 and 3 force the candidates in box 2 to be in the remaining line.
(Multiple Lines)

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

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

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

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

Hidden Pair for 1 and 5, can remove other candidates from these cells.
(Hidden Pairs)

For box 8, candidates for 9 are all in column 4, so you can remove candidates from other blocks.
(Candidate Lines)

X-Wing in rows for 5.
(X-Wings)

Naked Pair for 1 and 3, can remove these as candidates from other cells.
(Naked Pairs)

Either candidate for cell (4,7) forces 3 into cell (4,9).
(Forcing Chains)

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

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

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

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

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

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

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

Number 9 is the only value possible in cell (4,7).
(Single Candidate)

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

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

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

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

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

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

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

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

Number 3 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 4 is the only value possible in cell (7,1).
(Single Candidate)

Number 8 is the only value possible in cell (2,1).
(Single Candidate)

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

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

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

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

Number 9 is the only value possible in cell (7,4).
(Single Candidate)

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

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

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

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

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

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

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

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

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

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

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

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

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

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This solution was created by the same Sudoku Engine used in Astraware Sudoku Of The Day which also provides the hints for the game by highlighting areas for you to look at rather than simply giving away the answers – ideal if you’re trying to improve your skill level as it will allow you to develop your skill at each of the Sudoku Solving Techniques!

There’s often various ways you can solve a Sudoku puzzle, so don’t worry if you found a different route to the same final answer!