Step-By-Step Solution:

Initial Grid

Pencilmarked

First step:
Add in all possible valid pencilmarks.

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

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

For row 5, number 8 is only possible in cell (9,5)
(Single Position)

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

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

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

For row 3, number 4 is only possible in cell (5,3)
(Single Position)

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

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

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

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

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

For row 6, number 2 is only possible in cell (2,6)
(Single Position)

For column 1, Number 2 is only possible in cell (1,8)
(Single Position)

For row 1, number 3 is only possible in cell (8,1)
(Single Position)

For row 1, number 9 is only possible in cell (2,1)
(Single Position)

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

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

Number 9 is the only value possible in cell (1,4).
(Single Candidate)

For column 8, Number 5 is only possible in cell (8,3)
(Single Position)

For row 5, number 3 is only possible in cell (4,5)
(Single Position)

For row 7, number 3 is only possible in cell (2,7)
(Single Position)

For box 9, candidates for 2 are all in row 7, so you can remove candidates from other blocks.
(Candidate Lines)

For blocks 2 and 5, candidates for 6 are all in the same two columns (4 and 6)
(Double Pairs)

Hidden Pair for 2 and 5, can remove other candidates from these cells.
(Hidden Pairs)

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

For row 7, number 8 is only possible in cell (4,7)
(Single Position)

X-Wing in rows for 6.
(X-Wings)

Either candidate for cell (7,3) forces 9 into cell (8,2).
(Forcing Chains)

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

Swordfish in rows for 6.
(Swordfish)

Either candidate for cell (7,3) forces 7 into cell (3,6).
(Forcing Chains)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Number 7 is the only value possible in cell (2,8).
(Single Candidate)

Number 6 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 2 is the only value possible in cell (4,9).
(Single Candidate)

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

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

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