## Step-By-Step Solution:

### Pencilmarked

First step:
Add in all possible valid pencilmarks.

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

For row 3, number 3 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 (5,7)
(Single Position)

For column 5, Number 8 is only possible in cell (5,6)
(Single Position)

For column 1, Number 7 is only possible in cell (1,5)
(Single Position)

For column 5, Number 7 is only possible in cell (5,4)
(Single Position)

For box 6, Number 4 is only possible in cell (7,6)
(Single Position)

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

For box 3, candidates for 9 are all in column 9, so you can remove candidates from other blocks.
(Candidate Lines)

For box 8, candidates for 9 are all in column 6, so you can remove candidates from other blocks.
(Candidate Lines)

For box 5, candidates for 5 are all in column 6, so you can remove candidates from other blocks.
(Candidate Lines)

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

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 (7,2).
(Single Candidate)

For row 1, number 8 is only possible in cell (2,1)
(Single Position)

For box 3, candidates for 5 are all in column 9, so you can remove candidates from other blocks.
(Candidate Lines)

Hidden Pair for 7 and 9, can remove other candidates from these cells.
(Hidden Pairs)

For row 7, number 5 is only possible in cell (7,7)
(Single Position)

Hidden Pair for 7 and 9, can remove other candidates from these cells.
(Hidden Pairs)

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

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

Either candidate for cell (1,7) forces 5 into cell (1,2).
(Forcing Chains)

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

Either candidate for cell (2,7) forces 7 into cell (6,1).
(Forcing Chains)

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

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

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

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

Either candidate for cell (2,7) forces 5 into cell (8,4).
(Forcing Chains)

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

Either candidate for cell (1,9) forces 9 into cell (3,5).
(Forcing Chains)

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

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

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

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

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

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

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

For box 7, candidates for 6 are all in row 7, so you can remove candidates from other blocks.
(Candidate Lines)

For box 4, candidates for 1 are all in column 2, so you can remove candidates from other blocks.
(Candidate Lines)

Either candidate for cell (3,8) forces 2 into cell (6,9).
(Forcing Chains)

Number 4 is the only value possible in cell (6,8).
(Single Candidate)

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

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

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

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

Number 1 is the only value possible in cell (2,5).
(Single Candidate)

Number 5 is the only value possible in cell (2,6).
(Single Candidate)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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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!