## Step-By-Step Solution:

## Initial Grid | |

First step - add in all possible valid pencilmarks. |

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

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

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

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

For row 5, number 1 is only possible in cell (6,5) | ||

For column 3, Number 7 is only possible in cell (3,9) | ||

For row 8, number 7 is only possible in cell (9,8) | ||

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

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

For column 3, Number 9 is only possible in cell (3,7) | ||

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

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

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

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

Number 9 is the only value possible in cell (4,8). | ||

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

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

Either candidate for cell (2,1) forces 5 into cell (2,9). | ||

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

Either candidate for cell (1,5) forces 7 into cell (2,6). | ||

For row 5, number 7 is only possible in cell (4,5) | ||

Either candidate for cell (7,1) forces 5 into cell (1,6). | ||

For box 4, candidates for 9 are all in row 5, so you can remove candidates from other blocks. | ||

Hidden Pair for 4 and 5, can remove other candidates from these cells. | ||

Either candidate for cell (8,5) forces 6 into cell (4,9). | ||

Candidates for 4 in boxes 5 and 8 force the candidates in box 2 to be in the remaining line. | ||

Either candidate for cell (7,1) forces 6 into cell (5,6). | ||

Either candidate for cell (9,6) forces 8 into cell (2,1). | ||

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

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

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

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

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

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

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

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

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

Number 9 is the only value possible in cell (2,5). | ||

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

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

Number 2 is the only value possible in cell (9,5). | ||

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

Number 7 is the only value possible in cell (6,2). | ||

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

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

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

Number 6 is the only value possible in cell (9,1). | ||

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

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

Number 3 is the only value possible in cell (8,2). | ||

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

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

Number 8 is the only value possible in cell (5,4). | ||

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

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

Number 4 is the only value possible in cell (7,6). | ||

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

Number 2 is the only value possible in cell (5,9). | ||

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