Step 0

Starting puzzle
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2          
C 4   8     6      
D 7 4   5       1 2
E   2   7 6 9   4  
F 8 3       1   5 6
G       6     5   7
H           2 8 3  
I   7   9   5     1

Step 1

The number 2 does not yet appear in row F. Due to other 2s on the grid, the only place it can go is cell F5.
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2          
C 4   8     6      
D 7 4   5       1 2
E   2   7 6 9   4  
F 8 3     2 1   5 6
G       6     5   7
H           2 8 3  
I   7   9   5     1

Step 2

The number 4 does not yet appear in row F. Due to other 4s on the grid, the only place it can go is cell F4.
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2          
C 4   8     6      
D 7 4   5       1 2
E   2   7 6 9   4  
F 8 3   4 2 1   5 6
G       6     5   7
H           2 8 3  
I   7   9   5     1

Step 3

The number 6 does not yet appear in row D. Due to other 6s on the grid, the only place it can go is cell D3.
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2          
C 4   8     6      
D 7 4 6 5       1 2
E   2   7 6 9   4  
F 8 3   4 2 1   5 6
G       6     5   7
H           2 8 3  
I   7   9   5     1

Step 4

The number 7 does not yet appear in row F. Due to other 7s on the grid, the only place it can go is cell F7.
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2          
C 4   8     6      
D 7 4 6 5       1 2
E   2   7 6 9   4  
F 8 3   4 2 1 7 5 6
G       6     5   7
H           2 8 3  
I   7   9   5     1

Step 5

Because of the number 7 just placed, the only position in column 8 for another 7 is cell C8.
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2          
C 4   8     6   7  
D 7 4 6 5       1 2
E   2   7 6 9   4  
F 8 3   4 2 1 7 5 6
G       6     5   7
H           2 8 3  
I   7   9   5     1

Step 6

F3 is the last empty cell in row F and the missing number is 9.
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2          
C 4   8     6   7  
D 7 4 6 5       1 2
E   2   7 6 9   4  
F 8 3 9 4 2 1 7 5 6
G       6     5   7
H           2 8 3  
I   7   9   5     1

Step 7

Because of the number 9 just placed, the only position in row D for another 9 is cell D7.
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2          
C 4   8     6   7  
D 7 4 6 5     9 1 2
E   2   7 6 9   4  
F 8 3 9 4 2 1 7 5 6
G       6     5   7
H           2 8 3  
I   7   9   5     1

Step 8

Because of the number 9 just placed, the only position in column 9 for another 9 is cell H9.
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2          
C 4   8     6   7  
D 7 4 6 5     9 1 2
E   2   7 6 9   4  
F 8 3 9 4 2 1 7 5 6
G       6     5   7
H           2 8 3 9
I   7   9   5     1

Step 9

The number 7 does not yet appear in row H. Due to other 7s on the grid, the only place it can go is cell H5.
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2          
C 4   8     6   7  
D 7 4 6 5     9 1 2
E   2   7 6 9   4  
F 8 3 9 4 2 1 7 5 6
G       6     5   7
H         7 2 8 3 9
I   7   9   5     1

Step 10

The number 8 does not yet appear in column 2. Due to other 8s on the grid, the only place it can go is cell G2.
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2          
C 4   8     6   7  
D 7 4 6 5     9 1 2
E   2   7 6 9   4  
F 8 3 9 4 2 1 7 5 6
G   8   6     5   7
H         7 2 8 3 9
I   7   9   5     1

Step 11

Because of the number 8 just placed, the only position in row I for another 8 is cell I5.
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2          
C 4   8     6   7  
D 7 4 6 5     9 1 2
E   2   7 6 9   4  
F 8 3 9 4 2 1 7 5 6
G   8   6     5   7
H         7 2 8 3 9
I   7   9 8 5     1

Step 12

Because of the number 8 just placed, the only position in column 6 for another 8 is cell D6.
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2          
C 4   8     6   7  
D 7 4 6 5   8 9 1 2
E   2   7 6 9   4  
F 8 3 9 4 2 1 7 5 6
G   8   6     5   7
H         7 2 8 3 9
I   7   9 8 5     1

Step 13

Because of the number 8 just placed, the only position in row E for another 8 is cell E9.
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2          
C 4   8     6   7  
D 7 4 6 5   8 9 1 2
E   2   7 6 9   4 8
F 8 3 9 4 2 1 7 5 6
G   8   6     5   7
H         7 2 8 3 9
I   7   9 8 5     1

Step 14

Because of the number 8 just placed, the only position in column 8 for another 8 is cell B8.
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2       8  
C 4   8     6   7  
D 7 4 6 5   8 9 1 2
E   2   7 6 9   4 8
F 8 3 9 4 2 1 7 5 6
G   8   6     5   7
H         7 2 8 3 9
I   7   9 8 5     1

Step 15

D5 is the last empty cell in box D4-F6 and the missing number is 3.
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2       8  
C 4   8     6   7  
D 7 4 6 5 3 8 9 1 2
E   2   7 6 9   4 8
F 8 3 9 4 2 1 7 5 6
G   8   6     5   7
H         7 2 8 3 9
I   7   9 8 5     1

Step 16

Because of the number 3 just placed, the only position in row E for another 3 is cell E7.
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2       8  
C 4   8     6   7  
D 7 4 6 5 3 8 9 1 2
E   2   7 6 9 3 4 8
F 8 3 9 4 2 1 7 5 6
G   8   6     5   7
H         7 2 8 3 9
I   7   9 8 5     1

Step 17

The number 9 does not yet appear in row G. Due to other 9s on the grid, the only place it can go is cell G1.
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2       8  
C 4   8     6   7  
D 7 4 6 5 3 8 9 1 2
E   2   7 6 9 3 4 8
F 8 3 9 4 2 1 7 5 6
G 9 8   6     5   7
H         7 2 8 3 9
I   7   9 8 5     1

Step 18

Because of the number 9 just placed, the only position in column 2 for another 9 is cell C2.
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2       8  
C 4 9 8     6   7  
D 7 4 6 5 3 8 9 1 2
E   2   7 6 9 3 4 8
F 8 3 9 4 2 1 7 5 6
G 9 8   6     5   7
H         7 2 8 3 9
I   7   9 8 5     1

Step 19

Because of the number 9 just placed, the only position in row B for another 9 is cell B5.
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2 9     8  
C 4 9 8     6   7  
D 7 4 6 5 3 8 9 1 2
E   2   7 6 9 3 4 8
F 8 3 9 4 2 1 7 5 6
G 9 8   6     5   7
H         7 2 8 3 9
I   7   9 8 5     1

Step 20

The number 3 is missing from column 4 and its only possible position is cell C4.
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2 9     8  
C 4 9 8 3   6   7  
D 7 4 6 5 3 8 9 1 2
E   2   7 6 9 3 4 8
F 8 3 9 4 2 1 7 5 6
G 9 8   6     5   7
H         7 2 8 3 9
I   7   9 8 5     1

Step 21

Because of the number 3 just placed, the only position in row B for another 3 is cell B9.
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2 9     8 3
C 4 9 8 3   6   7  
D 7 4 6 5 3 8 9 1 2
E   2   7 6 9 3 4 8
F 8 3 9 4 2 1 7 5 6
G 9 8   6     5   7
H         7 2 8 3 9
I   7   9 8 5     1

Step 22

Because of the number 3 just placed, the only position in column 6 for another 3 is cell G6.
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2 9     8 3
C 4 9 8 3   6   7  
D 7 4 6 5 3 8 9 1 2
E   2   7 6 9 3 4 8
F 8 3 9 4 2 1 7 5 6
G 9 8   6   3 5   7
H         7 2 8 3 9
I   7   9 8 5     1

Step 23

Because of the number 3 just placed, the only position in row I for another 3 is cell I3.
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2 9     8 3
C 4 9 8 3   6   7  
D 7 4 6 5 3 8 9 1 2
E   2   7 6 9 3 4 8
F 8 3 9 4 2 1 7 5 6
G 9 8   6   3 5   7
H         7 2 8 3 9
I   7 3 9 8 5     1

Step 24

H4 is the last empty cell in column 4 and the missing number is 1.
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2 9     8 3
C 4 9 8 3   6   7  
D 7 4 6 5 3 8 9 1 2
E   2   7 6 9 3 4 8
F 8 3 9 4 2 1 7 5 6
G 9 8   6   3 5   7
H       1 7 2 8 3 9
I   7 3 9 8 5     1

Step 25

Because of the number 1 just placed, the only position in row G for another 1 is cell G3.
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2 9     8 3
C 4 9 8 3   6   7  
D 7 4 6 5 3 8 9 1 2
E   2   7 6 9 3 4 8
F 8 3 9 4 2 1 7 5 6
G 9 8 1 6   3 5   7
H       1 7 2 8 3 9
I   7 3 9 8 5     1

Step 26

Because of the number 1 just placed, the only position in column 1 for another 1 is cell E1.
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2 9     8 3
C 4 9 8 3   6   7  
D 7 4 6 5 3 8 9 1 2
E 1 2   7 6 9 3 4 8
F 8 3 9 4 2 1 7 5 6
G 9 8 1 6   3 5   7
H       1 7 2 8 3 9
I   7 3 9 8 5     1

Step 27

E3 is the last empty cell in box D1-F3 and the missing number is 5.
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2 9     8 3
C 4 9 8 3   6   7  
D 7 4 6 5 3 8 9 1 2
E 1 2 5 7 6 9 3 4 8
F 8 3 9 4 2 1 7 5 6
G 9 8 1 6   3 5   7
H       1 7 2 8 3 9
I   7 3 9 8 5     1

Step 28

G5 is the last empty cell in box G4-I6 and the missing number is 4.
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2 9     8 3
C 4 9 8 3   6   7  
D 7 4 6 5 3 8 9 1 2
E 1 2 5 7 6 9 3 4 8
F 8 3 9 4 2 1 7 5 6
G 9 8 1 6 4 3 5   7
H       1 7 2 8 3 9
I   7 3 9 8 5     1

Step 29

B6 is the last empty cell in column 6 and the missing number is 4.
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2 9 4   8 3
C 4 9 8 3   6   7  
D 7 4 6 5 3 8 9 1 2
E 1 2 5 7 6 9 3 4 8
F 8 3 9 4 2 1 7 5 6
G 9 8 1 6 4 3 5   7
H       1 7 2 8 3 9
I   7 3 9 8 5     1

Step 30

G8 is the last empty cell in row G and the missing number is 2.
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2 9 4   8 3
C 4 9 8 3   6   7  
D 7 4 6 5 3 8 9 1 2
E 1 2 5 7 6 9 3 4 8
F 8 3 9 4 2 1 7 5 6
G 9 8 1 6 4 3 5 2 7
H       1 7 2 8 3 9
I   7 3 9 8 5     1

Step 31

Because of the number 2 just placed, the only position in row I for another 2 is cell I1.
1 2 3 4 5 6 7 8 9
A 3     8   7   9  
B   1 7 2 9 4   8 3
C 4 9 8 3   6   7  
D 7 4 6 5 3 8 9 1 2
E 1 2 5 7 6 9 3 4 8
F 8 3 9 4 2 1 7 5 6
G 9 8 1 6 4 3 5 2 7
H       1 7 2 8 3 9
I 2 7 3 9 8 5     1

Step 32

Because of the number 2 just placed, the only position in column 3 for another 2 is cell A3.
1 2 3 4 5 6 7 8 9
A 3   2 8   7   9  
B   1 7 2 9 4   8 3
C 4 9 8 3   6   7  
D 7 4 6 5 3 8 9 1 2
E 1 2 5 7 6 9 3 4 8
F 8 3 9 4 2 1 7 5 6
G 9 8 1 6 4 3 5 2 7
H       1 7 2 8 3 9
I 2 7 3 9 8 5     1

Step 33

Because of the number 2 just placed, the only position in row C for another 2 is cell C7.
1 2 3 4 5 6 7 8 9
A 3   2 8   7   9  
B   1 7 2 9 4   8 3
C 4 9 8 3   6 2 7  
D 7 4 6 5 3 8 9 1 2
E 1 2 5 7 6 9 3 4 8
F 8 3 9 4 2 1 7 5 6
G 9 8 1 6 4 3 5 2 7
H       1 7 2 8 3 9
I 2 7 3 9 8 5     1

Step 34

H3 is the last empty cell in column 3 and the missing number is 4.
1 2 3 4 5 6 7 8 9
A 3   2 8   7   9  
B   1 7 2 9 4   8 3
C 4 9 8 3   6 2 7  
D 7 4 6 5 3 8 9 1 2
E 1 2 5 7 6 9 3 4 8
F 8 3 9 4 2 1 7 5 6
G 9 8 1 6 4 3 5 2 7
H     4 1 7 2 8 3 9
I 2 7 3 9 8 5     1

Step 35

Because of the number 4 just placed, the only position in row I for another 4 is cell I7.
1 2 3 4 5 6 7 8 9
A 3   2 8   7   9  
B   1 7 2 9 4   8 3
C 4 9 8 3   6 2 7  
D 7 4 6 5 3 8 9 1 2
E 1 2 5 7 6 9 3 4 8
F 8 3 9 4 2 1 7 5 6
G 9 8 1 6 4 3 5 2 7
H     4 1 7 2 8 3 9
I 2 7 3 9 8 5 4   1

Step 36

Because of the number 4 just placed, the only position in column 9 for another 4 is cell A9.
1 2 3 4 5 6 7 8 9
A 3   2 8   7   9 4
B   1 7 2 9 4   8 3
C 4 9 8 3   6 2 7  
D 7 4 6 5 3 8 9 1 2
E 1 2 5 7 6 9 3 4 8
F 8 3 9 4 2 1 7 5 6
G 9 8 1 6 4 3 5 2 7
H     4 1 7 2 8 3 9
I 2 7 3 9 8 5 4   1

Step 37

I8 is the last empty cell in box G7-I9 and the missing number is 6.
1 2 3 4 5 6 7 8 9
A 3   2 8   7   9 4
B   1 7 2 9 4   8 3
C 4 9 8 3   6 2 7  
D 7 4 6 5 3 8 9 1 2
E 1 2 5 7 6 9 3 4 8
F 8 3 9 4 2 1 7 5 6
G 9 8 1 6 4 3 5 2 7
H     4 1 7 2 8 3 9
I 2 7 3 9 8 5 4 6 1

Step 38

C9 is the last empty cell in column 9 and the missing number is 5.
1 2 3 4 5 6 7 8 9
A 3   2 8   7   9 4
B   1 7 2 9 4   8 3
C 4 9 8 3   6 2 7 5
D 7 4 6 5 3 8 9 1 2
E 1 2 5 7 6 9 3 4 8
F 8 3 9 4 2 1 7 5 6
G 9 8 1 6 4 3 5 2 7
H     4 1 7 2 8 3 9
I 2 7 3 9 8 5 4 6 1

Step 39

C5 is the last empty cell in row C and the missing number is 1.
1 2 3 4 5 6 7 8 9
A 3   2 8   7   9 4
B   1 7 2 9 4   8 3
C 4 9 8 3 1 6 2 7 5
D 7 4 6 5 3 8 9 1 2
E 1 2 5 7 6 9 3 4 8
F 8 3 9 4 2 1 7 5 6
G 9 8 1 6 4 3 5 2 7
H     4 1 7 2 8 3 9
I 2 7 3 9 8 5 4 6 1

Step 40

Because of the number 1 just placed, the only position in row A for another 1 is cell A7.
1 2 3 4 5 6 7 8 9
A 3   2 8   7 1 9 4
B   1 7 2 9 4   8 3
C 4 9 8 3 1 6 2 7 5
D 7 4 6 5 3 8 9 1 2
E 1 2 5 7 6 9 3 4 8
F 8 3 9 4 2 1 7 5 6
G 9 8 1 6 4 3 5 2 7
H     4 1 7 2 8 3 9
I 2 7 3 9 8 5 4 6 1

Step 41

A5 is the last empty cell in box A4-C6 and the missing number is 5.
1 2 3 4 5 6 7 8 9
A 3   2 8 5 7 1 9 4
B   1 7 2 9 4   8 3
C 4 9 8 3 1 6 2 7 5
D 7 4 6 5 3 8 9 1 2
E 1 2 5 7 6 9 3 4 8
F 8 3 9 4 2 1 7 5 6
G 9 8 1 6 4 3 5 2 7
H     4 1 7 2 8 3 9
I 2 7 3 9 8 5 4 6 1

Step 42

Because of the number 5 just placed, the only position in row B for another 5 is cell B1.
1 2 3 4 5 6 7 8 9
A 3   2 8 5 7 1 9 4
B 5 1 7 2 9 4   8 3
C 4 9 8 3 1 6 2 7 5
D 7 4 6 5 3 8 9 1 2
E 1 2 5 7 6 9 3 4 8
F 8 3 9 4 2 1 7 5 6
G 9 8 1 6 4 3 5 2 7
H     4 1 7 2 8 3 9
I 2 7 3 9 8 5 4 6 1

Step 43

Because of the number 5 just placed, the only position in column 2 for another 5 is cell H2.
1 2 3 4 5 6 7 8 9
A 3   2 8 5 7 1 9 4
B 5 1 7 2 9 4   8 3
C 4 9 8 3 1 6 2 7 5
D 7 4 6 5 3 8 9 1 2
E 1 2 5 7 6 9 3 4 8
F 8 3 9 4 2 1 7 5 6
G 9 8 1 6 4 3 5 2 7
H   5 4 1 7 2 8 3 9
I 2 7 3 9 8 5 4 6 1

Step 44

A2 is the last empty cell in box A1-C3 and the missing number is 6.
1 2 3 4 5 6 7 8 9
A 3 6 2 8 5 7 1 9 4
B 5 1 7 2 9 4   8 3
C 4 9 8 3 1 6 2 7 5
D 7 4 6 5 3 8 9 1 2
E 1 2 5 7 6 9 3 4 8
F 8 3 9 4 2 1 7 5 6
G 9 8 1 6 4 3 5 2 7
H   5 4 1 7 2 8 3 9
I 2 7 3 9 8 5 4 6 1

Step 45

B7 is the last empty cell in row B and the missing number is 6.
1 2 3 4 5 6 7 8 9
A 3 6 2 8 5 7 1 9 4
B 5 1 7 2 9 4 6 8 3
C 4 9 8 3 1 6 2 7 5
D 7 4 6 5 3 8 9 1 2
E 1 2 5 7 6 9 3 4 8
F 8 3 9 4 2 1 7 5 6
G 9 8 1 6 4 3 5 2 7
H   5 4 1 7 2 8 3 9
I 2 7 3 9 8 5 4 6 1

Step 46

H1 is the last empty cell in column 1 and the missing number is 6.

Congratulations - the puzzle is solved!
1 2 3 4 5 6 7 8 9
A 3 6 2 8 5 7 1 9 4
B 5 1 7 2 9 4 6 8 3
C 4 9 8 3 1 6 2 7 5
D 7 4 6 5 3 8 9 1 2
E 1 2 5 7 6 9 3 4 8
F 8 3 9 4 2 1 7 5 6
G 9 8 1 6 4 3 5 2 7
H 6 5 4 1 7 2 8 3 9
I 2 7 3 9 8 5 4 6 1
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