Step 0

Starting puzzle

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

Step 1

The number 2 does not yet appear in row A. Due to other 2s on the grid, the only place it can go is cell A9.

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

Step 2

The number 4 does not yet appear in row C. Due to other 4s on the grid, the only place it can go is cell C6.

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

Step 3

The number 6 does not yet appear in row B. Due to other 6s on the grid, the only place it can go is cell B3.

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

Step 4

The number 7 does not yet appear in row A. Due to other 7s on the grid, the only place it can go is cell A7.

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

Step 5

The number 3 does not yet appear in row E. Due to other 3s on the grid, the only place it can go is cell E5.

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

Step 6

The number 2 does not yet appear in row H. Due to other 2s on the grid, the only place it can go is cell H2.

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

Step 7

The number 8 does not yet appear in row H. Due to other 8s on the grid, the only place it can go is cell H7.

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

Step 8

The number 9 does not yet appear in column 2. Due to other 9s on the grid, the only place it can go is cell G2.

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

Step 9

The number 4 does not yet appear in column 9. Due to other 4s on the grid, the only place it can go is cell G9.

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

Step 10

The number 6 does not yet appear in column 7. Due to other 6s on the grid, the only place it can go is cell E7.

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

Step 11

The number 7 is missing from box G7-I9 and its only possible position is cell I8.

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

Step 12

I7 is the last empty cell in box G7-I9 and the missing number is 9.

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

Step 13

Because of the number 9 just placed, the only position in row H for another 9 is cell H6.

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

Step 14

The number 7 is missing from column 5 and its only possible position is cell H5.

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

Step 15

Because of the number 7 just placed, the only position in row G for another 7 is cell G3.

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

Step 16

B5 is the last empty cell in column 5 and the missing number is 5.

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

Step 17

The number 1 is missing from row G and its only possible position is cell G6.

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

Step 18

Because of the number 1 just placed, the only position in row I for another 1 is cell I1.

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

Step 19

G4 is the last empty cell in row G and the missing number is 5.

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

Step 20

I6 is the last empty cell in box G4-I6 and the missing number is 3.

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

Step 21

Because of the number 3 just placed, the only position in row H for another 3 is cell H3.

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

Step 22

Because of the number 3 just placed, the only position in column 2 for another 3 is cell A2.

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

Step 23

H1 is the last empty cell in row H and the missing number is 5.

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

Step 24

I3 is the last empty cell in box G1-I3 and the missing number is 4.

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

Step 25

Because of the number 4 just placed, the only position in column 1 for another 4 is cell E1.

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

Step 26

The number 7 does not yet appear in column 1. Due to other 7s on the grid, the only place it can go is cell D1.

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

Step 27

C1 is the last empty cell in column 1 and the missing number is 8.

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

Step 28

Because of the number 8 just placed, the only position in column 3 for another 8 is cell E3.

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

Step 29

A3 is the last empty cell in box A1-C3 and the missing number is 5.

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

Step 30

A4 is the last empty cell in row A and the missing number is 8.

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

Step 31

The number 7 does not yet appear in column 4. Due to other 7s on the grid, the only place it can go is cell F4.

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

Step 32

Because of the number 7 just placed, the only position in row E for another 7 is cell E9.

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

Step 33

The number 9 does not yet appear in row E. Due to other 9s on the grid, the only place it can go is cell E8.

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

Step 34

Because of the number 9 just placed, the only position in column 9 for another 9 is cell B9.

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

Step 35

Because of the number 9 just placed, the only position in row C for another 9 is cell C4.

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

Step 36

B4 is the last empty cell in box A4-C6 and the missing number is 3.

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

Step 37

Because of the number 3 just placed, the only position in row C for another 3 is cell C8.

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

Step 38

C7 is the last empty cell in row C and the missing number is 5.

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

Step 39

E2 is the last empty cell in row E and the missing number is 5.

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

Step 40

D4 is the last empty cell in column 4 and the missing number is 6.

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

Step 41

Because of the number 6 just placed, the only position in row F for another 6 is cell F2.

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

Step 42

D2 is the last empty cell in box D1-F3 and the missing number is 1.

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

Step 43

Because of the number 1 just placed, the only position in row F for another 1 is cell F8.

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

Step 44

B7 is the last empty cell in column 7 and the missing number is 1.

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

Step 45

B8 is the last empty cell in box A7-C9 and the missing number is 8.

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

Step 46

F9 is the last empty cell in column 9 and the missing number is 8.

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

Step 47

Because of the number 8 just placed, the only position in row D for another 8 is cell D6.

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

Step 48

F6 is the last empty cell in box D4-F6 and the missing number is 5.

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

Step 49

D8 is the last empty cell in row D and the missing number is 5.

Congratulations - the puzzle is solved!

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