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Classic Sudoku - Step-by-Step Solution for Puzzle 1-1

Puzzle 1 - Easy Level - 33 Givens - Step-by-Step Solution - By Web Sudoku

Step 0

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

Step 1

The number 5 does not yet appear in row A. Due to other 5s on the grid, the only place it can go is cell A9.
1 2 3 4 5 6 7 8 9
A   7 8       1   5
B 3   5 9       8  
C 2 9       5 6    
D   4 1   7        
E 9     1 3 8     4
F         4   8 5  
G     7 2       6 9
H   8       6 2   7
I     2       3 1  

Step 2

Because of the number 5 just placed, the only position in column 7 for another 5 is cell G7.
1 2 3 4 5 6 7 8 9
A   7 8       1   5
B 3   5 9       8  
C 2 9       5 6    
D   4 1   7        
E 9     1 3 8     4
F         4   8 5  
G     7 2     5 6 9
H   8       6 2   7
I     2       3 1  

Step 3

The number 9 does not yet appear in row A. Due to other 9s on the grid, the only place it can go is cell A8.
1 2 3 4 5 6 7 8 9
A   7 8       1 9 5
B 3   5 9       8  
C 2 9       5 6    
D   4 1   7        
E 9     1 3 8     4
F         4   8 5  
G     7 2     5 6 9
H   8       6 2   7
I     2       3 1  

Step 4

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

Step 5

Because of the number 9 just placed, the only position in row F for another 9 is cell F6.
1 2 3 4 5 6 7 8 9
A   7 8       1 9 5
B 3   5 9       8  
C 2 9       5 6    
D   4 1   7   9    
E 9     1 3 8     4
F         4 9 8 5  
G     7 2     5 6 9
H   8       6 2   7
I     2       3 1  

Step 6

The number 1 does not yet appear in row F. Due to other 1s on the grid, the only place it can go is cell F9.
1 2 3 4 5 6 7 8 9
A   7 8       1 9 5
B 3   5 9       8  
C 2 9       5 6    
D   4 1   7   9    
E 9     1 3 8     4
F         4 9 8 5 1
G     7 2     5 6 9
H   8       6 2   7
I     2       3 1  

Step 7

The number 8 does not yet appear in row D. Due to other 8s on the grid, the only place it can go is cell D1.
1 2 3 4 5 6 7 8 9
A   7 8       1 9 5
B 3   5 9       8  
C 2 9       5 6    
D 8 4 1   7   9    
E 9     1 3 8     4
F         4 9 8 5 1
G     7 2     5 6 9
H   8       6 2   7
I     2       3 1  

Step 8

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 F1.
1 2 3 4 5 6 7 8 9
A   7 8       1 9 5
B 3   5 9       8  
C 2 9       5 6    
D 8 4 1   7   9    
E 9     1 3 8     4
F 7       4 9 8 5 1
G     7 2     5 6 9
H   8       6 2   7
I     2       3 1  

Step 9

The number 9 does not yet appear in column 3. Due to other 9s on the grid, the only place it can go is cell H3.
1 2 3 4 5 6 7 8 9
A   7 8       1 9 5
B 3   5 9       8  
C 2 9       5 6    
D 8 4 1   7   9    
E 9     1 3 8     4
F 7       4 9 8 5 1
G     7 2     5 6 9
H   8 9     6 2   7
I     2       3 1  

Step 10

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

Step 11

The number 6 does not yet appear in column 9. Due to other 6s on the grid, the only place it can go is cell D9.
1 2 3 4 5 6 7 8 9
A   7 8       1 9 5
B 3   5 9       8  
C 2 9       5 6    
D 8 4 1   7   9   6
E 9     1 3 8     4
F 7       4 9 8 5 1
G     7 2     5 6 9
H   8 9     6 2   7
I     2   9   3 1  

Step 12

The number 8 does not yet appear in column 9. Due to other 8s on the grid, the only place it can go is cell I9.
1 2 3 4 5 6 7 8 9
A   7 8       1 9 5
B 3   5 9       8  
C 2 9       5 6    
D 8 4 1   7   9   6
E 9     1 3 8     4
F 7       4 9 8 5 1
G     7 2     5 6 9
H   8 9     6 2   7
I     2   9   3 1 8

Step 13

Because of the number 8 just placed, the only position in row G for another 8 is cell G5.
1 2 3 4 5 6 7 8 9
A   7 8       1 9 5
B 3   5 9       8  
C 2 9       5 6    
D 8 4 1   7   9   6
E 9     1 3 8     4
F 7       4 9 8 5 1
G     7 2 8   5 6 9
H   8 9     6 2   7
I     2   9   3 1 8

Step 14

Because of the number 8 just placed, the only position in column 4 for another 8 is cell C4.
1 2 3 4 5 6 7 8 9
A   7 8       1 9 5
B 3   5 9       8  
C 2 9   8   5 6    
D 8 4 1   7   9   6
E 9     1 3 8     4
F 7       4 9 8 5 1
G     7 2 8   5 6 9
H   8 9     6 2   7
I     2   9   3 1 8

Step 15

H8 is the last empty cell in box G7-I9 and the missing number is 4.
1 2 3 4 5 6 7 8 9
A   7 8       1 9 5
B 3   5 9       8  
C 2 9   8   5 6    
D 8 4 1   7   9   6
E 9     1 3 8     4
F 7       4 9 8 5 1
G     7 2 8   5 6 9
H   8 9     6 2 4 7
I     2   9   3 1 8

Step 16

Because of the number 4 just placed, the only position in column 7 for another 4 is cell B7.
1 2 3 4 5 6 7 8 9
A   7 8       1 9 5
B 3   5 9     4 8  
C 2 9   8   5 6    
D 8 4 1   7   9   6
E 9     1 3 8     4
F 7       4 9 8 5 1
G     7 2 8   5 6 9
H   8 9     6 2 4 7
I     2   9   3 1 8

Step 17

E7 is the last empty cell in column 7 and the missing number is 7.
1 2 3 4 5 6 7 8 9
A   7 8       1 9 5
B 3   5 9     4 8  
C 2 9   8   5 6    
D 8 4 1   7   9   6
E 9     1 3 8 7   4
F 7       4 9 8 5 1
G     7 2 8   5 6 9
H   8 9     6 2 4 7
I     2   9   3 1 8

Step 18

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

Step 19

Because of the number 7 just placed, the only position in row B for another 7 is cell B6.
1 2 3 4 5 6 7 8 9
A   7 8       1 9 5
B 3   5 9   7 4 8  
C 2 9   8   5 6 7  
D 8 4 1   7   9   6
E 9     1 3 8 7   4
F 7       4 9 8 5 1
G     7 2 8   5 6 9
H   8 9     6 2 4 7
I     2   9   3 1 8

Step 20

Because of the number 7 just placed, the only position in column 4 for another 7 is cell I4.
1 2 3 4 5 6 7 8 9
A   7 8       1 9 5
B 3   5 9   7 4 8  
C 2 9   8   5 6 7  
D 8 4 1   7   9   6
E 9     1 3 8 7   4
F 7       4 9 8 5 1
G     7 2 8   5 6 9
H   8 9     6 2 4 7
I     2 7 9   3 1 8

Step 21

The number 2 is missing from box A7-C9 and its only possible position is cell B9.
1 2 3 4 5 6 7 8 9
A   7 8       1 9 5
B 3   5 9   7 4 8 2
C 2 9   8   5 6 7  
D 8 4 1   7   9   6
E 9     1 3 8 7   4
F 7       4 9 8 5 1
G     7 2 8   5 6 9
H   8 9     6 2 4 7
I     2 7 9   3 1 8

Step 22

C9 is the last empty cell in box A7-C9 and the missing number is 3.
1 2 3 4 5 6 7 8 9
A   7 8       1 9 5
B 3   5 9   7 4 8 2
C 2 9   8   5 6 7 3
D 8 4 1   7   9   6
E 9     1 3 8 7   4
F 7       4 9 8 5 1
G     7 2 8   5 6 9
H   8 9     6 2 4 7
I     2 7 9   3 1 8

Step 23

Because of the number 3 just placed, the only position in column 8 for another 3 is cell D8.
1 2 3 4 5 6 7 8 9
A   7 8       1 9 5
B 3   5 9   7 4 8 2
C 2 9   8   5 6 7 3
D 8 4 1   7   9 3 6
E 9     1 3 8 7   4
F 7       4 9 8 5 1
G     7 2 8   5 6 9
H   8 9     6 2 4 7
I     2 7 9   3 1 8

Step 24

E8 is the last empty cell in box D7-F9 and the missing number is 2.
1 2 3 4 5 6 7 8 9
A   7 8       1 9 5
B 3   5 9   7 4 8 2
C 2 9   8   5 6 7 3
D 8 4 1   7   9 3 6
E 9     1 3 8 7 2 4
F 7       4 9 8 5 1
G     7 2 8   5 6 9
H   8 9     6 2 4 7
I     2 7 9   3 1 8

Step 25

The number 2 does not yet appear in column 2. Due to other 2s on the grid, the only place it can go is cell F2.
1 2 3 4 5 6 7 8 9
A   7 8       1 9 5
B 3   5 9   7 4 8 2
C 2 9   8   5 6 7 3
D 8 4 1   7   9 3 6
E 9     1 3 8 7 2 4
F 7 2     4 9 8 5 1
G     7 2 8   5 6 9
H   8 9     6 2 4 7
I     2 7 9   3 1 8

Step 26

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

Step 27

Because of the number 2 just placed, the only position in column 5 for another 2 is cell A5.
1 2 3 4 5 6 7 8 9
A   7 8   2   1 9 5
B 3   5 9   7 4 8 2
C 2 9   8   5 6 7 3
D 8 4 1   7 2 9 3 6
E 9     1 3 8 7 2 4
F 7 2     4 9 8 5 1
G     7 2 8   5 6 9
H   8 9     6 2 4 7
I     2 7 9   3 1 8

Step 28

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

Step 29

Because of the number 5 just placed, the only position in row E for another 5 is cell E2.
1 2 3 4 5 6 7 8 9
A   7 8   2   1 9 5
B 3   5 9   7 4 8 2
C 2 9   8   5 6 7 3
D 8 4 1 5 7 2 9 3 6
E 9 5   1 3 8 7 2 4
F 7 2     4 9 8 5 1
G     7 2 8   5 6 9
H   8 9     6 2 4 7
I     2 7 9   3 1 8

Step 30

Because of the number 5 just placed, the only position in column 5 for another 5 is cell H5.
1 2 3 4 5 6 7 8 9
A   7 8   2   1 9 5
B 3   5 9   7 4 8 2
C 2 9   8   5 6 7 3
D 8 4 1 5 7 2 9 3 6
E 9 5   1 3 8 7 2 4
F 7 2     4 9 8 5 1
G     7 2 8   5 6 9
H   8 9   5 6 2 4 7
I     2 7 9   3 1 8

Step 31

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

Step 32

F4 is the last empty cell in box D4-F6 and the missing number is 6.
1 2 3 4 5 6 7 8 9
A   7 8   2   1 9 5
B 3   5 9   7 4 8 2
C 2 9   8   5 6 7 3
D 8 4 1 5 7 2 9 3 6
E 9 5   1 3 8 7 2 4
F 7 2   6 4 9 8 5 1
G     7 2 8   5 6 9
H   8 9   5 6 2 4 7
I 5   2 7 9   3 1 8

Step 33

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

Step 34

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

Step 35

Because of the number 6 just placed, the only position in row A for another 6 is cell A1.
1 2 3 4 5 6 7 8 9
A 6 7 8   2   1 9 5
B 3   5 9 6 7 4 8 2
C 2 9   8   5 6 7 3
D 8 4 1 5 7 2 9 3 6
E 9 5 6 1 3 8 7 2 4
F 7 2   6 4 9 8 5 1
G     7 2 8   5 6 9
H   8 9   5 6 2 4 7
I 5   2 7 9   3 1 8

Step 36

Because of the number 6 just placed, the only position in column 2 for another 6 is cell I2.
1 2 3 4 5 6 7 8 9
A 6 7 8   2   1 9 5
B 3   5 9 6 7 4 8 2
C 2 9   8   5 6 7 3
D 8 4 1 5 7 2 9 3 6
E 9 5 6 1 3 8 7 2 4
F 7 2   6 4 9 8 5 1
G     7 2 8   5 6 9
H   8 9   5 6 2 4 7
I 5 6 2 7 9   3 1 8

Step 37

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

Step 38

Because of the number 3 just placed, the only position in column 2 for another 3 is cell G2.
1 2 3 4 5 6 7 8 9
A 6 7 8   2   1 9 5
B 3   5 9 6 7 4 8 2
C 2 9   8   5 6 7 3
D 8 4 1 5 7 2 9 3 6
E 9 5 6 1 3 8 7 2 4
F 7 2 3 6 4 9 8 5 1
G   3 7 2 8   5 6 9
H   8 9   5 6 2 4 7
I 5 6 2 7 9   3 1 8

Step 39

Because of the number 3 just placed, the only position in row H for another 3 is cell H4.
1 2 3 4 5 6 7 8 9
A 6 7 8   2   1 9 5
B 3   5 9 6 7 4 8 2
C 2 9   8   5 6 7 3
D 8 4 1 5 7 2 9 3 6
E 9 5 6 1 3 8 7 2 4
F 7 2 3 6 4 9 8 5 1
G   3 7 2 8   5 6 9
H   8 9 3 5 6 2 4 7
I 5 6 2 7 9   3 1 8

Step 40

Because of the number 3 just placed, the only position in column 6 for another 3 is cell A6.
1 2 3 4 5 6 7 8 9
A 6 7 8   2 3 1 9 5
B 3   5 9 6 7 4 8 2
C 2 9   8   5 6 7 3
D 8 4 1 5 7 2 9 3 6
E 9 5 6 1 3 8 7 2 4
F 7 2 3 6 4 9 8 5 1
G   3 7 2 8   5 6 9
H   8 9 3 5 6 2 4 7
I 5 6 2 7 9   3 1 8

Step 41

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

Step 42

Because of the number 4 just placed, the only position in row C for another 4 is cell C3.
1 2 3 4 5 6 7 8 9
A 6 7 8 4 2 3 1 9 5
B 3   5 9 6 7 4 8 2
C 2 9 4 8   5 6 7 3
D 8 4 1 5 7 2 9 3 6
E 9 5 6 1 3 8 7 2 4
F 7 2 3 6 4 9 8 5 1
G   3 7 2 8   5 6 9
H   8 9 3 5 6 2 4 7
I 5 6 2 7 9   3 1 8

Step 43

Because of the number 4 just placed, the only position in column 1 for another 4 is cell G1.
1 2 3 4 5 6 7 8 9
A 6 7 8 4 2 3 1 9 5
B 3   5 9 6 7 4 8 2
C 2 9 4 8   5 6 7 3
D 8 4 1 5 7 2 9 3 6
E 9 5 6 1 3 8 7 2 4
F 7 2 3 6 4 9 8 5 1
G 4 3 7 2 8   5 6 9
H   8 9 3 5 6 2 4 7
I 5 6 2 7 9   3 1 8

Step 44

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

Step 45

B2 is the last empty cell in box A1-C3 and the missing number is 1.
1 2 3 4 5 6 7 8 9
A 6 7 8 4 2 3 1 9 5
B 3 1 5 9 6 7 4 8 2
C 2 9 4 8   5 6 7 3
D 8 4 1 5 7 2 9 3 6
E 9 5 6 1 3 8 7 2 4
F 7 2 3 6 4 9 8 5 1
G 4 3 7 2 8   5 6 9
H   8 9 3 5 6 2 4 7
I 5 6 2 7 9 4 3 1 8

Step 46

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

Step 47

H1 is the last empty cell in column 1 and the missing number is 1.
1 2 3 4 5 6 7 8 9
A 6 7 8 4 2 3 1 9 5
B 3 1 5 9 6 7 4 8 2
C 2 9 4 8 1 5 6 7 3
D 8 4 1 5 7 2 9 3 6
E 9 5 6 1 3 8 7 2 4
F 7 2 3 6 4 9 8 5 1
G 4 3 7 2 8   5 6 9
H 1 8 9 3 5 6 2 4 7
I 5 6 2 7 9 4 3 1 8

Step 48

G6 is the last empty cell in row G and the missing number is 1.

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