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THE RULES of Sudoku are simple:

Rule 1. Each line must contain the numbers 1 to 9.

Rule 2. No number can be repeated in the same line or column

Rule 3. No number can be repeated in the same 3x3 box.


Examples:
 
Rule 1: Each line must contain the numbers 1 to 9
 
1 2 3 10 12 3 4 8 7
2 7 4 6 9 0 8 5 3

This is wrong, because the numbers
10, 12 and 0 are used.
 

1 3 6 5 4 3 9 8 7
2 7 4 6 9 7 1 5 3

This is correct.


Rule 2: No number can be repeated in the same line or column
 
1 2 3 5 5 3 4 8 7
7 6 4 1 9 3 2 5 4

This is wrong, because the numbers 5
appear in the same row and number 3
appears twice in the same column.
 

1 2 3 5 5 3 4 8 7
7 6 4 1 9 3 2 5 4

This is correct.


Rule 3: No number can be repeated in the same 3x3 box.
 
1 2 3            
6 9 4            
5 8 2            

This is wrong, because the number 2
appears twice times in the same 3x3 box.
 

1 2 3            
6 9 4            
5 8 7            

This is correct.


NOTE:

In Super Sudoku 3x4 grids, numbers should be in the range 1-12

In Baby Sudoku 2x3 grids, numbers should be in the range 1-6





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