There are 9 rows and 9 columns in a traditional Sudoku puzzle. Each row must contain the numbers one through nine.
without any duplicate numbers in any of the rows. There can not be any rows that have identical numbers in them
 

Sudoku Regions
In traditional sudoku rules a region is considered a 3x3 box and each puzzle consists of  9 different regions
Similar to rows and columns each region must also contain the numbers one through nine.
 

Sudoku Rules Summary

To play sudoku you must Complete the puzzle so that each row, every column, and region
only contains the numbers one through nine once.