Solving a Su-doku puzzle can be extremely tricky; however, the rules of the game are pretty simple. Su-doku is a grid of 9-by-9 squares made up of nine 3-by-3 regions. Some of the regions numbers are given. Solving a Su-doku puzzle does not require knowledge of mathematics. The goal is to fill in the empty square, so that each column, row, and region contains the numbers 1 through 9 exactly once.