Solving a Su-doku puzzle can be very tricky; however, the rules of the game are nice elementary. Su-doku is a grid of 9-by-9 blocks made up of 9 3-by-3 regions. Some of the regions numbers are given. Solving a Su-doku puzzle doesn't require knowledge of mathematics. The aim is to fill in the empty block, so that every column, row, and region contains the numbers 1 through 9 exactly once.