Sudoku - General Rules

Before we begin our quest, I am going to assume that everyone knows the four general Sudoku Rules. I will demonstrate these four rules below.

R1: Every row must have the numbers 1-9
R2: Every column must have the numbers 1-9
R3: Every box must have the numbers 1-9
R4: In each group of three columns or rows, each number appears in each row or column only once.


The following board demonstrates the four basic rules. (R4 is using the column rule)