Sudoku is a game made up of a series of boxes and lines that must be solved in a certain pattern to win the game. Each line in the puzzle must be assigned a number 0-9, but each line can only use that number one time. Each line intersects with another line that also can only have that number used one time. Each area then creates a small box that can also only use those numbers one time per box. It gets very tricky. I suggest using a pencil with a large eraser when you start.
Sudoku has three rows of three boxes. Each of those nine boxes have nine littler boxes in them. You need to get the numbers one threw nine in each , square, row, and column with out a number repeating.