Sudoku is a game of elimination. If you know what you have, you know what you need. If you know what is impossible, you know what is possible. These are the things that make Sudoku such a fun game. In Sudoku there are 9 squares set in rows of three squares per row. There are also 9 columns that all have 9 squares. Each 'block' must have every number between 1 and 9. Each column must also have each number 1-9. The same goes for each row. Keep checking the numbers and eventually you'll get enough filled in to easily beat the game.