How it works: Sudoku puzzles are formatted as a 9X9grid, broken down into nine 3X3boxes. To solve a sudoku, the numbers 1through 9must fill each row, column and box. Each number can appear only once in each row, column and box. You can figure out the order in which the number will appear by using the numeric clues already provided in the boxes. The more numbers you name, the easier it gets to solve the puzzle.