Sudoku is a logic-based number placement puzzle . The objective is to fill a 9x9 grid so that each column, each row, and each of the nine 3x3 boxes (also called blocks or regions) contains the digits from 1 to 9, only one time each (that is, exclusively). The puzzle setter provides a partially completed grid. With SUDOKU 2010 you can create Unlimited and Solve Unlimited puzzles - SUDOKU has 7 levels of difficulty for you to master. Create and print up to 500 (at a time) puzzles if you prefer to do SUDOKU puzzles on paper in stead of on screen. Cant do a puzzle that is in the Newspaper? Use SUDOKU 2010 to help you solve it. This version is exclusive to CNET. Key Features: Create unlimited puzzles to solve; Seven Levels of Difficultly; Save Your Puzzles; Print a book of up to 500 puzzles at once, to solve when your traveling or just for fun at home (Creates different puzzles any time); Create a blank puzzle and enter numbers from a puzzle in the paper or another SUDOKU book and use the Hint & Solve facility to help you complete the puzzle if you are stuck. SUDOKU is completely free.