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Sudoku is a logical puzzle game, originally created in puzzle books and then made available in countless newspapers worldwide. The grid is 9 cells high by 9 cells wide and within the grid are 9 boxes each featuring 9 cells. The object is to fill in the numbers 1-9 in each row, column and box, but they must only appear in each one once.Suitable for all players from beginners through to experts and six levels of difficulty, Astraware Sudoku is packed with features. There are several ways to get puzzles: from the pre-built puzzle packs available at http://www.sudokuoftheday.com; by using the integrated Puzzle Builder which creates literally billions of puzzles; or download any of the Puzzles of the Day* over the air and then compare your times with other players worldwide. Players can also play puzzles from newspapers or books they've entered and get Astraware Sudoku's expert help and assistance to solve them.Astraware Sudoku offers a range of different options to help players solve puzzles including manual or automatic pencilmarks in a choice of styles; a smart hints system; and the brand new hold and highlight system which can display an overlay for a specific number or pencilmark helping players to see where to look and what to look for. In touchscreen devices there's the added bonus of the notepad overlay, allowing players to make their own pencilmarks and notes on screen too.Following requests from existing users, Astraware Sudoku version 1.40 now includes an extensive Puzzle Manager which allows players to select a specific puzzle to play, or delete puzzles they've already completed.The game also offers a choice of control methods where players can move around and enter numbers using the 5-way, number keys, stylus and touchscreen, keyboard shortcuts, or any combination of these, so you can play it the way you want to.Easy-to-navigate menu system for finding and changing optionsFull tutorial introducing you to the basics of how to solve SudokuEnter your pencilmarks manually, or use the Auto pencilmark feature (optional at any time)Notepad overlay on touchscreen devices allows you to make your own notesBeautiful graphics and subtle effectsIntegrated Sudoku solver:Provides hints on what techniques to apply to find a number...rather than just giving you the answer!Can solve any "true" SudokuRates the difficulty of a Sudoku on more than just number of empty cells - takes into account the advanced Sudoku techniques needed to find a logical solutionSupports English, French, German, Italian, Brazilian Portuguese and Spanish!Native support for standard Smartphones (176x220), QVGA (240x320), and Landscape QVGA (320x240) Smartphones!Registering Astraware Sudoku gives access to additional features, including:Download new puzzle packs FREEDownload the latest puzzle of the day directly to your PDA *Upload your times from the puzzle of the day to compare your scores to other players! *Enter your own Sudoku, then solve them at your leisure!Built in puzzle generator with the following features:Generates puzzles of varying difficulty levels, from the simplest to diabolically difficultPuzzles generated at the higher difficulty levels require use of various advanced techniquesCreates "true" Sudoku (true Sudoku can be solved by logic alone by using the right techniques - no guessing required* Requires data connection or other connected networking capability. You may incur charges from your service provider for the transmission of data.