Do you want to improve your logic and problem-solving skill? If so, Sudoku is a smart choice for you It is fun, extremely addictive (you can't get your hands off it until you can solve it all ). You can play it anywhere and anytime, on the bus, train, lunch break or play it with your family on the dinner You don't have to be a math geek to be good at Sudoku Remember that a practice is all it requires. The newest version of SUDOKU Game: This MUST HAVE Brain Training version includes 500 Puzzles Hard Level for the Professional to get your idea around Sudoku. This book gives you a solid background for playing Sudoku, and is a great way to prepare you for the harder version. This book includes these awesome features: How to play Sudoku 500 Hard Level Sudoku Puzzles There is one and only solution for every puzzles (don't waste your time playing multiple solution Sudoku Full solution is included for every puzzles Carefully designed for Professional If you want to be a master in Sudoku, the next level Sudoku book recommended."