Big Sudoku Book with 650+ Puzzles Solving Sudoku is a lot of fun and very easy to learn. Have fun with this Sudoku book! You will find 650+ Puzzles to solve. Book features: 650+ Sudoku Very easy, easy, medium, hard, difficult Many hours of fun! Great gift for all new and "old" Sudoku fans! Click on "Buy Now" above and dive into the famous world of word search puzzles!