You can play the puzzles in this book on your mobile phone! Wordoku or Alphabet Sudoku is played in the same way as Sudoku, except it uses letters instead of numbers. This book is ideal if you are a Wordoku expert. In this book, you find the most extreme Wordoku puzzle ever. Once you pick up this book, you won't be able to put it back down. You have been warned! Only 1 large print puzzle per page, with lots of white space for scribbling. Wordoku 9x9 - Extreme is a collection of 276 puzzle: 216 extreme Wordoku 9x9 puzzle 60 extra logic puzzle I guarantee that every logic puzzle in this Wordoku puzzle book has been carefully checked to ensure that each puzzle has only 1 solution. None of the puzzle in this book will appear in any of the other English PuzzleBooks.net books. Wordoku is also known as Wordoku, Alphabet Sudoku, Word Sudoku.