Classic Sudoku puzzles always use the same symbols to fill in cells: the digits 1-9.
In Word Sudoku, however, each puzzle has a "different" set of symbols-the letters in a word or phrase. The puzzles are a little bit harder than classic Sudoku because you have to learn the allowable symbols all over again each time you begin a new puzzle.
This book takes this idea three steps further.
First, you don't get the actual word or phrase. You get an "anagram" instead-a phrase that's a rearrangement of the letters of the hidden word or phrase. (For example, "English" and "shingle" are anagrams of each other.) You unveil the hidden word or phrase as you solve the puzzle.
Second, every puzzle anagram in this book shares three letters: "ABC." Since you know this, these three letters are missing from each puzzle anagram.
Third, you don't get just 9x9-size puzzles. You'll solve 88 puzzles in five different sizes, from easy 6x6, to the expected 9x9... to devilish 12x12.