Become a black belt in numbers with this awesome book of sudokus. The puzzles are graded by skill level, so work your way through the book until you reach master rank. With over 110 sudokus, it will keep you busy for hours! This book is perfect for puzzlers aged 7+.ABOUT THE SERIES: Arcturus Publishing''s Best Ever series brings together a wonderful array of puzzle books, activity books and joke books to keep children entertained for hours!