Enjoy the brand new puzzles in a new series - The Traveler's Companion. Compact books are convenient for use on planes, trains or buses to occupy the long hours of your trip. However, these books are not restricted to the purpose of travelling only. Grab the level that suits you best and enjoy these Classic SUDOKU puzzles at any time and for any occasion. Either you want - to exercise your brain to boost your focus and mental abilities, or - to prevent early memory loss and to lower the risk of Alzheimer's disease, and to keep your mind young for years to come, or - to relieve your stress and to relax after a hard day at work, or even - to prepare for the next World Sudoku Championship, or just - to kill a couple of hours on a plane then this book series is for you. HAPPY SOLVING!