Match your mind with the world's greatest brains! If you can match minds with the greatest brains, then you have a chance of solving these puzzles. Try this one right now: A word I know, six letters it contains, subtract just one and twelve, you'll find, remains. If you can prove that six minus one equals twelve, you win the prize for smart thinking! If you miss it, or any others in this book, all the answers are at the back. Great cartoons and illustrations will help and entertain you, while your brain gets to work on these topnotch, trick challenges. More than 90 of the world's hardest puzzles start with super-hard puzzles and move up to out of this world hard. You'll love each and everyone!

FLEX YOUR brain power like never before! From acclaimed author Dr. Gary Gruber, whose proven critical-thinking methods have sold more than seven million books, this collection of mind-bending brain teasers is sure to challenge even the most experienced problem solver. Inside are logic puzzles, riddles, maddening math problems, mental games, and more! A ship is twice as old as the ship's boiler was when the ship was as old as the boiler is. The ratio of the boiler's age now to the ship's age now is what? What English word contains all the vowels, in alphabetical order? What is the three-digit number that can be made from the digits 2, 3, 5, and 7 where no two digits in the three-digit number are alike, and where the three-digit number is a multiple of each of the digits chosen? Stumped? Dr. Gruber reveals the fascinating explanations and detailed strategies for solving even the trickiest problems using his exclusive Gruber Method. DISCLAIMER: The brain teasers in this book may get you so wrapped up in critical thinking that you may not be able to do your regular work until you solve them! Any abrupt or gradual increase in creativity, intelligence, or motivation to get a better job suited to your newfound talents is strictly the reader's responsibility. For more than thirty years, Gary R. Gruber, PhD, has been recognized as a leading expert on the SAT, test-taking methods, and critical-thinking skills. His methods have been used by PBS, Sylvan Learning Centers, Grolier's Encyclopedia, and school districts throughout the country. Dr. Gruber's innovative problem-solving strategies make up the heart of the new MyMaxScore's online test prep (www.mymaxscore.com).

About the Book and AuthorPuzzle lovers, rejoice! Welcome, I have a challenge for you, Here is The World's Hardest Puzzle Book for you. You find in this book 100 harddest puzzles from 20 categories. All of which are our own design and production. All are unique, mixed, colorred illustrated, different figure, different size and easy rules and easy to understand and with two levels of difficulty. hard und very hard.Our mixed puzzles fun and very useful for all. This book is ideal gift for anyone who loves puzzlesAs a puzzle author, Mehmet Esabil Yurdakul, produces unique puzzles over a period of 20 years. He has published 13 books (9 paperbacks and 4 e-books) Now enjoy our puzzles !!!Mehmet Esabil Yurdakul Contact for Answers: [email protected]

If you're an experienced sudoku puzzle solver looking for a real challenge, then the World's Hardest Sudoku Book: 200 of the World's Toughest Sudoku Puzzles (Volume 2) is the book for you. This book features an additional 200 extremely hard sudoku puzzles that will test your skills and mental agility. These are not your average sudoku puzzles - they are designed to be a true test of your puzzle-solving abilities. Whether you're a seasoned sudoku samurai or just starting out on your puzzle-solving journey, this book is sure to provide you with hours of challenging, satisfying, and ultimately rewarding gameplay. With 200 hard sudoku puzzles to solve, this book will keep you entertained and engaged for hours on end. Are you up to the challenge?

This is not really a book. This is a building in the shape of a book...a maze. Each numbered page depicts a room in the maze. Tempted? Test your wits against mine. I guarantee that my maze will challenge you to think in ways you've never thought before. But beware. One wrong turn and you may never escape!

This book contains AI Escargot, the world famous sudoku puzzle which became the most difficult sudoku puzzle known in 2006. There are also several hints for solving AI Escargot in the shortest and most logical way. In addition, the book has 166 other sudoku puzzles in 11 categories. This makes it very convenient to find out your own level and to learn more! The author, Arto Inkala, is a puzzle creator and a doctor of science in the field of applied mathematics.