To solve these inventive brainteasers, your brain has to be in tip-top shape. Warm up with some (slightly) easier puzzles: beginning in the left corner of a box with grids, try to reach the bottom right square. You may pass only through the left and right sides of small squares, but not through their top or bottom. And you can't go through the black squares at all. Another challenge involves four dice, all stacked up. Can you find a pattern that lets you figure out how many pips are on the base side? Arrange the "magical dominoes" precisely and mathematically; do the equations to figure out how. There are also unusual card tricks, "cut-it" puzzles that involve reconstructing figures that have been broken up, and three-dimensional conundrums. As you work each one out, you'll feel yourself getting smarter every minute.

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).

Give your brain a workout on the type of brainteasers that challenge the best solvers at the World Puzzle Championships. They're tough, but fun, and the feeling of satisfaction you get when you succeed is simply unbeatable. Some of the puzzles are oldies but goodies, like battleships--and its many variants--where you search for a fleet hidden within a grid. In "Eminent Domain," try to determine which blanks cells are owned by the numbered ones. For "Hex Loops," locate a path that travels through adjacent hexagons: the trick is, it has to end where it started, and the lines can't touch or cross. From Snaky Tiles to Spiral Galaxies, these Mensa-level conundrums will get your mind in shape.

Puzzle these out! Math and logic become more fun than ever when they're turned into brainteasing games. Some of these puzzles use cards or marbles; others have diagrams, grids, and lively illustrations; still more present their questions as a story or riddle. Here are just two examples: Look at this sentence: Dale is wrong. Using all these letters, can you spell a single word? Or try Non-aligned Pawns: How must the 8 white and 8 black pawns in a chess set be placed on a board so that no three pawns end up in the same horizontal, vertical, or diagonal line? They'll really test your smarts!

It's like having a personal trainer for your brain!This huge book of brain teaser puzzles for kids is perfect for ages 9 - 12 and up. Included are long time family favorite mind teasers such as hidden pictures, cryptograms, math squares, logic grid puzzles, picross and matchsticks. Also included are cool Japanese puzzles like sudoku, maysu, slitherlink, and numberlink. Brain teasers can:Boost brain powerImprove concentrationDevelop short term memory competencyCultivate problem solving skillsPromote critical thinking abilitiesEnjoy this children's puzzle book on school breaks, while you travel, or any day you need some screen-free fun mental exercise!

Fully illustrated in color, this treasure trove features 250 puzzles on every imaginable theme and subject. The book is a bonanza of mazes, word games, visual and logic puzzles, and more.

So You Think You're Smart is an eclectic collection of word games, riddles and logic puzzles to tantalize, tease and boggle the brains of readers of all ages and educational levels. The brain teasers are about ordinary words and things that everybody knows about so only common sense and a bit of resourcefulness are needed to solve them. The book is in its 17th printing and has appeared on Saturday Night Live.