As you probably know already, Sudoku is the latest rage that has taken the world of games by storm. Thousands of people the world over, chance upon Sudoku every day. And realize that they've discovered an enjoyable life-long hobby. As Sudoku is a rather new phenomenon, most people have a really hard time learning to solve these tricky puzzles. Now, some sites DO provide you with tips and formulas for solving Sudoku, but these are usually very complicated, I'm going to teach you how to solve EVERY possible Sudoku puzzle, even the most difficult one.

Aha! Gotcha is filled with very different types of puzzles than aha! Insight, which has many problems to solve. This book just presents many fun paradoxes that make you use your head, and while some of them are problems you have to take some time to solve, most are short paradoxical situations that you can think about for a short while and then go on the next page. It is easy to read, and Gardner again shows his skill in explaining interesting phenomena in a clear and interesting way. All the problems are good exercises on logical thinking and introduces various concepts of mathematics and statistics without seeming like you're studying.

The Math Mysteries series was designed to encourage students to think like math detectives, using clues to solve problems. These four different types of activities are found in each book: story-based mysteries, activities that discover the mysteries found in mathematics, rhyming riddles, and "crack-the-code" problems. All activities are identified in the table of contents with the NCTM standards. Activities integrate problem-solving with numbers and operations and can be used in a variety of ways. The forty engaging activities can be assigned individually, in pairs, as small group assignments...