Brain Teasers

Have you ever wanted to be a detective or even a spy? During the American Revolution a group of spies played with invisible ink to send messages. Here is how to make your own invisible ink at...

Cryptology, or secret communication, has been around almost since writing began. Computers continue to use secret codes, called encryption, to protect against identity theft. Writing messages in...

This math trick has several variations. Below I will describe Version 1. The instructions may look daunting at first, but read them carefully and remember the basic math involved and practice the...

Love to solve problems and puzzles? Why not put your powers of deductive reasoning towards writing and selling logic puzzles. While this will not make you rich, it does provide a creative...

Hanjie is a Japanese logic puzzle that consists of a blank grid with sets of numbers across the top and side indicating the number of spaces filled in on those lines. The result is a pixelated...

We have all seen the claw game while walking around an arcade or amusement park. We have also probably all lost a good amount of money trying to win a prize from the claw game. So why does it look...

Whether you are a budding actor, a student or boning up for a big presentation, you may find a time when you must memorize a long text in a short amount of time. It may seem impossible, but...

If sitting on a stool and chatting up your bartender isn't entertaining enough for you, consider playing "Photo Hunt" during your next trip to your favorite tavern. Just look for the video...

Tongue twisters are challenging and fun for the whole family (except babies, of course!). But the toughest of the tough can be almost impossible to master. Here are some mind-boggling tongue...

Sudoku is a number puzzle that traveled from America to Japan, and now is popular worldwide. A number puzzle made of number puzzles, sudoku can keep you occupied for hours. Every puzzle can be...

Kakuro puzzles, the cousin of sudoku puzzles, are brain teasers that look like crossword puzzles but use numbers instead of words. Kakuro is as much about using number combinations as it is about...

The Monty Hall Dilemma is a mathematical brainteaser based on the former Let's Make a Deal TV show. There are three doors. Behind one is a car, and behind the other two are goats. You choose one...

Traditionally, guys in bars buy drinks for women. Many guys in bars are also trying to pick up those women, but by buying her a drink they run the risk of being just like every other guy, and not...

To complete 3D jigsaw puzzles, your experience as a puzzle builder must be at a fairly high level. While a standard table puzzle may take you 5 to 15 minutes to complete, a 3D puzzle may require...

Although best known as a mind-challenging Japanese import, sudoku was actually invented in 1979 by an American. Sudoku rules state that a number can only be used one time per column and row,...

If you ever shop for clothes made in another country, you’ll want to be able to convert metric units into non-metric units. America is just about alone in using the English system of measurement,...

Forget short-sheeting the bed. There are hundreds of ways to be much funnier.

Sherlock Holmes wasn't so smart; he just knew how to do his job well.

In "The Sign of the Four," Sherlock Holmes declares, "When you have eliminated the impossible, whatever remains, however improbable, must be the truth." Thus began the popularization of the logic...