"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." When 2D puzzles are no longer exciting, 3D brain teasers are the way. These handheld puzzles require ...

Math Puzzle: In this math puzzle, the final number is missing. Do you have the most intelligent brain that can solve the math puzzle in 11 seconds? Test your math skills now! Math puzzles are a good ...

A geometry puzzle first posed in 1966 has baffled mathematicians for decades. Known as the moving sofa problem, it asks for ...

An amusing parlor trick is performed as follows. Ask spectator A to jot down any three-digit number and then to repeat the digits in the same order to make a six-digit number (e.g., 394,394). With ...

If the cards shown here are rearranged to form four new poker hands of five cards each, what is the lowest possible winning or tying hand? When two hands are of the same type, such as a pair or a ...