Challenge your brain with this visual IQ test! Spot the odd number '308' hidden among the '303' series in just 7 seconds.

Challenge your brain with this tricky math puzzle! Test your IQ, boost your problem-solving skills, and see if you can solve ...

Word sequence puzzles constitute fascinating (and fun) experiments in associative thinking—that is, experiments in how we make semantic, conceptual, or formal connections among the words in a set.

Take these self-contained color sequencing puzzles with you on the go, or use them for skill-building fidget fun! ScramBoozle is for a single player, ages six and up. It retails for only $9.99!

Here’s a classic brainteaser that I don’t like. What’s the next number in this sequence: 1, 11, 21, 1211, 111221, …? The answer is 312211, because each number describes the digits in the ...