IQ tests present the readers with problems in the form of picture puzzles or math problems, and the reader needs to find the ...

Find one million consecutive positive numbers, none of which are prime.

You and a friend have arranged to meet at a popular downtown mall between 3 p.m. and 4 p.m. one afternoon. However, you neglected to specify a time within that one-hour window. Therefore, each of you ...

This puzzle asks you to spot who isn’t a real scientist—but it’s not as easy as it sounds. If you have strong deductive ...

Brain teasers are fun little puzzles that make you think in different ways. They might look simple at first, but they often ...