You are participating in a holiday gift exchange with a few classmates. You each write down your own name on a slip of paper and fold it up. Then all the students place their names into a single hat.

Some say the reason most manhole covers are round is that a circle cannot fall through a smaller circular hole. Which of ...

Brain teasers are excellent puzzle games for providing the brain with an effective mental workout. This math puzzle is a type ...

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Only highly intelligent readers can solve this math puzzle in 6 seconds. Test your IQ and problem-solving skills now!

Brain teaser puzzles test the reader's critical thinking and problem-solving skills by challenging them to solve a problem.

I like sudoku as much as anyone, but a change of pace might be nice occasionally. Enter Sweet 16, a new math puzzle game. As the name suggests it involves the numbers 1 through 16, and it's a bit like ...

Jigsaw puzzles are a fun way to pass the time, but they've remained relatively unchanged for decades. But Nervous System Studio has come up with something new by designing a brand new type of jigsaw ...

Marijn Heule turns mathematical statements into something like Sudoku puzzles, then has computers go to work on them. His ...