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

Super Bombliss, which is available as part of Tetris Forever, puts a unique spin on the Tetris formula, and it features ...

This brain teaser is designed to gauge your logical and analytical thinking abilities, but it also tests your ability to ...

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