How big is the bird?
A deceptive brain teaser about profit sharing.
This puzzle is apparently used in job interviews — would you pass?
Number the dots so that each line of three adds up to 22.
Be the first to mark the corners of a square to win this game!
Here's one of our favourite strategy games.
Stretch your mind with this mess-free egg puzzle.
A logic teaser in honour of George Boole.
Exploring the five different notions of average.
Making a biased coin fair.
In how many ways can you make it up the stairs?
Making a very special number out of primes.