Puzzles

This section features a selection of classic puzzles and problems. Many are paradoxical in the sense that they are counterintuitive.

More puzzles are added regularly. Please BOOKMARK this site and visit again soon.

The famous 12 Balls problem.
A logic problem.
The Monty Hall Problem.
An infamous probability problem.
The Spider and the Fly
A counterintuitive problem in geodesics.
Bat and Ball Problem
Very simple problem (which most Harvard students get wrong).
Logic Problem
Very simple but only 4% of people get it right.
Grammar problem
Very simple.
The Liar Puzzle
How to avoid being eaten by cannibals.
Hungry Caterpillar Puzzle
Very Simple.
Guessing game
Win £5 CASH!
Two Children Puzzle
Another counterintuitive probability problem.
Bear Puzzle
A very simple lateral thinking problem.
Light Bulb Problem
Another lateral thinking problem.
Tower of Hanoi
Ancient mathematical problem with an interactive Java Applet.
The Rope Puzzle
Fun practical problem involving two people and a piece of rope or string.
Chess problem
For people who don't play chess.
Train puzzle
Very simple.
The F Test
How observant are you?
Two Simple Riddles
Brothers and sisters have I none...
The Rotating Coin Paradox
Conceptual problem which can be tested using two coins.