There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

Readers with the eyes of a hunter can find the snake in the field. Can you? Test your puzzle-solving skills now!

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

What is the word or phrase below?
R | E | A | D

They are three errirs in this question. Can you find them?

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

If two's company, and three's a crowd, then whats four and five ?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?