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?

Sharpen your observation skills as you compare two seemingly identical images. Grab a magnifying glass, involve a buddy, and unleash your inner detective. Check the solution to see if you're a difference-detecting maestro!

Can you figure out the logic I used to decide the order of the following words:
gun, shoe, spree, door, hive, kicks, heaven, gate, line, den

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

What is harder to catch the faster you run?

When is the top of a mountain similar to a savings account?

A beggar on the street can make one cigarette out of every 6 cigarette butts he finds. After one whole day of searching and checking public ashtrays the beggar finds a total of 72 cigarette butts. How many cigarettes can he make and smoke from the butts he found?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

What has many keys but can’t open a single lock?

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?