During which month do people sleep the least?

The centre of the third figure is empty. What digit should fit inside?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

Before Mount Everest was discovered, what was the highest mountain in the world?

What is the relationship between these matchstick pictures below?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

A thief enters a store and threatens the clerk, forcing her to open the safe. The clerk says, “The code for the safe is different every day, and if you hurt me you’ll never get the code.” But the thief manages to guess the code on his own. How did he do it?

Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?

What can you serve, but never eat?