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

Mr Red Lives in the red house.
Mr Green Lives in the greenhouse.
Mr Yellow Lives in the yellow house.

Who lives in the Whitehouse?

Count the number of triangles in the below picture?

Can you find out the remainder when 3^300 is divided by 5?

Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

Move four matchsticks to the below square to form three squares?

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?

We are a group of eight brothers. We consider the weak, yet we protect the king in every battle. If we move ahead, we never turn back. Who are we?

I look at you, you look at me I raise my right, you raise your left. What am I?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?