Can you find the key in the picture below?

What kind of band never plays music?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

Can you count the number of squares in the given picture?

Do you know of a place where the wind blows south and then suddenly shifts direction towards the north?

Find the next number in the sequence

1, 2, 6, 21, 88, __?

Two friends Smith and Andrew were talking about the bravery of their families. Smith told great stories about his courageous grandfather who fought for Britain in "World War I". Andrew told that his grandfather was so brave that in 1919 just after the war he was honoured with a bravery medal with the words "For our Courageous Soldiers In World War I" embedded into it. Smith knows that his friend is lying. How?

There are three boxes which are labeled as Rs100, Rs150, and Rs200. One box contains two notes of Rs. 50. The second box contains one note of Rs50 and one note of Rs100 The third box contains two Rs. 100 notes. All boxes are labeled incorrectly.

What is the minimum number of boxes you must check in order to label all boxes correctly?

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?