Three people enter a room and have a green or blue hat placed on their heads. They cannot see their own hat but can see the other hats.
The colour of each hat is purely random. They could all be green, blue, or any combination of green and blue.
They need to guess their own hat colour by writing it on a piece of paper, or they can write 'pass'.
They cannot communicate with each other in any way once the game starts. But they can have a strategy meeting before the game.
If at least one of them guesses correctly they win $10,000 each, but if anyone guesses incorrectly they all get nothing.
What is the best strategy?

You are given four tennis balls and asked to arrange those balls in a manner that the distance between each one of them is exactly equal. How will you do it?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

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

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Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

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Can you solve the photo plexer logic ?

Find the next number in the series.
1 10 24 43 67 ?