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?

A donkey is behind another donkey
I'm behind that second donkey
But there is a whole nation behind me

It is a murder you can describe in a word.

Count the number of balls in picture below:

What seven-letter word has hundreds of letters in it?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

What is the next number in this matchsticks series riddle?

What month of the year has 28 days?

Can you find the company name in the pictogram below?

The picture shows the dice results in each couple of throws. If they are actually following a pattern, can you find out the missing one?