You will be given a random number at the start of the game.
There are four crystals below. By clicking on a crystal you will add a specific amount
of points to your local score.
You win the game by matching your total score to random number, you will lose the game if
your total score goes above the random number.
The value of each crystal is hidden from you until you click on it.
Each time when the game starts, the game will change the values of each crystal.
Your total score is: