You will be given a number at the start of the game.
There are four crystals below. By clicking on a crystal you will add a specific amounts of points to your total score.
You win the game by matching your total score to the random number. You 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 value of each crystal.