--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 total score.
--You win the game by matching your total score to the random number, you lose the game if your total score exceeds 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.