You wil be give 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 making your total score to random number, you lose the game if you 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 vales of each crystal.