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 score.
You win the game by matching your total score to the random number. You lose if your score goes over the number. Like blackjack.
The value of each crystal is hidden and only revealed by clicking on it.
Each time when the game starts the game will change the values of each crystal.