You will be given a random number at the start of a game.
There are four crystals below. By clicking on a crystal you will add a specific amount of points towards your total score.
You win the game by matching your total score to the random number. Youe lose the game if your score goes above the random number.
The value of each crystal is hidden from you until you chick on it.
Each time a new game starts the game resets the value of each crystal.