You will be given a target number at the start of your 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 target number. You lose the game if your total score goes above the target 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.