You will be given a random number at the start of the game. This is your target score.
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 target score. You lose the game if your score exceeds the target score.
The value of each crystal is hidden from you until you click on it, and then you can determine the value by seeing how many points were added to your total score.
Each time the game starts, your target score and the values of the crystals will change! Click any crystal to start the game.