Crystal Collector

You will be given a random number at the start of the game; this is your Target Number.

There are four crystals below; by clicking on a crystal you will add a specific amount of points to your Total Score, which starts at 0.

The objective of the game is to match your own Total Score to the random number; in doing so you win the game. You lose the game if your Total Score exceeds the random number.

The value of each crystal is hidden from you until you click on it, and with each new game the value of the crystals changes.

It's like Blackjack... just with a randomly changing target number.