Click on the gems to try and hit the target score. Each has a different value from 1-12 and the values change each round.

You win the round by matching your total score to the target score, randomly generated each round from 20-120, and you lose the round if your total score goes above the target.

You won't know the value of each gem each round until you click on it and you'll have to remember the value thru the round.