Each game consists of a number of rounds. The first play to win four rounds wins the game. Each time you win a round you get less balls for the next round. This keeps the game very challenging. You always get the first shot and that is usually and advantage if played well. You get extra points for knocking out more than one ball at a time. You get points for every ball you have left of the table at the end of a round.
The games are pretty short, but Shuffle is one of those games that you always just want to play one more time and before you know it an hour or two has passed and you still want to play just one more time.