From the publisher:

Accumulating sets is the aim of the game...

...it's holding onto them that's the trick! Sets are worth points, and highest score wins the game. Taking an opponent's set is easy, but beware: It's not what you take, it's what you keep that counts. With players matching and stealing sets faster than you can say "Ruckus," fortunes change quickly. Until the final card is played, it's anybody's game!