The object is to get rid of all the cards in your hand. The cards you are allowed to play must match the number, color, or be in sequence with the top card in the discard pile. When someone plays a 'Terrible 10' or 'Card Attack' card, someone will be pushing the button on the Card Attack machine. The machine is unpredictable: You may press the button a number of times and it won't fire, or it might fire after one hit. If the machine fires, it shoots cards at you and won't stop until you hit the button again. The cards go into your hand and play carries on this way until one person is out of cards. The winner is the person with the lowest score at the end of a predetermined number of rounds. - BoardGameGeek