The object of the game is to remove pairs of cards that add up to the total of 13 from an arrangement of cards - a pyramid of 28 cards (kings are discarded as single card). Only cards that are exposed (i.e. no other cards are overlapping them) can be discarded. The draw pile is composed of 24 cards that can be exposed (one at a time) in the discard pile by clicking on the draw pile. The cards to be discarded can be both in the pyramid or one card in the pyramid and the exposed card in the discard pile.