The object is to accrue the most points during three rounds, which you do by spending your points to bid on sets of cards. Each turn the current player turns up one to three cards for all the players to bid on, with the highest bid taking all cards. The cards denote a commodity type and quantity/value. The round ends when each player's ships are full, or the commodity card deck is exhausted. After each round, points are awarded to each player having the most of a given commodity, and to the one with the most valuable total "cargo load".