Additional details from the instruction booklet: OBJECT: To score points by launching a ship that cruises to a required number of ports which completes a cruise. Four may play as 2 partnerships, adding to the same cruises. Otherwise, they play as individual players. Contents: 2 decks of cards Pencil and paper are also required to play but are not provided. Card breakdown is as follows: Captain (16 cards) Sailor (16 cards) Port (16 cards) Ship (16 cards) Torpedo Run (4 cards) Torpedo (4 cards) Port Blockade (4 cards)