In CODEX Naturalis, you must continue the work of the illuminating monk Tybor Kwelein, assembling the pages of a manuscript that lists the living species in primary forests. Can you put the pages together in the best order possible? And are you prepared to sacrifice a species to develop your manuscript? In the game, each player starts with a single card on the table, a card that shows some combination of the four possible resources in the middle of the card, in the corners of the card, or both. Players also have two resource cards and one gold card in hand, while two of each type of card are visible on the table.