Marine Worlds introduces sea animals into your zoo! To accommodate them, you need to build aquariums, a new kind of enclosure. A new University allows you guaranteed access to 1 animal icon of your choice. For the 5 original action cards, there are now 4 alternate versions, each with small bonuses! Replace 2 of your action cards with alternate versions at the start of the game to give youself a familiar, yet different game. Marine Worlds includes new Zoo cards, Final Scoring cards, and Bonus tiles to mix with those from the base game. New wooden components for the Appeal, Conservation, and Reputation tracks and a set of wooden animals to use for supporting conservation projections make your game of Ark Nova come to life. Enhance your experience of Ark Nova with Marine Worlds! Ark Nova is required to play this expansion.