Ark Nova: Marine Worlds ExpansionMarine Worlds introduces sea animals into your zoo! To accommodate them, you need to build aquariums, a new kind of special 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 yourself a familiar, yet different game. Marine Worlds