A Boat can be upgraded into a Ship for five stars, and a Ship can be upgraded into a Battleship for 15 stars once Navigation is researched. (The total cost of upgrading a Boat into a Battleship is 20 stars.) Upgrading a naval unit does not heal it.
Moving an upgraded naval unit onto land causes the unit to permanently lose its upgrade: if that unit is once again moved onto a Port, it will become a Boat.
- Before the "Power" update, which introduced Battleships, ships shot stones, like Catapults, instead of arrows.
|Land units: Warrior, Archer, Defender, Rider, Mind Bender, Swordman, Catapult, Knight, Giant, Nature Bunny|
Naval units: Boat, Ship, Battleship
Aquarion units: Amphibian, Tridention, Crab
∑∫ỹriȱŋ units: Polytaur, Navalon, Dragon Egg, Baby Dragon, Fire Dragon
Polaris units: Ice Archer, Mooni, Battle Sled, Ice Fortress, Gaami
Cymanti units: Hexapod, Kiton, Phychi, Raychi, Shaman, Exida, Doomux, Centipede
Removed units: Scout, Guard Tower