Some of the units available to the player are characters in the game's storyline, while the rest are monsters which can be summoned by the player. Resources, divided into berries and minerals, are gathered from resource nodes by Rabite units. Minerals are used to create buildings, while berries are used to create units from those buildings. Both buildings and units are built inside of the player's airship, and units are then dropped onto the battlefield by the movable ship. The game features some role-playing elements; characters during the course of the game learn new skills over time, and can be given equipment to increase their attack and defense. New equipment is obtained through completing story and bonus missions and finding hidden treasure. During the course of the game's story the player also acquires new summons and heroes. Missions can have different ending conditions, such as destroying an enemy carrier or defeating all enemies in the area. There are over 20 missions in the game's story, as well as dozens of bonus missions which become available as the player advances through the game which do not advance the plot but can give the player more items and summons.