DAIVA Story 6: Nirsartia no Gyokuza is the sixth game in the DAIVA saga. The story follows Mahtari Shuban, who must take resources from 15 hostile planets and defeat their inhabitants.
The game starts on a map screen showing where to find resources and other planets. Players can ignore enemy spaceships or engage in turn-based battles with them. During these battles, players choose where to place their fleet on a grid map, with the victor being whoever has remaining spaceships.
Players must also defeat enemy spaceships that attack the planets they possess. Before taking control of a planet, players enter an action game section in a mobile attack suit, navigating a side-scrolling level with obstacles and enemies.
In this section, players can deploy special items such as missiles, bombs, or shield refills to aid them. They must then shoot or avoid hostile enemies and defeat bosses to fully control the planet. The game offers four difficulty modes to choose from.