Darius II is a 1989 Arcade video game by Taito. It is the direct sequel to Darius of the Darius Series, first released in arcades in 1989. The arcade version kept the same three-screen format as the first game. The power-up system changed slightly: to obtain power-ups, the player had to destroy complete waves of a particular enemy.
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Taking place immediately after the first game, Proco and Tiat succeeded in thwarting the Belser Army's campaign of destruction, but not without Darius itself still falling under their rule. However, the two aces led the Darius inhabitants to a substitute planet on the opposite side of Darius called planet Olga.
Once on Olga, the Darius inhabitants began to recuperate from their losses and lived in fear of Belser's reach. However, the space flight HQ established on Olga picked up an SOS signal coming from the portion of the Milky Way from where the first settlers of Darius originated. Suspecting that these might be other descendants of their ancestors, Darius's space alliance sends both Proco Jr. and Tiat Young to help.
Two new power-ups were added: a new weapon power-up which gives the player green, vertical lasers, and a rainbow-coloured item that powers up all the players weapons. The game is set in the inner half of the Solar system, and has the same branching level structure as Darius.
Another new feature in Darius II is the appearance of minibosses - large enemies that appear near the middle of a level, with similar abilities to the game's normal bosses (such as extravagant weapons, or the inability to be damaged without first exposing a vulnerable area). The minibosses in Darius II are in fact smaller versions of the bosses from Darius.
Darius II was ported to the Mega Drive/Genesis, Sega Master System in 1990, and was renamed Sagaia. It was later ported to the Sega Saturn in 1996.