Ikaruga (斑鳩, lit. Japanese Grosbeak) is a shoot 'em up video game developed by Treasure. It was released in the arcades in 2001 on the Sega NAOMI, subsequently released on Dreamcast in Japan and then worldwide on the Nintendo GameCube, and was released on Xbox Live Arcade on April 9, 2008. It is a spiritual sequel to Radiant Silvergun. The gameplay consists of shooting enemies who come in one of two polarities: either black or white (sometimes called red or blue). The player's ship can be either polarity, and can be switched at will. Treasure previously experimented with colors and polarity in the Sega Saturn title Radiant Silvergun as well as Silhouette Mirage, released for both the Saturn and the PlayStation. Ikaruga was well received by critics.
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