Ikaruga 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. An enhanced port has since been released on Steam on February 18, 2014, with Steam Achievements and Leaderboards support.
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 title Silhouette Mirage, released for both the Sega Saturn and the PlayStation. Ikaruga was well received by critics.
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