Radiant Silvergun (レイディアントシルバーガン Reidianto Shirubāgan) is a vertically scrolling shoot 'em up video game developed by Treasure. It was originally released on the ST-V arcade platform in 1998 and subsequently ported to the Sega Saturn later that year. The Saturn version features additional cutscenes by animation studio Gonzo. The title was later ported to the Xbox 360 via the Xbox Live Arcade service in 2011 with high-definition visuals and online co-op. Its spiritual sequel Ikaruga was released in 2001.