Part of CAVE's line of mobile bullet dodging tests. Released for DoJa and J2ME mobile devices, then re-released for Nintendo Switch. Based on the arcade game Ketsui: Kizuna Jigoku Tachi, it weaves the stages and bosses from the original into an endless boss rush. The farther a player gets, the harder the game becomes. Players are challenged to survive as long as possible while racking up a high score. Players are able to pick from the original game's ships.