Beatmania IIDX 12: Happy Sky
Beatmania IIDX 12: Happy Sky (stylized as beatmania IIDX12: HAPPY SKY) is the 12th game in the beatmania IIDX series of music video games. It was released in arcades by Konami on December 22, 2004. The game features over 45 new songs, some of which are unlocked over Konami's e-Amusement platform. Happy Sky introduced several small but significant changes to the series, such as a new difficulty scale, and a new boss song.