User:Muteki Buffalo/sandbox/Beatmania IIDX 4th Style

Beatmania IIDX 4th Style is the fifth game in the Beatmania IIDX series in the beatmania IIDX series of music video games. It was released in arcades by Konami in 2005. 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.