Let me give you an explanation about inner maps on Wii2.
Kantan, Futsuu, and Muzukashii will ALWAYS have this Tatsujin map thing. As you may notice, Tatsujin difficulty = 1 difficulty higher on the regular map. This means Angel Dream (Ura) on Muzukashii Tatsujin = Angel Dream on Oni.
Of course, there are exceptions. One is the Bachi Osensei song, it is a longer version. The other is Rotter Tarmination, it is basically a big note version of the same difficulty (not 1 above).
Also, getting 200 crowns unlocks Senpuu no Mai (now you know where that 9-star song came from!), and 300 playcount unlocks Hayasaitama 2000.
Kantan, Futsuu, and Muzukashii will ALWAYS have this Tatsujin map thing. As you may notice, Tatsujin difficulty = 1 difficulty higher on the regular map. This means Angel Dream (Ura) on Muzukashii Tatsujin = Angel Dream on Oni.
Of course, there are exceptions. One is the Bachi Osensei song, it is a longer version. The other is Rotter Tarmination, it is basically a big note version of the same difficulty (not 1 above).
Also, getting 200 crowns unlocks Senpuu no Mai (now you know where that 9-star song came from!), and 300 playcount unlocks Hayasaitama 2000.