A mode unlocked when you have 5000000 points. You won't see the rings that shrinks to tell you when to hit the circles anymore, and the circles themselves disappear before you can hit them, it's much harder and requires you to pretty much know your songs inside out. The reward for this is you get 1.5x the points you would get in the difficulty you are playing in. So if you are playing in Elegant Ouen (Diva mode) and is aiming for an S for the last song, you can potentially score 99999999 with just that song.
Jam it back in, in the dark.
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