I've been playing DDR Supernova 2 for the PS2 for months now. I have gotten B's and A's on almost every song I have unlocked on Expert difficulty, but I still am not able to select Expert difficulty when first starting a session. I hit a wall in in the Master Mode, and can't beat any more levels beyond around level J.
Will I be able to unlock Expert mode just by playing songs in the normal mode of playing, or do I have to beat things in Master Mode or Battle Mode?