Hidden mode option:
Select arcade mode, then choose any difficulty setting. Press the Analog-stick in any direction at the song selection screen, then press Up, Down, Up, Down, Up, Down, Up, Down.
Mirror mode option
Select arcade mode, then choose any difficulty setting. Press the Analog-stick in any direction at the song selection screen, then press Left, Right, Left, Right, Left, Right, Left, Right.
Little mode option
Select arcade mode, then choose any difficulty setting. Press the Analog-stick in any direction at the song selection screen, then press Left, Down, Right, Down, Left, Down, Right, Down, Up.
Left mode
Select arcade mode, then choose any difficulty setting. Press the Analog-stick in any direction at the song selection screen, then press Left(8)
Right mode
Select arcade mode, then choose any difficulty setting. Press the Analog-stick in any direction at the song selection screen, then press Right(8).
Shuffle mode
Select arcade mode, then choose any difficulty setting. Press the Analog-stick in any direction at the song selection screen, then press Up, Down, Left, Right, Down, Up, Right, Left.
