Every song:
Pick arcade mode, then highlight HARD at the difficulty selection screen. Press Right(3), select
the "Hard" option, and start playing your game.
Character and arrow selection:
Pick arcade mode, then press the Analog-stick
in any direction at the difficulty selection screen.
Additional game options:
Hold B while selecting the arcade mode option
at the title screen to unlock options for "Vs.", "Single
Play", "Couple", and "Double".
Hidden mode option:
Pick arcade mode, then select any difficulty.
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:
Pick arcade mode, then select any difficulty.
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:
Pick arcade mode, then select any difficulty.
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:
Pick arcade mode, then select any difficulty.
Press the Analog-stick in any direction at the song selection
screen, then press Left(8)
Right mode:
Pick arcade mode, then select any difficulty.
Press the Analog-stick in any direction at the song selection
screen, then press Right(8).
Shuffle mode:
Pick arcade mode, then select any difficulty.
Press the Analog-stick in any direction at the song selection
screen, then press Up, Down, Left, Right,
Down, Up, Right, Left.
Bonus track:
Enter the options menu and set "Ending" to
"Dreamcast". Then, get an "SS" rank on the
bonus ending song to unlock the Bonus track.