Little mode option
First select arcade mode, then choose any difficulty setting, press the Analog-stick in any direction, then press Left, Down, Right, Down, Left, Down, Right, Down, Up.
Hidden mode option
First select arcade mode, then choose any difficulty setting, press the Analog-stick in any direction, then press Up, Down, Up, Down, Up, Down, Up, Down.

Mirror mode option
First select arcade mode, then choose any difficulty setting, press the Analog-stick in any direction, then press Left, Right, Left, Right, Left, Right, Left, Right.

Extra game options
Hold B at the title screen, while selecting the arcade mode option. It will unlock following options:Vs., Single Play, Couple, and Double.

Character and arrow selection
First select arcade mode, then press the Analog-stick in any direction at the difficulty selection screen.

All songs
First select arcade mode, then highlight "Hard" at the difficulty selection screen, press Right, Right, Right. Now select the "Hard" option, and begin a game.