All songs
Highlight Arcade mode and press Start. Then, highlight any of the difficult settings and press Right, Right, Right, Right, Right, Right.
Super mode
Press Up, Up, Down, Down, Left, Right, Left, Right at the title screen.
Change on-screen characters
Hold Left or Right, then press Start.
Change playing style
Hold X then press Start.
Right mode
At the song selection screen, press Select, Right, Right, Right, Right, Right, Right, Right, Right.
Left mode
At the song selection screen, press Select, Left, Left, Left, Left, Left, Left, Left, Left.
Shuffle mode
At the song selection screen, press Select, Up, Down, Left, Right, Down, Up, Right, Left.
Hidden mode
At the song selection screen, press Select, Up, Down, Up, Down, Up, Down, Up, Down.
Mirror mode
At the song selection screen, press Select, Left, Right, Left, Right, Left, Right, Left.
Little mode
At the song selection screen, press Select, Left, Down, Right, Down, Left, Down, Right, Down, Up.
Another mode
At the game mode selection screen, press Down, Down.
Maniac mode
Unlock Another mode, then press Down, Down at the game mode selection screen.
Return to normal mode
Unlock Another mode or Maniac mode. Then, press Up, Up at the game mode selection screen.