At the song selection screen press the following
Shuffle Mode
Select, Up, Down, Left, Right, Down, Up, Right, Left
Little Mode
Select, Left, Down, Right, Down, Left, Down, Right, Down, Up
Hidden Mode
Select, Up, Down, Up, Down, Up, Down, Up, Down
Mirror Mode
Select, Left, Right, Left, Right, Left, Right, Left, Right
Left Mode
Select, Left, Left, Left, Left, Left, Left, Left, Left
Right Mode
Select, Right, Right, Right, Right, Right, Right, Right, Right
At the title screen press Up, Up, Down, Down, Left, Right, Left, Right
Go to the options screen and set "Level" to "7"; "Max Stage" to "5" (for easy), "3" (for normal), or "1" (for hard); "Time limit" to "On"; and "Game Over" to "2nd Remix". press Right, Left, Right, Left, Down(2), Up(2) at the title screen. Then, press Select at the menu. This mode allows you to paint your own arrows.
At the game mode select screen press Down, Down
After getting Another mode (See above) press Down, Down at the title screen
After doing Another Mode or Maniac Mode you can press Up, Up at the game mode select screen
Hold X then press Start to change
First hold Left then press Start. (Alternatively hold Right)
After highlighting the Arcade mode option press Start then highlight any of the difficulty settings and press Right six times