Hidden Mode 1
 
 Hold L + R (the two back keys on the Beat Mania controller) and press
 Start when the menu with the "Press Start Button" selection appears.
 Release those buttons and press Left + X (the two white keys on the
 left and right side). If you entered the code correctly, you will
 hear a sound. Then, the "Hidden Mode 1" option will now be available.
 
 Double play mode
 
 Hold Left + Square + X (the three white keys) and press Start when
 the menu with the "Press Start Button" selection appears. Release
 those buttons and press L + R (the two black keys). If you entered
 the code correctly, you will hear a sound. Then, an option for double
 play mode will now be available.