Hidden codes for modifications
Codes are entered at "Select Music" screen. You will here a sound after entering the code and you will see a small icon on the screen side.
Code - Effect
DL, DR, DL, DR, DR, DL, DL, DR - 1,5x speed modifier
UL, DR, DL, U, UL, DR, D, D - 1,5x zoom
DL...