Image Fight/XMultiply

Level select (Image Fight):
Hold R1 + R2 + Start at the title screen.

Super weapon (Image Fight):
Press Start to pause game play, then press Square, Circle, Triangle, X.

Music test (Image Fight):
Press L2(3) at the options screen. Then, press L2 to select the music.

Level select (XMultiply):
Hold L1 + L2 + Start at the title screen.

Super weapon (XMultiply):
Press Start to pause game play, then press X, Triangle, Circle, Square.

Music test (XMultiply):
Press L2(2) at the options screen. Then, press L2 to select the music.