At the title screen, hold L and R and press Up, Down, Right, Left, X, B, Y, Y to unlock all characters, skins, voice packs, and music. If you entered the code correctly, you will hear a sound.Win counter in Multiplayer mode
At the title screen, hold ZL and R and press Down, X, Y to enable the win counter in Multiplayer mode. If you entered the code correctly, you will hear a sound.Maximum difficulty in VS mode
At the character selection screen, hold L and press Y before selecting a CPU player to unlock the maximum difficulty in VS mode.