Enter this code at the cheat menu:
Give me the maps
for all maps.
To select your own level in Arcade Mode (which you normally can't do), go to the Arcade Move character select screen and press Down and Left at the same time (then release), then press B and Start (then release also).
Feral Attack In Earlier Levels: FeralAttack
Infinite Feral Attacks: Bloodlust
Infinite Ammo: UnleashHell
Restore Health: ImJackCarver
Go to the Arcade Mode character selection screen and hold down Down (control pad), Left (control pad), A, and C, then release all four buttons at the same time and select your character to start with nine continues.