The following codes must be used at the PRESS START screen before the demo of the game starts rolling. You should hear a sound.

All Stages (Trial Mode)

Up, Down, Down, Right, Right, Right, Left, Left, Left, Left then hold Triangle and press Start.

One Shot Kills (Sudden Death Mode)

L2, R2, L2, R2, Circle, Triangle, Circle, Triangle, then hold L1 and press Start.

Max Ammo And All Guns (Max Power Mode)

L1, R2, L2, R2, L2, Triangle, Circle, Triangle, Circle, then hold L1 and press Start.

All Characters In Multi-Player Mode

Up, Down, Down, Right, Right, Left, Left, Left, Left then hold Circle and press Start.