Unlockables
During gameplay quickly enter the following codes to unlock the corresponding effect. If the code has been entered correctly you will hear a confirmation sound.
Unlock Invincibility:
Press L1, R1, L1, R1, Up, Down, Left, Right.
Unlock Infinite Weapons:
Press L1, R1, L1, R1, Up, Down, Left, Down.
Unlock Quadruple Weapon Damage:
Press R1, R2, R1, R2, Up, Down, Up, Down.
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