• Dark Hunter: After pressing start enter L1, L1, L1, R2.
• Ultimate Armour for X: After pressing start enter Left, Left, Left, Right.

To unlock the Ultimate Armor X, go to the title screen and press start. On the next screen, press LEFT, LEFT, LEFT, RIGHT. Then start the game to have this groovy new armor.

To unlock Nightmare Zero, press START at the title screen. At the next screen, press L1, L1, L1, R2. Then as you progress through the game and rescue Zero, you'll play as him, but in his Nightmare form.