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• Invincibility

Hold Down/ Left + I + II and press Run. Alternatively, hold Down + Select before the stage text appears. Release the buttons when your ship stops flashing to be invincible while your weapons are at level one. | [Sent by Neto]

• Level select

Press Select at the title screen to enter the options menu. Highlight the "Exit" option, then press Down, II, II, Left, I, Right, Select. A sound and red background letters will confirm correct code entry. | [Sent by Neto]