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• Bonus bomb

Collect ten yellow stars. | [Sent by Neto]

• Bonus credits

Hold Right and repeatedly tap II when the helicopter is landing at the title screen. | [Sent by Neto]

• Guided missiles

Hold Select when collecting the yellow power-ups. | [Sent by Neto]

• Three extra helicopters

Immediately fly to the bottom left corner of the screen when game play begins. Drop a bomb when your ship can not move. A sound will confirm correct code entry.
 | [Sent by Neto]