Laser Invasion (NES)

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Unlock Nine Fighters

Highlight 'Players 3' on the option screen. Press [Right] x 3, [A] x 3, [Right] x 3, [A] x 3. Then, press [Right, A] x 18. Finally, press [Right] x 3.

A sound and the appearance of the number 9 next to 'Players' will confirm correct code entry.