Invincibility
At the main menu press: Up, Down, A, B, Left, Right, L, L, R, R, B, A.
Mission Select
At the main menu press: Up, Up, L, R, Down, Down, A, A, B, A.
Alien Ships in Tactical Database
To view all of the alien ships in the Tactical Database input the following sequence at the ''Press Start'' screen: R, L, A, A, A, B, Up, Left, Down, Right, Up, A. If done correctly, the screen will flash and a sound effect will be played.
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