Unlockables
Switch on the game and at the screen where it says 'Space Invaders Please Press Start', enter one of the following codes to unlock the corresponding effect.
Unlock Cheat Menu - Level Select and Permenent Shield:
B, A, Select, Select, B, A, Left, Left
Unlock Invincibility In Classic Mode:
Left, A, Select, Select, Up, Up
Unlock Maniacal Skill Level:
B, A, Down, B, A, Down, B, Up, Select
More tricks, tips and cheats for this game are right here - Space Invaders cheats
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