Play a game on the expert setting and beat Earth. After beating Earth you will go to Mercury. Beat Mercury to go to the Alien Homeworld.
Play in Mercury
Play the game on the expert setting and after you defeat the Earth Boss you will be sent to Mercury.
Un-lock Maniacle Mode
Beat the game on the expert setting.
Unlock Classic Mode
Beat the game under Normal difficulty and Classic Mode will appear at the main menu.
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Space Invaders Cheats from Cheat Genius
