Enter one of the following codes at the mission selection screen to do one of the following bonus missions.
Code Effect Hold Up + 2 + 3 + 6 Bonus Level 1 Hold Down + 2 + 6 + 7 + 8 Bonus Level 2 Hold Right + 3 + 5 + 6 Bonus Level 3 Hold Up +2 + 5 + 8 Bonus Level 4 Hold Right + 2 + 4 + 5 + 6 Bonus Level 5
Enter the following codes at the mission selection screen. You should hear a sound if you entered the code correctly.
Code Effect Hold 3 + 6 + 9 + # Bonus lives Press Up or Down Change globe size Hold 4 + 6 Change globe speed and direction Hold 2 + 4 + 6 + 7 + 8 + 9 Level Skip Hold Down + 3 + 4 + 6 + 7 Unlimited weapons, shields, and energy
Enter the following codes during gameplay:
Code Effect Hold Up + A + B + C + 7 Change between Day and Night Hold Up + A + B + C + 6 Debug Mode Hold Up + A + B + C + 3 Vector graphics mode
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You can submit a problem report for any non-working or fake code in the lists above.