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Unlimited weapons, energy, and shields:
Bonus lives:
Level skip:
Switch day and night:
Alter globe speed and direction:
Display alternate monitor frame:
Alternate ground appearance:
Debug mode:
Music select:
Alternate "Ammo depleted" notice:
Bonus missions:
Level 1
Level 2
Level 3
Level 4
Level 5
Hold Down + 3 + 4 + 6 + 7 at the mission selection screen. A sound will confirm correct code entry.
Hold 3 + 6 + 9 + # at the mission selection screen. A sound will confirm correct code entry. Up to nine extra lives may be selected.
Hold 2 + 4 + 6 + 7 + 8 + 9 at the mission selection screen. A sound will confirm correct code entry.
Hold Up + A + B + C + 7 during game play.
Hold 4 + 6 at the mission selection screen.
Press Right + C + 1 + 4 + 5 at the mission selection screen.
Hold Up + A + B + C + 3 during game play.
Press Up + A + B + C + 6 during game play. The top right number indicates the current frame rate.
Press Up + A + B + C + 0 during game play.
Press C + 4 + 8 at the mission selection screen.
Enter one of the following codes at the mission selection screen to enable the corresponding bonus mission.
Hold Up + 2 + 3 + 6.
Hold Down + 2 + 6 + 7 + 8.
Hold Right + 3 + 5 + 6.
Hold Up + 2 + 5 + 8.
Hold Right + 2 + 4 + 5 + 6.
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