The main menu and three gameplay choices.
Classic gameplay is just like the old coin-op but with greatly enhanced graphics.
Defend the six cities with your three missile stations.
At the end of each classic level you score bonus points for each surviving city and unfired missile.
In ultimate mode, you play through a series of career missions around the world.
The ultimate mode missions take place in a full 3D environment.
The new battlefields are larger that the screen so you can try to intercept the incoming missiles way above the cities.
The core of the game is still protecting your cities but now, they come in various sizes.
Defending the larger cities is worth more at the end of each level.
Every few levels, you'll get to face off against a boss alien.
Ultimate missions will take you all around the world with new graphics in each region.
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