"This is a variation of the classic Space Invaders style shoot-em-up. There are three levels in all. The first level has wave after wave of aliens scrolling down the screen at you. You must either shoot them or dodge them to stay alive. The second level is a bit like the mother-ship level in Phoenix. There are eight aliens inside the mother ship that you must destroy to clear the level. This is made difficult by the relentless attack of more diving aliens. The third level sees you flying your ship through an asteroid belt, doing all you can to avoid the asteroids until you come out safely on the other side. The game then goes back to level one and continues, just a lot faster."
[source: tomheroes.com]
Distribution : Retail - CommercialPlatform(s) : Commodore Vic 20
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