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ASO is a scrolling shooter with segregated weapons similar to Xevious. 
Missiles are used to destroy ground enemies, while laser-like weapons are used for aerial opponents. Throughout each of the levels, one or two players must fight off waves of enemies that threaten several space stations. A battle against a boss takes place at the end of each stage. The player's craft can be upgraded by collecting power-ups, as well as by collecting pieces of armor which can only be activated when the player collects enough energy.

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