is a shoot 'em up in which the player is at the bottom of the screen, with an arrangement of aliens at the top. The player moves left and right to aim at an alien, then shoots a bullet up the screen, and the alien it hits is killed. The aliens are classed as Drones, Emissaries, Hornets and Commanders, with those higher up the screen scoring more points when destroyed. At set intervals an enemy will move down the screen towards you, escorting a bomber, which is a moment of high danger. Clear a wave and another is generated.
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Atari 2600 programmer Mark Ackerman
, at the time working in Atari's "think-tank" GCC
, was granted a patent for his technique invented for the 2600 port of Galaxian, allowing eight sprites to be displayed in one row.