This is a version of 'Space Invaders'. Alien ships have invaded your territory; your objective is to shoot them all down before they either reach your defences or destroy you.
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Choose the level of difficulty, then the quality, of the game. Move the mouse from side to side to control the ship; click to fire your laser. If you hit enemy ships then your score will increase. You get extra points for hitting the ones which fly alone across the screen. Avoid enemy fire, since this will deplete your energy. You have 3 lives.