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Star Defender is an arcade game like Defender and Stargate. It offers a large number of moving shapes, fast accelerated scrolling and digi sounds. The object of the game is to protect humanoids on various number of moons from alien attack waves.
Your ship is equipped with the latest engines, offensive weapons and defense systems. The engines enable your ship to fast acceleration and auto reverse. The quickfire laser, which is the main offensive weapon, has great power and is capable of fast recharging. Additionally, your ship can fire smartbombs (2nd button on your joystick or space bar), which will destroy all enemies on the screen. Smartbombs are limited, so use them with care! Finally you can use the scanner, which shows all enemies on the moon.
The enemies are attacking in waves, which are limited to each moon. If you succeed in defending the humanoids from all attack waves, you will be send to the next moon, otherwise the moon detonates and you have to reject the remaining attack waves.