Get ready to fight with hoards of alien beasts as they mercilessly attack the Earth with all new weapons, character designs and attacks in brilliant new locations. It is your job not only to stop them, but to finish them off for good so that they can never return. If you need a breathtaking game that won't let you have a cup of coffee, which is already cold; if you long for the real war - then Star Defender 4 is for you! Your spaceship, which is controlled with the help of a mouse, can be moved along the lower line of the screen. The ship is armed with the primary and secondary guns. Left mouse button – shot from the primary gun, right mouse button - shot from the secondary gun. The primary gun reserve is unlimited. So you may use it as much as you want. The secondary gun reserve is limited and you are supposed to replenish it in the game process. Use different secondary gun types for more effective shooting. This will help you to kill more enemies and to get the highest percentage of the enemies killed.