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Its my very favourite game, plus its very easy to complete it. Basically, all you have to is collect / use all the items as shown in "Various Items" section, and after that, you'll have to find Professor Eyestrain, which he will ask you six various items in order to create an Asteroid deflector as follows: 

 After you have given the six items that the Professor Eyestrain asked for, you'll see a rock bounced from the lever, and your score will be 2350 and that will be recorded as High Score.