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first you have to install pygame with command "pip install pygame".
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if you encounter an blue destroy ship your score is increased by 1 points.
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if you encounter an red destroy ship your score is increased by 50 points and your battle ship is upgraded to golden battle ship.
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if you encounter an blue destroy ship with golden battle ship your score is increased by 3 points.
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red destroy ships appear less as compared to blue destroy ships
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sometimes you won't see any red battle ships