Unlock weapons:
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To get a heavy blaster you must beat Slak Sagar on Alderaan and to
get a blaster rifle you must beat Sedriss on Tatooine.
Defeating the first Boss:
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You can easily defeat the first Boss by ground pounding and shooting
at him.
Speed Runs:
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Beating the game once allows you to play through the speed runs
(Rianna riding Zeeo to escape from a level) again on your own time.