Activision Angry Birds Star Wars - Manual (Page 12)

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Earning Stars:
Stars are earned by obtaining high scores for each level. More points
are awarded for completing a level with the least amount of birds and
with the most amount of object destruction.
Millennium Falcon:
The Millennium Falcon can be called in to clear a level at any time, but
it has a limited number of uses. More Millennium Falcons can be unlocked
by achieving stars during gameplay, playing the game for consecutive days,
playing local multiplayer, failing a level too many times, or by finding some
secrets in the main menu.
Golden Droids:
Find golden droids (eggs) hidden in the levels throughout
the game to unlock secret bonus levels!