You can earn up to five stars on your save file through varying degrees of completion of the main story mode.
Stars | How to unlock
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1 star | Beat Bowser in story mode.
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2 stars | Unlock and beat every level outside of Superstar Road.
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3 stars | Get every star coin outside of Superstar Road.
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4 stars | Get every star coin in the first 8 levels of Superstar Road to unlock the last level.
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5 stars | Get every star coin in Superstar Road-9.
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