How do you get 5 stars for your file (when at data selection on bottom screen)
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You have to collect every badge, which means clearing all missions in story mode, setting every record and winning on all events and medleys. To create custom medleys with high stars levels, you need to put together your best events, The rank of your events is displayed on the top screen when in medley make mode. You may need to practice your favourite events over and over to make their rank higher. Remember that you can't mix solo, 2P and 4P events, which is a pain because my best events are a mixture.
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