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Usually, Flow Balls unlock Rhythm Games from the shop. It's possible to earn a Perfect in the unlockable Quiz minigame by intentionally getting the first practice question incorrect. This enables you to play drums with the song (the D-Pad, ABXY and LR buttons create different drum sounds.) To exit the player during this mode, you must press and hold L, R, and B at the same time for about three seconds.
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In the Café Museum, before selecting a song for the music player, hold L and R while pressing A. However, if you get a superb on all games (not including gatekeeper minigames or games you buy from the shop), as soon as a Perfect Challenge ends, you are given another immediately.
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Normally, Perfect Challenges are given randomly after a certain period of time.
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