BYE-BYE BOXBOY!
Nintendo 3DS
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Unlock Qucy costume and Game Boy screen filter
The Qucy costume gives unlimited boxes and hints. Both are also unlocked by having BOXBOY! and BOXBOXBOY! save data on the system, or by clearing every stage perfectly, challenges included.
Sources: Nintendo Japan, StrategyWiki, Nintendo UK, NintenDaan (video)
Unlock a costume resembling this character
Kirby, Meta Knight, King Dedede and Waddle Dee each unlock their own costume. While it's worn, Qbby's boxes become Star Blocks.
Sources: Nintendo Japan, StrategyWiki (Costumes), NintenDaan (video), Nathaniel Bandy (video), StrategyWiki