After beating the game and viewing the credits, the Boss Tent will appear on World Star to the left of the other huts. The Boss Tent will allow you to replay any boss in the game, but with their patterns sped up to increase the difficulty. Defeating each boss will grant you between 1-2 Wonder Wools that can earn you new costumes.
Playing the special Poochy Dash bonus stages will allow you to unlock new costumes for the character. To change costumes, tap the Poochy icon at the bottom of the screen while in the Poochy Hut. (NOTE: To activate any Time Attack missions, you must scan the Poochy amiibo while in the Poochy Hut. You will not be able to play them otherwise.)
Collect all 40 Smiley Flowers in World 1.
Collect all 40 Smiley Flowers in World 2.
Collect all 40 Smiley Flowers in World 3.
Collect all 40 Smiley Flowers in World 4.
Collect all 40 Smiley Flowers in World 5.
Collect all 40 Smiley Flowers in World 6.
Collect all 270 Smiley Flowers across all worlds, including the previous "S" stages.
In addition to the costumes you earn just by playing the game, there are quite a number of costumes unlocked by scanning the correct amiibo figures. On the map screen, tap the amiibo icon in the lower left-hand corner and scan the correct amiibo to unlock the costume permanently in the "amiibo Hut". (NOTE: To unlock any of the Yoshi costumes, you must scan the corresponding Yoshi amiibo within the level to activate Double Yoshi Mode. When the level is completed, that Yoshi will be selectable in the amiibo Hut.)
| Unlockable | How to unlock
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| - Scan any amiibo that would otherwise be incompatible with the game (Pokemon, Chibi Robo, Shovel Knight)
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| - Scan the Bowser Jr. amiibo
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| - Scan any Bowser amiibo (Super, Smash, or Skylander)
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| - Scan the Captain Falcon amiibo
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| - Scan any Diddy Kong amiibo (Super or Smash)
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| - Scan any Donkey Kong amiibo (Super, Smash, or Skylander)
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| - Scan the Dr. Mario amiibo
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| - Scan the Duck Hunt amiibo
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| - Scan the Ganondorf amiibo
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| - Scan the alternate color Inkling Girl amiibo
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| - Scan the Inkling Boy amiibo
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| - Scan the Inkling Girl amiibo
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| - Scan the Inkling Squid amiibo
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| - Scan the K.K. Slider amiibo
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| - Scan any King Dedede amiibo (Kirby, Smash)
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| - Scan any Kirby amiibo (Kirby, Smash)
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| - Scan any Link amiibo (Smash, Ocaraina, 30th Anniversary)
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| - Scan the Little Mac amiibo
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| - Scan any Luigi amiibo (Super or Smash)
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| - Scan any Mario amiibo (Super, Silver, Gold, Smash, 30th Anniversary)
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| - Scan any Mega Man amiibo (Smash or Gold)
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| - Scan any Meta Knight amiibo (Kirby, Smash)
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| - Scan the Mii Brawler amiibo
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| - Scan the Mii Gunner amiibo
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| - Scan the Mii Swordfighter amiibo
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| - Scan the Mr. Game & Watch amiibo
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| - Scan the Mr. Resetti amiibo
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- Orange Inkling Squid Yoshi
| - Scan the alternate color Inkling Squid amiibo
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| - Scan any Peach amiibo (Super or Smash)
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| - Scan the alternate color Inkling Boy amiibo
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- R.O.B. Yoshi (Famicom Colors)
| - Scan the R.O.B. amiibo with the Famicom colorscheme
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- R.O.B. Yoshi (NES Colors)
| - Scan the R.O.B. amiibo with the NES colorscheme
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| - Scan any Rosalina amiibo (Super or Smash)
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| - Scan the Wario amiibo from the Super Smash Bros. series
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| - Scan the Sonic the Hedgehog amiibo
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| - Scan the Isabelle (Summer Outfit) amiibo
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| - Scan the Wario amiibo from the Super Mario series
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| - Scan the Timmy and Tommy Nook amiibo
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| - Scan any Toon Link amiibo (Smash, Wind Waker)
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| - Scan the Waddle Dee amiibo
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| - Scan the Wii Fit Trainer amiibo
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| - Scan the Isabelle (Winter Outfit) amiibo
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| - Scan the Wolf Link amiibo
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| - Scan the Blue Yarn Yoshi into the game while in a level
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| - Scan either Green Yarn Yoshi or Mega Yarn Yoshi while in a level
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| - Scan the Pink Yarn Yoshi into the game while in a level
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| - Scan any non-yarn Yoshi (Super or Smash) into the game while in a level
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| - Scan any Zelda amiibo (Smash, Toon Zelda)
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| - Scan the Zero Suit Samus amiibo
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