| Character | How to Unlock
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| Baby Daisy | Use Wario's magnet to pull Daisy’s baby rattle from the fountain at Peach Garden. Then have Yoshi go through the manhole cover on the left side of the garden to find a crying baby. Give Baby Daisy the rattle.
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| Baby DK | Defeat DK's team
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| Baby DK | In the DK Jungle, use Yoshi’s power to free him from a palm tree he’s stuck in.
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| Baby Luigi | Do the levers in Mario's Stadium to connect the bridge to let him join you
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| Baby Mario | After Getting Baby Luigi, go to the field where you battle Bowser Jr.'s Team and save him
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| Baby Peach | Shes Hiding in a bush in Peaches Stadium
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| Birdo | Defeat Bowser Jr. at Yoshi Park to unlock Birdo.
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| Blooper | Have Princess Peach use her heart power on the bubbles in the water at the dock in Mario Stadium to unlock Blooper. Alternately, successfully complete all tutorials in Practice mode.
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| Blue Noki | Complete his task in Mario's Stadium
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| Blue Pianta | Get the key and save him. He is the one trapped in the shop, in Mario's stadium
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| Blue Shy Guy | Shoot the pirahna plants in Yoshi's Ballpark
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| Boo | Have DK and Wario solve the block puzzle at Wario City to unlock Boo.
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| Daisy | Complete Peach's Stadium
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| Funky Kong | In the DK Jungle, save him from the Hammer Brother.
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| Goomba | Help him trace his shop in Wario City
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| Gray Shy Guy | Have Peach get Gray Shy Guy out of the log at Yoshi Park to unlock him.
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| Green Koopa | In Wario City, free him from the poster.
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| Green Noki | Have Blue Noki in Team and Talk to him
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| Green Yoshi | Unlock Him At the manhole in Yoshi's ballpark
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| Green Shy Guy | Have Peach get Green Shy Guy out of the log at Yoshi Park to unlock him.
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| Green Toad | Successfully complete Toadette's puzzle, then search the bush at Peach's Stadium to unlock Green Toad.
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| King Boo | Talk to the Tiny Boos in a chest at Wario City to unlock King Boo.
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| King K. Rool | Head over to the DK Jungle and defeat all four Kritters. You can then go to the waterfall, defeat him, and he'll join.
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| Kritter | In the DK Jungle, defeat King K. Rool
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| Light Blue Yoshi | Rescue Light Blue Yoshi from Green Magikoopa in Yoshi Park to unlock him.
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| Monty Mole | Use Peach on the Monty outline on the beach at Mario Stadium to unlock Monty Mole.
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| Paragoomba | Use Yoshi's ground pound on one of the palm trees in Wario City to unlock Paragoomba.
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| Paratroopa | Defeat The minion guarding the lighthouse in Wario City
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| Peach | Complete Her Stadium
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| Pink Pianta | Go to Mario Stadium to find Pink Pinata in a palm tree on the beach to unlock Pink Pianta.
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| Red Noki | Have both others and talk to Him
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| Red Paratroopa | In Wario City, pain the giant billboard with a paintbrush found in Yoshi Park.
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| Red Shy Guy | Shoot the pirahna plants in Yoshi's Ballpark
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| Red Yoshi | Find his brush that he lost. Find him in Yoshi's Stadium
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| Tiny Kong | In the DK Jungle, defeat Bowser Jr.
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| Toad | He wil join you when you start Peaches stadium
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| Toadette | Talk to her in Peach's Stadium
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| Waluigi | Find Waluigi on top of a skyscraper in Wario City to unlock him.
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| Wiggler | Win a game at the toy field
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| Yellow Pianta | Go to Mario Stadium to find Yellow Pinata in a barrel and unlock him.
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| Yellow Yoshi | Use Yoshi to get Yellow Yoshi out of a tree at Yoshi Park to unlock Yellow Yoshi.
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| Unlockable | How to unlock
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| Brush | After you have beaten bowser jr at yoshis stadium, jump in the pipe as mario, fight yellow shy guy, then open the chest with wario.
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| Daisys cruiser pass | Found in the peaches ice garden item shop.
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| Fire ball error item | Found in the chest behind waluigi.
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| Luigis flashlight | Found in the mario stadium item shop (note, this will not be useful til after u beat bowser jrs team at bowser jrs playroom.
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| Mini boos | Mario and wario is needed - Go through the pipe on the pier as mario, then open the chest with wario after a battle with dry bones.
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| Pow block error item | Found in the chest blocked by baby dasit.
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| Rattle | Wario is needed - After you have talked to baby daisy, go bak to the fountain and search the right side with wario.
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| Secret shop pass | Found in the treasure chest behind brown kritter.
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| Toy field pass | Obtained after wiggler joins you.
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