Note: This game is also titled Super Mario Stadium: Family Baseball.
Successfully complete the indicated task in Challenge mode to unlock the corresponding field.
Successfully complete the indicated task to unlock the corresponding character. Note: There are multiple ways a specific character can be unlocked.
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 to unlock Baby Daisy.
Use Yoshi's power at DK Jungle to free Baby DK from the palm tree to unlock Baby DK. Alternately, defeat DK's team.
Pull the levers in Mario's Stadium to connect the bridge to unlock Baby Luigi.
Unlock Baby Luigi, then save Baby Mario at the field where you battle Bowser Jr.'s team to unlock Baby Mario.
Use Princess Peach's heart power on the grass Toad statue at Peach Garden to unlock Baby Peach.
Defeat Bowser Jr. at Yoshi Park to unlock Birdo.
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.
Successfully complete Blue Noki's task at Mario's Stadium to unlock Blue Noki.
Get the key, and save Blue Pianta from the shop at Mario's Stadium to unlock Blue Pianta.
Shoot the Piranha Plants at Yoshi's Ballpark to unlock Blue Shy Guy.
Have DK and Wario solve the block puzzle at Wario City to unlock Boo.
Successfully complete Peach's Stadium to unlock Daisy.
Save Funky Kong from the Hammer Brother at DK Jungle to unlock Funky Kong.
Help Goomba trace his shop at Wario City to unlock Goomba.
Have Peach get Gray Shy Guy out of the log at Yoshi Park to unlock him.
Free Green Koopa from the poster at Wario City to unlock Green Koopa.
Unlock and have Blue Noki on your team, then talk to Green Noki at the beach at Mario's Stadium to unlock Green Noki.
Have Peach get Green Shy Guy out of the log at Yoshi Park to unlock him.
Successfully complete Toadette's puzzle, then search the bush at Peach's Stadium to unlock Green Toad.
Free Green Yoshi at the manhole at Yoshi's ballpark to unlock Green Yoshi.
Talk to the Tiny Boos in a chest at Wario City to unlock King Boo.
Defeat all four Kritters at DK Jungle. Then, go to the waterfall, and defeat King K. Rool to unlock King K. Rool.
Defeat King K. Rool at DK Jungle to unlock Kritter.
Rescue Light Blue Yoshi from Green Magikoopa in Yoshi Park to unlock him.
Use Peach on the Monty outline on the beach at Mario Stadium to unlock Monty Mole.
Use Yoshi's ground pound on one of the palm trees in Wario City to unlock Paragoomba.
Defeat the minion guarding the lighthouse at Wario City to unlock Paratroopa.
Successfully complete Peach's Stadium to unlock Peach.
Go to Mario Stadium to find Pink Pinata in a palm tree on the beach to unlock Pink Pianta.
Unlock and have Blue Noki and Green Noki on your team, then talk to Red Noki on the giant clam at Mario's Stadium to unlock Red Noki.
Find the paintbrush at Yoshi Park, then use it to paint the giant billboard at Wario City to unlock Red Paratroopa.
Shoot the Piranha Plants at Yoshi's Ballpark to unlock Red Shy Guy.
Find the brush that Red Yoshi lost, then find him at Yoshi's Stadium to unlock Red Yoshi.
Defeat Bowser Jr. at DK Jungle to unlock Tiny Kong.
Start Peach's Stadium to unlock Toad.
Talk to Toadette at Peach's Stadium to unlock her.
Find Waluigi on top of a skyscraper in Wario City to unlock him.
Reset the roller coaster that Wiggler is riding at Yoshi Park to unlock Wiggler. Alternately, win a game at Toy Field.
Go to Mario Stadium to find Yellow Pinata in a barrel and unlock him.
Use Yoshi to get Yellow Yoshi out of a tree at Yoshi Park to unlock Yellow Yoshi.
Locate the Secret Shop, then successfully complete the indicated task to unlock the corresponding item:
Unlock Wario, then use his treasure opening ability at the listed locations in Challenge mode to find the corresponding Error items:
Successfully complete the indicated task to unlock the corresponding badge:
Win at Bowser Jr.'s Playroom in Challenge mode to unlock the ability to play during the day or night at all stadiums except Bowser's Stadium and Luigi's Mansion.
Successfully complete all mini-games on the Star difficulty to unlock Minigame Madness. Note: This cannot be done in Challenge mode.
Defeat Bowser two times to unlock the last movie.
The following teams are made up of the indicated players: