Secret characters
Dry Bowser
The inksplosion level ends in the special ink showdown game
Baby Mario
1-3 ends in the special game Super Mario Tennis
Baby Peach
Rings levels end in the special play Shot game
Luma
The superstar level ends in the special game Galaxy Rally
Unlockable
Mario bee: Get the star for eight characters
Birdo: defeat an ACE opponent in Single exhibition match
BOO: Buy 100 different items
Bowser: Get 50 Victoria Medals in online multiplayer mode
Bowser JR.: Get 20 Victoria Medals in Multiplayer Mode online
Mario Cloud: Get the star for ten characters
Daisy: collects 700 ring points in the Ring Shot challenge with another player
Diddy Kong: Find 20 Mii characters
Donkey Kong: Find 50 Mii characters
Dry Bowser: Get 100 Victoria Medals in online multiplayer mode
Mario Fuego: Get the star for two characters
Goomba: Ańade 100 items to the store
Koopa Troopa: Cana 10 consecutive games
Luigi: Wins the Final Cup to Double Tournament
Luma: Get 1500 coins in the Galaxy Rally challenge
Mario: Win the Final Cup Tournament in Single
Peach: collects 800 ring points in the Ring Shot challenge
Petey Pirańa: Reach 50 returns in the ink showdown challenge
Mario pipe: Get star for five characters
Mario Tanooki: Get star for fifteen characters
TOAD: WIN 50.000 coins
Waluigi: Get 800 coins at Super Mario Tennis level 2-4
Wario: Get 800 coins at level 1-4 of Super Mario Tennis
Wiggler: Get 5000 points in the online multiplayer
Yoshi: use the QR code of the official Nintendo website.