Unlock Guest Characters
These are all of the Guest characters you can encounter in this game. To unlock them, you must beat them in their respective sport after earning a medal in the Tournament Mode. Note that these characters aren't playable in any other sports:
Diddy Kong - Beat the Level 1 Rugby Sevens Tournament.
Dry Bowser - Beat the Level 2 Javelin Event.
Espio - Beat the Level 2 Triple Jump Event.
Jet - Beat the Level 1 Football Event.
Larry - Beat the Level 2 Equestrian Event.
Nabbit - Beat the Level 2 100 m Event.
Rosalina - Beat the Level 1 Rhythmic Gymnastics.
Rouge - Beat the Level 1 Beach Volleyball Event.
Sticks - Beat the Level 2 Archery Event.
Toad - Beat the Level 2 4x100m Relay Event.
Wave - Beat the Level 1 BMX Event.
Wendy - Beat the Level 2 Swimming Event.
Zavok - Beat the Level 1 Boxing Event.
Zazz - Beat the Level 1 Table Tennis Event.
Unlock Music Selection
To unlock the ability to choose your music for events, you must beat all Level 1 tournaments.
Unlock Game Modes
Not all of the game modes and content are available from the start. To unlock certain modes, you need to fulfill certain criteria. Princess Daisy gives you a hint about this when she talks about the sand sculpture that Chao and Toad were building. Tournament Mode is Mii only at first, but Mario and Sonic veterans will gradually start to join in at Level 2, and can eventually be unlocked for use at Level 3:
amiibo League - Get twenty five medals in any mode.
Carnival Challenge - Get twenty medals in any mode.
Heroes Showdown - Get three tournament medals OR get medals in all Single Match Events.
Item Stand: Mario Edition - Hold 250 coins in hand.
Item Stand: Rio Edition - Hold 50 coins/rings in hand.
Item Stand: Sonic Edition - Hold 250 rings in hand.
Music Selection - Beat all Level 1 Tournaments.
Play as any character in Tournament Mode - Beat all Level 3 Tournaments.
Tournament Mode - Play three Single Matches.