Unlock Characters
Luma - Complete the Superstar level of the Galaxy Rally Special Game.
Baby Mario - Complete 1-3 in the Super Mario Tennis Special Game.
Baby Peach - Complete the Pro Rings level of the Ring Shot Special Game.
Star Character - Beat the Champions Cup as a given character.
Dry Bowser - Complete the Inksplosion level of the Ink Showdown Special Game.
Unlock Costumes
Fire Mario - Turn 2 characters into star characters.
Unlock Courts
Galaxy Arena Morph Court - Complete the Final Cup in the Star Open tournaments.
Galaxy Arena Crystal Court - Complete the Final Cup in the Star Open tournaments.
Unlock CPU Difficulties
Ace difficulty - Beat the Final Cup tournament.
Pro difficulty - Beat the Champions Cup tournament.
Unlock Tournaments
1-Up Mushroom Cup - Beat all four cups of the World Open.
Final Cup - Beat the Shell Cup tournament.
Flower Cup - Beat the Mushroom Cup tournament.
Banana Cup - Beat the Flower Cup tournament.
Champions Cup - Beat the Banana Cup tournament.
Ice Flower Cup - Beat the 1-Up Mushroom Cup tournament.
Shell Cup - Beat the Ice Flower Cup tournament.