Win the Special Cup Fire tournament in singles mode.
Coin Collectors mini-game
Win the Mushroom Cup tournaments in singles mode.
Event Games
When you get to the main menu, push 'B' to go back to the 'Press start' screen, then hold 'Z' and then press 'Start' or 'A' and then Event games will be unlocked.
Flat shot
When charging up a shot, press A+B to do a really high shot.
Fly Guy
Win all three Normal Cup tournaments in singles mode.
Hana-Chan
Win the Special Cup Fire and Thunder tournaments in singles mode.
Hard Difficulty
To unlock the hardest difficulty level beat the 3 tournaments of the Star Cup.
Mario Bros. court
Win the Special Cup Thunder tournament in doubles mode.
Mecha Bowser Mayhem mini-game
Win the Mushroom Cup tournaments in singles mode.
Paratroopa
Win all three Normal Cup tournaments in doubles mode.
Petey Piranha
Win the Special Cup Fire and Thunder tournaments in doubles mode.
Star Cup
To unlock the Star Cup beat the 3 tournaments of the Normal Cup.
Star for character
Win all three Normal Cup tournaments with a character to unlock his or her star version.
Wiggler
Beat normal flower cup in doubles, to unlock Wiggler (Defense).