Mario Power Tennis (GameCube)

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Alternate Yoshi's defensive power shot color

Win the Flower Cup tournaments in doubles mode.

Balloon Panic mini-game

Win the Flower Cup tournaments in singles mode.

Bowser court

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).