Sega Superstars Tennis Cheats - Nintendo DS
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Unlock Extra Characters
Amy - Beat the bronze tournament in Singles.
Gum - Beat the silver tournament in Doubles.
MeeMee - Beat the silver tournament in Singles.
Pudding - Beat the gold tournament in Doubles.
Reala - Beat the bronze tournament in Doubles.
Shadow the Hedgehog - Beat the gold tournament in Singles.
Unlock Hidden Courts
Jet Set Radio Court - Beat Level 1 of Jet Set Radio game.
Outrun Court - Beat Level 4 of Sonic the Hedgehog game.
Score Attack Modes
You need to beat all Missions on a mini-game to unlock the respective Score Attack mode.