At the main menu, press Up(2), Down(2), Left, Right, Left, Right to unlock all courts. If you entered the code correctly, you will hear a sound.
All gear
At the main menu, press Left, Right, B, Left, Right, B, Up, Down to unlock all gear. If you entered the code correctly, you will hear a sound.
Play as King and Duke
At the main menu, press Up(2), Down(2), Left, Right, LB, RB to unlock King and Duke. If you entered the code correctly, you will hear a sound.
Win one match to win tournament
At the main menu, press B, Left, B, Right, B, Up, B, Down. If you entered the code correctly, you will hear a sound.
Play as Duke
Select Tournament mode and win a Singles match with a "C" or better rank. You will then get challenged by Duke. Defeat Duke to unlock him as a playable character. To easily play against him, set the options to 1 set and 1 game, and the difficulty to Easy. Play a Singles match and do very good by getting A's and B's to get a challenge from Duke.
Play as King
Select Tournament mode and win a Singles match with a "D" or worse rank. You will then get challenged by King. Defeat King to unlock him as a playable character. To easily play against him, set the options to 1 set and 1 game, and the difficulty to Easy. Play a Singles match and do very bad by getting C's and E's to get a challenge from King.
Frying Pan racket
Get three strikes in a row in the Pin Crusher mini-game to unlock the Frying Pan racket.
Guitar racket
Defeat Duke or King in a SPT final to unlock the Guitar racket.
Tambourine racket
Make a total of 100 lob shots to unlock the Tambourine racket.
Wooden racket
Win King Of Players mode to unlock the Wooden racket.
Quick Volley skill increase
In Career mode, play the "Defend The Prize" mini-game repeatedly. Choose one prize and stand in front of it (ignore the others). Simply defend that one prize to easily win the mini-game every time and be able to increase your Volley skill as quickly as desired.
Achievements
Accomplish the indicated achievement to get the corresponding number of Gamerscore points:
Custom Player Created (10 points): Create your own Custom Player.
World Tour Match (10 points): Win your first match in the World Tour.
World Tour Tournament (10 points): Win your first tournament in the World Tour.
World Tour Season (20 points): Complete Year 1 in the World Tour.
Rank #200 World Tour (10 points): Rank #200 in the World Tour.
Training Games Cleared (10 points): Clear each type of mini-game in the World Tour.
Level 6 Training Game Cleared (30 points): Clear a level 6 mini-game in the World Tour.
Academy Missions Cleared (10 points): Clear each type of academy training session in the World Tour.
Gold in all Academy (30 points): Clear all the academy mission with gold medals.
R&R (10 points): Take a well deserved rest in the World Tour.
25 Conversations (10 points): Make friends and chat to 25 pro players in the World Tour.
All Stages Unlocked (30 points): Unlock every stage in the game.
Looking Good (20 points): Unlock 1 of each type of gear.
Unlocked King (30 points): Unlock secret player King.
Unlocked Duke (30 points): Unlock secret player Duke.
25 Court Games Played (20 points): Play and complete 25 Court Games.
Won Using All Male Pro Players (20 points): Win a match with all Male Pro Players on default settings.
Won Using All Female Pro Players (20 points): Win a match with all Female Pro Players on default settings.
1st Custom Player Win (20 points): Win a match with an Custom Player on default settings.
Beat All Male Pro Players (20 points): Beat all Male Pro Players on default settings.
Beat All Female Pro Players (20 points): Beat all Female Pro Players on default settings.
1000 Plays (30 points): Play the game 1000 times in any mode.