The following are known GameShark Codes for Hard Hitter Tennis on Sony Playstation 2 (PS2).

• Master Code – Must Be On
  0E3C7DF2 1853E59E
  EE8BDB8E BCD393EA
• Max Score-Shooting
  CEA5C792 BCA99A82
• Press “Select” For More Balls – Shooting
  0EAD8CF8 BCA99A81
  CEA5C79E BCA99B8D
• Max Score – Alphabet
  CEA5ECEA BCA99A82
• Press “Select” For More Balls – Alphabet
  0EAD8CF8 BCA99A81
  CEA5EFF6 BCA99BA3
• Player 1: 0 Points – Alphabet
  CEA73796 BCA99B83
  CEA7379E BCA99B83
• Player 1: 7 Points – Alphabet
  CEA73796 BCA99B8A
  CEA7379E BCA99B8A
• Player 2: 0 Points – Alphabet
  CEA73792 BCA99B83
  CEA7379A BCA99B83
• Player 2: 7 Points – Alphabet
  CEA73792 BCA99B8A
  CEA7379A BCA99B8A