The following are known GameShark Codes for Grand Slam on Sony Playstation (PS1).

These codes were also known as Action Replay Codes outside the U.S. and later in the U.S. and are compatible with both devices.

• Infinite Balls
  300F6027 0000
• 1 Ball And You Walk
  D00F6026 0000
  800F6027 0003
• 2 Balls And You Walk
  D00F6026 0000
  800F6027 0002
• 3 Balls And You Walk
  D00F6026 0000
  800F6027 0001
• Infinite Strikes
  300F6028 0000
• 1 Strike And You Are Out
  D00F6028 0000
  300F5028 0002
• 2 Strikes And You Are Out
  D00F6028 0000
  300F5028 0001
• Infinite Outs
  300F6029 0000
• 1 Out And You Are Out
  D00F6028 0000
  300F6029 0002
• 2 Outs And You Are Out
  D00F6028 0000
  300F6029 0001
• Away Team Hits Modifier
  800F5C4C ????
• Home Team Hits Modifier
  800F58F4 ????
• Away Team Score Modifier
  800F5C50 ????
• Home Team Score Modifier
  800F58F8 ????
• Run’s Score Modifier
  80050864 00??