The following are known GameShark Codes for HBO Boxing on Sony Playstation (PS1).
These codes were also known as Action Replay Codes and in most cases will work on both devices.

These codes are for the U.S. version of the game.

• Infinite Promoter Points
  D009CB00 0001
  8009CB00 0FFF
• Player 1: Infinite Health
  8008D962 03E7
• Player 1: Quick Knockdown
  8008D962 0000
• Player 2: Infinite Health
  8008DBB6 03E7
• Player 2: Quick Knockdown
  8008DBB6 0000