The following are known GameShark Codes for Casper 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 Health
  8007F01C 0064
  8007F02C 0064
  801FDD80 0064
• Have the Brass Key
  8007EA28 0001
• Have the Iron Key
  8007EA2C 0001
• Infinite Fools Gold
  8007EA30 FFFF