The following are known GameShark Codes for E.T. Interplanetary Mission 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
  30077234 0063
• Infinite Lives
  30077238 0063
• Max Flowers
  30077538 0063
• Extra Lives
  80028140 0001
• Press L1 For Matrix Mode
  E008F26B 00FB
  8007CEB0 0002
  E008F26B 00F9
  8007CEB0 0002
  Note: GameShark Version 2.2+ Required