The following are known GameShark Codes for Gex 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.

• Joker Command
  D009823C ????
• Infinite Lives
  8009732C 0063
• Invincible
  80097BD8 0001
• Infinite Gold Flies
  80097AF8 0063
• Blurr Mode
  80097CCC 0001
• Fireball Mode
  80097BD6 0001
• Moon Jump
  D009823C 0400
  800D752A FFFB