The following are known Action Replay Codes for Mario is Missing! on Super Nintendo (SNES).

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

• Use Computer To View Pamphlets On Any Artifact
  80B5DF80
  Note: No checks appear on computer.
• Always Get Yoshi After Using Globulator
  80F80101
• Pick Up One Artifact And Get All Three
  80B4FFA9
  80B500FF
  80B501EA
• Talk To Someone Once To Learn All They Know
  80B50CA9
  80B50DFF
  80B50EEA
  Note: All 4 checks appear on computer for that person.
• Use Computer To Access Any Facts Except Pamphlets
  80B60B80
  80B64D00
  80B67800
  Note: No checks appear on computer.