The following are known Game Genie Codes for Super Mario World 2: Yoshi’s Island on Super Nintendo (SNES).

• Infinite Lives
  C2EE-649F
• Star Timer Doesn’t Decrease When Hit
  C23F-ADDD
• Start With 5 Lives
  D9B7-0023
• Start With 10 Lives
  DCB7-0023
• Start With 25 Lives
  FBB7-0023
• Start With 50 Lives
  74B7-0023
• Start With 99 Lives
  17B7-0023
• Continue With 5 Lives
  DC36-010D
• Continue With 10 Lives
  FB36-010D
• Continue With 25 Lives
  7436-010D
• Continue With 50 Lives
  1736-010D
• Continue With 99 Lives
  1736-010D
• All Levels Are Completed With 100 Points
  CB69-006D
  3069-00AD
• Always Score 100 Points
  CB8A-64D5
  108A-6405
  3C8A-6465
• Power-Ups Don’t Get Used Up
  1D26-AFA1
• After Using The Magnifying Glass, Red Coins And Hidden Items Are Always Revealed
  C2C8-A465
• Red !’s Stay On For Over Twice As Long
  D98A-AF7B
• Red !’s Stay On For Over Four Times As Long
  DB8A-AF7B
• Red !’s Stay On For A Very, Very Long Time
  5E8A-AF7B
• No Star Loss
  B93D-AF0D
  Note: Your stars do not decrease when Mario falls off Yoshi’s back.
• New Weapon
  EE82-DD0E
  Note: If you throw an egg straight up while standing still on a level surface, the egg will float in place and any enemy that touches the egg will be destroyed.
• 99 Stars
  B33A-676D
  Note: As long as Mario is on Yoshi’s back, the stars you have will increase to 99. This code makes it very easy to complete the level with 30 stars!
• Start With 255 Lives
  EEB7-0023
• Continue With 255 Lives
  EE36-010D
• Red !’s Stay On For Around 4 Seconds
  DD8A-AF7B
• Red !’s Stay On For Around 10-15 Minutes
  EE8A-AF7B
• Timer Always Goes Up (Doesn’t Add An Extra Points At The End Of The Level)
  DD32-6DAD
• Infinite Lives/Start At Middle Ring (When You Die)
  C2EE-64BF
• Horizontal One-Way Pinball Doors Open From Both Sides
  6DB6-6F55
• Mario Crying Disabled
  44A0-672B