The following are known Game Genie Codes for Super Mario Land 3: Wario Land on Nintendo Game Boy.

• 10B 7D8 F7E
  Start with 10 Lives
• 25B 7D8 F7E
  Start with 25 Lives
• 50B 7D8 F7E
  Start with 50 Lives
• 99B 7D8 F7E
  Start with 99 Lives
• 00B 7E8 E6E
  Start as Small Wario
• 02B 7E8 E6E
  Start as Bull Wario
• 03B 7E8 E6E
  Start as Jet Wario
• 04B 7E8 E6E
  Start as Dragon Wario
• FAD 63F 4C1
  Do not lose current power-up when you get hit or get a new power-up
• 10B 7C8 E6A
  Start with 10 Hearts
• 25B 7C8 E6A
  Start with 25 Hearts
• 50B 7C8 E6A
  Start with 50 Hearts
• 99B 7C8 E6A
  Start with 99 Hearts
• 10B 7B8 E6A
  Start with 10 Coins
• 25B 7B8 E6A
  Start with 25 Coins
• 50B 7B8 E6A
  Start with 50 Coins
• 99B 7B8 E6A
  Start with 99 Coins
• 01B 7F8 E6A
  Start on Course 26
• 103 E4F E6E
  Get 10 Hearts for killing an enemy
• 253 E4F E6E
  Get 25 Hearts for killing an enemy
• 503 E4F E6E
  Get 50 Hearts for killing an enemy
• 993 E4F E6E
  Get 99 Hearts for killing an enemy
• 003 AAB E62 + C96 C0C 4C1
  Most enemies and obstacles are invisible