The following are known Game Genie Codes for Felix the Cat on Nintendo Entertainment System (NES).

• Start With 9 Lives
  APUGAGZO
• Start With 6 Lives
  IPUGAGZP
• Start With 1 Life
  APUGAGZP
• Infinite Lives
  AEUYKPPA
• Hearts Can’t Be Replenished From Bottles
  AAEENAZA
• Bottles Replenish More Hearts
  GAEENAZA
• Bottles Replenish Even More Hearts
  AAEENAZE
• Never Lose Current Weapon
  GZUKOSVK
  Note: Gives you invincibility and lets you keep your current weapon unless you fall off the screen.
• Pick Up 1 Head And Get 2!
  ZAOSOZPA
  APNSOXPO