The following are known Game Genie Codes for Batman: Return of the Joker on Nintendo Entertainment System (NES).

• Protection From Enemy Bullets
  SZXZONSE
• Protection From Collisions
  SZSZKXSE
• Protection From “Electric Grids”
  SXSATXSE
• Start With 1 Life
  AEXILGZA
• Start With 100 Lives
  GVXILGZA
• Each Backpack Energy Capsule Counts As Two
  GAVXVLZA
• Each Backpack Energy Capsule Counts As Four
  AAVXVLZE
• Invincibility Lasts Until Next Stage
  AAKOPIZA
• Start With 7 Backpack Energy Capsules Instead Of None
  GEOSPKVN
• Start Game With 3 Life Increments Instead Of 8
  GEOSTKTA
• Continue Game With 3 Life Increments Instead Of 8
  GASOTOTA
• Infinite Lives
  SZXSZSVK
• Don’t Get Stunned When Hit
  GXEUIOSE
• Stand Your Ground
  AEUUAPGA
  GXKLAOKE
• Intense Knock-Back When Hit
  VNULTONN
  PEUUGPAA
• Game Freezes When You Get A Backpack Energy Capsule
  YAVXULZE
• Darker Colour
  SOTILL
• Softer Music
  NUTAIS
• Where Is Batman?
  OOPSYY
• Batman Can Only Shoot Upwards Until He Manages To Pick Up A Power Weapon
  PILONS
• Changes Colour
  ANZAST
• Start With 9 Lives
  YEXILGZE
• No Damage From Bullets Or Missiles
  GZXZONSE
• No Damage From Objects Or Enemies
  GZSZKXSE
• Invincible In Boss Fights
  SZVUIASE
• Walk Through Enemies And Projectiles After Being Hit Once
  SXEUIOSE
  Note: This does not protect you from spikes.