The following are known Game Genie Codes for Alien 3 on Nintendo Game Boy.

• FA7-68E-4C1
  Almost infinite energy
• 04B-27E-E66
  Start with 4 tries
• 06B-27E-E66
  Start with 6 tries
• 0AB-27E-E66
  Start with 10 tries
• FA6-92E-4C1
  Infinite tries
• 8E4-42D-195
  Start with half energy
• 00F-9CD-E65
  Infinite shots per clip on pick-up
• FAB-45D-4C1
  Infinite magazine clips on pick-up
• 32A-3CA-19A
  50 shots per magazine clip
• 4BA-3CA-19A
  75 shots per magazine clip
• 64A-3CA-19A
  100 shots per magazine clip