The following are known Game Genie Codes for Metal Gear on Nintendo Entertainment System (NES).

• Don’t Take Hits From Bullets
  SZUYPZVG
• No Hits Taken In Hand-To-Hand Fights With Most Enemies
  SXVTXZVG
• Mystery Location 1
  ZASILYPA
• Mystery Location 2
  GASILYPA
• Start With An Energy Boost
  XZVSAYVZ
  PAVSPNTT
  AEKSZYIE
• Start With A Super Energy Boost
  XZVSAYVZ
  PAVSPNTT
  GEKSZYIE
• Sleeping Enemies Won’t Wake Up (Might Not Work)
  AKAAZT
• All Times Are In The Inventory But Cannot Use Them
  AOSZUIEL
• Don’t Start With Cigarettes
  POSZIEL
• Jukebox (Make The First 2 Digits By Yourself)
  ??POZV