The following are known Game Genie Codes for Vampire: Master of Darkness on SEGA Game Gear.

• Infinite Time
  00B 3AB E6E
• Start With 2 Lives
  022 727 E66
• Start With 7 Lives
  072 727 E66
• Start With 9 Lives
  092 727 E66
• Infinite Energy
  3A7 02B 2A2
  Note: If you get stuck, switch this code off.
• Infinite Lives
  3A1 2AE 2A2
• Infinite Ammo For Special Weapons
  3A3 23D 2A2
• Die And Get Special Weapons Given To You
  3C1 32E 5D4
• Don’t Lose Special Weapons After Dying
  211 36E 2A2
  211 39E 2A2
• Invincibility
  3E6 FFB 2AA
  207 00B E6E
  007 01B 5D4