The following are known Game Genie Codes for Gradius III on Super Nintendo Entertainment System (SNES).

• Start With 1 Life Instead Of 3
  DD8B-6DA4
• Start With 2 Lives
  DF8B-6DA4
• Start With 4 Lives
  D78B-6DA4
• Start With 5 Lives
  D08B-6DA4
• Start With 9 Lives
  D68B-6DA4
• Start With 16 Lives
  DE8B-6DA4
• Start With 31 Lives
  F38B-6DA4
• Infinite Lives
  3C8E-DDD7
  3C8E-DD07
• Start With 1 Credit Instead Of 4 (Use For 1-Player Game Only)
  DFC3-DF0D
• Start With 2 Credits
  D4C3-DF0D
• Start With 6 Credits
  D1C3-DF0D
• Start With 7 Credits
  D5C3-DF0D
• Start With 8 Credits
  D6C3-DF0D
• Start With 9 Credits
  DBC3-DF0D
• Infinite Credits
  C227-6DDD
• Makes Earwig Scorpion (Stage 1 Mayor) Much Easier To Defeat
  DFBB-A766
• Makes Bubble Brain (Stage 2 Mayor) Dasier To Defeat
  DFB1-6F6C
• Weapons Status Gauge Remains At Current Level After A Weapon Is Selected
  3C29-0704
  3C29-0764
• Enemies Shoot At You More
  CBAF-D7AD
  DFA4-DDDD
• Infinite Konami Code Use
  C2A9-0DDD
  Note: Now you can use it with every life. Pause the game then press Up, Up, Down, Down, L, R, L, R, B, A, then Start, for a full power-up.
• Starting Weapon Modifier
  ??8C-67D4
• Infinite Mega-Crush Until You Get Another Orb
  C929-0704
• Invincibility
  6D2D-D464
• Enable Arcade Option
  D78F-D4AF

Konami Powerup Code Modifiers

• Main Weapon
  ??A9-040D
  Modifiers
  • D4: Double
  • D7: Tailgun
  • D0: Back Double
  • D9: Vertical
  • D1: Twin Laser
  • D5: Laser
  • D6: Twin Laser
  • DB: Charged Laser
  • DC: Laser
• Missiles For Ship Configuration 1
  ??C8-A4A0
  Modifiers
  • D8: Missile
  • DA: Spread Bomb
  • D2: 2-Way Missile
  • D3: Name?
  • DE: Name?
• Missiles For Ship Configuration 2
  ??CA-ADA0
  Note: Same modifiers as “Missiles For Ship Configuration 1”.
• Missiles For Ship Configuration 3
  ??CA-A4A0
  Note: Same modifiers as “Missiles For Ship Configuration 1”.
• Missiles For Ship Configuration 4
  ??C2-ADA0
  Note: Same modifiers as “Missiles For Ship Configuration 1”.
• Speed Level
  ??A9-0FDD
  Modifiers
  • DF: Level 1
  • D4: Level 2
  • D7: Level 3
  • D0: Level 4