The following are known Game Genie Codes for Contra III: The Alien Wars on Super Nintendo (SNES).

• Infinite Lives (Side-View Levels)
  22BB-AD01
• Infinite Bombs (Side-View Levels)
  2264-D760
• Infinite Bombs (Top-View Levels)
  22B8-0766
• Infinite Lives (Top-View Levels)
  22BB-6F0B
  6DBB-64DB
• Start With 5 Bombs On Each Life (Side-View Levels)
  D9BB-AFA1
  D9CE-6D0D
• Start With 9 Bombs On Each Life (Side-View Levels)
  DBBB-AFA1
  DBCE-6D0D
• Start With 5 Bombs On Each Life (Top-View Levels)
  D963-6708
  D9CE-6D0F
• Start With 9 Bombs On Each Life (Top-View Levels)
  DB63-6708
  DBCE-6D0F
• Infinite Continues
  C2CA-0F04
• Keep Main Weapon When You Die (Side-View Levels)
  82BA-6FA1
• Keep Main Weapon When You Die (Top-View Levels)
  82BC-646B
• Keep Main Weapon After Continue (Player 1)
  C2C2-64DF
• Keep Main Weapon After Continue (Player 2)
  C2C2-64AF
• Invincible (Top-View Levels)
  8961-6F08
• Player 1 Invincible (Side-View Levels)
  89B3-6F01
  89C0-6D09
• Player 2 Invincible (Side-View Levels)
  89C5-6FD9
  89B6-AFA1
• Stage Select
  **C9-6D6F
• Go To Sound Test Instead of Title Screen
  418A-0F0D
• Can Enable 30 And 99 Lives in Options Screen
  D987-AFA4
• Access Stage Select Screen
  D5C8-64AF
  Note: If you want to change options, turn off the code and go to the Options Menu. You can turn the codes back on and go back to the Stage Select Screen.
• Unlock Stage Select
  3383-0D0D
• Option Screen Modifier
  ??C8-64AF
  Modifers
  • DD: Konami Start Up Logo
  • DF: Blank Screen
  • D4: A.D. 2636 Cutscene
  • D7: Main Menu
  • D0: Demo of CPU Playing Game
  • D9: Sound Check Mode
  • D5: Stage Select
  • D6: Starts 2 Player Game
  • DB: A.D. 2636 Cutscene
  • DC: Stage Clear Level One Then Starts Level 2
  • D8: Gameover Screen If Continue Starts At Level 1
  • DA: Blank Screen Options Hidden But Is Main Menu
  • D2: Options Menu
  • D3: Final Score Screen
  • DE: Blank Screen
  • FD: Explosion Sound Effect
  • F9: Explosion Sound Effect
• Fight Bosses
  33C9-6F6F
  Note: Use this with the Stage Select Code.