The following are known Game Genie Codes for Ninja Gaiden Trilogy on Super Nintendo (SNES).

Ninja Gaiden Codes
• Start With Very Little Energy (After First Life)
  DFCE-142F
• Start With About Half Energy (After First Life)
  DFCE-142F
• Infinite Time
  DD81-1F97
• Start With Very Little Time
  B1C8-3DF8
• Start With Lots Of Time
  EEC8-3DF8
• Start With 1 Life
  DDC5-4DF4
• Start With 5 Lives
  D7C5-4DF4
• Start With 9 Lives
  D6C5-4DF4
• Infinite Lives
  C9CF-CFBF
• Infinite Energy
  C9C3-3F2D
• Untouchable
  6DC8-3DFD
  48C8-3D9D
  2EC3-3DBD
• Stage Select
  ??C9-4794
  69C1-4DF4
  Note: Use DF-F9. The only visible side effect is that it gives you a red background where your status bar is.

Ninja Gaiden II: The Dark Sword of Chaos

• Start With Very Little Energy
  DFB3-144F
• Start With About Half Energy
  D6B3-144F
• Infinite Energy
  C9BB-441F
• Infinite Time
  C96F-1FC7
• Throwing Stars Don’t Use Energy (Ignore Counter)
  DFC4-1F47
• Start With 1 Life
  DDB3-C4CF
• Start Every Life With 2 Shadow Ninjas
  DEB9-14C4
• Untouchable
  1DB4-CD4D

Ninja Gaiden III: The Ancient Ship of Doom

• Start With 1 Life
  DD6B-CF87
• Start With 5 Lives
  D76B-CF87
• Start With 9 Lives
  D66B-CF87
• Start With Very Little Energy
  DF68-CD77
• Start With About Half Energy
  D668-CD77
• Infinite Energy
  C92A-CFED
• Infinite Lives
  CB69-CD57
• Almost Infinite Ninja Power
  C9A7-C757
• Start Each Life With A Mega-Sword
  5E68-C477
  5E68-C777
  Note: Do not collect Sword Upgrades as it is negate the effect of this code.
• Start Each Life With Sword Upgrade
  DF68-CF77
  F668-C477
  FD68-C777
• Untouchable
  DDAB-3FE7
• Start With 99 Weapon Points (Ignore The Counter)
  176C-CDE7
• Stage Select
  ??6B-CF87
  FD6B-CFE7
  Note: Use DF-4E to select the Stages.