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

• SZETPGVG
  Infinite Lives
• AAUVLIZE
  Start with 9 Lives
• IAUVLIZA
  Start with 6 Lives
• AAUVLIZA
  Start with 1 Life
• AEXVVYIA
  Use Windmill Throwing-Star without losing Spiritual Strength
• AAETUYIA
  Use Fire-Wheel without losing Spiritual Strength
• AAVTNYLA
  Use Shuriken without losing Spiritual Strength
• APEIKGTA
  Maximum Strength regained from Restorer