Here are some cheats and tips for the game Ninja Gaiden.
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