Passwords: Ninja Gaiden

Effect Password
Act I LXAYAX
Act II AXXRYA
Act III XYBRLX
Act IV BRABYY
Act V XAYXLL
Act VI RYRLAX

Passwords: Ninja Gaiden II

Effect Password
Act I AABXYR
Act II XLRBBA
Act III LYBARR
Act IV ALXYYB
Act V RAABXL
Act VI YLRAYR
Act VII BBXYAL

Passwords: Ninja Gaiden III

Effect Password
Act I BYRLXA
Act II ARRYAL
Act III LBRYLY
Act IV RRBAYX
Act V YABXRX
Act VI BXXAXY
Act VII XRXYYL

– Game Genie

> Ninja Gaiden 1

Infinite Time
DD81-1F97

Infinite Lives
C9CF-CFBF

Infinite Energy
C9C3-3F2D

> Ninja Gaiden 2

Infinite Energy
C9BB-441F

Infinite Time
C96F-1FC7

> Ninja Gaiden 3

Infinite Energy
C92A-CFED

Infinite Lives
CB69-CD57