Ninja Gaiden (忍者外伝)

Passwords

LEGND

Act 1: Assault

NINJA

Act 2: Smuggling

GIDEN

Act 3: Skyscraper

DRGON

Act 4: Counterattack

SWORD

Act 5

NODIE

Invincibility

HURRY

Unknown effect

MFREE

Infinite Force

LOVER

Pause, press to turn off hits, get Infinite Force

AKUSX

Ending

MONTY

Credits

Access the password screen (US/EU version)

Press x 16 then at the title screen.

Action Replay codes

00C42F89

Infinite Time

See the main page for Ninja Gaiden (忍者外伝)