Ninja Gaiden II: The Ancient Ship Of Doom

Codes

At the title screen, let it fade out to the intro and press Start to go back to the title screen again, repeat this 6 more times (you should have seen the title screen a total of 8 times), at the 8th title screen, press and hold Up, Left, A, B & Select and press Start. If done right, you’ll have 99 continues.

Passwords

Act Passwords (Japanese version)

M – Medicine potion, P – Power-up, R – Ryu, S – Shuriken

Act ISRMP
Act IISMRS
Act IIIPSMR
Act IVMPSR
Act VRSMP
Act VIRRPM
Act VIIMPRS

Game Genie Codes

AEKGVTZA        Start with 1 life

SXXGXAVG        Infinite lives 

SZNGKGSA        Almost invincible! 

LEUOSATA        Half-energy from medicine

GEUOSATE        Double energy from medicine

SXVKLTVG        Stop timer

GXKKUIVA        Never lose Ninja power item 

ZEXGYAPA        Fast running Ryu
SNEKYEVN

LEXGYAPA        Mega-fast running Ryu
KNEKYEVN

IEKGVTZA        Start with 6 lives
SEKKKTSP

AEKGVTZE        Start with 9 lives
SEKKKTSP

IAUONEZA        Half-energy from Blue Ninja power
IAKOOEZA

GPUONEZA        Double energy from Blue Ninja power
GPKOOEZA

GOEPOEZA        Double maximum Ninja power from scroll
ZEOOEAPA

SVOPXXSN        All powers use up only 5 points
SVOOKXSN
SVXOXXSN

XXEOSZVZ       Infinite Ninja power
LOEOVXIY
PUOOSXLK