Ninja Gaiden Black Cheats

Unlock Ninja Dog
Die three times consecutively in Chapter 1., then accept the choices given to you.

Unlock Hard
Complete the game on Ninja Dog or Normal difficulty, or have a save file on your hard drive where you completed the original Ninja Gaiden on Xbox.

Unlock Very Hard
Complete the game on Hard difficulty, or have a save file with the clear data of the Hurricane Pack 2

Unlock Master Ninja
Complete the game on Very Hard.

Unlock Movie Theater
Complete the game with any difficulty level.

Unlock Arcade Ninja Gaiden
Complete the game on Ninja Dog or Normal difficulty with the "Ninja Gaiden Arcade" item, or complete the game on Hard.

Unlock Coming Attractions
Play the game for over 1 hour.

Unlock Ayane-themed Start Screen
Load a Ninja Dog save file, and reset the game(start+back)

Unlock all music in "Sound Test"
Complete the game on any difficulty, and you will be able to listen to the game's music from the options menu.

Unlock Mission Mode
Beat the game on any difficulty

More Missions in Mission Mode
Beat five missions to unlock five more

Play Missions on Multiple Difficulties
Beat a mission, and you unlock Hard for that mission. Beat Hard to unlock Very Hard, and Very Hard to unlock Master Ninja. Ninja Dog is not available.

Play Japanese version of Arcade Ninja Gaiden
After unlocking the arcade Ninja Gaiden at the main menu, change both text and speech to Japanese, and you will be able to play the arcade Ninja Gaiden in Japanese.

Kill Rachel and Ayane
In Chapter 2 when Ryu finds Ayane wounded in the 2nd floor of Murasma's shop, shoot her with the bow she gives you. In Chapter 13 when you warp to the grassy plane, you can use the bow to nail Rachel in the distance, killing her. Both of these actions lead to immediate Game Overs, so save before hand.

Scarab Rewards In Ninja Dog (Easy) Mode

Life Of The Gods - 1 Scarab
Armlet Of Potency - 5 Scarabs
Life Of A Thousand Gods - 10 Scarabs
Spirit Of The Devils -15 Scarabs
Dabilahro - 20 Scarabs
Armlet Of Celerity - 25 Scarabs
Armlet Of Benediction - 30 Scarabs
Great Sprit Elixer - 35 Scarabs
Armlet Of Fortune - 40 Scarabs
Jewel of The Demon Seal - 45 Scarabs
Arcade Ninja Gaiden - 50 Scarabs

Scarab Rewards In Hard Mode
Trade in Golden Scarabs for these items.

Technique Scroll - Counter Attacks - 1 Scarab
Technique Scroll - Izuna Drop - 5 Scarabs
Plasma Saber Mk. II - 49 Scarabs
Dark Dragon Blade - 50 Scarabs
Technique Scroll - Guillotine Throw - 10 Scarabs
Windmill Shuriken - 15 Scarabs
Wooden Sword - 20 Scarabs
Dabilahro - 25 Scarabs
Armlet of Celerity - 30 Scarabs
Spear Gun - 35 Scarabs
Armlet of Benediction - 40 Scarabs
Armlet of Fortune - 45 Scarabs

Scarab Rewards In Ninja Dog (Easy) and Normal Mode
Scarabs are traded to muramasa.

Jewel of The Demon Seal - 45 Scarabs
Arcade Ninja Gaiden - 50 Scarabs
Armlet Of Fortune - 40 Scarabs
Great Sprit Elixer - 35 Scarabs
Armlet Of Benediction - 30 Scarabs
Armlet Of Celerity - 25 Scarabs
Dabilahro - 20 Scarabs
Spirit Of The Devils - 15 Scarabs
Life Of A Thousand Gods - 10 Scarabs
Armlet Of Potency - 5 Scarabs
Life Of The Gods - 1 Scarab

Golden Scarab Rewards In Very Hard Mode
Select the "TALK" option at Muramasa's shop to give him Golden Scarabs. He will keep track of how many you have turned in so far and reward you with items based upon your cumulative total.

The Art of the Inferno - 1 Scarab
Spirit of the Devils - 5 Scarabs
The Art of the Ice Storm - 10 Scarabs
Jewel of the Demon Seal -15 Scarabs
Spirit of the Devils - 20 Scarabs
Jewel of the Demon Seal - 25 Scarabs
Armlet of Fortune - 30 Scarabs
Jewel of the Demon Seal -35 Scarabs
The Art of the Inazuma - 40 Scarabs
Spirit of the Devils - 45 Scarabs
Plasma Saber Mk.II - 49 Scarabs
Dark Dragon Blade - 50 Scarabs

Golden Scarab Rewards on Master Ninja Mode
Golden Scarabs can be traded into Muramasa for these items:

Ayane's Rations - 30 scarabs
Ayane's Ration Bundle - 40 scarabs
Dark Dragon Blade - 50 scarabs
Fragrance of Dayflower - 35 scarabs
Fragrance of Hydrangea - 45 scarabs
Elixer of the Devil Way - 15 scarabs
Elixer of Spiritual Life -5 scarabs
Great Devil Elixer - 20 scarabs
Great Spirit Elixer - 10 scarabs
Plasma Saber Mk. II - 49 scarabs
Smoke Bomb - 1 scarab, 25 scarabs

Unlockable Armlets on Hard mode

Armlet of the Sun - Buy it for 5,000 essence
Armlet of the Moon - Buy it for 5,000 essence
Armlet of Potency - Beat clone Ryu in the archives room
Armlet of Celerity - Give Muramasa 25 scarabs
Armlet of Fortune - Give Muramasa 40 scarabs
Armlet of Benediction - Give Muramasa 30 scarabs

Kill Rachel and Ayane
In Chapter 2 when Ryu finds Ayane wounded in the 2nd floor of Murasma's shop, shoot her with the bow she gives you. In Chapter 13 when you warp to the grassy plane, you can use the bow to nail Rachel in the distance, killing her. Both of these actions lead to immediate Game Overs, so save before hand.

Hidden Windmill Shuriken
This secret can be found just outside of Han\'s bar. If you are lucky enough, a hint in the form of a pink Kunai scroll will tell you to look for a special weapon left behind in an alley that "only a Ninja can get to". You can find this "alley" right outside of Han\'s bar to the left. After defeating the ninjas outside, turn to the alleyway and look up. You will see a series of blue strips throughout the alleyway in which you can use to run back and forth about the alley. Do this, starting with the first strip just outside of the alley, and then jump to the second and finally the third strip, all the while running along the wall. Once you hit the last strip, jump to the ledge right across from it. Here you will find the Windmill Shuriken embedded in the wall, and an "X-box" symbol that I believe either revives your KI energy or your life. Once you've taken the shuriken you can continue on with the mission with a new deadly weapon at your side. Good luck. Doesn't work in hard mode.

Play Japanese version of Arcade Ninja Gaiden
After unlocking the arcade Ninja Gaiden at the main menu, change both text and speech to Japanese, and you will be able to play the arcade Ninja Gaiden in Japanese.