Ninja Gaiden Black - Platform: XBox

Play Ninja Gaiden:
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Collect all 50 Scarabs and turn them in to the shop to receive the 
Ninja Gaiden cartridge. Take this to Han's Bar and play it on the 
arcade cabinet.

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

Unlock Coming Attractions:
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Play the game for over 1 hour.

Unlock Costumes:
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Comic: Complete the game on Ninja Dog or Normal
Normal: Available at the Beginning
Red Muffler: Complete the game on Hard
DOA: Complete "Special Mission."
Ryuken: Complete the game on Very Hard

Unlock Hard:
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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 Master Ninja:
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Complete the game on Very Hard.

Unlock Mission:
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Complete the game with the difficulty level over Normal.

Unlock Movie Theater:
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Complete the game with any difficulty level.

Unlock New Missions:
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The first 10 Missions will be available from the start. Once you complete 
the first 5, and then 5 more will be unlocked. The rest follow in this 
pattern (five at a time) until all 50 have been unlocked.

Unlock Ninja Dog:
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Die three times consecutively in Chapter 1. Ayane will ask you, 
"Do you really give up the way of Shinobi?" Answer yes to begin Ninja 
Dog Mode.

Unlock Normal:
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Available from the beginning.

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

Unlimited Essence:
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In the Aquaducts, you go down a stone elevator. Afterwards, you meet some 
bugs. Killing them all will get rid of them, but leaving one alive will 
make them respawn when you leave the room. Cycle this room and you can bag 
essence until you're bored or dangerously close to death.

Flee!:
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On the 5th mission, there is an instance where a load of black ninjas appear 
and gang-bang Ryu. Instead of risking losing too much life, start running 
back towards the courtyard outside the monastery. Just as you clear the 
alley's entrance, head back inside and the enemies should be gone and will 
not reappear.