Azuma Shinusai can be unlocked by beating the game with all three characters and getting that rank of "grand master" on every level.
This is extreamally hard but definatly worth it. When you manage to complete this you will get nine extra levels along with a new item: the decive ninja.
This is how you ise the decive ninja item. Select the item and hold own triangle. Aim the little red star at the enemy and fire.
An exact double of your character will appear. The enemy will begin attacking the double and there is no way to get the enemy to quit until you hit him.
The bad part: you can only use the decive ninja item once and there is no way to increase the number of decive ninja items.
The only way you can get more is to beat the game again with all characters and get the rank of "grand master" on every level.
The good part: When you do do this again, the new character of Kagami will be useable along with her seven bonus levels.
But when Kagami is used, your game might glitch out and shut down.
More tricks, tips and cheats for this game are right here - Tenchu 2: Birth of the Stealth Assassins cheats
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