Ashtar Ryu costume - Successfully complete Story mode on the Hard difficulty setting to unlock the Ashtar Ryu costume.
Bonus missions - At the Mission mode screen, press Up, Down, Left, Down, Right, Up, Square to unlock the five bonus missions that are include in the Collector's Edition.
Classic Ryuken costume - Successfully complete Story mode on the Normal difficulty setting to unlock the Classic Ryuken costume.
Hard mode - Successfully complete Story mode on the Normal difficulty setting to unlock the Hard difficulty setting.
Master Ninja mode - Successfully complete Story mode on the Very Hard difficulty setting to unlock the Master Ninja difficulty setting.
Mission mode - Successfully complete Story mode on the Normal difficulty setting to unlock Mission mode.
Ninja Dog mode - Intentionally die three times in a row. Answer "Yes" when Ayane asks "Do you really give up the way of Shinobi?" to unlock the Ninja Dog difficulty setting.
Very Hard mode - Successfully complete Story mode on the Hard difficulty setting to unlock the Very Hard difficulty setting.
Items and weapons - Give the indicated number of Golden Scarab to Muramasa at the shop to get the corresponding item or weapon:
Armlet Of Fortune: 40 Golden Scarabs
Armlet Of Potency: 5 Golden Scarabs
Dabilahro: 20 Golden Scarabs
Great Spirit Elixir: 35 Golden Scarabs
Jewel Of The Demon Seal: 45 Golden Scarabs
Life Of Gods: 1 Golden Scarab
Lives Of The Thousand Gods: 10 Golden Scarabs
Plasma Saber MkII: 50 Golden Scarabs
Spirit Of The Devils: 15 Golden Scarabs
The Armlet Of Benediction: 30 Golden Scarabs
The Armlet Of Celerity: 25 Golden Scarabs
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