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Ninja Dog difficulty:
Intentionally die three times in a row during Chapter 1. Answer "Yes" when Ayane asks "Do you really give up the way of Shinobi?".

Hard difficulty:
Have a completed original Ninja Gaiden saved game file on your hard drive. Alternately, successfully complete the game under the Ninja Dog or normal difficulty settings.

Very hard difficulty:
Have a completed original Ninja Gaiden: Hurricane Pack 2 saved game file on your hard drive. Alternately, successfully complete the game under the hard difficulty setting.

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