This page contains Ninja Gaiden Sigma Plus Unlockables for Playstation Vita called "Unlock Ninja Dog difficulty" and has been posted or updated on Apr 15, 2012 by JayJay:). Let us know what you think of this Unlockable by thumbs voting.
Unlock Ninja Dog difficulty
To unlock Ninja Dog difficulty you have to die three times during playing the game under nomal difficulty.
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