Ys Unlockables
Nightmare Difficulty Mode
Simply beat the game on any difficulty and Nightmare Mode will be unlocked as a selectable game play mode.
About Ys: The Ark of Napishtim
Ys: The Ark of Napishtim is an action oriented role playing game available for the Sony PSP handheld gaming system. In Japan the game is known as Ys: Napishtim no Hako.
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