Gladiator Begins (Sony PSP)
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Despair difficulty
Finish game in Nightmare difficulty.
Hard Mode
Beat game on the Normal Difficulty.
Memnon
Clear Despair Mode once.
New Gladiator skins
Beat the game once. Load complete game save. In the character creation(Body type) screen you will find that there are more skins than the default 4 skins.
Nightmare Mode
Beat game on the Hard Difficulty.