You don't have to unlock Devil or True Ogre or Unknown or Tesujin. But you do have to unlock Dark Jun and Dark Jin by getting 15 wins in Survival mode and 13 wins again in Survival. [Easy way]Play someone who sucks and play vs mode and play them and beat them 10 x's with Jin and Jun. [soccer] Get 1st place in Survival mode with Xioayu and Jin.
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