Unlock Difficulty Settings
Hard, Violent and Beserk mode are unlocked when you have completed the game in the indicated mode.
Unlock Hard Mode:
Complete the game in Normal mode.
Unlock Violent Mode:
Complete the game in Hard mode.
Unlock Beserk Mode:
Complete the game in Violent mode.
More tricks, tips and cheats for this game are right here - The Oneechanpon: The Oneechan 2 Special Edition cheats
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