To unlock Every thing but not weapons:
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On the main screen of game
Hold L1+L2+R1+R2+UP-LEFT on D-Pad and Rotate left Analog stick to Down-Right.
A voice saying DEVIL MAY CRY indicate that you have unlocked everything.
But you have to Upgrade your weapons.
personally describe you.
Bloody palace mode:
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Complete the game as Dante or use a memory card with a DMC3 save data.
Coatless Dante:
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Complete easy or normal mode.
Coatless Vergil:
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Beat easy with vergil.
Corrupt Vergil:
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Clear the hard level.
DMC1 Dante:
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Complete normal mode.
Easy mode:
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Die 3 times in normal mode.
Hard mode:
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Complete normal mode.
Super Corrupt Vergil:
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Clear VMD.
Super Dante:
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Finish the game on DMD difficulty.
Super Vergil:
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Complete bloody palace.
Vergil mode:
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Complete the game as Dante or use a memory card with a DMC3 save data.
Very hard difficulty:
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You must beat the hard level.