Onimusha 3 - Demon Siege - Platform: Playstation 1

Easy mode:
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"Game Over" twice in normal mode, and easy mode will be unlocked 

Hard mode: 
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Complete the game on normal mode once 

Issen mode: 
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Complete game on hard mode once 

Oni Hard mode: 
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Complete Issen mode once 

Ultimate mode: 
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Complete the shooting mini game 

The three swords from Onimusha 1: 
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Complete all of the phantim realms, finish the game once, 
and start new game. 

Minigames:
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Heihachi Buraiden 
Finish the game once on any difficulty 

Puzzle mini game C
omplete all puzzles in the normal game 

Secret training mode 
Complete normal training mode once and unlock it after 
finishing the game 

Shooting mini game 
Finish game once on 'Normal' difficulty