Game shark codes:

Master code "must be on"  
0E3C7DF21853E59E
EE89B636BCBA1D3A 

everything unlocked  
CE7018FEBCA99A82 

Very many people killed  
CE701FA2BCA99A82

Unlimited stamina  
CE3D7086BCA99E6B 

Unlimited yen  
CE701FA6BCA9C292 

Endings complete  
CE70133EBCA99BC2